MicroCommunity/service-api/src/main/java/com/java110/api/websocket/MessageWebsocket.java

package com.java110.api.websocket;

import com.alibaba.fastjson.JSONObject;
import com.java110.dto.WsDataDto;
import com.java110.utils.util.StringUtil;
import com.java110.vo.ResultVo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

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

/**
 * @ClassName MessageWebsocket
 * @Description TODO
 * @Author wuxw
 * @Date 2020/6/5 12:16
 * @Version 1.0
 * add by wuxw 2020/6/5
 **/
@ServerEndpoint("/ws/message/{userId}")
@Component
public class MessageWebsocket {
    private final static Logger logger = LoggerFactory.getLogger(MessageWebsocket.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 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 ConcurrentHashMap<String, MessageWebsocket> webSocketMap = new ConcurrentHashMap<>();

    /**
     * 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 ConcurrentHashMap<String, String> clientMachineMap = new ConcurrentHashMap<>();
    /**
     * 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clientId
     */
    private String userId = "";


    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId) {
        this.session = session;
        this.userId = userId;
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            webSocketMap.put(userId, this);
            //加入set中
        } else {
            webSocketMap.put(userId, this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }


        logger.debug("用户连接:" + userId + ",当前在线人数为:" + getOnlineCount());

        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            logger.error("用户:" + userId + ",网络异常!!!!!!");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        logger.info("用户退出:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) throws IOException {
        logger.info("用户消息:" + userId + ",报文:" + message);
        //可以群发消息
        //消息保存到数据库、redis
        if (StringUtil.isEmpty(message)) {
            ResultVo resultVo = new ResultVo(ResultVo.CODE_ERROR, "未包含内容");
            webSocketMap.get(userId).sendMessage(resultVo.toString());
            return;
        }

        if (!StringUtil.isJsonObject(message)) {
            ResultVo resultVo = new ResultVo(ResultVo.CODE_ERROR, "不是有效数据格式");
            webSocketMap.get(userId).sendMessage(resultVo.toString());
            return;
        }

        WsDataDto wsDataDto = JSONObject.parseObject(message, WsDataDto.class);

        switch (wsDataDto.getCmd()){
            case WsDataDto.CMD_PING:
                webSocketMap.get(userId).sendMessage(wsDataDto.toString());
                break;
        }

//        //解析发送的报文
//        JSONObject jsonObject = JSONObject.parseObject(message);
//        //追加发送人(防止串改)
//        jsonObject.put("fromUserId", this.userId);
//        String toUserId = jsonObject.getString("toUserId");
//        //传送给对应toUserId用户的websocket
//        if (!StringUtil.isEmpty(toUserId) && webSocketMap.containsKey(toUserId)) {
//            webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
//        } else {
//            logger.error("请求的clientId:" + toUserId + "不在该服务器上");
//            //否则不在这个服务器上，发送到mysql或者redis
//        }


    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        logger.error("用户错误:" + this.userId + ",原因:" + error.getMessage());
        error.printStackTrace();
    }

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


    /**
     * 发送设备监控信息
     */
    public static void sendInfo(String message, String userId) throws IOException {
        logger.info("发送消息到:" + userId + "，报文:" + message);

        webSocketMap.get(userId).sendMessage(message);


    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        MessageWebsocket.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        MessageWebsocket.onlineCount--;
    }

}