Pushlet简单入门实例

Pushlet后台推送实例

工程目录如下：

1、下载jar包，下载地址 http://sourceforge.net/projects/pushlets/

2、将jar包拷到WebContent/WEB-INF/lib目录下，js文件拷贝到对应目录，pushlet.properties和sources.properties拷贝到WEB-INF目录下。

　　sources.properties文件中增加如下配置

　　source7=com.zts.pushlet.PushLetTest

3、PushLetTest.java

 1 package com.zts.pushlet;
 2 
 3 import java.io.Serializable;
 4 
 5 import nl.justobjects.pushlet.core.Event;
 6 import nl.justobjects.pushlet.core.EventPullSource;
 7 
 8 @SuppressWarnings("serial")
 9 public class PushLetTest extends EventPullSource implements Serializable
10 {
11     private int index = 0;
12     
13     /**
14      * 设置休眠时间
15      */
16     @Override
17     protected long getSleepTime()
18     {
19         return 3000;
20     }
21     
22     /**
23      * 创建事件 业务部分写在pullEvent()方法中，这个方法会被定时调用。
24      */
25     @Override
26     protected Event pullEvent()
27     {
28         Event event = Event.createDataEvent("/zts/pushlet");
29         event.setField("result", index + "HelloWorld.");
30         index++;
31         return event;
32     }
33     
34 }

4、index.jsp

 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 2 <%@ page contentType="text/html;charset=UTF-8"%>
 3 <html>
 4   <head>
 5     <title>HelloWorld</title>
 6     <script type="text/javascript" src="ajax-pushlet-client.js"></script>
 7     <script type="text/javascript"> 
 8        PL._init(); 
 9        PL.joinListen('/zts/pushlet'); 
10        function onData(event) {
11          //console.log(event.get("result")); 
12          var obj = document.getElementById("content");
13          obj.innerHTML = obj.innerHTML + event.get("result") + "<br/>";
14        }  
15     </script>
16   </head>
17 
18   <body>
19       <div id="content" style="border:1px solid #000; 200px;">推送内容如下：</div>
20   </body>
21 </html>

5、web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
 3     <!-- 缺省js文件通过"pushlet.srv"名字触发servlet的。不需要修改<url-pattern>/pushlet.srv</url-pattern>，
 4     如果修改，需要在对应的js文件中也要修改对应的名字。
 5     PL.pushletURL = PL._getWebRoot() + 'pushlet.srv';
 6      -->
 7     <servlet>
 8         <servlet-name>pushlet</servlet-name>
 9         <servlet-class>nl.justobjects.pushlet.servlet.Pushlet</servlet-class>
10         <load-on-startup>1</load-on-startup>
11     </servlet>
12     <servlet-mapping>
13         <servlet-name>pushlet</servlet-name>
14         <url-pattern>/pushlet.srv</url-pattern>
15     </servlet-mapping>
16     
17     
18     <welcome-file-list>
19         <welcome-file>index.jsp</welcome-file>
20     </welcome-file-list>
21 </web-app>

浏览器打开后的输出结果如下：

如果多个推送，js文件多次拷贝修改名字，区别即可。