Runtime.exec("ftp") , but cann't read from Process.getInputStream()

first, Runtime.exec("ftp")
then I read from Process.getInputStream()
but I get nohting. why ?
I think I should read a prompt string "ftp>"
and, Process.getInputStream() return a BufferedInputStream, how can I get a non-buffered InputStream from it ?

Disregarding your actual question, I'll take a stab at the REAL issue.
If you're going to script an FTP session, why not use ftp -s:<filename>?

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