File System in java

[Yogini Shirodkar]

Hi All,
From java is it possible to locate the root directories and files residing them, from the machines in the local network ?
I want something like network neighbourhood type application , so that i can view and select file from network machine
Thanks in advance!!

[John Lee]

refer to Java File System.

[Michael Morris]

From java is it possible to locate the root directories and files residing them, from the machines in the local network ?
The static method File.listRoots() returns a File[] array listing all the system root directories. On Unix OSs, including Linux, that will return the single root directory ("/"); on Windows platforms it will return the roots of all mounted drives on the system. You can then recursively create a tree structure of the file systems by testing whether or not each file is a directory with File.isDirectory() and if it is you can call File.listFiles() which also returns a File[] array.
[ May 28, 2003: Message edited by: Michael Morris ]

[Joel McNary]

Note that, on Windows, this just lists the roots of those directories that have lettered drives (have been mounted). This does not return machine names on the network neighborhood (or from the Chooser if you're on a Mac ). I'm not sure how one would go about getting that information....

[Michael Morris]

I'm not sure how one would go about getting that information....
When Sun gets off their ass and gives us raw sockets so we can query the network.

[Michael Morris]

Here's some code I wrote a while back showing how to create a JTree of the local file system. This code is very inefficient, it takes over two minutes on my machine to create the top level node in the tree. So be patient and be warned.
ExplorerTree.java

import java.util.*;
import java.io.*;
import java.net.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
public class ExplorerTree extends JTree {
    public ExplorerTree() {
        super(ExplorerNode.makeTopNode());
    }
}
class ExplorerNode {
    public static DefaultMutableTreeNode makeTopNode() {
        String host = "localhost";
        try {
            host = InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException ignore) {}
        DefaultMutableTreeNode top = new DefaultMutableTreeNode(host);
        File[] roots = File.listRoots();
        Arrays.sort(roots);
        for (int i = 0; i < roots.length; i++) {
            DefaultMutableTreeNode drive = new DefaultMutableTreeNode(
                    roots[i].getPath());
            File[] files = roots[i].listFiles();
            if (files != null) {
                Arrays.sort(files);
                top.add(drive);
                for (int j = 0; j < files.length; j++) {
                    drive.add(getNextNode(files[j]));
                }
            }
        }
        return top;
    }
    private static DefaultMutableTreeNode getNextNode(File file) {
        DefaultMutableTreeNode node = new DefaultMutableTreeNode(
                file.getName());
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            if (files != null) {
                Arrays.sort(files);
                for (int i = 0; i < files.length; i++) {
                    node.add(getNextNode(files[i]));
                }
            }
        }
        return node;
    }
}

TreeExplorer.java

import java.util.*;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
public class TreeExplorer extends JFrame {
    public TreeExplorer() {
        setTitle("Simple Tree Explorer");
        getContentPane().add(new JScrollPane(new ExplorerTree()));
        addWindowListener(new WindowAdapter() {
                                  public void windowClosing(WindowEvent e) {
                                      System.exit(0);
                                  }
                              }
                          );
    }
    public static void main(String[] args) {
        Frame f = new TreeExplorer();
        f.pack();
        f.show();
    }
}