Thanks for replying.
Here is the program I was trying to use. You can input
your login and password in main below, if you wish to
run it.
thanks,
Anil
===========================
import javax.swing.*;
import javax.swing.plaf.basic.BasicArrowButton;
import org.apache.commons.net.ProtocolCommandEvent;
import org.apache.commons.net.ProtocolCommandListener;
import org.apache.commons.net.ftp.FTPClient;
import
org.apache.commons.net.ftp.FTPConnectionClosedException;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.io.PrintWriter;
public class RemoteFilesListDialog extends JDialog
implements ActionListener {
private static RemoteFilesListDialog dialog;
private static String value = "";
private JList list;
DefaultListModel model = new DefaultListModel();
String server, username, password;
static FTPClient ftp;
JTextField fileName = new JTextField(15);
/**
* Set up and show the dialog. The first Component
argument determines which
* frame the dialog depends on; it should be a
component in the dialog's
* controlling frame. The second Component argument
should be null if you
* want the dialog to come up with its left corner in
the center of the
* screen; otherwise, it should be the component on
top of which the dialog
* should appear.
* @param function TODO
* @throws IOException
*/
public static String showDialog(Component frameComp,
Component locationComp, String labelText, String
title, String server, String user, String password,
String function) throws IOException {
Frame frame =
JOptionPane.getFrameForComponent(frameComp);
if(JOptionPane.showConfirmDialog(frameComp,
"Press OK to Browse for it at " + server + "\nIt
may take up to 15 seconds to connect to the server.",
"Selecting", JOptionPane.OK_CANCEL_OPTION) ==
JOptionPane.YES_OPTION) {
RemoteFilesListDialog.connect(server,user,password);
} else
return null;
if(dialog == null) {
dialog = new RemoteFilesListDialog(frame,
locationComp, labelText, title, function);
}
RemoteFilesListDialog.value = null;
dialog.repopulateList();
dialog.setVisible(true);
return value;
}
private void repopulateList() {
String[] files;
try {
model.clear();
files = ftp.listNames();
for (int i = 0; i < files.length; i++) {
if(files[i].endsWith(".html"))
model.addElement(files[i]);
}
} catch (IOException e) {
JOptionPane.showMessageDialog(null, e);
e.printStackTrace();
}
}
private RemoteFilesListDialog(Frame frame, Component
locationComp, String labelText,
String title, String function) {
super(frame, title, true);
// Create and initialize the buttons.
JButton cancelButton = new JButton("Cancel");
cancelButton.addActionListener(this);
//
final JButton setButton = new JButton("Select");
setButton.setActionCommand("Select");
setButton.addActionListener(this);
getRootPane().setDefaultButton(setButton);
// main part of the dialog
list = new JList(model) {
// Subclass JList to workaround bug 4832765, which
can cause the
// scroll pane to not let the user easily scroll up
to the beginning
// of the list. An alternative would be to set the
unitIncrement
// of the JScrollBar to a fixed value. You wouldn't
get the nice
// aligned scrolling, but it should work.
public int getScrollableUnitIncrement(Rectangle
visibleRect,
int orientation, int direction) {
int row;
if (orientation == SwingConstants.VERTICAL &&
direction < 0
&& (row =
getFirstVisibleIndex()) != -1) {
Rectangle r = getCellBounds(row, row);
if ((r.y == visibleRect.y) && (row !=
0)) {
Point loc = r.getLocation();
loc.y--;
int prevIndex =
locationToIndex(loc);
Rectangle prevR =
getCellBounds(prevIndex,
prevIndex);
if (prevR == null || prevR.y >=
r.y) {
return 0;
}
return prevR.height;
}
}
return
super.getScrollableUnitIncrement(visibleRect,
orientation, direction);
}
};
list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
list.setLayoutOrientation(JList.HORIZONTAL_WRAP);
list.setVisibleRowCount(-1);
list.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
setButton.doClick(); // emulate button
click
}
}
});
JScrollPane listScroller = new JScrollPane(list);
listScroller.setPreferredSize(new Dimension(250,
80));
listScroller.setAlignmentX(LEFT_ALIGNMENT);
// Create a container so that we can add a title
around
// the scroll pane. Can't add a title directly to
the
// scroll pane because its background would be
white.
// Lay out the label and scroll pane from top to
bottom.
JPanel listPane = new JPanel();
listPane.setLayout(new BoxLayout(listPane,
BoxLayout.PAGE_AXIS));
JLabel label = new JLabel(labelText);
label.setLabelFor(list);
listPane.add(label);
listPane.add(Box.createRigidArea(new Dimension(0,
5)));
listPane.add(listScroller);
listPane.setBorder(BorderFactory.createEmptyBorder(10,
10, 10, 10));
if(function.equals("Save"))
listPane.add(fileName);
// Lay out the buttons from left to right.
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new BoxLayout(buttonPane,
BoxLayout.LINE_AXIS));
buttonPane.setBorder(BorderFactory.createEmptyBorder(0,
10, 10, 10));
buttonPane.add(Box.createHorizontalGlue());
buttonPane.add(cancelButton);
buttonPane.add(Box.createRigidArea(new Dimension(10,
0)));
buttonPane.add(setButton);
// Put everything together, using the content pane's
BorderLayout.
Container contentPane = getContentPane();
contentPane.add(listPane, BorderLayout.CENTER);
contentPane.add(buttonPane, BorderLayout.PAGE_END);
pack();
setLocationRelativeTo(locationComp);
}
// Handle clicks on the Select and Cancel buttons.
public void actionPerformed(ActionEvent e) {
if ("Select".equals(e.getActionCommand())) {
String selected = (String)
(list.getSelectedValue());
if(selected == null) {
selected = fileName.getText();
if(!selected.endsWith(".html"))
selected = selected + ".html";
}
RemoteFilesListDialog.value = selected;
}
RemoteFilesListDialog.dialog.setVisible(false);
try {
if (ftp.isConnected())
ftp.disconnect();
} catch (IOException e1) {
JOptionPane.showMessageDialog(null, e1);
e1.printStackTrace();
}
}
public static void connect(String server, String
username, String password) throws IOException {
ftp = new FTPClient();
ftp.addProtocolCommandListener(new
PrintingCommandListener(
new PrintWriter(System.out)));
try {
int reply;
ftp.connect(server);
System.out.println("Connected to " + server + ".");
// After connection attempt, you should check the
reply code to
// verify
// success.
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
System.err.println("FTP server refused
connection.");
JOptionPane.showMessageDialog(null,"FTP server
refused connection.");
}
} catch (IOException e) {
if (ftp.isConnected()) {
try {
ftp.disconnect();
} catch (IOException e1) {
throw e1;
}
}
System.err.println("Could not connect to server.");
e.printStackTrace();
JOptionPane.showMessageDialog(null, e);
}
try {
if (!ftp.login(username, password)) {
ftp.logout();
}
System.out.println("Remote system is " +
ftp.getSystemName());
System.out.println("My directory is " +
ftp.printWorkingDirectory());
// Use passive mode as default because most of us
are
// behind firewalls these days.
// ftp.enterLocalPassiveMode();
} catch (FTPConnectionClosedException e) {
System.err.println("Server closed connection.");
e.printStackTrace();
throw e;
} catch (IOException e) {
e.printStackTrace();
throw e;
}
} // end main
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws
IOException {
String s =
RemoteFilesListDialog.showDialog(null,null,"label","title","myserver.com",
"login", "password", "Save");
System.out.println("selected file:" + s);
}
}
class PrintingCommandListener implements
ProtocolCommandListener {
private PrintWriter __writer;
public PrintingCommandListener(PrintWriter writer) {
__writer = writer;
}
public void protocolCommandSent(ProtocolCommandEvent
event) {
__writer.print(event.getMessage());
__writer.flush();
}
public void
protocolReplyReceived(ProtocolCommandEvent event) {
__writer.print(event.getMessage());
__writer.flush();
}
}
===========================
--- Julius Davies <[EMAIL PROTECTED]> wrote:
> Anil Philip,
>
> Personally, I find FTPClient a lot snappier and more
> reliable if I go into passive mode:
>
> FTPClient ftpClient = new FTPClient();
> ftpClient.setDefaultTimeout( 60 * 1000 );
> ftpClient.setSoTimeout( 60 * 1000 );
> ftpClient.setDataTimeout( 60 * 1000 );
>
> ftpClient.connect( "juliusdavies.ca" );
> ftpClient.login( "julius", "password" );
>
> // Enter PASSIVE mode!
> ftpClient.enterLocalPassiveMode();
>
>
>
> yours,
>
> Julius Davies
>
> http://juliusdavies.ca/
>
>
> -----Original Message-----
> From: Daniel F. Savarese [mailto:[EMAIL PROTECTED]
> Sent: Thu 8/10/2006 7:48 PM
> To: [email protected]
> Cc:
> Subject: Re: [commons-net ftp] why is commons ftp so
> slow compared with http?
>
>
> In message
>
<[EMAIL PROTECTED]>,
> Anil Philip wr
> ites:
> >My program is logging into my server and doing an
> ls
> >in an almost empty directory. It takes about 10
> >seconds.
> >Contrast this with: I create an .htaccess file in
> the
> >same dir so that the dir can be accessed in
> Internet
> >Explorer and lists the folder contents. (Options
> >+Indexes). It takes about 2.5 seconds.
> >why is commons-net so painfully slow compared with
> >http for a similar operation? (Is it just the
> >authentication?)
>
> Presumably you're talking about FTP. FTPClient is
> far from perfect
> and its implementation is very dated and
> inefficient. However, one
> should always keep in mind that the basic code has
> been used by
> innumerable programmers for almost 10 years now, so
> when you run
> into an issue like this, it's probably not
> commons-net, but rather
> how you're using it.
>
> First, establishing a new FTP connection every time
> you list a
> directory will always be slower than HTTP. First
> you have to log in,
> then you have to establish a data connection for the
> file listing.
> The fact that it takes 10 seconds for you has to do
> with your
> particular code and runtime environment. Using a
> modified version
> of the ftp.java example (so that it will print a
> listing in addition
> to performing the file transfer), I can list
>
ftp://distro.ibiblio.org/pub/linux/distributions/fedora/linux/core/5/i386/os/
> and
> download
>
ftp://distro.ibiblio.org/pub/linux/distributions/fedora/linux/core/5/i386/os/RPM
> -GP-KEY
> in less than a second. And that includes the JVM
> start up time (I
> just use /usr/bin/time to time it).
>
> Without a precisely specified test case that other
> people can run to
> try to reproduce the behavior you are encountering,
> there's no telling
> what you are experiencing.
>
> daniel
>
>
>
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