UDP編程，發送圖片或文件

客戶端：
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class SendPicture {
public static void main(String[] args) throws Exception {
         DatagramSocket socket=new DatagramSocket(8880);
         InetAddress ia=InetAddress.getLocalHost();//傳給本身的ip
         //要發送給的服務器ip：InetAddress ia=InetAddress.getByName("192.168.10.62");
         DatagramPacket dp=null;
         InputStream is=new FileInputStream("e:\\aa\\DSC_7949.jpg");
         BufferedInputStream bs=new BufferedInputStream(is);
         byte[] a=new byte[1024];
         int len=-1;
         while((len=bs.read(a))!=-1){
         dp=new DatagramPacket(a, a.length,ia,8881);
         socket.send(dp);
         }
         is.close();
         socket.close();
}
}
服務端接收數據：
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class ReceverPicture {
public static void main(String[] args) throws Exception {
  DatagramSocket socket=new DatagramSocket(8881);
  byte[] b=new byte[1024];
  DatagramPacket dp=new DatagramPacket(b, b.length);
  OutputStream os=new FileOutputStream("e:\\DSC_7949.jpg");
  BufferedOutputStream bo=new BufferedOutputStream(os);
  int len=-1;
  while(b.length!=0){
 socket.receive(dp); 
 byte[] a=dp.getData();
 bo.write(a);
 bo.flush();
  }
  bo.close();
  os.close();
  socket.close();
}
}