Springboot整合Websocket

后端使用websocket主动向前端发送消息

    
        org.springframework.boot
        spring-boot-starter-websocket
    
    
        org.springframework.boot
        spring-boot-starter-thymeleaf
    

@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/websocket")
@Component
public class WebSocket {
    // 与某个客户端的连接会话，需要通过他来给客户端发送数据
    private Session session;

    //concurrent包的线程安全set，用来存放每个客户端对应的websocket对象
    private static CopyOnWriteArraySet webSockets = new CopyOnWriteArraySet<>();

    private static final Logger LOGGER = LoggerFactory.getLogger(WebSocket.class);

    
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSockets.add(this);
        LOGGER.info("【websocket消息】 有新的连接，总数{}", webSockets.size());
    }

    
    @OnClose
    public void onClose() {
        this.session = session;
        webSockets.remove(this);
        LOGGER.info("【websocket消息】 连接断开，总数{}", webSockets.size());
    }

    
    @OnMessage
    public void onMessage(String message) {
        LOGGER.info("【websocket消息】 收到客户端发来的消息：{}", message);
    }

    public void sendMessage(String message) {
        LOGGER.info("【websocket消息】 发送消息：{}", message);
        for (WebSocket webSocket : webSockets) {
            try {
                webSocket.session.getBasicRemote().sendText(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}