SpringMVC 2.HelloWorld

缺乏、安全感 2022-05-27 11:24 224阅读 0赞

<table> 
 <tbody> 
  <tr> 
   <td><font> &nbsp;面向对象面向君，不负代码不负卿。 *^o^* </font> </td> 
  </tr> 
 </tbody> 
</table>

# SpringMVC HelloWorld #

--------------------

## 1.建立SpringMVC的Maven工程 ##

#### 1.1 使用iIntelliJ IDEA 创建Maven工程 ####

![创建Maven工程][Maven]  
![选择][70]  
![继续][70 1]  
![继续][70 2]  
![完成][70 3]

### 1.2 配置pom.xml ###

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>com.ifox.hgx</groupId>
      <artifactId>springMVC_1</artifactId>
      <packaging>war</packaging>
      <version>1.0-SNAPSHOT</version>
      <name>springMVC_1 Maven Webapp</name>
      <url>http://maven.apache.org</url>
    
      <dependencies>
    
        
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>5.0.3.RELEASE</version>
        </dependency>
    
        
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.1.0</version>
          <scope>provided</scope>
        </dependency>
    
      </dependencies>
      <build>
        <finalName>springMVC_1</finalName>
      </build>
    </project>

## 2 HelloWorld实现 ##

### 2.1 目录结构预览 ###

![目录结构][70 4]

### 2.2 配置web.xml ###

*  配置 `DispatcherServlet` ：`DispatcherServlet` 默认加载 /WEBINF/.xml的 Spring 配置文件, 启动 WEB 层的 Spring 容器。可以通过 `contextConfigLocation` 初始化参数自定义配置文件的位置和名称

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
    
        <servlet>
            <servlet-name>springDispatcherServlet</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            
            
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:springmvc.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>springDispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
    </web-app>

### 2.3 创建 SpringMVC 配置文件: springmvc.xml ###

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">  <context:component-scan base-package="com.ifox"></context:component-scan>  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>

### 2.4 创建请求处理器类：HelloWorld .java ###

package com.ifox.handlers;
    
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    @Controller
    public class HelloWorld { 
        /* 1.使用@RequestMapping 注解来映射请求的URL 2.返回值会通过视图解析器解析未实际的物理视图，对于InternalResourceViewResolver 视图解析器，会做如下的解析:通过prefix + returnVal + 后缀 得到实际的物理视图，然后做转发操作 如: /WEB-INF/views/success.jsp */
    
        @RequestMapping("/helloworld")
        public String hello(){
            System.out.println("hello world");
            return "success" ;
        }
    }

### 2.5 视图实现 ###

#### 2.5.1 index.jsp ####

<html>
    <body>
        <h2>Hello World!</h2>
        <a href="helloworld">hello world</a>
    </body>
    </html>

#### 2.5.2 success.jsp ####

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <h4>success page</h4>
    </body>
    </html>

## 3 流程分析 ##

![如图][70 5]

[上一篇:SpringMVC 1.概述][SpringMVC 1.]

[下一篇:SpringMVC 3.RequestMapping，@PathVariable注解，REST][SpringMVC 3.RequestMapping_PathVariable_REST]

<table> 
 <tbody> 
  <tr> 
   <td><font> &nbsp;&nbsp;&nbsp;大牛，别默默看了。快登陆帮我评论吧！ *^o^* </font> </td> 
  </tr> 
 </tbody> 
</table>

[Maven]: /images/20220527/7b76c8189dcf40ae9a7f3a94b3051e38.png
[70]: /images/20220527/910abc166e434e078c224c68e3078477.png
[70 1]: /images/20220527/ff524a42b0cd466ab7d72b04c14c440c.png
[70 2]: /images/20220527/b73b5f8db2204784835d554953f35cf5.png
[70 3]: /images/20220527/bd8b01afbd86453fb0cedc2e90b909ff.png
[70 4]: /images/20220527/d1fda5c289e74d4f9a809dbaf2b0a2f3.png
[70 5]: /images/20220527/0c7b49fe23034d61a3f46dc39259e8d9.png
[SpringMVC 1.]: https://blog.csdn.net/hgx_suiyuesusu/article/details/79979566
[SpringMVC 3.RequestMapping_PathVariable_REST]: https://blog.csdn.net/hgx_suiyuesusu/article/details/79981124