/*
* Copyright (c) 2012-2032 Accounting Center of China Aviation(ACCA).
* All Rights Reserved.
*/
package com.acca.action;
import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.directwebremoting.Browser;
import org.directwebremoting.ScriptSessions;
import org.directwebremoting.ServerContextFactory;
import com.opensymphony.xwork2.ActionSupport;
/**
*
*
*
* @author zhouhua, 2012-11-25
*/
public class PublishAction extends ActionSupport {
private String msg;
/**
* @return the msg
*/
public String getMsg() {
return msg;
}
/**
* @param msg the msg to set
*/
public void setMsg(String msg) {
this.msg = msg;
}
public String showMsg(){
HttpServletResponse response= ServletActionContext.getResponse();
response.setContentType("text/html;charset=utf8");
String page = ServerContextFactory.get().getContextPath() + "/message.jsp";
Browser.withPage(page, new Runnable() {
public void run() {
ScriptSessions.addScript("showMsg('" + msg + "')");
}
});
try {
response.getWriter().print(msg);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(msg);
return SUCCESS;
}
}
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<!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;">
<title>Insert title here</title>
<script type="text/javascript" src="dwr/engine.js"></script>
<script type="text/javascript" src="jquery/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(function() {
dwr.engine.setActiveReverseAjax(true);
});
function showMsg(msg) {
alert(msg);
}
</script>
</head>
<body>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<!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;">
<title>Insert title here</title>
</head>
<body>
<form action="publishAction.action" method="post">
<input type="text" name="msg">
<input type="submit" value="send">
</form>
</body>
</html>
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<welcome-file-list>
<welcome-file>send.jsp</welcome-file>
</welcome-file-list>
<listener>
<listener-class>org.directwebremoting.servlet.DwrListener</listener-class>
</listener>
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<!-- This should NEVER be present in live -->
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<!-- Remove this unless you want to use active reverse ajax -->
<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>
<!-- By default DWR creates application scope objects when they are first
used. This creates them when the app-server is started -->
<init-param>
<param-name>initApplicationScopeCreatorsAtStartup</param-name>
<param-value>true</param-value>
</init-param>
<!-- WARNING: allowing JSON-RPC connections bypasses much of the security
protection that DWR gives you. Take this out if security is important -->
<init-param>
<param-name>jsonRpcEnabled</param-name>
<param-value>true</param-value>
</init-param>
<!-- WARNING: allowing JSONP connections bypasses much of the security
protection that DWR gives you. Take this out if security is important -->
<init-param>
<param-name>jsonpEnabled</param-name>
<param-value>true</param-value>
</init-param>
<!-- data: URLs are good for small images, but are slower, and could OOM for
larger images. Leave this out (or keep 'false') for anything but small images -->
<init-param>
<param-name>preferDataUrlSchema</param-name>
<param-value>false</param-value>
</init-param>
<!-- This enables full streaming mode. It's probably better to leave this
out if you are running across the Internet -->
<init-param>
<param-name>maxWaitAfterWrite</param-name>
<param-value>-1</param-value>
</init-param>
<!--
For more information on these parameters, see:
- http://getahead.org/dwr/server/servlet
- http://getahead.org/dwr/reverse-ajax/configuration
-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="struts" extends="struts-default" namespace="/">
<action name="publishAction" class="com.acca.action.PublishAction" method="showMsg">
<result>message.jsp</result>
</action>
</package>
</struts>
1.消息接收页面必须引入：
<script type="text/javascript" src="dwr/engine.js"></script>
2.所需jar包，因为本示例是结合struts2实现，所需jar包如下：
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
commons-logging-1.0.4.jar
dwr.jar
freemarker-2.3.15.jar
ognl-2.7.3.jar
struts2-core-2.1.8.1.jar
xwork-core-2.1.6.jar
3.运行示例：
1）将示例部署到服务器上，启动服务器，访问http://localhost:8080/demo_dwr进入发送页面；
2）然后在新建一个页面，访问http://localhost:8080/demo_dwr/message.jsp进入接收页面，是接收页面保持打开状态
3）发送页面输入要发送的公告或消息，接收页面会弹出相应的信息
