9、dwr的入门教程

迈不过友情╰ 2022-07-24 05:19 150阅读 0赞

1、下载 DWR 的 JAR 文件

[ 下载][Link 1] dwr.jar 文件,放在WEB-INF/lib的目录下.

2、下载Commons Logging 的 JAR 文件

DWR依赖于Commons Logging. [ 下载][Link 2] commons-logging.jar 并且放在WEB-INF/lib的目录下.

3、在项目的,web.xml 文件里面 增加 DWR 默认的 servlet

<servlet>
    		<servlet-name>dwr-invoker</servlet-name>
    		<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
    		<init-param>
    			<param-name>debug</param-name>
    			<param-value>true</param-value>
    		</init-param>
    		<load-on-startup>1</load-on-startup>
    	</servlet>
    	<servlet-mapping>
    		<servlet-name>dwr-invoker</servlet-name>
    		<url-pattern>/dwr/*</url-pattern>
    	</servlet-mapping>

4、创建一个DWR的配置文件( dwr.xml )

在应用的WEB-INF/lib的目录下创建一个新的xml文件,叫 [ dwr.xml][dwr.xml]

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE dwr PUBLIC
        "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"
        "http://directwebremoting.org/schema/dwr30.dtd">
    <dwr>
    	<allow>
    		<create creator="new">
    			
    			<param name="class" value="com.baowei.dwr.HelloDwr"></param>
    		</create>
    	</allow>
    </dwr>

5、在页面中加入DWR的文件

6、关于HelloDwr.java如下

public class HelloDwr {
    
    	public String sayHello(String name) {
    		System.out.println("hello " + name);
    		return "Hello " + name;
    	}
    
    }

7、关于文件,dwr的jsp页面如下

<script type='' src='dwr/engine.js'></script>
    
    <script type='text/javascript' src='dwr/interface/HelloDwr.js'></script>
    <script type="text/javascript">
    	HelloDwr.sayHello("dwr", function(data) {
    		alert(data);
    	});
    </script>

[Link 1]: http://directwebremoting.org/dwr/downloads/index.html
[Link 2]: http://commons.apache.org/proper/commons-logging/download_logging.cgi
[dwr.xml]: http://directwebremoting.org/dwr/documentation/server/configuration/dwrxml/index.html