dwr实现服务器推送信息

来源：互联网发布：淘宝第五大道是真是假编辑：程序博客网时间：2024/04/27 23:43

一个简单的dwr推送程序

1、将dwr相关的jar包导入到工程

commons-logging-1.1.1.jar

dwr.jar

2、web.xml配置

<?xml version="1.0" encoding="UTF-8"?><web-app id="WebApp_ID" version="2.4"xmlns="http://java.sun.com/xml/ns/j2ee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"><!-- 以设置下格式固定，可复制使用 --><display-name>ajaxDWR</display-name><servlet><servlet-name>dwr-invoker</servlet-name><!-- <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class> --><servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class><init-param><!-- 实现调试，在release请设置为false --><description></description><param-name>debug</param-name><param-value>true</param-value></init-param><init-param><param-name>activeReverseAjaxEnabled</param-name><param-value>true</param-value></init-param><init-param><param-name>crossDomainSessionSecurity</param-name><param-value>false</param-value></init-param><init-param><param-name>allowScriptTagRemoting</param-name><param-value>true</param-value></init-param><init-param>            <param-name>pollAndCometEnabled</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></web-app>

3、dwr.xml配置

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE dwr PUBLIC    "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"    "http://getahead.org/dwr/dwr30.dtd"><dwr>    <!-- 对后台类的配置格式确定 --><allow><!-- Hello为类名，ajax.lusm.Hello为类的真实地址 --><create creator="new" javascript="service"><param name="class" value="helloWorld.Service" /></create></allow></dwr>

4、编写暴露的接口

public class Service {public String sayHello(String youName){return "HelloWorld" + youName;}

5、jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>DWR CASE</title><!-- 这两个是必须的，来自官方，路径的写法为相对路径,且开始第一个字符不为"/" --><script type='text/javascript' src='dwr/util.js'></script><script type='text/javascript' src='dwr/engine.js'></script><!-- 这个文件不存在，当必须设定Hello.js的名称为后台类名，且路径一定是dwr/interface/类名.js --><script type='text/javascript' src='dwr/interface/service.js'></script><!-- 这个是我们用户自己的定义的js，真实存在，存放我们自己写的js的代码，dwr2.0该代码有时候只有放当前目录下，程序才能正确运行 --><!-- <script type="text/javascript" src='hello.js'></script> --><script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script><script type="text/javascript">$(document).ready(function(){dwr.engine.setActiveReverseAjax(true);$("#sendt").click(function(){service.sayHello($("#input").val(), callback);})});function callback(data) {//alert(data);//DWRUtil.setValue("test", data);$("#test").html(data);}</script></head><body>大名2：<input id="input" type="text" /><!-- <input type='button' value='运行' onclick='hello();' /> --><input type='button' value='运行' id="sendt" /><p><font color="red"><div id="test"></div></font></body></html>

6、js文件

function hello() {var input = DWRUtil.getValue("input");service.sayHello(input, callback);}function callback(data) {//alert(data);DWRUtil.setValue("test", data);}

7、项目下载

链接：http://pan.baidu.com/s/1cIgHxc 密码：cp2w

0 0