tcp编程：聊天室中的私聊

package com.sundear.demo.chat5;

import com.sundear.demo.chat3.SxtUtils;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * 在线聊天室：服务器
 * 群聊
 * 多线程
 */
public class Chat {
    //高并发容器 线程安全
    private static CopyOnWriteArrayList<Channel> all =new CopyOnWriteArrayList<Channel>();

    public static void main(String[] args) throws IOException {
        System.out.println("----server----");
        ServerSocket server = new ServerSocket(8888);
        while(true){
            Socket client = server.accept();
            System.out.println("一个客户建立了连接");
            Channel c = new Channel(client);
            all.add(c);//管理所有的成员
            new Thread(c).start();
        }

    }
    //一个客户等于一个Channel
    static class Channel implements Runnable{
        private DataInputStream dis;
        private DataOutputStream dos;
        private Socket client;
        private boolean isRunning ;
        private String name;
        public Channel(Socket client){
          this.client =client;
            try {
                dis =new DataInputStream(client.getInputStream());
                dos =new DataOutputStream(client.getOutputStream());
                isRunning =true;
                //获取名称
                this.name = receive();
                this.send("欢迎你的到来");
                sendOthers(this.name+"来了nono聊天室",true);
            } catch (IOException e) {
                release();
            }


        }
        //接收消息
        private String receive(){
            String msg="";
            try {
                msg = dis.readUTF();
            } catch (IOException e) {
                System.out.println("----2---");
                release();
            }
            return msg;
        }
        //发送消息
        private void send(String msg){
            try {
                dos.writeUTF(msg);
            } catch (IOException e) {
                System.out.println("---3----");
                release();
            }
        }

        //群聊

        /**
         * 私聊
         * @param msg
         * @param isSys
         */
        private void sendOthers(String msg,Boolean isSys){
            Boolean isPrivate =msg.startsWith("@");
            if(isPrivate){
                //获取目标
                int idx=msg.indexOf(":");
                String targetName =msg.substring(1,idx);
                msg =msg.substring(idx+1);
                for(Channel other:all){
                    if(other.name.equals(targetName)){
                        other.send(this.name+"悄悄说:"+msg);
                    }
                    break;
                }
            }else {
                for (Channel other : all) {
                    if (other == this) {
                        continue;
                    }
                    if (!isSys) {
                        other.send(this.name + ":" + msg);//群聊消息
                    } else {
                        other.send(msg);//系统消息
                    }

                }
            }
        }

        //释放资源
        private void release(){
            this.isRunning =false;
            SxtUtils.close(dis,dos,client);
            all.remove(this);
            sendOthers(this.name+"离开了nono聊天室",true);
        }



    @Override
    public void run() {
        while(isRunning) {
            String msg=receive();
            if(!msg.equals("")){
                //send(msg);
                sendOthers(msg,false);
            }
        }
    }
}
}
结合上一篇博客