package com.example.lxw.websocket;
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import com.alibaba.fastjson.JSONObject;
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import org.springframework.stereotype.Component;
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import javax.websocket.*;
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import javax.websocket.server.PathParam;
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import javax.websocket.server.ServerEndpoint;
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import java.io.IOException;
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import java.util.concurrent.ConcurrentHashMap;
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/**
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* @author niunafei
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* @function
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* @email niunafei0315@163.com
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* @date 2020/5/11 1:18 PM
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*/
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@ServerEndpoint("/imserver/{userId}")
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@Component
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public class WebSocketServer {
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/**
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* 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。
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*/
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private static int onlineCount = 0;
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/**
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* concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
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*/
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private static ConcurrentHashMap<String, WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
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/**
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* 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
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*/
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private Session session;
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/**
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* 接收userId
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*/
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private String userId = "";
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/**
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* 连接建立成功调用的方法
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*/
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@OnOpen
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public void onOpen(Session session, @PathParam("userId") String userId) {
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this.session = session;
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this.userId = userId;
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if (webSocketMap.containsKey(userId)) {
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webSocketMap.remove(userId);
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webSocketMap.put(userId, this);
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//加入set中
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} else {
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webSocketMap.put(userId, this);
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//加入set中
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addOnlineCount();
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//在线数加1
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}
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System.out.println("用户连接:" + userId + ",当前在线人数为:" + getOnlineCount());
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try {
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sendMessage("连接成功");
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} catch (IOException e) {
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System.out.println("用户:" + userId + ",网络异常!!!!!!");
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}
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}
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/**
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* 连接关闭调用的方法
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*/
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@OnClose
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public void onClose() {
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if (webSocketMap.containsKey(userId)) {
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webSocketMap.remove(userId);
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//从set中删除
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subOnlineCount();
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}
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System.out.println("用户退出:" + userId + ",当前在线人数为:" + getOnlineCount());
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}
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/**
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* 收到客户端消息后调用的方法
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*
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* @param message 客户端发送过来的消息
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*/
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@OnMessage
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public void onMessage(String message, Session session) throws IOException{
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String uid=this.userId;
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Thread thread=new Thread(){
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public void run(){
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while (true){
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System.out.println("用户消息:" + userId + ",报文:" + message);
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//可以群发消息
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//消息保存到数据库、redis
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if (message == null) {
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return;
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}
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try {
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//解析发送的报文
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JSONObject jsonObject = JSONObject.parseObject(message);
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//追加发送人(防止串改)
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jsonObject.put("fromUserId", uid);
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String toUserId = jsonObject.getString("toUserId");
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//传送给对应toUserId用户的websocket
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if (toUserId != null && webSocketMap.containsKey(toUserId)) {
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webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
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} else {
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System.out.println("请求的userId:" + toUserId + "不在该服务器上");
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//否则不在这个服务器上，发送到mysql或者redis
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}
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new Thread().sleep(2000);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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};
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thread.start();
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}
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/**
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* @param session
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* @param error
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*/
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@OnError
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public void onError(Session session, Throwable error) {
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System.out.println("用户错误:" + this.userId + ",原因:" + error.getMessage());
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error.printStackTrace();
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}
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/**
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* 实现服务器主动推送
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*/
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public void sendMessage(String message) throws IOException {
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this.session.getBasicRemote().sendText(message);
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}
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/**
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* 发送自定义消息
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*/
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public static void sendInfo(String message, @PathParam("userId") String userId) throws IOException {
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System.out.println("发送消息到:" + userId + "，报文:" + message);
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if (userId != null && webSocketMap.containsKey(userId)) {
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webSocketMap.get(userId).sendMessage(message);
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} else {
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System.out.println("用户" + userId + ",不在线！");
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}
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}
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public static synchronized int getOnlineCount() {
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return onlineCount;
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}
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public static synchronized void addOnlineCount() {
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WebSocketServer.onlineCount++;
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}
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public static synchronized void subOnlineCount() {
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WebSocketServer.onlineCount--;
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}
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}
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