用UDP实现简单的聊天功能

package com.hbsi.net;


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


public class Chat{
public static void main(String[] args) {
Send s=new Send();
Receive r=new Receive();
Thread ts=new Thread(s);
Thread tr=new Thread(r);
ts.start();
tr.start();
}
}



//发送
class Send implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub


DatagramSocket ds;
BufferedReader br;
try {
ds = new DatagramSocket();

br=new BufferedReader(new InputStreamReader(System.in));

String line=null;
String line2=InetAddress.getLocalHost().toString();
while((line=br.readLine())!=null){
System.out.print(line2+"\n　　　　");
if(line.equals("886")){
break;
}
byte[] buf=line.getBytes();
DatagramPacket dp=new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.49.255【接受信息人的IP】"),9009);
ds.send(dp);
}
ds.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

//接收
class Receive implements Runnable{

public void run() {
while(true){
DatagramSocket ds;
try {
ds = new DatagramSocket(9009);
while(true){
byte[] buf=new byte[1024];
DatagramPacket dp=new DatagramPacket(buf, buf.length);

ds.receive(dp);

String ip=dp.getAddress().getHostAddress();
String data=new String(dp.getData()).trim();

System.out.println("\n"+ip+"--"+data);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}