java WebSocket Demo

1、IDEA创建Module，结构如图（Tomcat8.0）

2、引入jar包：javax.websocket-api.jar

3、新建WebSocketTest类

import javax.websocket.OnClose;

import javax.websocket.OnMessage;

import javax.websocket.OnOpen;

import javax.websocket.Session;

import javax.websocket.server.ServerEndpoint;

import java.io.IOException;

/**

 * Created by JiaPeng on 2016/2/15.

 */

@ServerEndpoint("/websocket")

public class WebSocketTest {

    @OnMessage

    public void onMessage(String message, Session session) throws IOException, InterruptedException {

        System.out.println("Received: " + message);

        session.getBasicRemote().sendText("This is the first server message");

        int sendMessages = 0;

        while (sendMessages < 10) {

            Thread.sleep(5000);

            session.getBasicRemote().sendText("This is an intermediate server message. Count: " + sendMessages);

            sendMessages++;

        }

        session.getBasicRemote().sendText("This is the last server message");

    }

    @OnOpen

    public void OnOpen() {

        System.out.println("Client connected");

    }

    @OnClose

    public void OnClose() {

        System.out.println("Connection closed");

    }

}

4、index.jsp页面代码

<!DOCTYPE html>

<html>

<head>

    <title>Testing websockets</title>

</head>

<body>

<div>

    <input type="submit" value="Start" onclick="start()" />

</div>

<div id="messages"></div>

<script type="text/javascript">

    var webSocket =

            new WebSocket('ws://localhost:8080/websocket');

    webSocket.onerror = function(event) {

        onError(event)

    };

    webSocket.onopen = function(event) {

        onOpen(event)

    };

    webSocket.onmessage = function(event) {

        onMessage(event)

    };

    function onMessage(event) {

        document.getElementById('messages').innerHTML

                += '<br />' + event.data;

    }

    function onOpen(event) {

        document.getElementById('messages').innerHTML

                = 'Connection established';

    }

    function onError(event) {

        alert(event.data);

    }

    function start() {

        webSocket.send('hello');

        return false;

    }

</script>

</body>

</html>

巴特西

java WebSocket Demo

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