还是FTP客户端问题

    private void download_actionPerformed(ActionEvent e)  {
       System.out.println("下载");
        upload.setEnabled(true);

        String[] filenames = listServer.getSelectedItems();
        for(int i=0; i < filenames.length;i++) {
            String filename = filenames[i];
        System.out.println(filename);
        int ch;
        try {
            String str = path + "\\" +  filename;
            File localFile = new File(str);
            System.out.println(str);
            RandomAccessFile getFile = new RandomAccessFile(str,"rw");
            getFile.seek(0);
            System.out.println("ttt");
            TelnetInputStream ins = ftp.get(filename);
            System.out.println("fdss");
            System.out.println(ins);
            DataInputStream inputs = new DataInputStream(ins);
            while((ch =inputs.read()) >= 0) {
                getFile.write(ch);
            }
            ins.close();
            getFile.close();
            }
        catch (IOException ex) {
            ex.printStackTrace();
            }
        }
    }
    程序总是运行到TelnetInputStream ins = ftp.get(filename);卡死，下载到本地的文件只有文件名，大小为0；
    菜鸟求指教！！跪求大神！！

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自己顶起来。。。

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