package com.example.springboot.component;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import javax.websocket.OnClose;
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import javax.websocket.OnError;
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import javax.websocket.OnMessage;
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import javax.websocket.OnOpen;
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import javax.websocket.Session;
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import javax.websocket.server.PathParam;
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import javax.websocket.server.ServerEndpoint;
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import org.springframework.stereotype.Component;
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import cn.hutool.json.JSONObject;
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import cn.hutool.json.JSONUtil;
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@ServerEndpoint(value = "/api/talk/{username}")
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@Component
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public class WebSocketServer {
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private static final Logger log = LoggerFactory.getLogger(WebSocketServer.class);
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/**
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* 记录当前在线连接数
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*/
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public static final Map<String, WebSocketServer> sessionMap = new ConcurrentHashMap<>();
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private String username;
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private Session session;
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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("username") String username) {
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this.username=username;
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this.session=session;
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sessionMap.put(username, this);
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log.info("有新用户加入，username={}, 当前在线人数为：{}", username, sessionMap.size());
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// JSONObject result = new JSONObject();
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// JSONArray array = new JSONArray();
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// result.set("users", array);
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// for (Object key : sessionMap.keySet()) {
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// JSONObject jsonObject = new JSONObject();
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// jsonObject.set("username", key);
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// array.add(jsonObject);
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// }
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//sendAllMessage(JSONUtil.toJsonStr(result)); // 后台发送消息给所有的客户端
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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(Session session, @PathParam("username") String username) {
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sessionMap.remove(username);
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log.info("有一连接关闭，移除username={}的用户session, 当前在线人数为：{}", username, sessionMap.size());
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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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* 后台收到客户端发送过来的消息
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* onMessage 是一个消息的中转站
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* 接受 浏览器端 socket.send 发送过来的 json数据
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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, @PathParam("username") String username) {
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log.info("服务端收到用户username={}的消息:{}", username, message);
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JSONObject obj = JSONUtil.parseObj(message);
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String text = obj.getStr("data");
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JSONObject jsonObject = new JSONObject();
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jsonObject.set("message", "ngng");
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this.sendMessage(jsonObject.toString()); //JSONUtil.toJsonStr(jsonObject)
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}
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@OnError
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public void onError(Session session, Throwable error) {
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log.error("发生错误");
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error.printStackTrace();
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}
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/**
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* 服务端发送消息给客户端
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*/
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public void sendMessage(String message) {
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try {
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log.info("服务端给客户端[{}]发送消息{}", this.session.getId(), message);
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this.session.getBasicRemote().sendText(message);
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} catch (Exception e) {
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log.error("服务端发送消息给客户端失败", e);
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}
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}
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/**
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* 服务端发送消息给所有客户端
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*/
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public void sendAllMessage(String message) {
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try {
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for (WebSocketServer webSocketServer : sessionMap.values()) {
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log.info("服务端给客户端[{}]发送消息{}", this.session.getId(), message);
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webSocketServer.sendMessage(message);
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}
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} catch (Exception e) {
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log.error("服务端发送消息给客户端失败", e);
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}
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}
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}
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