org.jfox.util
Class FileUtils

java.lang.Object
  org.jfox.util.FileUtils

public class FileUtils
extends java.lang.Object

Constructor Summary

FileUtils()

Method Summary

static boolean	cleanDirectory(java.io.File directory) Clean a directory without deleting it.
static java.lang.String	content(java.io.File file) get file content
static java.io.File	copy(java.io.File source, java.io.File dir) Copy a file.
static boolean	delete(java.io.File file) Delete a file.
static boolean	deleteDirectory(java.io.File dir) Delete a file, or a directory and all of its contents.
static void	deleteOnExit(java.io.File file) Schedule a file to be deleted when JVM exits.
static void	extractJar(java.io.File jarFile, java.io.File dest) Dump the contents of a JarArchive to the dpecified destination.
static java.util.Map<java.lang.String,byte[]>	getClassBytesMap(java.io.File file) 从文件或目录中搜索所有的 class 文件
static java.util.Map<java.lang.String,byte[]>	getClassBytesMap(java.net.URL location) 获得一个 URL 中所有的Class Name
static java.net.URL	getDescriptor(java.net.URLClassLoader loader, java.lang.String descriptorName) use URLClassLoader.findResource, this method will not find resource use parent
static java.util.jar.Manifest	getManifest(java.io.File jarFile)
static java.util.List<java.io.File>	listFiles(java.io.File dir, java.io.FileFilter filter) list Files recursively
static void	main(java.lang.String[] args)
static java.io.File	move(java.io.File source, java.io.File dir) move the source file to the targe directory
static java.io.File	toFile(java.net.URL url) Convert from a URL to a File.
static void	touch(java.io.File file) Implements the same behaviour as the "touch" utility on Unix.
static java.net.URL[]	toURLs(java.io.File[] files) Convert the array of Files into a list of URLs.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileUtils

public FileUtils()

Method Detail

delete

public static boolean delete(java.io.File file)

Delete a file. If file is a directory, delete it and all sub-directories.

The difference between File.delete() and this method are:

• A directory to be deleted does not have to be empty.
• You get exceptions when a file or directory cannot be deleted. (java.io.File methods returns a boolean)

Parameters:

file - file or directory to delete.

deleteDirectory

public static boolean deleteDirectory(java.io.File dir)

Delete a file, or a directory and all of its contents.

Parameters:

dir - The directory or file to delete.

Returns:

True if all delete operations were successfull.

cleanDirectory

public static boolean cleanDirectory(java.io.File directory)

Clean a directory without deleting it.

Parameters:

directory - directory to clean

deleteOnExit

public static void deleteOnExit(java.io.File file)
                         throws java.io.IOException

Schedule a file to be deleted when JVM exits. If file is directory delete it and all sub-directories.

Parameters:

file - file or directory to delete.

Throws:

java.io.IOException - in case deletion is unsuccessful

copy

public static java.io.File copy(java.io.File source,
                                java.io.File dir)
                         throws java.io.IOException

Copy a file.

Parameters:

source - Source file to copy.

dir - Destination target dir.

Throws:

java.io.IOException - Failed to copy file.

move

public static java.io.File move(java.io.File source,
                                java.io.File dir)
                         throws java.io.IOException

move the source file to the targe directory

Parameters:

source -

dir -

Throws:

java.io.IOException

touch

public static void touch(java.io.File file)
                  throws java.io.IOException

Implements the same behaviour as the "touch" utility on Unix. It creates a new file with size 0 or, if the file exists already, it is opened and closed without modifying it, but updating the file date and time.

Parameters:

file - the File to touch

Throws:

java.io.IOException - If an I/O problem occurs

toURLs

public static java.net.URL[] toURLs(java.io.File[] files)
                             throws java.io.IOException

Convert the array of Files into a list of URLs.

Parameters:

files - the array of files

Returns:

the array of URLs

Throws:

java.io.IOException - if an error occurs

toFile

public static java.io.File toFile(java.net.URL url)

Convert from a URL to a File.

Parameters:

url - File URL.

Returns:

The equivalent File object, or null if the URL's protocol is not file

content

public static java.lang.String content(java.io.File file)
                                throws java.io.IOException

get file content

Throws:

java.io.IOException

listFiles

public static java.util.List<java.io.File> listFiles(java.io.File dir,
                                                     java.io.FileFilter filter)

list Files recursively

Parameters:

dir - directory

filter - file filter

Returns:

File list

extractJar

public static void extractJar(java.io.File jarFile,
                              java.io.File dest)
                       throws java.io.IOException

Dump the contents of a JarArchive to the dpecified destination.

Throws:

java.io.IOException

getDescriptor

public static java.net.URL getDescriptor(java.net.URLClassLoader loader,
                                         java.lang.String descriptorName)

use URLClassLoader.findResource, this method will not find resource use parent

Parameters:

loader -

descriptorName -

Returns:

null if no such descriptor

getManifest

public static java.util.jar.Manifest getManifest(java.io.File jarFile)
                                          throws java.io.IOException

Throws:

java.io.IOException

getClassBytesMap

public static java.util.Map<java.lang.String,byte[]> getClassBytesMap(java.net.URL location)
                                                               throws java.io.IOException

获得一个 URL 中所有的Class Name

Parameters:

location - url location

Throws:

java.io.IOException - ioexception

getClassBytesMap

public static java.util.Map<java.lang.String,byte[]> getClassBytesMap(java.io.File file)
                                                               throws java.io.IOException

从文件或目录中搜索所有的 class 文件

Parameters:

file - file

Returns:

classname=>class bytes

Throws:

java.io.IOException - ioexception

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception