websocket的java小实例

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websocket是实现实时信息传输的，建立较长时间的socket通讯，可以实现服务器的信息推送。

先创建一个WebSocket对象，指定要连接的服务器地址与端口

socket = new WebSocket("ws://127.0.0.1:8080/WebSocket/ws/mao");

WebSocket对象有几个方法：

onopen() 打开socket连接

onmessage() 获得消息事件

onclose() 关闭事件

onerror() 发生错误事件

send() 发送消息

代码

<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width" charset="UTF-8"/><title>WebSocket客户端</title></head><body><div><div id="area"></div><input type="button" id="btnConnection" value="连接" /><input type="button" id="btnClose" value="关闭" /><input type="button" id="btnSend" value="发送" /></div><script src="js/jquery.js" type="text/javascript" charset="utf-8"></script><script type="text/javascript">$(function() {var socket;if(typeof(WebSocket) == "undefined") {alert("您的浏览器不支持WebSocket");return;}$("#btnConnection").click(function() {//实现化WebSocket对象，指定要连接的服务器地址与端口socket = new WebSocket("ws://127.0.0.1:8080/WebSocket/ws/mao");//打开事件socket.onopen = function() {alert("Socket 已打开");//socket.send("这是来自客户端的消息" + location.href + new Date());};//获得消息事件socket.onmessage = function(msg) {$("#area").html(msg.data)};//关闭事件socket.onclose = function() {alert("Socket已关闭");};//发生了错误事件socket.onerror = function() {alert("发生了错误");}});$("#btnSend").click(function() {//发送信息socket.send("这是来自网页端的消息" + location.href + new Date());});$("#btnClose").click(function() {socket.close();});});</script></body></html>

后台代码也有与一样的方法

onOpen()

onMessage()

onClose()

onError()

sendMessage()

package action;import java.io.IOException;import javax.websocket.CloseReason;import javax.websocket.OnClose;import javax.websocket.OnError;import javax.websocket.OnMessage;import javax.websocket.OnOpen;import javax.websocket.Session;import javax.websocket.server.PathParam;import javax.websocket.server.ServerEndpoint;//ws://127.0.0.1:8080/ws/mao@ServerEndpoint("/ws/{user}")public class WebSocketTest {    private String currentUser;    private Session session;        //连接打开时执行    @OnOpen    public void onOpen(@PathParam("user") String user, Session session) {    System.out.println("连接打开");        currentUser = user;        this.session = session;        try {        for(int i=0;i<10;i++){sendMessage(""+i);Thread.sleep(1000);        }} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}                System.out.println("Connected ... " + session.getId());    }    //收到消息时执行    @OnMessage    public String onMessage(String message, Session session) {    System.out.println("收到消息时执行");        System.out.println(currentUser + "：" + message);        return currentUser + "：" + message+"这是返回值";    }    //连接关闭时执行    @OnClose    public void onClose(Session session, CloseReason closeReason) {    System.out.println("连接关闭");        System.out.println(String.format("Session %s closed because of %s", session.getId(), closeReason));    }    //连接错误时执行    @OnError    public void onError(Throwable t) {    System.out.println("连接错误");        t.printStackTrace();    }        public void sendMessage(String message) throws IOException{        this.session.getBasicRemote().sendText(message);    }    }

一个不错介绍websocket的博客点击打开链接

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