FileUtils (Common Utilities 4.0 API)

java.lang.Object
- com.sun.enterprise.util.io.FileUtils

```
public class FileUtils
extends Object
```

Constructor Summary

Constructors
Constructor and Description

FileUtils()

Constructors
Constructor and Description
`FileUtils()`

Method Summary

Methods
Modifier and Type	Method and Description
`static void`	`appendText(String fileName, String line)` Appends the given line at the end of given text file.
`static void`	`appendText(String fileName, StringBuffer buffer)`
`static void`	`copy(File fin, File fout)` Copies a file.
`static void`	`copy(InputStream in, FileOutputStream out, long size)`
`static void`	`copy(InputStream in, OutputStream os, long size)`
`static void`	`copy(String from, String to)` Copies a file.
`static void`	`copyFile(File fin, File fout)` This method is used to copy a given file to another file using the buffer sixe specified
`static void`	`copyTree(File din, File dout)` Copies the entire tree to a new location.
`static void`	`copyWithoutClose(InputStream in, FileOutputStream out, long size)`
`static File`	`createTempFile(File directory)`
`static boolean`	`deleteFile(File f)` Delete a file.
`static boolean`	`deleteFileMaybe(File f)` Wrapper for File.delete This version will return true if the file does not exist when the method returns.
`static void`	`deleteFileNowOrLater(File f)` Delete a file.
`static boolean`	`deleteFileWithWaitLoop(File f)` Delete a file.
`static File[]`	`findFilesInDir(File dir, String regexp)` Find files matching the regular expression in the given directory
`static String`	`formatFileCollection(Collection<File> files)` Creates a String listing the absolute paths of files, separated by the platform's line separator.
`static Set<File>`	`getAllFilesAndDirectoriesUnder(File directory)`
`static Set<File>`	`getAllFilesUnder(File directory, FilenameFilter filenameFilter)` Return a set of all the files (File objects) under the directory specified, with relative pathnames filtered with the filename filter (can be null for all files).
`static Set<File>`	`getAllFilesUnder(File directory, FilenameFilter filenameFilter, boolean relativize)`
`static File`	`getDirectory(File f)`
`static String`	`getIllegalFilenameCharacters()`
`static File`	`getManagedFile(String file, File dir)` If the path dir/file does not exist, look for it in the classpath.
`static File`	`getParentFile(File f)` The method, java.io.File.getParentFile() does not necessarily do what you would think it does.
`static boolean`	`hasExtension(File f, String ext)`
`static boolean`	`hasExtension(String filename, String ext)`
`static boolean`	`hasExtensionIgnoreCase(File f, String ext)`
`static boolean`	`hasExtensionIgnoreCase(String filename, String ext)`
`static boolean`	`isFriendlyFilename(String filename)`
`static boolean`	`isJar(File f)`
`static boolean`	`isJar(String filename)`
`static boolean`	`isLegalFilename(String filename)`
`static boolean`	`isZip(File f)`
`static boolean`	`isZip(String filename)`
`static void`	`liquidate(File parent)`
`static File[]`	`listAllFiles(File dirName, String ext)` Returns an array of abstract pathnames that matches with the given file extension.
`static File[]`	`listFiles(File f)`
`static File[]`	`listFiles(File f, FileFilter ff)`
`static File[]`	`listFiles(File f, FilenameFilter fnf)`
`static String`	`makeForwardSlashes(String inputStr)` Returns a String with uniform slashes such that all the occurances of '\\' are replaced with '/'.
`static String`	`makeFriendlyFilename(String filename)`
`static String`	`makeFriendlyFilenameExtension(String filename)`
`static String`	`makeFriendlyFilenameNoExtension(String filename)`
`static String`	`makeLegalFilename(String filename)`
`static String`	`makeLegalNoBlankFileName(String filename)`
`static boolean`	`mkdirsMaybe(File f)` Wrapper for File.mkdirs This version will return true if the directory exists when the method returns.
`static FileOutputStream`	`openFileOutputStream(File out)` Opens a stream to the specified output file, retrying if necessary.
`static String`	`quoteString(String s)` Given a string (typically a path), quote the string such that spaces are protected from interpretation by a Unix or Windows command shell.
`static String`	`readSmallFile(File file)`
`static String`	`readSmallFile(String fileName)` A utility routine to read a text file efficiently and return the contents as a String.
`static File`	`relativize(File parent, File child)` Given a directory and a fully-qualified file somewhere under that directory, return the portion of the child that is relative to the parent.
`static boolean`	`renameFile(File fromFile, File toFile)` Rename, running gc on Windows if needed to try to force open streams to close.
`static byte[]`	`resourceToBytes(String resourceName)` Read in the given resourceName as a resource, and convert to a byte array
`static String`	`resourceToString(String resourceName)` Read in the given resourceName as a resource, and convert to a String
`static String`	`revertFriendlyFilename(String filename)`
`static String`	`revertFriendlyFilenameExtension(String filename)`
`static File`	`safeGetCanonicalFile(File f)`
`static String`	`safeGetCanonicalPath(File f)`
`static boolean`	`safeIsDirectory(File f)`
`static boolean`	`safeIsDirectory(String s)`
`static boolean`	`safeIsRealDirectory(File f)`
`static boolean`	`safeIsRealDirectory(String s)`
`static List<File>`	`searchDir(File dirName, String ext)` Returns a list of abstract pathnames that matches with the given file extension.
`static boolean`	`whack(File parent)` Deletes a directory and its contents.
`static boolean`	`whack(File parent, Collection<File> undeletedFiles)` Deletes a directory and its contents.
`static void`	`writeStringToFile(String s, File f)` Write the String to a file.

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
  - getParentFile
```
public static File getParentFile(File f)
```
    The method, java.io.File.getParentFile() does not necessarily do what you would think it does. What it really does is to simply chop off the final element in the path and return what is left-over. E.g. if the file is /foo/. then the "parent" that is returned is /foo which is probably not what you expected. This method really returns the parent directory - or null if there is none.
    
    Parameters:
    f -
    
    Returns:
  - mkdirsMaybe
```
public static boolean mkdirsMaybe(File f)
```
    Wrapper for File.mkdirs This version will return true if the directory exists when the method returns. Unlike File.mkdirs which returns false if the directory already exists.
    
    Parameters:
    f - The file pointing to the directory to be created
    
    Returns:
  - deleteFileMaybe
```
public static boolean deleteFileMaybe(File f)
```
    Wrapper for File.delete This version will return true if the file does not exist when the method returns. Unlike File.delete which returns false if the file does not exist.
    
    Parameters:
    f - The file to be deleted
    
    Returns:
  - listFiles
```
public static File[] listFiles(File f)
```
  - listFiles
```
public static File[] listFiles(File f,
               FileFilter ff)
```
  - listFiles
```
public static File[] listFiles(File f,
               FilenameFilter fnf)
```
  - safeIsDirectory
```
public static boolean safeIsDirectory(File f)
```
  - safeIsRealDirectory
```
public static boolean safeIsRealDirectory(String s)
```
  - safeIsRealDirectory
```
public static boolean safeIsRealDirectory(File f)
```
  - safeIsDirectory
```
public static boolean safeIsDirectory(String s)
```
  - safeGetCanonicalPath
```
public static String safeGetCanonicalPath(File f)
```
  - safeGetCanonicalFile
```
public static File safeGetCanonicalFile(File f)
```
  - hasExtension
```
public static boolean hasExtension(String filename,
                   String ext)
```
  - hasExtension
```
public static boolean hasExtension(File f,
                   String ext)
```
  - hasExtensionIgnoreCase
```
public static boolean hasExtensionIgnoreCase(String filename,
                             String ext)
```
  - hasExtensionIgnoreCase
```
public static boolean hasExtensionIgnoreCase(File f,
                             String ext)
```
  - isLegalFilename
```
public static boolean isLegalFilename(String filename)
```
  - isFriendlyFilename
```
public static boolean isFriendlyFilename(String filename)
```
  - makeLegalFilename
```
public static String makeLegalFilename(String filename)
```
  - makeLegalNoBlankFileName
```
public static String makeLegalNoBlankFileName(String filename)
```
  - makeFriendlyFilename
```
public static String makeFriendlyFilename(String filename)
```
  - makeFriendlyFilenameNoExtension
```
public static String makeFriendlyFilenameNoExtension(String filename)
```
  - makeFriendlyFilenameExtension
```
public static String makeFriendlyFilenameExtension(String filename)
```
  - revertFriendlyFilenameExtension
```
public static String revertFriendlyFilenameExtension(String filename)
```
  - revertFriendlyFilename
```
public static String revertFriendlyFilename(String filename)
```
  - liquidate
```
public static void liquidate(File parent)
```
  - isJar
```
public static boolean isJar(String filename)
```
  - isZip
```
public static boolean isZip(String filename)
```
  - isJar
```
public static boolean isJar(File f)
```
  - isZip
```
public static boolean isZip(File f)
```
  - whack
```
public static boolean whack(File parent)
```
    Deletes a directory and its contents.
    If this method encounters a symbolic link in the subtree below "parent" then it deletes the link but not any of the files pointed to by the link. Note that whack will delete files if a symbolic link appears in the path above the specified parent directory in the path.
    
    Parameters:
    parent - the File at the top of the subtree to delete
    
    Returns:
    success or failure of deleting the directory
  - whack
```
public static boolean whack(File parent,
            Collection<File> undeletedFiles)
```
    Deletes a directory and its contents.
    If this method encounters a symbolic link in the subtree below "parent" then it deletes the link but not any of the files pointed to by the link. Note that whack will delete files if a symbolic link appears in the path above the specified parent directory in the path.
    
    Parameters:
    parent - the File at the top of the subtree to delete
    
    Returns:
    success or failure of deleting the directory
  - deleteFileNowOrLater
```
public static void deleteFileNowOrLater(File f)
```
    Delete a file. If impossible to delete then try to delete it when the JVM exits. E.g. when Windows is using a jar in the current JVM -- you can not delete the jar until the JVM dies.
    
    Parameters:
    f - file to delete
  - deleteFileWithWaitLoop
```
public static boolean deleteFileWithWaitLoop(File f)
```
    Delete a file. Will retry every ten milliseconds for five seconds, doing a gc after each second.
    
    Parameters:
    f - file to delete
    
    Returns:
    boolean indicating success or failure of the deletion atttempt; returns true if file is absent
  - deleteFile
```
public static boolean deleteFile(File f)
```
    Delete a file. If on Windows and the delete fails, run the gc and retry the deletion.
    
    Parameters:
    f - file to delete
    
    Returns:
    boolean indicating success or failure of the deletion atttempt; returns true if file is absent
  - openFileOutputStream
```
public static FileOutputStream openFileOutputStream(File out)
                                             throws IOException
```
    Opens a stream to the specified output file, retrying if necessary.
    
    Parameters:
    out - the output File for which a stream is needed
    
    Returns:
    the FileOutputStream
    
    Throws:
    
    IOException - for any errors opening the stream
  - getAllFilesUnder
```
public static Set<File> getAllFilesUnder(File directory,
                         FilenameFilter filenameFilter)
                                  throws IOException
```
    Return a set of all the files (File objects) under the directory specified, with relative pathnames filtered with the filename filter (can be null for all files).
    
    Throws:
    
    IOException
  - getAllFilesUnder
```
public static Set<File> getAllFilesUnder(File directory,
                         FilenameFilter filenameFilter,
                         boolean relativize)
                                  throws IOException
```
    Throws:
    
    IOException
  - getAllFilesAndDirectoriesUnder
```
public static Set<File> getAllFilesAndDirectoriesUnder(File directory)
                                                throws IOException
```
    Throws:
    
    IOException
  - relativize
```
public static File relativize(File parent,
              File child)
```
    Given a directory and a fully-qualified file somewhere under that directory, return the portion of the child that is relative to the parent.
  - formatFileCollection
```
public static String formatFileCollection(Collection<File> files)
```
    Creates a String listing the absolute paths of files, separated by the platform's line separator.
    
    Parameters:
    files - the Collection of File objects to be listed
    
    Returns:
    String containing the absolute paths of the files with the line separator between them
  - getDirectory
```
public static File getDirectory(File f)
```
  - createTempFile
```
public static File createTempFile(File directory)
```
  - listAllFiles
```
public static File[] listAllFiles(File dirName,
                  String ext)
```
    Returns an array of abstract pathnames that matches with the given file extension. If the given abstract pathname does not denote a directory, then this method returns null. If there is no matching file under the given directory and its sub directories, it returns null;
    
    Parameters:
    dirName - dir name under which search will begin
    ext - file extension to look for
    
    Returns:
    an array of abstract pathnames that matches with the extension
  - searchDir
```
public static List<File> searchDir(File dirName,
                   String ext)
```
    Returns a list of abstract pathnames that matches with the given file extension. If the given abstract pathname does not denote a directory, then this method returns null. If there is no matching file under the given directory and its sub directories, it returns an empty list.
    
    Parameters:
    dirName - dir name under which search will begin
    ext - file extension to look for
    
    Returns:
    a list of abstract pathnames of type java.io.File that matches with the given extension
  - copy
```
public static void copy(String from,
        String to)
                 throws IOException
```
    Copies a file.
    
    Parameters:
    from - Name of file to copy
    to - Name of new file
    
    Throws:
    
    IOException - if an error while copying the content
  - copy
```
public static void copy(File fin,
        File fout)
                 throws IOException
```
    Copies a file.
    
    Parameters:
    fin - File to copy
    fout - New file
    
    Throws:
    
    IOException - if an error while copying the content
  - copyTree
```
public static void copyTree(File din,
            File dout)
                     throws IOException
```
    Copies the entire tree to a new location.
    
    Parameters:
    din - File pointing at root of tree to copy
    dout - File pointing at root of new tree
    
    Throws:
    
    IOException - if an error while copying the content
  - makeForwardSlashes
```
public static String makeForwardSlashes(String inputStr)
```
    Returns a String with uniform slashes such that all the occurances of '\\' are replaced with '/'. In other words, the returned string will have all forward slashes. Accepts non-null strings only.
    
    Parameters:
    inputStr - non null String
    
    Returns:
    a String which does not contain `\\` character
  - quoteString
```
public static String quoteString(String s)
```
    Given a string (typically a path), quote the string such that spaces are protected from interpretation by a Unix or Windows command shell. Note that this method does not handle quoting for all styles of special characters. Just for the basic case of strings with spaces.
    
    Parameters:
    s - input string
    
    Returns:
    a String which is quoted to protect spaces
  - getIllegalFilenameCharacters
```
public static String getIllegalFilenameCharacters()
```
  - copyFile
```
public static void copyFile(File fin,
            File fout)
                     throws IOException
```
    This method is used to copy a given file to another file using the buffer sixe specified
    
    Parameters:
    fin - the source file
    fout - the destination file
    
    Throws:
    
    IOException
  - copy
```
public static void copy(InputStream in,
        FileOutputStream out,
        long size)
                 throws IOException
```
    Throws:
    
    IOException
  - copyWithoutClose
```
public static void copyWithoutClose(InputStream in,
                    FileOutputStream out,
                    long size)
                             throws IOException
```
    Throws:
    
    IOException
  - copy
```
public static void copy(InputStream in,
        OutputStream os,
        long size)
                 throws IOException
```
    Throws:
    
    IOException
  - renameFile
```
public static boolean renameFile(File fromFile,
                 File toFile)
```
    Rename, running gc on Windows if needed to try to force open streams to close.
    
    Parameters:
    fromFile - to be renamed
    toFile - name for the renamed file
    
    Returns:
    boolean result of the rename attempt
  - appendText
```
public static void appendText(String fileName,
              String line)
                       throws RuntimeException
```
    Appends the given line at the end of given text file. If the given file does not exist, an attempt is made to create it. Note that this method can handle only text files.
    
    Parameters:
    fileName - name of the text file that needs to be appended to
    line - the line to append to
    
    Throws:
    
    RuntimeException - in case of any error - that makes it callable from a code not within try-catch. Note that NPE will be thrown if either argument is null. Note that this method is not tested with String containing characters with 2 bytes.
  - appendText
```
public static void appendText(String fileName,
              StringBuffer buffer)
                       throws IOException,
                              FileNotFoundException
```
    Throws:
    
    IOException
    
    FileNotFoundException
  - readSmallFile
```
public static String readSmallFile(String fileName)
                            throws IOException,
                                   FileNotFoundException
```
    A utility routine to read a text file efficiently and return the contents as a String. Sometimes while reading log files of spawned processes this kind of facility is handy. Instead of opening files, coding FileReaders etc. this method could be employed. It is expected that the file to be read is small .
    
    Parameters:
    fileName - String representing absolute path of the file
    
    Returns:
    String representing the contents of the file, empty String for an empty file
    
    Throws:
    
    IOException - if there is an i/o error.
    
    FileNotFoundException - if the file could not be found
  - readSmallFile
```
public static String readSmallFile(File file)
                            throws IOException
```
    Throws:
    
    IOException
  - getManagedFile
```
public static File getManagedFile(String file,
                  File dir)
                           throws IOException
```
    If the path dir/file does not exist, look for it in the classpath. If found in classpath, create dir/file.
    
    Parameters:
    file - - path to look for
    dir - - directory where the path file should exist
    
    Returns:
    the File representing dir/file. If that does not exist, return null.
    
    Throws:
    
    IOException
  - writeStringToFile
```
public static void writeStringToFile(String s,
                     File f)
                              throws IOException
```
    Write the String to a file. Then make the file readable and writable. If the file already exists it will be truncated and the contents replaced with the String argument.
    
    Parameters:
    s - The String to write to the file
    f - The file to write the String to
    
    Throws:
    
    IOException - if any errors
  - findFilesInDir
```
public static File[] findFilesInDir(File dir,
                    String regexp)
```
    Find files matching the regular expression in the given directory
    
    Parameters:
    dir - the directory to search
    regexp - the regular expression pattern
    
    Returns:
    either an array of matching File objects or an empty array. Guaranteed to never return null
  - resourceToString
```
public static String resourceToString(String resourceName)
```
    Read in the given resourceName as a resource, and convert to a String
    
    Parameters:
    resourceName -
    
    Returns:
    the contents of the resource as a String or null if absent
  - resourceToBytes
```
public static byte[] resourceToBytes(String resourceName)
```
    Read in the given resourceName as a resource, and convert to a byte array
    
    Parameters:
    resourceName -
    
    Returns:
    the contents of the resource as a byte array or null if absent

Class FileUtils

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

FileUtils

Method Detail

getParentFile

mkdirsMaybe

deleteFileMaybe

listFiles

listFiles

listFiles

safeIsDirectory

safeIsRealDirectory

safeIsRealDirectory

safeIsDirectory

safeGetCanonicalPath

safeGetCanonicalFile

hasExtension

hasExtension

hasExtensionIgnoreCase

hasExtensionIgnoreCase

isLegalFilename

isFriendlyFilename

makeLegalFilename

makeLegalNoBlankFileName

makeFriendlyFilename

makeFriendlyFilenameNoExtension

makeFriendlyFilenameExtension

revertFriendlyFilenameExtension

revertFriendlyFilename

liquidate

isJar

isZip

isJar

isZip

whack

whack

deleteFileNowOrLater

deleteFileWithWaitLoop

deleteFile

openFileOutputStream

getAllFilesUnder

getAllFilesUnder

getAllFilesAndDirectoriesUnder

relativize

formatFileCollection

getDirectory

createTempFile

listAllFiles

searchDir

copy

copy

copyTree

makeForwardSlashes

quoteString

getIllegalFilenameCharacters

copyFile

copy

copyWithoutClose

copy

renameFile

appendText

appendText

readSmallFile

readSmallFile

getManagedFile

writeStringToFile

findFilesInDir

resourceToString

resourceToBytes