package boot.spring.service;
import java.io.IOException;
import java.util.Date;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
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 com.alibaba.fastjson.JSON;
import boot.spring.po.Message;
@ServerEndpoint("/webSocket/{username}")
@Component
public class WebSocketServer {
//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。
private static AtomicInteger onlineNum = new AtomicInteger();
//concurrent包的线程安全Set,用来存放每个客户端对应的WebSocketServer对象。
private static ConcurrentHashMap<String, Session> sessionPools = new ConcurrentHashMap<>();
//发送消息
public void sendMessage(Session session, String message) throws IOException {
if(session != null){
synchronized (session) {
System.out.println("发送数据:" + message);
session.getBasicRemote().sendText(message);
}
}
}
//给指定用户发送信息
public void sendInfo(String userName, String message){
Session session = sessionPools.get(userName);
try {
sendMessage(session, message);
}catch (Exception e){
e.printStackTrace();
}
}
// 群发消息
public void broadcast(String message){
for (Session session: sessionPools.values()) {
try {
sendMessage(session, message);
} catch(Exception e){
e.printStackTrace();
continue;
}
}
}
//建立连接成功调用
@OnOpen
public void onOpen(Session session, @PathParam(value = "username") String userName){
sessionPools.put(userName, session);
addOnlineCount();
System.out.println(userName + "加入webSocket!当前人数为" + onlineNum);
// 广播上线消息
Message msg = new Message();
msg.setDate(new Date());
msg.setTo("0");
msg.setText(userName);
broadcast(JSON.toJSONString(msg,true));
}
//关闭连接时调用
@OnClose
public void onClose(@PathParam(value = "username") String userName){
sessionPools.remove(userName);
subOnlineCount();
System.out.println(userName + "断开webSocket连接!当前人数为" + onlineNum);
// 广播下线消息
Message msg = new Message();
msg.setDate(new Date());
msg.setTo("-2");
msg.setText(userName);
broadcast(JSON.toJSONString(msg,true));
}
//收到客户端信息后,根据接收人的username把消息推下去或者群发
// to=-1群发消息
@OnMessage
public void onMessage(String message) throws IOException{
System.out.println("server get" + message);
Message msg=JSON.parseObject(message, Message.class);
msg.setDate(new Date());
if (msg.getTo().equals("-1")) {
broadcast(JSON.toJSONString(msg,true));
} else {
sendInfo(msg.getTo(), JSON.toJSONString(msg,true));
}
}
//错误时调用
@OnError
public void onError(Session session, Throwable throwable){
System.out.println("发生错误");
throwable.printStackTrace();
}
public static void addOnlineCount(){
onlineNum.incrementAndGet();
}
public static void subOnlineCount() {
onlineNum.decrementAndGet();
}
public static AtomicInteger getOnlineNumber() {
return onlineNum;
}
public static ConcurrentHashMap<String, Session> getSessionPools() {
return sessionPools;
}
}