springboot后端websocket简单实现上下行数据传输

配置

package com.mlfo.wmb.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Configuration
public class WekSocketConfig {

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

}

实现

package com.mlfo.wmb.message.websocket;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.IdUtil;
import com.alibaba.fastjson.JSONObject;
import com.mlfo.wmb.message.controller.Command;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.CrossOrigin;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;

@Component
@Slf4j
@CrossOrigin(origins = "*")
@ServerEndpoint("/websocket/{userId}")
public class WebSocket {

    private Session session;

    private static CopyOnWriteArraySet<WebSocket> webSockets = new CopyOnWriteArraySet<>();
    private static Map<String, Session> sessionPool = new HashMap<>();

    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            webSockets.add(this);
            sessionPool.put(userId, session);
            log.info("【websocket消息】有新的连接，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }

    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            log.info("【websocket消息】连接断开，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }

    @OnMessage
    public void onMessage(String cmd) {
        //todo 现在有个定时任务刷，应该去掉
        log.info("【websocket消息】收到客户端消息:" + cmd);
        if(cmd.equals("random")){
            testGetList();
        }

    }

    public void testGetList(){
        String cmd = "random";
        JSONObject ob = new JSONObject();
        ob.put("uuid",IdUtil.simpleUUID());
        Command command = new Command(cmd, ob);
        Session session = sessionPool.get("1");
        if (session != null && session.isOpen()) {
            try {
                log.info("【websocket消息】 发送数据:" + command.toString());
                session.getAsyncRemote().sendText(JSONObject.toJSONString(command));
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else {
            log.info("【websocket消息】 未成功发送消息");
        }
    }

    // 此为广播消息
    public void sendAllMessage(String message) {
        log.info("【websocket消息】广播消息:" + message);
        for (WebSocket webSocket : webSockets) {
            try {
                if (webSocket.session.isOpen()) {
                    webSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息
    public void sendOneMessage(String userId, String message) {
        Session session = sessionPool.get(userId);
        if (session != null && session.isOpen()) {
            try {
                log.info("【websocket消息】 单点消息:" + message);
                session.getAsyncRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息(多人)
    public void sendMoreMessage(String[] userIds, String message) {
        for (String userId : userIds) {
            Session session = sessionPool.get(userId);
            if (session != null && session.isOpen()) {
                try {
                    log.info("【websocket消息】 单点消息:" + message);
                    session.getAsyncRemote().sendText(message);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

    }

    @Scheduled(cron = "0/1 * * * * ?")
    public void sendMessage() {
//        JSONObject obj = new JSONObject();
//        obj.put(WebsocketConst.MSG_CMD, WebsocketConst.CMD_CHECK);//业务类型
//        obj.put(WebsocketConst.MSG_TXT, "心跳响应");//消息内容
//        session.getAsyncRemote().sendText(obj.toJSONString());
//        log.info("10秒定时发送消息....");
        Session session = sessionPool.get("1");
        //log.info("session:" + session);
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("cmd","time");
        String now = DateUtil.now();
        jsonObject.put("dateTime",now);
        Command command = new Command("time", DateUtil.now());
        if (session != null && session.isOpen()) {
            try {
                //log.info("【websocket消息】 定时发送时间消息:" + command.toString());
                session.getAsyncRemote().sendText(JSONObject.toJSONString(command));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }


}