Class IoUtil

Method Details

• copyFile

  public static void copyFile(File src, File dest) throws IOException

  Copies one file, existing file will be overridden.

  Parameters:

  src - source file to copy FROM

  dest - destination file to copy TO

  Throws:

  IOException - if any I/O error has occurred

• copyFolder

  public static void copyFolder(File src, File dest) throws IOException

  Copies folder recursively, existing files will be overridden

  Parameters:

  src - source folder

  dest - target folder

  Throws:

  IOException - if any I/O error has occurred

• copyFolder

  public static void copyFolder(File src, File dest, boolean recursive) throws IOException

  Copies folder, existing files will be overridden

  Parameters:

  src - source folder

  dest - target folder

  recursive - if true, processes folder recursively

  Throws:

  IOException - if any I/O error has occurred

• copyFolder

  public static void copyFolder(File src, File dest, boolean recursive, boolean onlyNew) throws IOException

  Copies folder.

  Parameters:

  src - source folder

  dest - target folder

  recursive - if true, processes folder recursively

  onlyNew - if true, target file will be overridden if it is older than source file only

  Throws:

  IOException - if any I/O error has occurred

• copyFolder

  public static void copyFolder(File src, File dest, boolean recursive, boolean onlyNew, FileFilter filter) throws IOException

  Copies folder.

  Parameters:

  src - source folder

  dest - target folder

  recursive - if true, processes folder recursively

  onlyNew - if true, target file will be overridden if it is older than source file only

  filter - file filter, optional, if null all files will be copied

  Throws:

  IOException - if any I/O error has occurred

• copyStream

  public static void copyStream(InputStream in, OutputStream out, int bufferSize) throws IOException

  Copies streams.

  Parameters:

  in - source stream

  out - destination stream

  bufferSize - buffer size to use

  Throws:

  IOException - if any I/O error has occurred

• emptyFolder

  public static boolean emptyFolder(File folder)

  Recursively deletes whole content of the given folder.

  Parameters:

  folder - folder to be emptied

  Returns:

  true if given folder becomes empty or not exists

• compareFiles

  public static boolean compareFiles(File file1, File file2)

  Compares two files for directories/files synchronization purposes.

  Parameters:

  file1 - one file to compare

  file2 - another file to compare

  Returns:

  true if file names are equal (case sensitive), files have equal lengths and modification dates (milliseconds ignored)

  See Also:

  • synchronizeFolders(File, File)
  • compareFileDates(Date, Date)

• compareFileDates

  public static boolean compareFileDates(Date date1, Date date2)

  For some reason modification milliseconds for some files are unstable, use this function to compare file dates ignoring milliseconds.

  Parameters:

  date1 - first file modification date

  date2 - second file modification date

  Returns:

  true if files modification dates are equal ignoring milliseconds

• synchronizeFolders

  public static void synchronizeFolders(File src, File dest) throws IOException

  Performs one-way directories synchronization comparing files only, not folders.

  Parameters:

  src - source folder

  dest - target folder

  Throws:

  IOException - if any I/O error has occurred

  See Also:

  • synchronizeFolders(File, File, FileFilter)
  • compareFiles(File, File)

• synchronizeFolders

  public static void synchronizeFolders(File src, File dest, FileFilter filter) throws IOException

  Performs one-way directories synchronization comparing files only, not folders.

  Parameters:

  src - source folder

  dest - target folder

  filter - file filter, optional, if null all files will be included into synchronization process

  Throws:

  IOException - if any I/O error has occurred

  See Also:

  • compareFiles(File, File)

• isResourceExists

  public static boolean isResourceExists(URL url)

  Checks if resource exist and can be opened.

  Parameters:

  url - absolute URL which points to a resource to be checked

  Returns:

  true if given URL points to an existing resource

• getResourceInputStream

  public static InputStream getResourceInputStream(URL url) throws IOException

  Opens input stream for given resource. This method behaves differently for different URL types:

  • for local files it returns buffered file input stream;
  • for local JAR files it reads resource content into memory buffer and returns byte array input stream that wraps those buffer (this prevents locking JAR file);
  • for common URL's this method simply opens stream to that URL using standard URL API.

  It is not recommended to use this method for big resources within JAR files.

  Parameters:

  url - resource URL

  Returns:

  input stream for given resource

  Throws:

  IOException - if any I/O error has occurred

• url2file

  public static File url2file(URL url)

  Utility method to convert local URL to a File object.

  Parameters:

  url - an URL

  Returns:

  file object for given URL or null if URL is not local

• file2url

  public static URL file2url(File file) throws MalformedURLException

  Utility method to convert a File object to a local URL.

  Parameters:

  file - a file object

  Returns:

  absolute URL that points to the given file

  Throws:

  MalformedURLException - if file can't be represented as URL for some reason