利用多线程进行聊天

    

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Scanner;


class Send implements Runnable
{
    private DatagramSocket s;
    Send(DatagramSocket s)
    {
    	this.s=s;
    }
	public void run()
	{
		while(true)
		{
	       String text=null;
		   Scanner sc=new Scanner(System.in);
		   text=sc.nextLine();
		   if(text.equals("886"))
		   {
			   break;
		   }
		   InetAddress ip;
		  try 
		  {
			ip = InetAddress.getByName("127.0.0.1");
			DatagramPacket dp=new DatagramPacket(text.getBytes("GBK"),0,text.length(),ip,6003);
			s.send(dp);
		  }
		  catch (UnknownHostException e) 
		  {
			e.printStackTrace();
		  } 
		  catch (IOException e) 
		  {
			e.printStackTrace();
		  }
		   
		}
		
	}
	
}

class Rev implements Runnable
{

	private DatagramSocket s;
	Rev(DatagramSocket s)
    {
	    	this.s=s;
	}
	public void run()
	{
		while(true)
		{
			//定义接收数据的缓冲区和长度
			byte text[]=new byte[1024];
			//用来接收数据的数据包
			DatagramPacket p=new DatagramPacket(text,1024);
			while(true)
			{
			    //接收数据
			   try 
			   {
				  s.receive(p);
			   } 
			   catch (IOException e) 
			   {
				e.printStackTrace();
			   }
			   //显示接收到的数据
			   String a;
			try {
				a = new String(p.getData(),0,p.getLength(),"GBK");
				System.out.println("接收到"+p.getAddress().getHostName()+"的消息");
				System.out.println(a);
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
			  
			}
		}
		
	}
	
}
public class Chat
{
   public static void main(String args[]) throws SocketException
   {
	   DatagramSocket a=new DatagramSocket(6003);
	   DatagramSocket b=new DatagramSocket();
	   
	   new Thread(new Send(b)).start();
	   new Thread(new Rev(a)).start();
	   
   }
}