Java Delete Directory deleteDirectory(File directory)

Description

Deletes a directory recursively.

License

Open Source License

Parameter

Parameter	Description
directory	directory to delete

Exception

Parameter	Description
IOException	in case deletion is unsuccessful

Declaration

public static void deleteDirectory(File directory) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

public class Main {
    /**/* w w w .j a  v  a2s.  c  o m*/
     * Deletes a directory recursively.
     * @param directory directory to delete
     * @throws IOException in case deletion is unsuccessful
     */
    public static void deleteDirectory(File directory) throws IOException {
        if (!directory.exists()) {
            return;
        }

        if (!isSymlink(directory)) {
            cleanDirectory(directory);
        }

        if (!directory.delete()) {
            String message = "Unable to delete directory " + directory + ".";
            throw new IOException(message);
        }
    }

    /**
     * Determines whether the specified file is a Symbolic Link rather than an
     * actual file.
     * <p>
     * Will not return true if there is a Symbolic Link anywhere in the path, only
     * if the specific file is.
     * @param file the file to check
     * @return true if the file is a Symbolic Link
     * @throws IOException if an IO error occurs while checking the file
     * @since Commons IO 2.0
     */
    public static boolean isSymlink(File file) throws IOException {
        if (file == null) {
            throw new NullPointerException("File must not be null");
        }

        /*
         * if (FilenameUtils.isSystemWindows()) { return false; }
         */

        File fileInCanonicalDir = null;
        if (file.getParent() == null) {
            fileInCanonicalDir = file;
        } else {
            File canonicalDir = file.getParentFile().getCanonicalFile();
            fileInCanonicalDir = new File(canonicalDir, file.getName());
        }

        if (fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile())) {
            return false;
        } else {
            return true;
        }
    }

    /**
     * Cleans a directory without deleting net.
     * @param directory directory to clean
     * @throws IOException in case cleaning is unsuccessful
     */
    public static void cleanDirectory(File directory) throws IOException {
        if (!directory.exists()) {
            String message = directory + " does not exist";
            throw new IllegalArgumentException(message);
        }

        if (!directory.isDirectory()) {
            String message = directory + " is not a directory";
            throw new IllegalArgumentException(message);
        }

        File[] files = directory.listFiles();
        if (files == null) { // null if security restricted
            throw new IOException("Failed to list contents of " + directory);
        }

        IOException exception = null;
        for (File file : files) {
            try {
                forceDelete(file);
            } catch (IOException ioe) {
                exception = ioe;
            }
        }

        if (null != exception) {
            throw exception;
        }
    }

    /**
     * Deletes a file. If file is a directory, delete net and all sub-directories.
     * <p>
     * The difference between File.delete() and this method are:
     * <ul>
     * <li>A directory to be deleted does not have to be empty.</li>
     * <li>You get exceptions when a file or directory cannot be deleted.
     * (java.io.File methods returns a boolean)</li>
     * </ul>
     * @param file file or directory to delete, must not be <code>null</code>
     * @throws NullPointerException if the directory is <code>null</code>
     * @throws FileNotFoundException if the file was not found
     * @throws IOException in case deletion is unsuccessful
     */
    public static void forceDelete(File file) throws IOException {
        if (file.isDirectory()) {
            deleteDirectory(file);
        } else {
            boolean filePresent = file.exists();
            if (!file.delete()) {
                if (!filePresent) {
                    throw new FileNotFoundException("File does not exist: " + file);
                }
                String message = "Unable to delete file: " + file;
                throw new IOException(message);
            }
        }
    }
}

Related

1. deleteDirectory(File dir, boolean isInitialDelete)
2. deleteDirectory(File dir, boolean isInitialDelete)
3. deleteDirectory(File dir, boolean recursive)
4. deleteDirectory(File dir, Map preserve)
5. deleteDirectory(File directory)
6. deleteDirectory(File directory)
7. deleteDirectory(File directory)
8. deleteDirectory(File directory)
9. deleteDirectory(File directory)