网络编程（UDP协议-聊天程序）

网络编程中的UDP协议中聊天程序，发送端口，和接受端口。

发送端口（Send）:

<span style="font-size:18px;">package cn.itcast.net.p3.chat;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class Send implements Runnable{
	private DatagramSocket ds;

	public Send(DatagramSocket ds){
		this.ds=ds;
	}
	@Override
	public void run(){
		try{
			BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
		    String line = null;
		    while((line=bufr.readLine())!=null){
		    	  byte[] buf = line.getBytes();
		    	  DatagramPacket dp =
		    			  new DatagramPacket(buf, buf.length,InetAddress.getByName("192.168.3.5"),1001);
		    ds.send(dp);
		    if("886".equals(line))
		    	break;
		    }
		}catch(Exception e){
	}

	}
}</span>

接受端口（Rece）:

<span style="font-size:18px;">package cn.itcast.net.p3.chat;

import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class Rece implements Runnable {
	private DatagramSocket ds;
	public Rece(DatagramSocket ds){
		this.ds = ds;
	}
	@Override
	public void run() {
		try {
			while(true){
				//2、创建数据包
				byte[] buf = new byte[1024];
				DatagramPacket dp = new DatagramPacket(buf,buf.length);
				//3、使用接收方法将数据存储到数据包中
				ds.receive(dp); //阻塞式的
				//4、通过数据包对象方法，解析其中的数据
				String ip = dp.getAddress().getHostAddress();
				int port = dp.getPort();
				String text = new String(dp.getData(),0,dp.getLength());

				System.out.println(ip+":"+text);
				if(text.equals("886")){
					System.out.println(ip+".....退出聊天室");
				}
			}
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
} </span>