springBoot 中webSocket 应用一

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<html>
<head>
<meta charset="UTF-8">
<title>websocket测试</title>
<style type="text/css">
h3, h4 {
text-align: center;
}
</style>
</head>
<body>
<h1>前端的信息查看控制台</h1><script type="text/javascript">
var socket;
if (typeof (WebSocket) == "undefined") {
console.log("遗憾：您的浏览器不支持WebSocket");
} else {
console.log("恭喜：您的浏览器支持WebSocket"); socket = new WebSocket("ws://localhost:8089/ws/asset");
//连接打开事件
socket.onopen = function () {
console.log("Socket 已打开");
socket.send("消息发送测试(From Client)");
};
//收到消息事件
socket.onmessage = function (msg) {
console.log("接收到的消息", msg.data);
};
//连接关闭事件
socket.onclose = function () {
console.log("Socket已关闭");
};
//发生了错误事件
socket.onerror = function () {
alert("Socket发生了错误");
}; //窗口关闭时，关闭连接
window.unload = function () {
socket.close();
};
}
</script></body>
</html>

package com.aiguigu.websocket.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
/**
如果是springBoot自带的嵌入式容器，则要开启
*/
@Configuration
public class WebGlobalConfig {
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}

定义webSocket类

package com.aiguigu.websocket.config;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;@ServerEndpoint(value = "/ws/asset")
@Component
public class MyWebSocket {
private static Logger log = LoggerFactory.getLogger(MyWebSocket.class);
/*自增操作*/
private static final 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Session对象。
private static CopyOnWriteArraySet<Session> SessionSet = new CopyOnWriteArraySet<Session>(); /**
* 连接建立成功调用的方法
*/
@OnOpen
public void onOpen(Session session) {
System.out.println("建立连接");
SessionSet.add(session);
// 在线数加1，并获取最后结果
int cnt = OnlineCount.incrementAndGet();
log.info("有连接加入，当前连接数为：{}", cnt);
SendMessage(session, "连接成功xxxxx");
} /**
* 连接关闭调用的方法
*/
@OnClose
public void onClose(Session session) {
SessionSet.remove(session);
int cnt = OnlineCount.decrementAndGet();
log.info("有连接关闭，当前连接数为：{}", cnt);
} /**
* 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) {
log.info("来自客户端的消息：{}", message);
SendMessage(session, "服务器发来的内容：" + message);
} /**
* 出现错误
*
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
log.error("发生错误：{}，Session ID： {}", error.getMessage(), session.getId());
error.printStackTrace();
} /**
* 发送消息，实践表明，每次浏览器刷新，session会发生变化。
*
* @param session
* @param message
*/
public static void SendMessage(Session session, String message) {
try {
session.getBasicRemote().sendText(String.format("%s (From Server，Session ID=%s)", message, session.getId()));
} catch (IOException e) {
log.error("发送消息出错：{}", e.getMessage());
e.printStackTrace();
}
} /**
* 群发消息
*
* @param message
* @throws IOException
*/
public static void BroadCastInfo(String message) throws IOException {
for (Session session : SessionSet) {
//判断如果websocket链接如果是开启的情况下，则发送信息
if (session.isOpen()) {
SendMessage(session, message);
}
}
} /**
* 指定Session发送消息
*
* @param sessionId
* @param message
* @throws IOException
*/
public static void SendMessage(String sessionId, String message) throws IOException {
Session session = null;
for (Session s : SessionSet) {
if (s.getId().equals(sessionId)) {
session = s;
break;
}
}
if (session != null) {
SendMessage(session, message);
} else {
log.warn("没有找到你指定ID的会话：{}", sessionId);
}
}}

定时发送

@Scheduled(cron = "*/3 * * * * *")
@ResponseBody
@GetMapping("/websocke")
public void webSocket() {
String s = "hello world";
try {
MyWebSocket.BroadCastInfo(s);
} catch (IOException e) {
System.out.println("执行异常");
e.printStackTrace();
}
}

入口文件开启

@SpringBootApplication
@EnableScheduling
public class WebsocketApplication { public static void main(String[] args) {
SpringApplication.run(WebsocketApplication.class, args);
}}

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