Pushler初级Demo2 - 服务器端主动推送消息

来源：互联网发布：增值税发票抵扣软件编辑：程序博客网时间：2024/06/06 00:56

参考文章:http://blog.sina.com.cn/s/blog_58b9cb3a01014l71.html

1.> 添加基础文件

jar : pushlet.jar
src : source.properties | pushlet.properties

js : ajax-pushlet-client.js | js-pushlet-client.js

该DEMO下载地址

2.> web.xml
两个Servlet,一个是pushlet 并且要提前初始化,另一个我们自己的Servlet

<servlet>  <servlet-name>pushlet</servlet-name>  <servlet-class>nl.justobjects.pushlet.servlet.Pushlet</servlet-class>  <load-on-startup>1</load-on-startup></servlet><servlet-mapping>   <servlet-name>pushlet</servlet-name>   <url-pattern>/pushlet.srv</url-pattern></servlet-mapping>  <servlet>    <servlet-name>MyServlet</servlet-name>    <servlet-class>zy.pushlet.web.MyServlet</servlet-class></servlet><servlet-mapping>    <servlet-name>MyServlet</servlet-name>    <url-pattern>/myServlet.do</url-pattern></servlet-mapping>

3.> 不需要再去修改 source.properties 再去注册事件源了.

4.> MyServlet

public class MyServlet extends HttpServlet {private String meg;protected void service(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {       //获取内容并转码       meg = request.getParameter("meg");       meg = new String(meg.getBytes("UTF-8"),"ISO-8859-1");                //初始化事件实例，并发送       Event event = Event.createDataEvent("/Pointer");       event.setField("data", meg);       Dispatcher.getInstance().multicast(event);             response.sendRedirect(request.getContextPath()+"/input.jsp");}}

5.> 发送端和接收端

input.jsp

<% request.setAttribute("ctx", request.getContextPath()); %><form action="${ctx}/myServlet.do">    消息内容 : <input type="text" name="meg" />    <input type="submit" value="发送" /></form>

receive.jsp

<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><script type="text/javascript" src="ajax-pushlet-client.js"></script></head><body>  <div>     接收到的内容 :     <div id="receive">         </div>  </div>  <script type="text/javascript">       PL._init();       PL.joinListen('/Pointer');        var receive = document.getElementById("receive");       function onData(event) {            receive.innerHTML = receive.innerHTML + event.get("data") +"<br/>";       }  </script></body></html>

6.> Test

分别打开两个页面,input.jsp 和 receive.jsp