java websocket服务端实现，含心跳机制

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websocket连接类

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package com.dnn.controller.inter;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.CloseReason;
import javax.websocket.CloseReason.CloseCodes;
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 org.apache.http.impl.entity.EntitySerializer;

import com.dnn.entity.WebSocketEntity;
import com.dnn.model.TbAdminMember;
import com.dnn.service.TbAdminMemberService;
import com.dnn.service.TbDataGrouprecordService;
import com.dnn.utils.jfinal.BaseController;
import com.jfinal.aop.Clear;

import net.sf.json.JSONObject;

@Clear
@ServerEndpoint("/webSocket/{userId}")
public class WebSocketCon