kmall-haikong/kmall-admin/src/main/java/com/kmall/admin/websocket/WebSocketServer.java

package com.kmall.admin.websocket;

import com.alibaba.fastjson.JSONObject;
import com.kmall.admin.entity.PickUpCodeEntity;
import com.kmall.admin.service.PickUpCodeService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * WebSocket服务端
 *
 * 新建一个CopyOnWriteArraySet SessionSet 用于接收当前会话的Session，方便进行推送消息。单机版实现到这里就可以
 * 集群版（多个ws节点）还需要借助mysql或者redis等进行处理，改造对应的sendMessage方法即可
 *
 * @author Scott Chen
 * @date 2019-11-06
 */
// 前端发起的启动WebSocket服务地址
@ServerEndpoint(value = "/ws/server/{param}")
@Component
public class WebSocketServer {
    private static final Logger logger = LoggerFactory.getLogger(WebSocketServer.class);

    private static final AtomicInteger OnlineCount = new AtomicInteger(0);

    private static CopyOnWriteArraySet<Session> SessionSet ;
    // 存放取货码，key是收银员编号
    private static Map<String, List<PickUpCodeEntity>> pickUpCodeMap ;

    private static List<PickUpCodeEntity> pickUpList ;
    static {
        // concurrent包的线程安全Set，用来存放每个客户端对应的Session对象。
        SessionSet = new CopyOnWriteArraySet<Session>();
        pickUpCodeMap = new HashMap<>();
        pickUpList = new ArrayList<>();
    }





    private static PickUpCodeService pickUpCodeService;
    @Autowired
    public void setOptionService(PickUpCodeService pickUpCodeService) {
        WebSocketServer.pickUpCodeService = pickUpCodeService;
    }

    public static void delete(String sessionId, Integer storeId, PickUpCodeEntity pickUpCodeEntity) throws IOException {
//        List<PickUpCodeEntity> pickUpCodeEntities = pickUpCodeMap.get(storeId+"");
//        for(PickUpCodeEntity pick : pickUpList){
//            if(pick.getPickUpCodeSn().equalsIgnoreCase(pickUpCodeEntity.getPickUpCodeSn())){
//                pickUpList.remove(pick);
//            }
//        }

        sendMessage(sessionId,"delete",storeId+"");

    }

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session,@PathParam(value="param")String param ) {
        List<PickUpCodeEntity> pickUpCodeEntities = pickUpCodeMap.get(param);
        // TODO
//        if(pickUpCodeEntities == null){
            // 查询所有的取货码
        Map<String,Object> dataParam = new HashMap<>();
        dataParam.put("pickUpCodeCreatetime",new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
//        dataParam.put("pickUpCodeStatus","0");
        pickUpList = pickUpCodeService.queryList(dataParam);
        pickUpCodeMap.put(param,pickUpList);
//        }
        SessionSet.add(session);
        logger.info("WebSocket连接请求 session id：{}", session.getId());
        // 在线数加1
        int cnt = OnlineCount.incrementAndGet();
        logger.info("WebSocket当前连接数为：{}", cnt);
        sendMessage(session, "服务端返回WebSocket连接成功",param);
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        SessionSet.remove(session);
        logger.info("WebSocket连接关闭 session id：{}", session.getId());

        int cnt = OnlineCount.decrementAndGet();
        logger.info("WebSocket连接关闭，当前连接数为：{}", cnt);
    }

    /**
     * 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) {
        logger.info("来自客户端[{}]的消息：[{}]", session.getId(), message);
        logger.info("Server开始广播推送客户端[{}]发来的新消息", session.getId());
        // sendMessage(session, message);
        broadcastInfo(message + "，【消息产生于：" + session.getId() + "】");

    }

    /**
     * 出现错误
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        logger.error("发生错误：{}，Session ID： {}", error.getMessage(), session.getId());
        error.printStackTrace();
    }

    /**
     * 发送消息，实践表明，每次浏览器刷新，session会发生变化。
     *
     * @param session
     * @param message
     */
    public static void sendMessage(Session session, String message,String picNo) {
        try {
//            List<PickUpCodeEntity> pickUpCodeEntities = new ArrayList<>();
            logger.info(picNo);
//            if(picNo != null){
//                pickUpCodeEntities = pickUpCodeMap.get(picNo);
//            }
            Map<String,Object> data = new HashMap<>();
            if("服务端返回WebSocket连接成功".equalsIgnoreCase(message)){

                data.put("sessionId",session.getId());
                data.put("pickUpCodeList",pickUpList);

                String info = JSONObject.toJSONString(data);
                session.getBasicRemote().sendText(info);
//                logger.info("发送条形码给前端,内容：" + info);
            }else{
                if("broadcast".equalsIgnoreCase(message)){
                    Map<String,Object> dataParam = new HashMap<>();
                    dataParam.put("pickUpCodeCreatetime",new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
                    List<PickUpCodeEntity> pickUpList = pickUpCodeService.queryList(dataParam);
                    data.put("pickUpCodeList", pickUpList);
                    String info = JSONObject.toJSONString(data);
                    session.getBasicRemote().sendText(info);
//                    logger.info("发送条形码给前端,内容：" + info);
                }else {
                    // 根据订单id查询条形码，返回给前端页面
                    PickUpCodeEntity pickUpCodeEntity = pickUpCodeService.queryObject(message);
                    pickUpList.add(pickUpCodeEntity);

                    data.put("pickUpCodeList", pickUpList);
                    String info = JSONObject.toJSONString(data);
                    session.getBasicRemote().sendText(info);
//                    logger.info("发送条形码给前端,内容：" + info);
                }
            }


        } catch (IOException e) {
            logger.error("发送消息出错：{}", e.getMessage());
            e.printStackTrace();
        }
    }

    /**
     * 群发消息
     *
     * @param message
     * @throws IOException
     */
    public static void broadcastInfo(String message) {
        logger.info("Server broadcast info....");
        for (Session session : SessionSet) {
            if (session.isOpen()) {
                logger.info("broadcast send session id is " + session.getId());
                sendMessage(session, message,null);
            }
        }
    }

    /**
     * 指定Session发送消息
     *
     * @param sessionId
     * @param message
     * @throws IOException
     */
    public static void sendMessage(String sessionId, String message,String storeId) throws IOException {
        logger.info("request session id is " + sessionId);
        Session session = null;
        for (Session s : SessionSet) {

            if (s.getId().equals(sessionId)) {
                session = s;
                break;
            }
        }
        if (session != null) {
            sendMessage(session, message,storeId);
            logger.info("sessionId:"+session.getId());
        } else {
            logger.warn("没有找到你指定ID的会话：{}", sessionId);
        }
    }

}