dwr入门

[size=small]dwr配置:
1. 需要在web.xml文件里面加上dwr的过滤器

<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>
	</servlet>
	<servlet-mapping>
		<servlet-name>dwr-invoker</servlet-name>
		<url-pattern>/dwr/*</url-pattern>
	</servlet-mapping>

2. 下面把dwr.jar放到lib中去,dwr.jar可以从网上下到.google一下就可以,另外也需要把commons-logging.jar加到lib中,这是个日志包,具体的应用可以去看看这篇文章:http://lincoln.iteye.com/blog/32535

3. 写个类Test:

public class Test {
	public String prt(String name){
		return "hello" + name;
	}
}

4. 然后在web-inf文件夹下添加dwr-xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.ltd.uk/dwr/dwr20.dtd">
<dwr>
	<allow>
		<create javascript="dwr" creator="new">
			<param name="class" value="Test"></param>
		</create>
	</allow>
</dwr>

5. 将项目部署下,然后登陆http://localhost:8080/你的项目名/dwr,点击dwr (Test) ,进入Methods For: dwr (Test)的主页面,将下面的3个<script>复制到index.jsp上

<script type='text/javascript' src='/项目名/dwr/interface/dwr.js'></script>
		<script type='text/javascript' src='/项目名/dwr/engine.js'></script>
		<script type='text/javascript' src='/项目名/dwr/util.js'></script>

6. javascript代码:

function a(){
    		var inp = document.getElementById("inp").value;
    		dwr.prt(inp,callback);
    	}
    	function callback(msg){
    		document.getElementById("di").innerHTML = msg;
    	}

7. 页面部分:

<input id="inp">
		</br>
		<input onclick="a();" value="submit" type="button">
		<div id="di"></div>

这样,一个最简单的dwr的helloworld程序就完成了.