1、MyWebSocket

package org.hxm.webSocket;

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger; import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint; import org.springframework.stereotype.Component; @ServerEndpoint(value = "/websocket")
@Component
public class MyWebSocket { // 静态变量,用来记录当前在线连接数。应该把它设计成线程安全的。
private static AtomicInteger onlineCount = new AtomicInteger(0); // concurrent包的线程安全Set,用来存放每个客户端对应的MyWebSocket对象。
private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>(); // 与某个客户端的连接会话,需要通过它来给客户端发送数据
private Session session; /**
* 连接建立成功调用的方法
*/
@OnOpen
public void onOpen(Session session) {
this.session = session;
webSocketSet.add(this); // 加入set中
onlineCount.incrementAndGet(); // 在线数加1
System.out.println("有新连接加入!当前在线人数为" + getOnlineCount());
try {
sendMessage("有新连接加入");
} catch (IOException e) {
System.out.println("IO异常");
}
} /**
* 连接关闭调用的方法
*/
@OnClose
public void onClose() {
webSocketSet.remove(this); // 从set中删除
onlineCount.decrementAndGet(); // 在线数减1
System.out.println("有一连接关闭!当前在线人数为" + getOnlineCount());
} /**
* 收到客户端消息后调用的方法
*
* @param message
* 客户端发送过来的消息
*/
@OnMessage
public void onMessage(String message, Session session) {
System.out.println("来自客户端的消息:" + message); // 群发消息
for (MyWebSocket item : webSocketSet) {
try {
item.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
}
} /**
* 发生错误时调用
*/
@OnError
public void onError(Session session, Throwable error) {
System.out.println("发生错误");
error.printStackTrace();
} public void sendMessage(String message) throws IOException {
this.session.getBasicRemote().sendText(message);
// this.session.getAsyncRemote().sendText(message);
} /**
* 群发自定义消息
*/
public static void sendInfo(String message) throws IOException {
for (MyWebSocket item : webSocketSet) {
try {
item.sendMessage(message);
} catch (IOException e) {
continue;
}
}
} public static synchronized int getOnlineCount() {
return onlineCount.getAndIncrement();
} }

2、WebSocketConfig

package org.hxm.webSocket;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter; @Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}

3、Application

package org.hxm.webSocket;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Scanner; import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication
public class Application { public static void main(String[] args) throws InterruptedException {
SpringApplication.run(Application.class, args); }

4、Test.html

<html>
<head>
<title>My WebSocket</title>
</head> <body>
Welcome<br/>
<input id="text" type="text" /><button onclick="send()">Send</button> <button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body> <script type="text/javascript">
var websocket = null; //判断当前浏览器是否支持WebSocket
if('WebSocket' in window){
websocket = new WebSocket("ws://localhost:8080/websocket");
}
else{
alert('Not support websocket')
} //连接发生错误的回调方法
websocket.onerror = function(){
setMessageInnerHTML("error");
}; //连接成功建立的回调方法
websocket.onopen = function(event){
setMessageInnerHTML("open");
} //接收到消息的回调方法
websocket.onmessage = function(event){
setMessageInnerHTML(event.data);
} //连接关闭的回调方法
websocket.onclose = function(){
setMessageInnerHTML("close");
} //监听窗口关闭事件,当窗口关闭时,主动去关闭websocket连接,防止连接还没断开就关闭窗口,server端会抛异常。
window.onbeforeunload = function(){
websocket.close();
} //将消息显示在网页上
function setMessageInnerHTML(innerHTML){
document.getElementById('message').innerHTML += innerHTML + '<br/>';
} //关闭连接
function closeWebSocket(){
websocket.close();
} //发送消息
function send(){
var message = document.getElementById('text').value;
websocket.send(message);
}
</script>
</html>
05-26 22:52