用Spring3编写第一个HelloWorld项目

浅浅的花香味﹌ 2022-03-29 04:22 241阅读 0赞

## [第一个HelloWorld程序][HelloWorld] ##

让我们用Spring来写第一个应用程序吧。

完成这一章要求：

*  熟悉Java语言
 *  设置好Spring的环境
 *  熟悉简单的Eclipse IDE的操作

如果你还没有设置好环境，请参考[Spring开发环境的配置][Spring]。

我们第一个程序是打印”Hello World”语句，这个语句通过Spring的配置文件来设置。

## 1 – 新建Java项目： ##

第一步用Eclipse IDE新建一个项目。 点击 `> File > New > Java Project`。然后在弹出的对话框中输入项目的名称，我们就叫`HelloWorld`吧。这会在你的workspace下新建一个HelloWorld的目录作为项目的根目录。

![新建Java项目][Java]

点击`Finish`。你会在`Project Explorer`视图看到新建的项目。如果`Project Explorer`没有打开，请在`> Window > Show View`中找到。

![Project Explorer视图][Project Explorer]

## 2 – 添加Spring库 ##

接下来要加入必要的Spring库添加到CLASSPATH下，以便Eclipse编译和运行程序时能够找到所需要的class。

右键在`Package Explorer`中点击`> Build Path > Configure Build Path...`。然后点击`Add External JARs...`加入我们需要的Spring库。如果还没有下载Spring库，请先[下载Spring库][Spring 1]。

我们需要加入的Spring库有：

*  org.springframework.aop-3.2.2
 *  org.springframework.aspects-3.2.2
 *  org.springframework.beans-3.2.2
 *  org.springframework.context-3.2.2
 *  org.springframework.context.support-3.2.2
 *  org.springframework.core-3.2.2
 *  org.springframework.expression-3.2.2

此外，为了打印信息，我们还需要一个Apache Commons Logging API，在这里[下载commons-logging-1.1.x][commons-logging-1.1.x]。本教程写作的时候，最新版是commons-logging-1.1.2。下载后解压缩到任意目录，我解压到`~/commons-logging-1.1.2`。

然后和添加Spring库一样添加commons-logging-1.1.2.jar到CLASSPATH中。

![添加Spring库][Spring 2]

## 3 – Java源代码 ##

首先新建一个包“com.ladyloveit”。右键点击src，然后`> New > Package`，新建`com.ladyloveit`包。

![添加包][HelloWorld-4.png]

然后我们需要在`com.ladyloveit`包下新建两个Java源文件`HelloWorld.java`和`MainApp.java`。

HelloWorld.java:

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      1 
    </div> 
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      2 
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      3 
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      4 
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      5 
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      6 
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      7 
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      8 
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      9 
    </div> 
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      10 
    </div> 
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      11 
    </div> 
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      12 
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    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      13 
    </div> 
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      14 
    </div> 
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      15 
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      16 
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      17 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      18 
    </div> </td> 
   <td style="border:0px;width:604px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
    <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">package</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">com.ladyloveit;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">public</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">class</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">HelloWorld { </code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
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     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">private</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">String message;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
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      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">public</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">void</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">setMessage(String message){ </code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">this</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">.message&nbsp; = message;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">}</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">public</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">String getMessage(){ </code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">return</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">this</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">.message;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">}</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">public</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">void</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">printMessage(){ </code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">System.out.println(</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"Your Message : "</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">+ message);</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">}</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">}</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

MainApp.java:

<table style="border:0px;width:658px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-collapse:separate;border-spacing:0px;background-image:none;"> 
 <tbody style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
  <tr style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
   <td style="border:0px;text-align:left;color:#afafaf;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      1 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      2 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      3 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      4 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      5 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      6 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      7 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      8 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      9 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      10 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      11 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      12 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      13 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      14 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      15 
    </div> </td> 
   <td style="border:0px;width:621px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
    <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">package</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">com.ladyloveit;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">import</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">org.springframework.context.ApplicationContext;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">import</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">org.springframework.context.support.ClassPathXmlApplicationContext;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">public</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">class</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">MainApp { </code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">public</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">static</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">void</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">main(String[] args) { </code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">ApplicationContext context = </code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">new</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">ClassPathXmlApplicationContext(</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"Beans.xml"</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">);</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">HelloWorld obj = (HelloWorld) context.getBean(</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"helloWorld"</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">);</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">obj.printMessage();</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">}</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">}</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

## 4 – 配置文件 ##

接下来，我们需要新建一个XML文件来配置bean，这个XML的作用是集中在一个地方，配置和管理所有的bean。有关bean的概念，请看[Bean的定义][Bean]。

我们将这个XML文件也放在`src`下面，这样就保证Eclipse可以在CLASSPATH下读取到这个文件。

新建一个`Beans.xml`，当然这个文件名任意，不过要和MainApp.java中`ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml")`设置的一致。

Beans.xml

<table style="border:0px;width:641px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-collapse:separate;border-spacing:0px;background-image:none;"> 
 <tbody style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
  <tr style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
   <td style="border:0px;text-align:left;color:#afafaf;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      1 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      2 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      3 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      4 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      5 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      6 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      7 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      8 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      9 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      10 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      11 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      12 
    </div> 
    <div style="border-width:0px 3px 0px 0px;text-align:right;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;border-right-color:#6ce26c;border-right-style:solid;background-image:none;">
      13 
    </div> </td> 
   <td style="border:0px;width:604px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
    <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&lt;?</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">xml</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">version</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"1.0"</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">encoding</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"UTF-8"</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">?&gt;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&lt;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">beans</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">xmlns</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"<a style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;text-decoration:none;vertical-align:baseline;background-image:none;" href="http://www.springframework.org/schema/beans" rel="nofollow">http://www.springframework.org/schema/beans</a>"</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">xmlns:xsi</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"<a style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;text-decoration:none;vertical-align:baseline;background-image:none;" href="http://www.w3.org/2001/XMLSchema-instance" rel="nofollow">http://www.w3.org/2001/XMLSchema-instance</a>"</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">xsi:schemaLocation="<a style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;text-decoration:none;vertical-align:baseline;background-image:none;" href="http://www.springframework.org/schema/beans" rel="nofollow">http://www.springframework.org/schema/beans</a></code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"><a style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;text-decoration:none;vertical-align:baseline;background-image:none;" href="http://www.springframework.org/schema/beans/spring-beans-3.0.xsd" rel="nofollow">http://www.springframework.org/schema/beans/spring-beans-3.0.xsd</a>"&gt;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&lt;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">bean</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">id</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"helloWorld"</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">class</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"com.ladyloveit.HelloWorld"</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&gt;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&lt;</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">property</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">name</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"message"</code> 
      <code style="border:0px;text-align:left;color:#808080;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">value</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">=</code> 
      <code style="border:0px;text-align:left;color:#0000FF;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">"Hello World!"</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">/&gt;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&nbsp;&nbsp;&nbsp;</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&lt;/</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">bean</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&gt;</code> 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">
       &nbsp; 
     </div> 
     <div style="border:0px;text-align:left;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;"> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&lt;/</code> 
      <code style="border:0px;text-align:left;color:#006699;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:bold;vertical-align:baseline;background-image:none;">beans</code> 
      <code style="border:0px;text-align:left;color:#000000;line-height:1.1em;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;font-style:normal;font-weight:normal;vertical-align:baseline;background-image:none;">&gt;</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

这个Beans.xml文件中设置了bean，包含在`<beans>`和`</beans>`中。每个bean都有一个唯一的id。

这个语句为`message`变量赋值，这样就能打印出`Hello World!`了。要修改输出，只需要修改XML文件，而不需要修改MainApp.java和HelloWorld.java。

## 5 – 运行程序 ##

当你完成了以上的步骤，我们便可以运行程序了。

右键MainApp.java，点击`> Run As > Java Application`。也可以在工具栏找到运行按钮。

如果一切正常，输出如下：

## 回顾运作流程 ##

1.  首先会运行main()语句，Spring框架使用`ClassPathXmlApplicationContext()`首先创建一个容器。
2.  这个容器从`Beans.xml`中读取配置信息，并根据配置信息来创建bean(也就是对象)，每个bean有唯一的id。
3.  然后通过`context.getBean()`找到这个id的bean，获取对象的引用。
4.  通过对象的引用调用`printMessage()`方法来打印信息。

好了，这是你的第一个Spring应用。你已经学会用Eclipse新建Java项目，导入Spring和commons-logging库，编写Java源代码和XML配置文件，并且成功运行了。如果要更改输出，只需要修改XML文件中的value值，而不需要更改Java源文件。

[HelloWorld]: http://www.ladyloveit.com/spring/first-helloworld-program/
[Spring]: http://www.ladyloveit.com/spring/spring-development-environment-configuration/
[Java]: http://www.ladyloveit.com/wp-content/uploads/2013/05/HelloWorld-1.png
[Project Explorer]: http://www.ladyloveit.com/wp-content/uploads/2013/05/HelloWorld-2.png
[Spring 1]: http://www.ladyloveit.com/spring/spring-development-environment-configuration/#spring
[commons-logging-1.1.x]: http://commons.apache.org/proper/commons-logging/download_logging.cgi
[Spring 2]: http://www.ladyloveit.com/wp-content/uploads/2013/05/HelloWorld-3.png
[HelloWorld-4.png]: http://www.ladyloveit.com/wp-content/uploads/2013/05/HelloWorld-4.png
[Bean]: http://www.ladyloveit.com/spring/spring-bean-definition/