Jetty websocket

Izhuceul

　　使用jetty版本：jetty-websocket-8.0.4.v20111024.jar
　　使用servletapi版本：3.0
　　服务器端servlet继承 WebSocketServlet 实现websocket连接。如下代码：
　　public class Communicate extends WebSocketServlet {private static final long serialVersionUID = 5933410218860858657L;private static List<WSocket> clients = new ArrayList<WSocket>();
　　@Overridepublic WebSocket doWebSocketConnect(HttpServletRequest arg0, String arg1) {WSocket wsClinet = new WSocket();clients.add(wsClinet);
　　return wsClinet;}
　　public static List<WSocket> getClients() {return clients;}
　　public static void setClients(List<WSocket> clients) {Communicate.clients = clients;}}
　　使用自定义的文本消息的websocket：
　　public class WSocket implements OnTextMessage {private Connection connection;
　　@Overridepublic void onClose(int arg0, String arg1) {System.out.println("*** close:" + arg1);}
　　@Overridepublic void onOpen(Connection arg0) {System.out.println("*** open:" + arg0.getProtocol());connection = arg0;}
　　@Overridepublic void onMessage(String arg0) {List<WSocket> clients = Communicate.getClients();if (null == clients) {return;}
　　for (WSocket ws: clients) {try {Connection ct = ws.getConnection();if(null!= ct && ct.isOpen()) {ct.sendMessage(arg0);}} catch (IOException e) {System.out.println("*** send message exception.");e.printStackTrace();}}}
　　public Connection getConnection() {return connection;}}
　　实现逻辑：当接收到消息的时候，给各个客户端轮发。
　　web.xml配一个servlet：
　　<servlet>

       <servlet-name>communicate</servlet-name>  
<servlet-class>com.websocket.service.Communicate</servlet-class>  
</servlet>  
<servlet-mapping>  
<servlet-name>communicate</servlet-name>  
<url-pattern>communicate.htm</url-pattern>  
</servlet-mapping>

　　页面代码：
　　<script>
　　if(!window.WebSocket) {alert("not support websocket.");}
　　var socket = new WebSocket("ws://localhost:8080/WebSocketDemo/communicate.htm");socket.onmessage = function(evt) {alert(evt.data);}
　　socket.onclose = function() {alert("close.");}
　　socket.onopen = function() {alert("open connection.");}
　　function sendMsg() {socket.send('data');}</script>