用java实现ftp下载文件,当字节数超过10000时运行就会停止,  
下载部分代码如下:BufferedReader bufGet = f.getAscii(stringBuffer);
File   outfile   =   new   File("E://outgoing/qbzq",  stringBuffer);
  f.getAscii(stringBuffer);
    
  System.out.println(f.command);      
      System.out.print(f.getResponseString());      
      PrintWriter pOut = new PrintWriter(new BufferedWriter(new FileWriter(outfile)));
 
     int i; (好像是这个i不能超10000)                               
     char c[] = new char[4096000];
      while ((i = bufGet.read(c)) != -1) 
     pOut.write(c,0,i);                                                   
    bufGet.close();
    pOut.close();            
     
      System.out.print(f.getResponseString());
用什么方法来下载好呢 ?