traffic-eff-backend/bd-location/src/main/java/com/ruoyi/bd/socket/UWBVideoTraceSocketServer.java

package com.ruoyi.bd.socket;

import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;

import javax.annotation.PostConstruct;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.CrossOrigin;

@ServerEndpoint("/ws/video/trace/{client}/{device}")
@CrossOrigin(origins = "*")
@Component
public class UWBVideoTraceSocketServer {
    private static final Logger logger = LoggerFactory.getLogger(UWBVideoTraceSocketServer.class);

    // 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 AtomicInteger onlineNum = new AtomicInteger();

    // concurrent包的线程安全Set，用来存放每个客户端对应的WebSocketServer对象。
    private static ConcurrentHashMap<String, Session> sessionPools = new ConcurrentHashMap<>();

    public static final String SESSION_KEY_TEMPLATE = "%s-%s";

    @PostConstruct
    public void init() {
        logger.info("WebSocketServer init");
    }

    // 发送消息
    public void sendMessage(Session session, String message) throws IOException {
        if (session != null) {
            synchronized (session) {
                logger.info("发送数据：{}", message);
                session.getBasicRemote().sendText(message);
            }
        }
    }

    // 群发消息
    public void broadcast(String message) {
        for (Session session : sessionPools.values()) {
            try {
                sendMessage(session, message);
            }
            catch (Exception e) {
                logger.info("server get {}", e.getMessage());
            }
        }
    }

    // 建立连接成功调用
    @OnOpen
    public void onOpen(Session session, @PathParam(value = "client") String client,
        @PathParam(value = "device") String device) {
        sessionPools.put(String.format(SESSION_KEY_TEMPLATE, client, device), session);
        addOnlineCount();
    }

    // 关闭连接时调用
    @OnClose
    public void onClose( @PathParam(value = "client") String client,
                         @PathParam(value = "device") String device) {
        sessionPools.remove(String.format(SESSION_KEY_TEMPLATE, client, device));
        subOnlineCount();
        logger.info("{}断开webSocket连接！当前人数为:{}", device, onlineNum);
    }

    // 收到客户端信息后，根据接收人的username把消息推下去或者群发
    // to=-1群发消息
    @OnMessage
    public void onMessage(String message) throws IOException {
        logger.info("server get {}", message);
    }

    // 错误时调用
    @OnError
    public void onError(Session session, Throwable throwable) {
        logger.info("server get {}", throwable.getMessage());
    }

    public static void addOnlineCount() {
        onlineNum.incrementAndGet();
    }

    public static void subOnlineCount() {
        onlineNum.decrementAndGet();
    }

    public static AtomicInteger getOnlineNumber() {
        return onlineNum;
    }

    public static ConcurrentHashMap<String, Session> getSessionPools() {
        return sessionPools;
    }
}