public class jieshou {

    /**
     * @param args
     * @throws SocketException 
     * @throws IOException 
     */
    public static void main(String[] args) throws SocketException, Exception {
        // TODO Auto-generated method stub
         DatagramSocket socket;   
         socket = new DatagramSocket(10000);
         byte[] buf = new byte[108421];   
            OutputStream fos = new BufferedOutputStream(new FileOutputStream("C:\\Users\\Administrator\\Desktop\\jieshou.jpg"));
         while(true)
         {
           DatagramPacket packet = new DatagramPacket(buf,108421); 
           
           try{   
               socket.receive(packet);
               fos.write(packet.getData(), 0, packet.getLength());  
              }
           catch (Exception e1)     
           {
               try{
               socket.close();   
               fos.flush();   
               fos.close();  
           }catch(Exception iee){System.out.println("close :"+e1);} 
           }   
           break;
               
       } 
          System.out.println("server_finish");
         }
    }

package com.ssj.test;

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class Test {
    public static void main(String[] args) throws SocketException, Exception {
        // TODO Auto-generated method stub
        DatagramSocket socket;
        socket = new DatagramSocket(10000);
        byte[] buf = new byte[108421];
        OutputStream fos = new BufferedOutputStream(new FileOutputStream(
                "f:/temp/jieshou.jpg"));
        while (true) {
            DatagramPacket packet = new DatagramPacket(buf, 108421);

            try {
                socket.receive(packet);
                fos.write(packet.getData(), 0, packet.getLength());
            } catch (Exception e1) {
                try {
                    socket.close();
                    fos.flush();
                    fos.close();
                } catch (Exception iee) {
                    System.out.println("close :" + e1);
                }
            }
            break;

        }
        System.out.println("server_finish");
    }
}

------解决方案--------------------
这个是网络和机器决定的ip包最大包长  
tcp/ip协议为64k   你一下传200K还不挂？
>64K要分包的嘛，我了个去