springboot3搭建WebSocket服务

在Spring Boot 3中搭建WebSocket服务，你可以使用Spring的WebSocket支持。以下是一个简单的例子，展示了如何配置和创建一个简单的WebSocket端点。

1. 添加依赖到你的pom.xml：

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

2. 配置WebSocket：

import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
 
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws").withSockJS();
    }
 
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.enableSimpleBroker("/topic");
        registry.setApplicationDestinationPrefixes("/app");
    }
}

3. 创建WebSocket端点：

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
 
@Controller
public class WebSocketController {
 
    // 如果是Java版本低于1.9，需要添加此Bean，用于支持WebSocket
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
 
    @GetMapping("/sendMessage")
    @ResponseBody
    public String sendMessage() {
        // 调用WebSocket方法发送消息
        // 示例中省略具体发送逻辑
        return "Message sent";
    }
}

4. 创建WebSocket服务端点：

import org.springframework.stereotype.Component;
import org.springframework.web.socket.server.standard.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
 
@Component
@ServerEndpoint("/ws")
public class WebSocketServer {
 
    private static final CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<>();
 
    priv