fileutils.java

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        if (destFile == null) {
            throw new NullPointerException("Destination must not be null");
        }
        if (srcFile.exists() == false) {
            throw new FileNotFoundException("Source '" + srcFile + "' does not exist");
        }
        if (srcFile.isDirectory()) {
            throw new IOException("Source '" + srcFile + "' exists but is a directory");
        }
        if (srcFile.getCanonicalPath().equals(destFile.getCanonicalPath())) {
            throw new IOException("Source '" + srcFile + "' and destination '" + destFile + "' are the same");
        }
        if (destFile.getParentFile() != null && destFile.getParentFile().exists() == false) {
            if (destFile.getParentFile().mkdirs() == false) {
                throw new IOException("Destination '" + destFile + "' directory cannot be created");
            }
        }
        if (destFile.exists() && destFile.canWrite() == false) {
            throw new IOException("Destination '" + destFile + "' exists but is read-only");
        }
        doCopyFile(srcFile, destFile, preserveFileDate);
    }

    /**
     * Internal copy file method.
     * 
     * @param srcFile  the validated source file, must not be <code>null</code>
     * @param destFile  the validated destination file, must not be <code>null</code>
     * @param preserveFileDate  whether to preserve the file date
     * @throws IOException if an error occurs
     */
    private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
        if (destFile.exists() && destFile.isDirectory()) {
            throw new IOException("Destination '" + destFile + "' exists but is a directory");
        }

        FileInputStream input = new FileInputStream(srcFile);
        try {
            FileOutputStream output = new FileOutputStream(destFile);
            try {
                IOUtils.copy(input, output);
            } finally {
                IOUtils.closeQuietly(output);
            }
        } finally {
            IOUtils.closeQuietly(input);
        }

        if (srcFile.length() != destFile.length()) {
            throw new IOException("Failed to copy full contents from '" +
                    srcFile + "' to '" + destFile + "'");
        }
        if (preserveFileDate) {
            destFile.setLastModified(srcFile.lastModified());
        }
    }

    //-----------------------------------------------------------------------
    /**
     * Copies a directory to within another directory preserving the file dates.
     * <p>
     * This method copies the source directory and all its contents to a
     * directory of the same name in the specified destination directory.
     * <p>
     * The destination directory is created if it does not exist.
     * If the destination directory did exist, then this method merges
     * the source with the destination, with the source taking precedence.
     *
     * @param srcDir  an existing directory to copy, must not be <code>null</code>
     * @param destDir  the directory to place the copy in, must not be <code>null</code>
     *
     * @throws NullPointerException if source or destination is <code>null</code>
     * @throws IOException if source or destination is invalid
     * @throws IOException if an IO error occurs during copying
     * @since Commons IO 1.2
     */
    public static void copyDirectoryToDirectory(File srcDir, File destDir) throws IOException {
        if (srcDir == null) {
            throw new NullPointerException("Source must not be null");
        }
        if (srcDir.exists() && srcDir.isDirectory() == false) {
            throw new IllegalArgumentException("Source '" + destDir + "' is not a directory");
        }
        if (destDir == null) {
            throw new NullPointerException("Destination must not be null");
        }
        if (destDir.exists() && destDir.isDirectory() == false) {
            throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory");
        }
        copyDirectory(srcDir, new File(destDir, srcDir.getName()), true);
    }

    /**
     * Copies a whole directory to a new location preserving the file dates.
     * <p>
     * This method copies the specified directory and all its child
     * directories and files to the specified destination.
     * The destination is the new location and name of the directory.
     * <p>
     * The destination directory is created if it does not exist.
     * If the destination directory did exist, then this method merges
     * the source with the destination, with the source taking precedence.
     *
     * @param srcDir  an existing directory to copy, must not be <code>null</code>
     * @param destDir  the new directory, must not be <code>null</code>
     *
     * @throws NullPointerException if source or destination is <code>null</code>
     * @throws IOException if source or destination is invalid
     * @throws IOException if an IO error occurs during copying
     * @since Commons IO 1.1
     */
    public static void copyDirectory(File srcDir, File destDir) throws IOException {
        copyDirectory(srcDir, destDir, true);
    }

    /**
     * Copies a whole directory to a new location.
     * <p>
     * This method copies the contents of the specified source directory
     * to within the specified destination directory.
     * <p>
     * The destination directory is created if it does not exist.
     * If the destination directory did exist, then this method merges
     * the source with the destination, with the source taking precedence.
     *
     * @param srcDir  an existing directory to copy, must not be <code>null</code>
     * @param destDir  the new directory, must not be <code>null</code>
     * @param preserveFileDate  true if the file date of the copy
     *  should be the same as the original
     *
     * @throws NullPointerException if source or destination is <code>null</code>
     * @throws IOException if source or destination is invalid
     * @throws IOException if an IO error occurs during copying
     * @since Commons IO 1.1
     */
    public static void copyDirectory(File srcDir, File destDir,
            boolean preserveFileDate) throws IOException {
        copyDirectory(srcDir, destDir, null, preserveFileDate);
    }

    /**
     * Copies a filtered directory to a new location preserving the file dates.
     * <p>
     * This method copies the contents of the specified source directory
     * to within the specified destination directory.
     * <p>
     * The destination directory is created if it does not exist.
     * If the destination directory did exist, then this method merges
     * the source with the destination, with the source taking precedence.
     *
     * <h4>Example: Copy directories only</h4> 
     *  <pre>
     *  // only copy the directory structure
     *  FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY);
     *  </pre>
     *
     * <h4>Example: Copy directories and txt files</h4>
     *  <pre>
     *  // Create a filter for ".txt" files
     *  IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
     *  IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
     *
     *  // Create a filter for either directories or ".txt" files
     *  FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
     *
     *  // Copy using the filter
     *  FileUtils.copyDirectory(srcDir, destDir, filter);
     *  </pre>
     *
     * @param srcDir  an existing directory to copy, must not be <code>null</code>
     * @param destDir  the new directory, must not be <code>null</code>
     * @param filter  the filter to apply, null means copy all directories and files
     *  should be the same as the original
     *
     * @throws NullPointerException if source or destination is <code>null</code>
     * @throws IOException if source or destination is invalid
     * @throws IOException if an IO error occurs during copying
     * @since Commons IO 1.4
     */
    public static void copyDirectory(File srcDir, File destDir,
            FileFilter filter) throws IOException {
        copyDirectory(srcDir, destDir, filter, true);
    }

    /**
     * Copies a filtered directory to a new location.
     * <p>
     * This method copies the contents of the specified source directory
     * to within the specified destination directory.
     * <p>
     * The destination directory is created if it does not exist.
     * If the destination directory did exist, then this method merges
     * the source with the destination, with the source taking precedence.
     *
     * <h4>Example: Copy directories only</h4> 
     *  <pre>
     *  // only copy the directory structure
     *  FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY, false);
     *  </pre>
     *
     * <h4>Example: Copy directories and txt files</h4>
     *  <pre>
     *  // Create a filter for ".txt" files
     *  IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
     *  IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
     *
     *  // Create a filter for either directories or ".txt" files
     *  FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
     *
     *  // Copy using the filter
     *  FileUtils.copyDirectory(srcDir, destDir, filter, false);
     *  </pre>
     * 
     * @param srcDir  an existing directory to copy, must not be <code>null</code>
     * @param destDir  the new directory, must not be <code>null</code>
     * @param filter  the filter to apply, null means copy all directories and files
     * @param preserveFileDate  true if the file date of the copy
     *  should be the same as the original
     *
     * @throws NullPointerException if source or destination is <code>null</code>
     * @throws IOException if source or destination is invalid
     * @throws IOException if an IO error occurs during copying
     * @since Commons IO 1.4
     */
    public static void copyDirectory(File srcDir, File destDir,
            FileFilter filter, boolean preserveFileDate) throws IOException {
        if (srcDir == null) {
            throw new NullPointerException("Source must not be null");
        }
        if (destDir == null) {
            throw new NullPointerException("Destination must not be null");
        }
        if (srcDir.exists() == false) {
            throw new FileNotFoundException("Source '" + srcDir + "' does not exist");
        }
        if (srcDir.isDirectory() == false) {
            throw new IOException("Source '" + srcDir + "' exists but is not a directory");
        }
        if (srcDir.getCanonicalPath().equals(destDir.getCanonicalPath())) {
            throw new IOException("Source '" + srcDir + "' and destination '" + destDir + "' are the same");
        }

        // Cater for destination being directory within the source directory (see IO-141)
        List exclusionList = null;
        if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath())) {
            File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
            if (srcFiles != null && srcFiles.length > 0) {
                exclusionList = new ArrayList(srcFiles.length);
                for (int i = 0; i < srcFiles.length; i++) {
                    File copiedFile = new File(destDir, srcFiles[i].getName());
                    exclusionList.add(copiedFile.getCanonicalPath());
                }
            }
        }
        doCopyDirectory(srcDir, destDir, filter, preserveFileDate, exclusionList);
    }

    /**
     * Internal copy directory method.
     * 
     * @param srcDir  the validated source directory, must not be <code>null</code>
     * @param destDir  the validated destination directory, must not be <code>null</code>
     * @param filter  the filter to apply, null means copy all directories and files
     * @param preserveFileDate  whether to preserve the file date
     * @param exclusionList  List of files and directories to exclude from the copy, may be null
     * @throws IOException if an error occurs
     * @since Commons IO 1.1
     */
    private static void doCopyDirectory(File srcDir, File destDir, FileFilter filter,
            boolean preserveFileDate, List exclusionList) throws IOException {
        if (destDir.exists()) {
            if (destDir.isDirectory() == false) {
                throw new IOException("Destination '" + destDir + "' exists but is not a directory");
            }
        } else {
            if (destDir.mkdirs() == false) {
                throw new IOException("Destination '" + destDir + "' directory cannot be created");
            }
            if (preserveFileDate) {
                destDir.setLastModified(srcDir.lastModified());
            }
        }
        if (destDir.canWrite() == false) {
            throw new IOException("Destination '" + destDir + "' cannot be written to");
        }
        // recurse
        File[] files = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
        if (files == null) {  // null if security restricted
            throw new IOException("Failed to list contents of " + srcDir);
        }
        for (int i = 0; i < files.length; i++) {
            File copiedFile = new File(destDir, files[i].getName());
            if (exclusionList == null || !exclusionList.contains(files[i].getCanonicalPath())) {
                if (files[i].isDirectory()) {
                    doCopyDirectory(files[i], copiedFile, filter, preserveFileDate, exclusionList);
                } else {
                    doCopyFile(files[i], copiedFile, preserveFileDate);
                }
            }
        }
    }

    //-----------------------------------------------------------------------
    /**
     * Copies bytes from the URL <code>source</code> to a file
     * <code>destination</code>. The directories up to <code>destination</code>
     * will be created if they don't already exist. <code>destination</code>
     * will be overwritten if it already exists.
     *
     * @param source  the <code>URL</code> to copy bytes from, must not be <code>null</code>
     * @param destination  the non-directory <code>File</code> to write bytes to
     *  (possibly overwriting), must not be <code>null</code>
     * @throws IOException if <code>source</code> URL cannot be opened
     * @throws IOException if <code>destination</code> is a directory
     * @throws IOException if <code>destination</code> cannot be written
     * @throws IOException if <code>destination</code> needs creating but can't be