利用多线程实现聊天室的功能

当服务器收到来自一个客户端的消息后，群发给所有的客户端！
服务器主动下推！
1服务器具有客户端列表，clientPoolr
2客户端必须创建一个子线程，不断接收服务器下发的消息

//和指定客户端对话线程
class ClientChatThread extends Thread{
	private Socket client;

	public ClientChatThread(Socket client) {
		super();
		this.client = client;
	}
	//将消息群发给所有人
	private void sendAll(String str){
		for(ClientChatThread ct:CustomThreadPoolAutoReplyTcpServer.pool){
			try {
				DataOutputStream dos = new DataOutputStream(ct.client.getOutputStream());
				dos.writeUTF(str);
			} catch (Exception e) {
				System.out.println("发送给客户端["+ct.client.getPort()+"]失败，有可能断开了");
			}
		}
	}
	//和一个客户端对话的过程
	@Override
	public void run() {
		try {
			DataOutputStream dos = new DataOutputStream(client.getOutputStream());
			DataInputStream dis = new DataInputStream(client.getInputStream());
			while (true) {
				//加try是为了防止，客户端断开连接出现异常
				try {
					// 用这个流去封装输入流
					String str = dis.readUTF();// 直接读取字符串
					System.out.println(str);
					//将群发消息发给线程中的所有客户端
					// 把数据群发过去
					sendAll(str);
				} catch (Exception e) {
					System.out.println("与客户端[" + client.getPort() + "]断开连接");
					//删除不能连接的线程
					CustomThreadPoolAutoReplyTcpServer.pool.remove(this);
					System.out.println("客户端连接数："+CustomThreadPoolAutoReplyTcpServer.pool.size());
					break;
				}
			} 
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}
//自定义线程池实现客户端多线程自动回复
public class CustomThreadPoolAutoReplyTcpServer {
	public static 	Vector<ClientChatThread> pool=new Vector<>();//线程池，全局唯一
	public static void main(String[] args) throws IOException {
		ServerSocket ss = new ServerSocket(6667);
		System.out.println("服务器端在6666端口启动成功,等待客户端连接...");	
		while (true) {
			// 启动监听
			Socket client = ss.accept();
			System.out.println("客户端[" + client.getPort() + "]连接成功");
			ClientChatThread ct=new ClientChatThread(client);
			pool.add(ct);//放到线程池中
			System.out.println("客户端连接数："+pool.size());
			ct.start();//启动线程
		}
	}
}

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

class ReceiverServerThread extends Thread{
	private Socket client;
	
	public ReceiverServerThread(Socket client) {
		super();
		this.client = client;
	}
	@Override
	public void run() {
		DataInputStream dis =null;
		try {
			dis = new DataInputStream(client.getInputStream());
		} catch (Exception e) {
			e.printStackTrace();
			return;
		}
		while(true){
			
			String response;
			try {
				response = dis.readUTF();
				System.out.println(response);//读取服务器内容
			} catch (IOException e) {
				System.out.println("被服务器断开连接了!");
				return;
			}
			
		}
	}
}
public class MultiplyPeopleTcpClient {
	public static void main(String[] args) throws UnknownHostException, IOException {
		System.out.println("请输入用户名：");
		Scanner sc=new Scanner(System.in);
		String name=sc.nextLine();
		Socket client=new Socket("127.0.0.1",6667);
		System.out.println("连接服务器127.0.0.1成功");
		//创建线程不断接收服务的信息
		new ReceiverServerThread(client).start();
		DataOutputStream dos = new DataOutputStream(client.getOutputStream());
		String str="";
		while(!"quit".equals(str=sc.nextLine())){
			dos.writeUTF(name+":"+str);//将控制台内容写入服务器中
		}
		client.close();//断开服务器的连接
	}
}