网络编程（UDP协议-聊天程序）

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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;}@Overridepublic 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;}@Overridepublic 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>

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