在Spring Boot中使用WebSocket，你可以利用Spring的@EnableWebSocketMessageBroker注解来配置一个WebSocket消息代理。以下是一个简单的例子：
- 添加依赖到你的
pom.xml：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>- 配置WebSocket消息代理：
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");
}
}- 创建一个控制器来处理WebSocket消息：
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class WebSocketController {
@MessageMapping("/hello")
@SendTo("/topic/greetings")
public String greeting(String message) {
return "Hello, " + message + "!";
}
}- 前端使用WebSocket的例子（使用SockJS和STOMP）：
<script src="https://cdn.jsdelivr.net/npm/sockjs-client@1.7.0/dist/sockjs.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/stompjs@2.3.3/stomp.min.js"></script>
<script type="text/javascript">
var socket = new SockJS('/ws');
var stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/greetings', function(greeting){
console.log(greeting.body);
});
});
function sendN