Java Commons Net FTP在传输目录时失败，但可以在单个文件中工作

我有一个Commons Net FTP文件问题。我有一个应用程序，它可以将单个文件或目录传输到远程主机，具体取决于用户在JTree中单击的内容。当我传输特定目录时，在同一个文件上传输总是失败，并出现“软件导致的连接中止：套接字写入错误”。当我选择同一个文件并将其作为单个文件传输时，它工作正常。目录传输的相关代码为：

BufferedOutputStream bos = new BufferedOutputStream(os,8*1024);
if (filelen > 500){
buffer = new byte[(int) (filelen/100)];
}else {
buffer = new byte[(int) filelen];
}
int len; 
BufferedInputStream bis = new BufferedInputStream(is,8*1024);
int ba = bis.available();
while ((len = bis.read(buffer)) != -1 && ba != 0)  
{
//os.write(buffer, 0, len);
System.out.println(ftp.getReplyString());
System.out.println("len is "+len);
System.out.println("ba is "+ba);
System.out.println("first two bytes are "+buffer[0]+buffer[1]);
System.out.println("last byte is "+buffer[buffer.length-1]);
System.out.println("buffer length is "+buffer.length);
int rc = ftp.getReplyCode();
if (rc == 550){
hftstatus.setText("Copy Error encountered, check log.");
return;
}
bos.write(buffer,0, len);
bos.flush();
System.out.println(ftp.getReplyString());
ba = bis.available();
if (filelen > 500){
if (len > 0){
left -=len;
totleft -=len;
   }
}else{
left=0;
}
if (ba < buffer.length){
buffer = new byte[ba];
}
double ip = (left*100)/filelen;
int percomp =  (int) (100-ip);
double ap = (totleft*100)/totlength;
int perallcomp = (int) (100-ap);
hftcurrfileprog.setValue(percomp);
hftallfileprog.setValue(perallcomp);
hftstatus.setText("Copying file "+f+" "+percomp+" percent completed.");
                }

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任何想法或线索都将不胜感激。我找到了许多与此相近的方法，但没有一种方法的唯一区别在于目录或单个文件传输。谢谢你的帮助。

你真的应该在这里修改格式。请检查这个-我修正了我的格式。谢谢你给我指路，告诉我怎么做。

    BufferedOutputStream bos = new BufferedOutputStream(os,8*1024);
    if (filelen > 500){
    buffer = new byte[(int) (filelen/100)];
    }else {
    buffer = new byte[(int) filelen];
    }
    int len;
    while ((len = bis.read(buffer)) != -1)  
    {
        bos.write(buffer, 0, len);
        int rc = ftp.getReplyCode();
        if (rc == 550){hftstatus.setText("Copy Error encountered, check log.");}
        bos.flush();
        bytestran += len;
        if (filelen > 100){
        left = left-(filelen/100);
        }else{
            left=0;
        }
        double ip = (left*100)/filelen;
        int percomp =  (int) (100-ip);
        hftcurrfileprog.setValue(percomp);
        hftallfileprog.setValue(percomp);
        if (bytestran == filelen){break;}
        }
        String outm = ftp.getReplyString();
        System.out.println(outm);
        bos.flush();
        bos.close();
        bis.close();
        os.close();
        is.close();
        ftp.completePendingCommand();
        System.out.println(ftp.getReplyString());
        totleft = 0;
        double ip = (left*100)/filelen;
        int percomp =  (int) (100-ip);
        int perallcomp = 100;
        hftcurrfileprog.setValue(percomp);
        hftallfileprog.setValue(perallcomp);
        hftstatus.setText("file "+fnode+" copied to directory "+remoteDirPath+nwd);