话不多说直接上代码关于介绍websocket百度一大堆 这里只作为个人学习笔记吧
依赖添加
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>1.3.5.RELEASE</version>
</dependency>
穿件configer类
package com.zly.ws.websocket.confige; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.socket.server.standard.ServerEndpointExporter; /** * @Author zly * @Date 2018/11/6 11:22 */ @Configuration public class WebSocketConfig { @Bean public ServerEndpointExporter serverEndpointExporter(){ return new ServerEndpointExporter(); } }
新建一个mywebsocket
package com.zly.ws.websocket.mywebsocket; import com.zly.ws.websocket.entity.User; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import javax.servlet.http.HttpServletRequest; 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; import java.util.concurrent.CopyOnWriteArraySet; /** * @Author zly * @Date 2018/11/6 11:25 */ @ServerEndpoint(value = "/websocket") @Component public class MyWebSocket { public static int onlineCount=0; public static CopyOnWriteArraySet<MyWebSocket> sockets=new CopyOnWriteArraySet<>(); public Session session; public static Logger logger=LoggerFactory.getLogger(MyWebSocket.class); @OnOpen public void onOpen(Session session){ //User user = (User)request.getSession().getAttribute("user"); this.session = session; sockets.add(this); //加入set中 addOnlineCount(); //在线数加1 //System.out.println("有新连接加入！当前在线人数为" + getOnlineCount()); logger.info("链接加入！当前在线人数为"+getOnlineCount()); try { sendMessage(CommonConstant.CURRENT_WANGING_NUMBER.toString()); } catch (IOException e) { logger.info("IO异常"); } } @OnClose public void onClose() { sockets.remove(this); //从set中删除 subOnlineCount(); //在线数减1 logger.info("有人退出了链接！在线人数是："+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) { logger.info("客户端发来了消息"+message); //群发消息 for (MyWebSocket item : sockets) { try { item.sendMessage(message); } catch (IOException e) { e.printStackTrace(); } } } /** * 发生错误时调用 @OnError */ public void onError(Session session, Throwable error) { logger.info("发生了错误"); 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 : sockets) { try { item.sendMessage(message); } catch (IOException e) { continue; } } } public static synchronized int getOnlineCount() { return onlineCount; } public static synchronized void addOnlineCount() { MyWebSocket.onlineCount++; } public static synchronized void subOnlineCount() { MyWebSocket.onlineCount--; } }
最后前端页面
这里是用的是thymleaf
<!DOCTYPE HTML>
<html>
<head>
<title>My WebSocket</title>
</head>
<body>
Welcome {user.nickname}<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>
启动项目访问访问页面
