App({
  globalData: {
  socketStatus: 'closed',
  },
 onLaunch: function() { 
  var that = this;
  if (that.globalData.socketStatus === 'closed') {
    that.openSocket();
  }
 }
 openSocket() {
  //打開(kāi)時(shí)的動(dòng)作
  wx.onSocketOpen(() => {
   console.log('WebSocket 已連接')
   this.globalData.socketStatus = 'connected';
   this.sendMessage();
  })
  //斷開(kāi)時(shí)的動(dòng)作
  wx.onSocketClose(() => {
   console.log('WebSocket 已斷開(kāi)')
   this.globalData.socketStatus = 'closed'
  })
  //報(bào)錯(cuò)時(shí)的動(dòng)作
  wx.onSocketError(error => {
   console.error('socket error:', error)
  })
  // 監(jiān)聽(tīng)服務(wù)器推送的消息
  wx.onSocketMessage(message => {
   //把JSONStr轉(zhuǎn)為JSON
   message = message.data.replace(" ", "");
   if (typeof message != 'object') {
   message = message.replace(/\ufeff/g, ""); //重點(diǎn)
   var jj = JSON.parse(message);
   message = jj;
   }
   console.log("【websocket監(jiān)聽(tīng)到消息】?jī)?nèi)容如下：");
   console.log(message);
  })
  // 打開(kāi)信道
  wx.connectSocket({
   url: "ws://" + "localhost" + ":8888",
  })
  },
 //關(guān)閉信道
  closeSocket() {
  if (this.globalData.socketStatus === 'connected') {
   wx.closeSocket({
   success: () => {
    this.globalData.socketStatus = 'closed'
   }
   })
  }
  },
  //發(fā)送消息函數(shù)
  sendMessage() {
  if (this.globalData.socketStatus === 'connected') {
  //自定義的發(fā)給后臺(tái)識(shí)別的參數(shù) ，我這里發(fā)送的是name
   wx.sendSocketMessage({
   data: "{\"name\":\"" + wx.getStorageSync('openid') + "\"}" 
   })
  }
  },
})

<dependency>
 <groupId>org.java-websocket</groupId>
 <artifactId>Java-WebSocket</artifactId>
 <version>1.3.0</version>
</dependency>

 /**
  * 啟動(dòng)websocket
  */
 public void startWebsocketInstantMsg() {
  WebSocketImpl.DEBUG = false;
  MyWebScoket s;
  s = new MyWebScoket(8888);
  s.start();
  System.out.println("websocket啟動(dòng)成功");
 }

import com.alibaba.fastjson.JSONObject;
import org.java_websocket.WebSocket;
import org.java_websocket.handshake.ClientHandshake;
import org.java_websocket.server.WebSocketServer;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Map;
public class MyWebScoket extends WebSocketServer {
 public MyWebScoket() throws UnknownHostException {
  super();
 }
 public MyWebScoket(int port) {
  super(new InetSocketAddress(port));
 }
 public MyWebScoket(InetSocketAddress address) {
  super(address);
 }
 @Override
 public void onOpen(WebSocket conn, ClientHandshake handshake) {
  // ws連接的時(shí)候觸發(fā)的代碼，onOpen中我們不做任何操作
 }
 @Override
 public void onClose(WebSocket conn, int code, String reason, boolean remote) {
  //斷開(kāi)連接時(shí)候觸發(fā)代碼
  userLeave(conn);
  System.out.println(reason);
 }
 @Override
 public void onMessage(WebSocket conn, String message) {
  //有用戶連接進(jìn)來(lái)
  Map<String, String> obj = (Map<String,String>) JSONObject.parse(message);
  System.out.println(message);
  String username = obj.get("name");
  userJoin(conn, username);
 }
 @Override
 public void onError(WebSocket conn, Exception ex) {
  //錯(cuò)誤時(shí)候觸發(fā)的代碼
  System.out.println("on error");
  ex.printStackTrace();
 }
 /**
  * 去除掉失效的websocket鏈接
  */
 private void userLeave(WebSocket conn){
  WsPool.removeUser(conn);
 }
 /**
  * 將websocket加入用戶池
  * @param conn
  * @param userName
  */
 private void userJoin(WebSocket conn,String userName){
  WsPool.addUser(userName, conn);
 }
}

import com.td.yousan.util.StringUtils;
import org.java_websocket.WebSocket;
import java.util.*;
public class WsPool {
 private static final Map<WebSocket, String> wsUserMap = new HashMap<WebSocket, String>();
 /**
  * 通過(guò)websocket連接獲取其對(duì)應(yīng)的用戶
  */
 public static String getUserByWs(WebSocket conn) {
  return wsUserMap.get(conn);
 }
 /**
  * 根據(jù)userName獲取WebSocket,這是一個(gè)list,此處取第一個(gè)
  * 因?yàn)橛锌赡芏鄠€(gè)websocket對(duì)應(yīng)一個(gè)userName（但一般是只有一個(gè)，因?yàn)樵赾lose方法中，我們將失效的websocket連接去除了）
  */
 public static WebSocket getWsByUser(String userName) {
  Set<WebSocket> keySet = wsUserMap.keySet();
  synchronized (keySet) {
   for (WebSocket conn : keySet) {
    String cuser = wsUserMap.get(conn);
    if (cuser.equals(userName)) {
     return conn;
    }
   }
  }
  return null;
 }
 /**
  * 向連接池中添加連接
  */
 public static void addUser(String userName, WebSocket conn) {
  wsUserMap.put(conn, userName); // 添加連接
 }
 /**
  * 獲取所有連接池中的用戶，因?yàn)閟et是不允許重復(fù)的，所以可以得到無(wú)重復(fù)的user數(shù)組
  */
 public static Collection<String> getOnlineUser() {
  List<String> setUsers = new ArrayList<String>();
  Collection<String> setUser = wsUserMap.values();
  for (String u : setUser) {
   setUsers.add(u);
  }
  return setUsers;
 }
 /**
  * 移除連接池中的連接
  */
 public static boolean removeUser(WebSocket conn) {
  if (wsUserMap.containsKey(conn)) {
   wsUserMap.remove(conn); // 移除連接
   return true;
  } else {
   return false;
  }
 }
 /**
  * 向特定的用戶發(fā)送數(shù)據(jù)
  */
 public static void sendMessageToUser(WebSocket conn, String message) {
  if (null != conn && null != wsUserMap.get(conn)) {
   conn.send(message);
  }
 }
 /**
  * 向所有用戶名中包含某個(gè)特征得用戶發(fā)送消息
  */
 public static void sendMessageToSpecialUser(String message,String special) {
  Set<WebSocket> keySet = wsUserMap.keySet();
  if (special == null) {
   special = "";
  }
  synchronized (keySet) {
   for (WebSocket conn:keySet) {
    String user = wsUserMap.get(conn);
    try {
     if (user != null) {
      String [] cus = user.split("_");
      if (!StringUtils.isNullOrEmpty(cus[0])) {
       String cusDot = "," + cus[0] + ",";
       if (cusDot.contains(","+special+",")) {
         conn.send(message);
       }
      }else {
       conn.send(message);
      }
     }
    }catch (Exception e) {
     e.printStackTrace();
     //wsUserMap.remove(conn);
    }
   }
  }
 }
 /**
  * 向所有的用戶發(fā)送消息
  */
 public static void sendMessageToAll(String message) {
  Set<WebSocket> keySet = wsUserMap.keySet();
  synchronized (keySet) {
   for (WebSocket conn : keySet) {
    String user = wsUserMap.get(conn);
    if (user != null) {
     conn.send(message);
    }
   }
  }
 }
}