WebSocket详解（Java后端，基于Springboot）

import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.handler.TextWebSocketHandler;
 
public class MyWebSocketHandler extends TextWebSocketHandler {
 
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        System.out.println("Connected ... " + session.getId());
    }
 
    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        System.out.println("Received message: " + message.getPayload());
        // 发送消息回客户端
        session.sendMessage(new TextMessage("Hello, client!"));
    }
 
    @Override
    public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
        System.out.println("Transport error " + session.getId() + ":" + exception.getMessage());
    }
 
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
        System.out.println("Connection closed " + session.getId());
    }
}

这段代码定义了一个MyWebSocketHandler类，它继承自TextWebSocketHandler。在这个类中，我们覆盖了四个方法：afterConnectionEstablished、handleTextMessage、handleTransportError和afterConnectionClosed。这些方法分别在WebSocket连接建立、接收消息、传输发生错误和连接关闭时被调用。在handleTextMessage方法中，我们接收到消息后，向客户端发送了一个问候消息。这个例子展示了如何在WebSocket连接中使用Spring Boot处理文本消息。