maven:
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency>
WebSocketConfig:
package com.example.alarmdatagenerator.websocket; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.socket.server.standard.ServerEndpointExporter; /** * 开启WebSocket支持 * @author zhengkai */ @Configuration public class WebSocketConfig { @Bean public ServerEndpointExporter serverEndpointExporter() { return new ServerEndpointExporter(); } }
WebSocketServer:
package com.example.alarmdatagenerator.websocket; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Component; import javax.websocket.*; import javax.websocket.server.ServerEndpoint; import java.io.IOException; import java.util.concurrent.CopyOnWriteArraySet; @ServerEndpoint("/sockjs/test") @Component @Slf4j public class WebSocketServer { //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 int onlineCount = 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<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>(); //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; //接收sid private String sid=""; /** * 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 try { sendMessage("连接成功"); } catch (IOException e) { log.error("websocket IO异常"); } } /** * 连接关闭调用的方法 */ @OnClose public void onClose() { webSocketSet.remove(this); //从set中删除 } /** * 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("收到来自窗口"+sid+"的信息:"+message); //群发消息 for (WebSocketServer item : webSocketSet) { try { item.sendMessage(message); } catch (IOException e) { e.printStackTrace(); } } } /** * * @param session * @param error */ @OnError public void onError(Session session, Throwable error) { log.error("发生错误"); error.printStackTrace(); } /** * 实现服务器主动推送 */ public void sendMessage(String message) throws IOException { this.session.getBasicRemote().sendText(message); } /** * 群发自定义消息 * */ public static void sendInfo(String message,String sid) throws IOException { log.info("推送消息到窗口"+sid+",推送内容:"+message); for (WebSocketServer item : webSocketSet) { try { //这里可以设定只推送给这个sid的,为null则全部推送 if(sid==null) { item.sendMessage(message); }else if(item.sid.equals(sid)){ item.sendMessage(message); } } catch (IOException e) { log.error(e.getMessage(), e); continue; } } } }