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java服务端基础知识25
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package com.mes.util;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
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.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import com.google.gson.JsonObject;
import net.sf.json.JSONObject;
@ServerEndpoint("/webSocket/{username}")
public class WebSocket {
private static int onlineCount = 0;
private static Map
private Session session;
private String username;
@OnOpen
public void onOpen(@PathParam("username") String username, Session session) throws IOException {
this.username = username;
this.session = session;
addOnlineCount();
clients.put(username, this);
System.out.println("已连接");
}
@OnClose
public void onClose() throws IOException {
clients.remove(username);
subOnlineCount();
}
@OnMessage
public void onMessage(String message) throws IOException {
JSONObject jsonTo = JSONObject.fromObject(message);
String mes = (String) jsonTo.get("message");
if (!jsonTo.get("To").equals("All")){
sendMessageTo(mes, jsonTo.get("To").toString());
}else{
sendMessageAll("给所有人");
}
}
@OnError
public void onError(Session session, Throwable error) {
error.printStackTrace();
}
public void sendMessageTo(String message, String To) throws IOException {
// session.getBasicRemote().sendText(message);
//session.getAsyncRemote().sendText(message);
for (WebSocket item : clients.values()) {
if (item.username.equals(To) )
item.session.getAsyncRemote().sendText(message);
}
}
public void sendMessageAll(String message) throws IOException {
for (WebSocket item : clients.values()) {
item.session.getAsyncRemote().sendText(message);
}
}
public static synchronized int getOnlineCount() {
return onlineCount;
}
public static synchronized void addOnlineCount() {
WebSocket.onlineCount++;
}
public static synchronized void subOnlineCount() {
WebSocket.onlineCount--;
}
public static synchronized Map
return clients;
}
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