JAVA 网络编程 UDP（聊天程序）

参看：点击打开链接

/*
编写一个简易的聊天程序
*/

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

class Send implements Runnable
{
	private DatagramSocket ds;
	public Send(DatagramSocket ds)
	{
		this.ds = ds;
	}
	
	public void run()
	{
		try
		{
			BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));

			String line = null;

			while((line = bufr.readLine())!= null)
			{
				//设置退出条件
				if( "886".equals(line))
					break;

				byte [] buf = line.getBytes();
				DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("127.0.0.1"),1000);

				ds.send(dp);
			}
		}
		catch (IOException e)
		{
			throw new RuntimeException("消息发送失败！");
		}
	}
}

class Recv implements Runnable
{	
	private DatagramSocket ds;
	public Recv(DatagramSocket ds)
	{
		this.ds = ds;
	}

	public void run()
	{
		try
		{
			while(true)
			{
				//设置缓冲区
				byte [] buf = new byte[1024];
				DatagramPacket dp = new DatagramPacket(buf,buf.length);
				
				ds.receive(dp);

				//获取发送方的IP
				String ip = dp.getAddress().getHostAddress();

				//获取数据
				String data = new String(dp.getData(),0,dp.getLength());

				System.out.println(ip +"::" + data);
			}
		}
		catch (Exception e)
		{
			throw new RuntimeException("消息接收失败！");
		}
	}
}

class ChatDemo
{
	public static void main(String []args) throws Exception
	{
		DatagramSocket sendSocket = new DatagramSocket();
		DatagramSocket recvSocket = new DatagramSocket(1000);

		new Thread(new Send(sendSocket)).start();
		new Thread(new Recv(recvSocket)).start();
	}
}