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springboot集成websocket向同一房间中的所有人发送信息

1. maven依赖

   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-websocket</artifactId>
   </dependency>
   

2. 配置类

   import org.springframework.context.annotation.Configuration;
   import org.springframework.web.socket.config.annotation.EnableWebSocket;
   import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
   import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
   
   @Configuration
   @EnableWebSocket
   public class WebSocketConfig implements WebSocketConfigurer {
   
       private final SocketHandler socketHandler;
   
       public WebSocketConfig(SocketHandler webSocketHandler) {
           this.socketHandler = webSocketHandler;
       }
   
       @Override
       public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
           // 设置允许的跨域请求
           registry.addHandler(socketHandler, "/websocket")
                   .setAllowedOrigins("*");
       }
   }
   

3. 服务

   import org.springframework.stereotype.Component;
   import org.springframework.web.socket.*;
   
   import javax.websocket.server.ServerEndpoint;
   import java.io.IOException;
   import java.util.HashMap;
   import java.util.Map;
   
   
   @ServerEndpoint("/websocket")
   @Component
   public class SocketHandler implements WebSocketHandler {
   
       private static final Map<String, Map<String, WebSocketSession>> roomSessionsMap = new HashMap<>();
   
       @Override
       public void afterConnectionEstablished(WebSocketSession session) throws Exception {
           System.out.println("WebSocket连接建立：" + session.getId());
   
           // 获取房间号
           String roomId = session.getUri().getQuery();
   
           // 获取该房间的WebSocketSession Map，如果不存在则创建
           Map<String, WebSocketSession> roomSessions = roomSessionsMap.get(roomId);
           if (roomSessions == null) {
               roomSessions = new HashMap<>();
               roomSessionsMap.put(roomId, roomSessions);
           }
           // 将WebSocketSession与房间号关联
           roomSessions.put(session.getId(), session);
       }
   
       @Override
       public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
           System.out.println("接收到WebSocket消息：" + message.getPayload());
   
           // 处理收到的消息
           String roomId = session.getUri().getQuery();
           Map<String, WebSocketSession> roomSessions = roomSessionsMap.get(roomId);
           if (roomSessions != null) {
               // 遍历发送给同一个房间的所有WebSocketSession
               for (WebSocketSession roomSession : roomSessions.values()) {
                   try {
                       roomSession.sendMessage(new TextMessage("服务器收到来自房间号："+roomId+"的消息：" + message.getPayload()));
                   } catch (IOException e) {
                       // 处理发送异常
                       e.printStackTrace();
                   }
               }
           }
       }
   
       @Override
       public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
   
       }
       @Override
       public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
           System.out.println("WebSocket连接关闭：" + session.getId());
   
           // 获取房间号
           String roomId = session.getUri().getQuery();
   
           // 获取该房间的WebSocketSession Map
           Map<String, WebSocketSession> roomSessions = roomSessionsMap.get(roomId);
           if (roomSessions != null) {
               // 移除与房间号关联的WebSocketSession
               roomSessions.remove(session.getId());
   
               // 如果房间中没有其他WebSocketSession了，移除房间
               if (roomSessions.isEmpty()) {
                   roomSessionsMap.remove(roomId);
               }
           }
       }
       @Override
       public boolean supportsPartialMessages() {
           return false;
       }
   }
   

4. 前端html代码

   <!DOCTYPE html>
   <html>
   <head>
       <meta charset="UTF-8">
       <title>WebSocket Example</title>
       <script>
           var socket = null;
           function initWebSocket() {
               var roomId = document.getElementById("roomId").value; // 设置房间号
               console.log("房间号：", roomId);
               if (roomId == null || roomId == "") {
                   alert("请输入房间名");
                   return;
               }
               alert("ws://localhost:8523/websocket?roomId=" + roomId)
               socket = new WebSocket("ws://localhost:8523/websocket?roomId=" + roomId);
   
               socket.onopen = function() {
                   console.log("WebSocket连接已建立");
                   socket.send("Hello, Server!");
               };
               socket.onmessage = function(event) {
                   console.log("接收到WebSocket消息：" + event.data);
               };
               socket.onclose = function(event) {
                   console.log("WebSocket连接已关闭", event);
               };
           }
           function sendMessage() {
               var message = document.getElementById("messageInput").value;
               socket.send(message);
           }
       </script>
   </head>
   <body>
   <input type="text" id="roomId" placeholder="房间号"/>
   <input type="button"  value="进入聊天室" onclick="initWebSocket()" /><br/>
   <input type="text" id="messageInput" placeholder="输入消息">
   <button onclick="sendMessage()">发送</button>
   </body>
   </html>
   

   注意事项：如果连接失败，可以看一下配置类代码中的路径，看和自己设置的路径是否一致：

   registry.addHandler(socketHandler, "/websocket").setAllowedOrigins("*");