WebSocketServer.java 5.15 KB
package com.huaheng.framework.web.service;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.huaheng.pc.system.notice.service.SysNoticeService;
import lombok.extern.slf4j.Slf4j;
import com.huaheng.common.utils.StringUtils;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;

/**
 * WebSocket服务
 * @author mahua
 * @date 2020/5/17
 */
@ServerEndpoint("/imserver/{userId}")
@Component
@Slf4j
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 ConcurrentHashMap<String,WebSocketServer> webSocketMap = 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userId*/
    private String userId="";

    @Resource
    private SysNoticeService noticeService;

    /**
     * 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
        }

        System.out.println("用户连接:"+userId+",当前在线人数为:" + getOnlineCount());
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            System.out.println("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();
        }
        System.out.println("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) {
        //可以群发消息
        //消息保存到数据库、redis
        if(StringUtils.isNotBlank(message)){
            try {
                //解析发送的报文
                JSONObject jsonObject = JSON.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(StringUtils.isNotBlank(toUserId)&&webSocketMap.containsKey(toUserId)){
                    webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
                }else{
                    System.out.println("请求的userId:"+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
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("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);
    }


    /**
     * 发送自定义消息
     * */
    public static void sendInfo(String message,@PathParam("userId") String userId) throws IOException {

        if(webSocketMap.isEmpty()){
            log.error("没有窗口号!!!!!!!!!");
        }
        webSocketMap.forEach((k,v)->{
            try {
                //这里可以设定只推送给这个winNum的,为null则全部推送
                if(StringUtils.isEmpty(userId)) {
                    v.sendMessage(message);
                    log.info("推送消息到窗口:{},推送内容: {}",message);
                }else if(k.equals(userId)){
                    log.info("推送消息到窗口:{},推送内容: {}",userId,message);
                    v.sendMessage(message);
                }
            } catch (IOException e) {
                e.printStackTrace();
                log.info("找不到指定的 WebSocket 客户端:{}",userId);
            }
        });
    }

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

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

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

}