Module com.aoapps.lang

Package com.aoapps.lang.io

Class FileUtils

java.lang.Object

com.aoapps.lang.io.FileUtils

public final class FileUtils
extends Object

File utilities.

Method Summary

Modifier and Type	Method	Description
static File	checkIsDirectory(File directory)	Ensures that the file is a directory.
static boolean	contentEquals(File file, byte[] contents)	Compares the contents of a file to the provided array.
static boolean	contentEquals(File file1, File file2)	Compares the contents of two files, not supporting directories.
static int	contentHashCode(File file)	Computes a hash code of the file contents, consistent with Arrays.hashCode(byte[]).
static long	copy(File from, File to)	Copies one file over another, possibly creating if needed.
static long	copy(File from, OutputStream out)	Copies a file to an output stream.
static long	copy(File from, Writer out)	Copies a file to a writer in system default locale.
static long	copy(File from, Appendable out)	Copies a file to an appendable in system default locale.
static void	copyRecursive(File from, File to)	Recursively copies source to destination.
static void	copyRecursive(File from, File to, FileFilter fileFilter)	Recursively copies source to destination.
static long	copyToFile(InputStream in, File file)	Copies a stream to a file.
static File	copyToTempFile(InputStream in, String prefix, String suffix)	Copies a stream to a newly created temporary file in the given directory.
static File	copyToTempFile(InputStream in, String prefix, String suffix, File directory)	Copies a stream to a newly created temporary file.
static File	createTempDirectory(String prefix, String suffix)	Deprecated. Please use Files.createTempDirectory(java.lang.String, java.nio.file.attribute.FileAttribute...), which does not suffer from any race conditions.
static File	createTempDirectory(String prefix, String suffix, File directory)	Deprecated. Please use Files.createTempDirectory(java.nio.file.Path, java.lang.String, java.nio.file.attribute.FileAttribute...), which does not suffer from any race conditions.
static void	delete(File file)	Deprecated. Please use Files.delete(java.nio.file.Path)
static void	deleteRecursive(File file)	Deprecated. Please use FileUtils.deleteDirectory(java.io.File) or FileUtils.forceDelete(java.io.File)from Apache Commons IO.
static String	getExtension(String path)	Gets the extension from the path, not including any period.
static File	getFile(URL url, String urlEncoding, boolean deleteOnExit)	Deprecated. Please use TempFileContext as File.deleteOnExit() is prone to memory leaks in long-running applications.
static File	mkdir(File directory)	Deprecated. Please use Files.createDirectory(java.nio.file.Path, java.nio.file.attribute.FileAttribute...).
static File	mkdirs(File directory)	Deprecated. Please use Files.createDirectories(java.nio.file.Path, java.nio.file.attribute.FileAttribute...)
static String	readFileAsString(File file)	Reads the contents of a File and returns as a String in the system default character set.
static String	readFileAsString(File file, Charset charset)	Reads the contents of a File and returns as a String in the provided character set.
static void	rename(File from, File to)	Atomically renames one file to another, throwing IOException when unsuccessful.
static void	renameAllowNonAtomic(File from, File to)	Renames one file to another, throwing IOException when unsuccessful.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

delete

@Deprecated
public static void delete(File file)
                   throws IOException

Deprecated.

Please use Files.delete(java.nio.file.Path)

Deletes the provided file, throwing IOException if unsuccessful.

Throws:

IOException

deleteRecursive

@Deprecated
public static void deleteRecursive(File file)
                            throws IOException

Deprecated.

Please use FileUtils.deleteDirectory(java.io.File) or FileUtils.forceDelete(java.io.File)from Apache Commons IO.

Recursively deletes the provided file, being careful to not follow symbolic links (but there are still unavoidable race conditions).

Throws:

IOException

contentEquals

public static boolean contentEquals(File file,
 byte[] contents)
                             throws IOException

Compares the contents of a file to the provided array.

Throws:

IOException

contentEquals

public static boolean contentEquals(File file1,
 File file2)
                             throws IOException

Compares the contents of two files, not supporting directories.

Throws:

IOException

contentHashCode

public static int contentHashCode(File file)
                           throws IOException

Computes a hash code of the file contents, consistent with Arrays.hashCode(byte[]).

Throws:

IOException

See Also:

• Arrays.hashCode(byte[])

createTempDirectory

@Deprecated
public static File createTempDirectory(String prefix,
 String suffix)
                                throws IOException

Deprecated.

Please use Files.createTempDirectory(java.lang.String, java.nio.file.attribute.FileAttribute...), which does not suffer from any race conditions.

Creates a temporary directory.

Throws:

IOException

createTempDirectory

@Deprecated
public static File createTempDirectory(String prefix,
 String suffix,
 File directory)
                                throws IOException

Deprecated.

Please use Files.createTempDirectory(java.nio.file.Path, java.lang.String, java.nio.file.attribute.FileAttribute...), which does not suffer from any race conditions.

Creates a temporary directory.

Throws:

IOException

copyToFile

public static long copyToFile(InputStream in,
 File file)
                       throws IOException

Copies a stream to a file.

Returns:

the number of bytes copied

Throws:

IOException

copyToTempFile

public static File copyToTempFile(InputStream in,
 String prefix,
 String suffix)
                           throws IOException

Copies a stream to a newly created temporary file in the given directory.

The file is created with the default permissions via Files.createTempFile(java.lang.String, java.lang.String, java.nio.file.attribute.FileAttribute...).

The file is not deleted on exit. If this is required, we recommend creating the temp file with the AO TempFiles project, then using copyToFile(java.io.InputStream, java.io.File). This avoids the memory leak of the implementation of File.deleteOnExit().

Throws:

IOException

copyToTempFile

public static File copyToTempFile(InputStream in,
 String prefix,
 String suffix,
 File directory)
                           throws IOException

Copies a stream to a newly created temporary file.

The file is created with the default permissions via Files.createTempFile(java.lang.String, java.lang.String, java.nio.file.attribute.FileAttribute...).

The file is not deleted on exit. If this is required, we recommend creating the temp file with the AO TempFiles project, then using copyToFile(java.io.InputStream, java.io.File). This avoids the memory leak of the implementation of File.deleteOnExit().

Throws:

IOException

mkdir

@Deprecated
public static File mkdir(File directory)
                  throws IOException

Deprecated.

Please use Files.createDirectory(java.nio.file.Path, java.nio.file.attribute.FileAttribute...).

Makes a directory. The directory must not already exist.

Returns:

The directory itself.

Throws:

IOException - if mkdir fails.

mkdirs

@Deprecated
public static File mkdirs(File directory)
                   throws IOException

Deprecated.

Please use Files.createDirectories(java.nio.file.Path, java.nio.file.attribute.FileAttribute...)

Makes a directory and all of its parents. The directory may optionally already exist.

Returns:

The directory itself.

Throws:

IOException - if mkdirs fails.

checkIsDirectory

public static File checkIsDirectory(File directory)
                             throws IOException

Ensures that the file is a directory.

Returns:

The directory itself.

Throws:

IOException - if not a directory

copy

public static long copy(File from,
 File to)
                 throws IOException

Copies one file over another, possibly creating if needed.

Returns:

the number of bytes copied

Throws:

IOException

copy

public static long copy(File from,
 OutputStream out)
                 throws IOException

Copies a file to an output stream.

Returns:

the number of bytes copied

Throws:

IOException

copy

public static long copy(File from,
 Writer out)
                 throws IOException

Copies a file to a writer in system default locale.

Returns:

the number of characters copied

Throws:

IOException

copy

public static long copy(File from,
 Appendable out)
                 throws IOException

Copies a file to an appendable in system default locale.

Returns:

the number of characters copied

Throws:

IOException

copyRecursive

public static void copyRecursive(File from,
 File to)
                          throws IOException

Recursively copies source to destination. Destination must not exist.

Throws:

IOException

copyRecursive

public static void copyRecursive(File from,
 File to,
 FileFilter fileFilter)
                          throws IOException

Recursively copies source to destination. Destination must not exist.

Throws:

IOException

getExtension

public static String getExtension(String path)

Gets the extension from the path, not including any period. If no extension, returns an empty string.

getFile

@Deprecated
public static File getFile(URL url,
 String urlEncoding,
 boolean deleteOnExit)
                    throws IOException

Deprecated.

Please use TempFileContext as File.deleteOnExit() is prone to memory leaks in long-running applications.

Gets a File for a URL, retrieving the contents into a temporary file if needed.

The file is created with the default permissions via Files.createTempFile(java.lang.String, java.lang.String, java.nio.file.attribute.FileAttribute...).

Parameters:

deleteOnExit - when true, any newly created temp file will be flagged for delete on exit

Throws:

IOException

rename

public static void rename(File from,
 File to)
                   throws IOException

Atomically renames one file to another, throwing IOException when unsuccessful.

Throws:

IOException

renameAllowNonAtomic

public static void renameAllowNonAtomic(File from,
 File to)
                                 throws IOException

Renames one file to another, throwing IOException when unsuccessful. Allow a non-atomic delete/rename pair when the underlying system is unable to rename one file over another, such as in Microsoft Windows.

Throws:

IOException

readFileAsString

public static String readFileAsString(File file)
                               throws IOException

Reads the contents of a File and returns as a String in the system default character set.

Throws:

IOException

See Also:

• readFileAsString(java.io.File, java.nio.charset.Charset)
• Charset.defaultCharset()

readFileAsString

public static String readFileAsString(File file,
 Charset charset)
                               throws IOException

Reads the contents of a File and returns as a String in the provided character set.

Throws:

IOException

See Also:

• readFileAsString(java.io.File)