🚀 go-pugleaf

congzb wrote:
> hello all
> see my program following:
> 
> 	public static void main(String args[]) {
> 		Socket socket = null;
> 		BufferedReader in = null;
> 		PrintWriter out = null;
> 		String line = null;
> 
> 		try {
> 			socket = new Socket("myserver", 21);
> 			in = new BufferedReader(new InputStreamReader(socket
> 					.getInputStream()));
> 			out = new PrintWriter(socket.getOutputStream());
> 			out.println("user " + "congzb");
> 			out.println("pass " + "1qazxsw2");
> 			out.println("pwd");
> 
> 			
> 			out.println("pasv");
> 			out.println("list");
> 
> 			out.println("quit");
> 			out.flush();
> 
> 			while ((line = in.readLine()) != null) {
> 				System.out.println(line);
> 			}
> 
> 		} catch (Exception e) {
> 			System.out.println(e.getMessage());
> 		} finally {
> 			try {
> 				out.close();
> 				in.close();
> 				socket.close();
> 			} catch (Exception fe) {
> 				System.out.println("RESOURCE CLOSE EXCEPTION "
> 						+ fe.getMessage());
> 			}
> 		}
> 	}
> 
> 
> 
> the trace info as following:
> 
> 331 Password required for congzb.
> 230-Last unsuccessful login: Fri Feb 17 02:21:26 EST 2006 on /dev/pts/1 from 9.186.23.101
> 230-Last login: Fri Feb 17 05:59:26 EST 2006 on ftp from ::ffff:9.186.23.101
> 230 User congzb logged in.
> 257 "/home/congzb" is current directory.
> 227 Entering Passive Mode (9,56,249,42,152,101)
> 
> 
> in fact, it hang on "pasv" command. and don't give me the answer of "list" command.
> 
> why? thanks

You need to have a PrintWriter for the socket error stream, as well as 
the output stream, or else you won't see any errors.

Also, you might get into some problems, because failure to promptly read 
from or write to those streams may cause them to block or deadlock.

The #2 posting on this page offers some guidance on the blocking issues.

http://java.ittoolbox.com/documents/popular-q-and-a/removing-the-dos-prompt-1773

-- 

Regards,

Lori Olson [TeamB]

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