使用Java FTP连接到Localhost

Question

I'm developing FTP program on JAVA. I'm using Apache Commons Net Library. My Codes are below.

 import java.io.IOException; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPReply; public class ServerClass { private static void showServerReply(FTPClient ftpClient) { String[] replies = ftpClient.getReplyStrings(); if (replies != null && replies.length > 0) { for (String aReply : replies) { System.out.println("SERVER: " + aReply); } } } public static void main(String[] args) { String server = "127.0.0.1"; int port = 80; String user = "root"; String pass = "root"; FTPClient ftpClient = new FTPClient(); try { ftpClient.connect(server, port); showServerReply(ftpClient); int replyCode = ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(replyCode)) { System.out.println("Operation failed. Server reply code: " + replyCode); return; } boolean success = ftpClient.login(user, pass); showServerReply(ftpClient); if (!success) { System.out.println("Could not login to the server"); return; } else { System.out.println("LOGGED IN SERVER"); } } catch (IOException ex) { System.out.println("Oops! Something wrong happened"); ex.printStackTrace(); } } } 

But I can't connect my localhost. I want to login my localhost and see my file. My errors are below.

 Oops! Something wrong happened java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at org.apache.commons.net.SocketClient.connect(SocketClient.java:188) at org.apache.commons.net.SocketClient.connect(SocketClient.java:209) at com.emrecanoztas.ftp.ServerClass.main(ServerClass.java:22) 

can you help me anybody? Thanks!..

Answer 1

Questions:

• Is there an FTP server running?
• Is there a message in the FTP server log about the connect request?
• Does the FTP server allow connections from localhost?
• Is the FTP server listening on localhost or should you use the public IP/name of the computer? (check with netstat)

Answer 2

Try the settings below.

  String server = "ftp.icm.edu.pl"; int port = 21; String user = "anonymous"; String pass = "me@nowhere.com";