实现的一个聊天程序

import java.io.*;
import java.net.*;

class Listen implements Runnable
{
	Socket s;
	
	Listen(Socket s)
	{
		this.s=s;
	}
	public void run()
	{
		String ip=s.getInetAddress().getHostAddress();
		while(true)
		{
			
			try
			{
				BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
				String str=br.readLine();
				System.out.println(ip+"Client Say:");
				System.out.println(str);
			}
			catch (Exception e){}
		}
	}
}


class Write implements Runnable
{
	Socket s;
	Write(Socket s)
	{
		this.s=s;
	}
	public void run()
	{
		try
		{
			while(true)
			{
				PrintWriter out=new PrintWriter(s.getOutputStream(),true);
				BufferedReader br1=new BufferedReader(new InputStreamReader(System.in));
				String str1=br1.readLine();
				out.println(str1);
			}
		}
		catch(Exception e){}
	}
}


public class Server {
	public static void main(String[] args)throws SocketException,IOException  
		{
			ServerSocket sc=new ServerSocket(12000);
			Socket ss=sc.accept();
			
			new Thread(new Listen(ss)).start();
			new Thread(new Write(ss)).start();	
		}
}

import java.io.*;
import java.net.*;

class Listen1 implements Runnable
{
	Socket s;
	Listen1(Socket s)
	{
		this.s=s;
	}
	public void run()
	{
		while(true)
		{
			
			try
			{
				BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
				String str=br.readLine();
				System.out.println("Server Say:");
				System.out.println(str);
			}
			catch (Exception e){}
		}
	}
}


class Write1 implements Runnable
{
	Socket s;
	Write1(Socket s)
	{
		this.s=s;
	}
	public void run()
	{
		try
		{
			while(true)
			{
				PrintWriter out=new PrintWriter(s.getOutputStream(),true);
				BufferedReader br1=new BufferedReader(new InputStreamReader(System.in));
				String str1=br1.readLine();
				out.println(str1);
			}
		}
		catch(Exception e){}
	}
}


public class Client
{
	public static void main(String[] args)throws Exception 
	{
		Socket s=new Socket("172.16.99.99",12000);  

		new Thread(new Listen1(s)).start();//读取信息线程
		new Thread(new Write1(s)).start();//发送信息线程
	}
}