SpringBoot下实现原生Websocket

1、pom.xml中引入依赖

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

2、开启对Websocket的支持

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

3、封装server

package com.jxdinfo.gdjf.train.websocketOrigin;

import com.jxdinfo.gdjf.train.proto.HeartBeatClass;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/websocket")
@Component
public class WebSocketServer {
    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    //接收sid
    private String sid="";

    /**
     *  连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);     //加入set中
        addOnlineCount();           //在线数加1
        this.sid=sid;
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            System.out.print(e);
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        System.out.print("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     *  收到客户端消息后调用的方法
     * @param message
     * @param session
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.print("收到来自窗口" + sid + "的信息:");
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     *   错误处理
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.print("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
      this.session.getBasicRemote().sendText(message);
    }

    /**
     * 消息群发自定义
     * @param message
     * @param
     * @throws IOException
     */
    public static void sendInfo(String message) throws IOException {
        System.out.print("推送消息到窗口"+ "推送内容:"+message);
    }
    public static synchronized int getOnlineCount() {
        return onlineCount;
    }
    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }
    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
    public static CopyOnWriteArraySet<WebSocketServer> getWebSocketSet() {
        return webSocketSet;
    }
}