想做一个web推送相关的东东，昨天搞了一天，终于把这些杂乱的配制弄清了，今天写出来方便以后记住，也方便大家看一下吧
1：引入dwr包，我用的是maven
<dependency> <groupId>org.directwebremoting</groupId> <artifactId>dwr</artifactId> <version>3.0.M1</version></dependency>
2：配制web.xml
我是在sPRingMVC下进行的
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name>SmallSP Web application</display-name> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <listener> <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:mvc/springMVC.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>default</servlet-name> <url-pattern>*.js</url-pattern> </servlet-mapping> <filter> <filter-name>Set Encoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf8</param-value> </init-param> </filter> <filter-mapping> <filter-name>Set Encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>
以上代码中添加的是以下这一段
<servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping><servlet-mapping>
3：配制springMVC.xml
在原有springMVC配制中添加以下
<dwr:configuration /> <dwr:annotation-config id="dwr" /> <!-- 要求DWR将util.js和engine.js映射到dwrController --> <dwr:url-mapping /> <!-- 定义dwr --> <dwr:controller id="dwrController" debug="true"> <dwr:config-param name="allowScriptTagRemoting" value="true" /> <dwr:config-param name="crossDomainsessionSecurity" value="false" /> <dwr:config-param name="pollAndCometEnabled " value="true"/> <dwr:config-param name="activeReverseAjaxEnabled" value="true"/> <dwr:config-param name="debug " value="true"/> </dwr:controller>
4：配制RemoteProxy
@Controller@RemoteProxy(name = "directController") public class MyDwrController { @RemoteMethod public String ShowHello(){ return "hello"; } @RemoteMethod public void send(HttpServletRequest request,String msg){ ServletContext sc = request.getSession().getServletContext(); ServerContext sctx = ServerContextFactory.get(sc); //获得当前浏览 index.jsp 页面的所有脚本session Collection<ScriptSession> sessions = sctx.getScriptSessionsByPage("/show"); Util util = new Util(sessions); ScriptBuffer sb = new ScriptBuffer(); sb.appendScript("show("); sb.appendData(msg); sb.appendScript(")"); //推送 util.addScript(sb); //util.addFunctionCall("show", ": " + msg); //dwrtest为Javascript函数 } }5：发送页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>123</title><script type='text/javascript' src='/static/jquery-min.js'></script> <script type='text/javascript' src='<c:url value="/dwr/engine.js"/>'></script> <script type='text/javascript' src='<c:url value="/dwr/util.js" />'></script> <script type='text/javascript' src='<c:url value="/dwr/interface/directController.js" />'></script> <script type="text/javascript"> function view() { directController.ShowHello(function(data) { alert(data); }); } function send(){ dwr.engine.setActiveReverseAjax(true); directController.send($("#msg").val()); } </script> </head><body> <input type="text" id="msg" /> <input type="button" value="发送" id="but" onclick="send();" /> </body></html>6：接收页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><script type='text/javascript' src='/static/jquery-min.js'></script> <script type='text/javascript' src='<c:url value="/dwr/engine.js"/>'></script> <script type='text/javascript' src='<c:url value="/dwr/util.js" />'></script> <%-- <script type='text/javascript' src='<c:url value="/dwr/interface/directController.js" />'></script> --%> <script type="text/javascript"> $(function(){ //这句话千万不能少 ，表示允许使用推送技术 dwr.engine.setActiveReverseAjax(true); }); //这个函数是提供给后台推送的时候 调用的 function show(msg){ $("#message").text(msg); } </script> </head><body><div id="message" style="width: 200px;height: 200px;border: 1px solid red ; text-align: center; padding: 5px;"></div> </body></html>总结：就是以上步骤了。
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