websocket+springboot+vue+element ui完成数据表格的实时数据

java部分：

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.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @description:TODO
 * @author:xing.Li
 * @date:2019/8/26 10:02
 */
@Component
@ServerEndpoint("/websocket/{code}")
//此注解相当于设置访问URL
public class WebSocket {

    private Session session;

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

    @OnOpen
    public void onOpen(Session session, @PathParam(value="code")String code) {
        this.session = session;
        webSockets.add(this);
        sessionPool.put(code, session);
        Constants.WEBSOCKET = true;//定义常亮是否开启websocket连接
        System.out.println("【websocket消息】有新的连接，总数为:"+webSockets.size());
    }

    @OnClose
    public void onClose() {
        webSockets.remove(this);
        Constants.WEBSOCKET = false;
        System.out.println("【websocket消息】连接断开，总数为:"+webSockets.size());
    }

    @OnMessage
    public void onMessage(String message) {
        System.out.println("【websocket消息】收到客户端消息:"+message);
    }

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

    // 此为单点消息
    public void sendOneMessage(String code, String message) {
        Session session = sessionPool.get(code);
        /*在发送数据之前先确认 session是否已经打开 使用session.isOpen() 为true 则发送消息
        * 不然会报错:The WebSocket session [0] has been closed and no method (apart from close()) may be called on a closed session */
        if (session != null && session.isOpen()) {
            try {
                session.getAsyncRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

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

/**
 * @description:TODO
 * @author:xing.Li
 * @date:2019/8/25 17:44
 */
@Configuration
public class WebSocketConfig {
    /**
     * 注入ServerEndpointExporter，
     * 这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint
     */
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }

}

最终要的当然是jar包了

<!--websocket-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
    <version>1.5.3.RELEASE</version>
    <type>pom</type>
</dependency>

js部分：

data(){} 中

created() { // 页面创建生命周期函数
    this.initWebSocket()
},
destroyed: function () { // 离开页面生命周期函数
    this.websocketclose();
},

methods中

initWebSocket: function () {
    // WebSocket与普通的请求所用协议有所不同，ws等同于http，wss等同于https   key你自定义的key
    var host = window.location.host;
    this.websock = new WebSocket("ws://" + host + "/websocket/key");
    this.websock.onopen = this.websocketonopen;
    this.websock.onerror = this.websocketonerror;
    this.websock.onmessage = this.websocketonmessage;
    this.websock.onclose = this.websocketclose;
},
websocketonopen: function () {
    console.log("WebSocket连接成功");
    console.log("WebSocket正在发送实时数据.......");
},
websocketonerror: function (e) {
    console.log("WebSocket连接发生错误");
},
websocketonmessage: function (e) {
       JSON.parse(e.data); //这个是收到后端主动推送的值
    }
},
websocketclose: function (e) {
    console.log("WebSocket连接断开");
}

实现思路：通过websocket长连接从后端主动推送数据，利用vue的双向绑定实现数据同步

注：因为数据的改变也会刷新表格上复选框的选中状态，本人思路为，element ui中有选中复选框的值得集合，判断复选框里面有没有值，有值的话就是在操作数据，这时停止websocket的连接，操作完成后，复选框值所在集合也就没有值了，这时再开启websocket连接，这样也有问题，但是算是实现了吧。。。。

在此记录方便以后观看

当然上面的部分代码是忘记那位博主的了，时间太久找不到链接了，就不放原文链接了