版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/kkgbn/article/details/51887018
服务端
@Configuration
public class WebSocketConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter(){
return new ServerEndpointExporter();
}
}
@ServerEndpoint("/websocket")
@Component
public class WebSocketTest {
private static int onlineCount = 0;
private static CopyOnWriteArraySet<WebSocketTest> webSocketSet = new CopyOnWriteArraySet<>();
private Session session;
@OnOpen
public void onOpen(Session session) {
this.session = session;
webSocketSet.add(this);
addOnlineCount();
System.out.println("有新链接加入!当前在线人数为" + getOnlineCount());
}
@OnClose
public void onClose() {
webSocketSet.remove(this);
subOnlineCount();
System.out.println("有一链接关闭!当前在线人数为" + getOnlineCount());
}
@OnMessage
public void onMessage(String message, Session session) throws IOException {
System.out.println("来自客户端的消息:" + message);
// 群发消息
for (WebSocketTest item : webSocketSet) {
item.sendMessage(message);
item.sendMessage(message);
item.sendMessage(message);
}
}
public void sendMessage(String message) throws IOException {
this.session.getBasicRemote().sendText(message);
}
public static synchronized int getOnlineCount() {
return WebSocketTest.onlineCount;
}
public static synchronized void addOnlineCount() {
WebSocketTest.onlineCount++;
}
public static synchronized void subOnlineCount() {
WebSocketTest.onlineCount--;
}
}
客户端
<!DOCTYPE HTML>
<html>
<head>
<base href="localhost://localhost:8080/">
<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:8084/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>