Java

Iterate over Files and Directories in Filesystem Directory Tree

Demonstrates how to use the Chilkat DirTree object/class to iterate over the names of files and sub-directories in a directory tree.

This example iterates over a directory tree that contains these files and sub-directories:

a
    images (sub-directory)
        dudeA.gif
        Thumbs.db
    hamlet.xml
    pigs.xml
    Setup.exe
b
    yyy (sub-directory)
    zzz (sub-directory)
        HelloWorld123.txt
        test123.txt
    dude.gif
    dudeC.gif
    hello.txt
    Thumbs.db
test123.txt

The output for the code below looks like this:

(sub-directory)
Relative Path: a
Absolute Path: c:\temp\abc123\a
Absolute UNC Path: \\?\c:\temp\abc123\a
----
(sub-directory)
Relative Path: b
Absolute Path: c:\temp\abc123\b
Absolute UNC Path: \\?\c:\temp\abc123\b
----
Size in bytes: 15
Relative Path: test123.txt
Absolute Path: c:\temp\abc123\test123.txt
Absolute UNC Path: \\?\c:\temp\abc123\test123.txt
----
Size in bytes: 279658
Relative Path: a\hamlet.xml
Absolute Path: c:\temp\abc123\a\hamlet.xml
Absolute UNC Path: \\?\c:\temp\abc123\a\hamlet.xml
----
(sub-directory)
Relative Path: a\images
Absolute Path: c:\temp\abc123\a\images
Absolute UNC Path: \\?\c:\temp\abc123\a\images
----
Size in bytes: 8463
Relative Path: a\pigs.xml
Absolute Path: c:\temp\abc123\a\pigs.xml
Absolute UNC Path: \\?\c:\temp\abc123\a\pigs.xml
----
Size in bytes: 24576
Relative Path: a\Setup.exe
Absolute Path: c:\temp\abc123\a\Setup.exe
Absolute UNC Path: \\?\c:\temp\abc123\a\Setup.exe
----
Size in bytes: 6221
Relative Path: b\dude.gif
Absolute Path: c:\temp\abc123\b\dude.gif
Absolute UNC Path: \\?\c:\temp\abc123\b\dude.gif
----
Size in bytes: 6221
Relative Path: b\dudeC.gif
Absolute Path: c:\temp\abc123\b\dudeC.gif
Absolute UNC Path: \\?\c:\temp\abc123\b\dudeC.gif
----
Size in bytes: 13
Relative Path: b\hello.txt
Absolute Path: c:\temp\abc123\b\hello.txt
Absolute UNC Path: \\?\c:\temp\abc123\b\hello.txt
----
Size in bytes: 10240
Relative Path: b\Thumbs.db
Absolute Path: c:\temp\abc123\b\Thumbs.db
Absolute UNC Path: \\?\c:\temp\abc123\b\Thumbs.db
----
(sub-directory)
Relative Path: b\yyy
Absolute Path: c:\temp\abc123\b\yyy
Absolute UNC Path: \\?\c:\temp\abc123\b\yyy
----
(sub-directory)
Relative Path: b\zzz
Absolute Path: c:\temp\abc123\b\zzz
Absolute UNC Path: \\?\c:\temp\abc123\b\zzz
----
Size in bytes: 6221
Relative Path: a\images\dudeA.gif
Absolute Path: c:\temp\abc123\a\images\dudeA.gif
Absolute UNC Path: \\?\c:\temp\abc123\a\images\dudeA.gif
----
Size in bytes: 6144
Relative Path: a\images\Thumbs.db
Absolute Path: c:\temp\abc123\a\images\Thumbs.db
Absolute UNC Path: \\?\c:\temp\abc123\a\images\Thumbs.db
----
Size in bytes: 6080
Relative Path: b\zzz\HelloWorld123.txt
Absolute Path: c:\temp\abc123\b\zzz\HelloWorld123.txt
Absolute UNC Path: \\?\c:\temp\abc123\b\zzz\HelloWorld123.txt
----
Size in bytes: 15
Relative Path: b\zzz\test123.txt
Absolute Path: c:\temp\abc123\b\zzz\test123.txt
Absolute UNC Path: \\?\c:\temp\abc123\b\zzz\test123.txt
----

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.DirTree;

public class ChilkatExample {

    public static void main(String[] args) {
        DirTree dirTree = new DirTree();

        // Specify the root of the directory tree to be traversed.
        dirTree.setBaseDir("c:/temp/abc123");

        // Indicate that we want to recursively traverse the tree.
        dirTree.setRecurse(true);

        // Begin the directory tree traversal.
        try {
            dirTree.beginIterate();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        boolean doneIterating = dirTree.getDoneIterating();
        while (!doneIterating) {
            // Examine the file or directory at the current traversal position:
            if (dirTree.getIsDirectory()) {
                System.out.println("(sub-directory)");
            } else {
                System.out.println("Size in bytes: " + dirTree.getFileSize32());
                // If the file size is larger than 2GB, then get the size as a decimal string.
                // (Chilkat provides a FileSize64 method in *some* programming languages. The FileSizeStr property is added in Chilkat v9.5.0.88)
                System.out.println("Size in bytes: " + dirTree.getFileSizeStr());
            }

            System.out.println("Relative Path: " + dirTree.getRelativePath());
            System.out.println("Absolute Path: " + dirTree.getFullPath());
            System.out.println("Absolute UNC Path: " + dirTree.getFullUncPath());
            System.out.println("----");

            // Advance to the next file or sub-directory in the tree traversal.
            try {
                dirTree.advancePosition();
            } catch (ChilkatException e) {
                if (!dirTree.getDoneIterating()) {
                    System.out.println(e.getLastErrorText());
                    return;
                }
            }

            doneIterating = dirTree.getDoneIterating();
        }
    }
}