net.simplace.util.service.IOHelper

provides different helper methods for IO


public final class IOHelper {

// Class Methods
public static final String getFileExtension(String aFullFileName);


returns the extension of a given full File name.
public static final String getFilename(String aFullFileName);


returns the name part of a given full file name (without directory pathes).
public static String getFilenameWithExtension(String aFullFileName);


returns the name with extension of a given full file name (without directory pathes).
public static final Set getAllFileNamesInDirectory(String aDirectory, String
aExtension);


returns all the file names with the given extension in a directory.
public static void writeObjectToFile(File aDestFile, Object aObject)
throws FileNotFoundException, IOException;

Returns the name part of a given full file name (without directory pathes).
public static final Object readObjectFromFile(File aSourceFile)
throws FileNotFoundException, IOException, Exception;


returns the name part of a given full file name (without directory pathes).
public static final void copyFiles(File aSourceDir, File aDesDir)
throws IOException;

Copies the content of the given directory to the given targetdirectory.
public static final void copyFiles(File aSourceDir, File aDesDir, FileFilter
aFileFilter, boolean aShouldOverwrite) throws IOException;

Copies the content of the given directory to the given targetdirectory. Copies only files that match the given FileFilter.
public static void copyDirectory(File aSourceDirectory, File
aDestinationDirectory, boolean aCopySubFolders, boolean aOverwriteCopy)
throws IOException;

copies all contents of one folder to another one. use the last parameter to define, if you want to copy all subfolders including content
public static final void copyFile(File aSourceFile, File aDestFile, boolean
aShouldOverwrite) throws FileNotFoundException, IOException;

Copy a file and create the directory structure for the destination file if it doesnt already exist. Overwrite the destination file if it already exists.
public static final void moveFile(File aSourceFile, File aDestFile, boolean
aShouldOverwrite) throws FileNotFoundException, IOException;

Copy a file and create the directory structure for the destination file if it doesnt already exist. Overwrite the destination file if it already exists.
public static final void addLineToFile(File aFile, String aStringToAppend,
int aMaxKBSizeOfFile) throws IOException;

Constructs a FileWriter object given a File object. String will be written to the end of the file.
public static final String readFirstCharsOfFile(File aFile, int
aNumberOfChars) throws IOException;

Reads the first chars of a File and returns it in a String.
returns the first chars of a File and returns it in a String.
public static final Vector readLinesOfFile(File aFile) throws IOException;

Reads the last line of a File and returns it in a String.
returns the last line of a File and returns it in a String.
public static final Vector readLinesOfFile(File aFile, String encoding)
throws IOException;

Reads the last line of a File and returns it in a String.
returns the last line of a File and returns it in a String.
public static String[][] readFileToArray(File aFileData, String aDivider)
throws IOException;

Reads a file to an array
returns Double array of file content
public static final Vector readLinesOfStream(InputStream aInputStream,
String encoding) throws IOException;

Reads the last line of a File and returns it in a String.
returns line vector of stream
public static String[][] reatStreamToArray(InputStream aInputStream, String
aDivider, String aEncoding) throws IOException;

Reads the last line of a File and returns it in a String.
returns a stream to an array with encoding
public static final void writeLinesOfFile(Vector aLinesVector, File aFile)
throws IOException;

Reads the last line of a File and returns it in a String.
public static final String readLastLineOfFile(File aFile) throws IOException;

Reads the last line of a File and returns it in a String.
returns the last line of a File and returns it in a String.
public static final StringBuffer stringBufferFromInputStream(InputStream
aInputStream) throws IOException;

Read the contents of a String from an InputStream.
returns the contents of a String from an InputStream.
public static final StringBuffer stringBufferFromInputStream(InputStream
aInputStream, String aEncoding) throws IOException;

Read the contents of a String from an InputStream.
returns the contents of a String from an InputStream.
public static final String stringFromInputStream(InputStream aInputStream)
throws IOException;

Read the contents of a String from an InputStream.
returns the contents of a String from an InputStream.
public static final String stringFromInputStream(InputStream aInputStream,
String aEncoding) throws IOException;

Read the contents of a String from an InputStream.
returns the contents of a String from an InputStream.
public static final String encodedStringFromInputStream(InputStream
aInputStream, String aEncoding) throws IOException;

Returns the contents of a String from an InputStream in the given encoded format.
returns the contents of a String from an InputStream.
public static final String encodedStringFromInputStream(InputStream
aInputStream) throws IOException;

Returns the contents of a String from an InputStream in the UTF-8 encoded format.
returns the contents of a String from an InputStream.
public static final String platformDefaultToUTF8(String aString)
throws IOException;

Turns a String which was created using the platform standard encoding to an String which is encoded using UTF-8 encoding.
returns a String as UTF encoding
public static final boolean isXMLFileExtension(String aExtension);


returns if the extension belongs to an UTF-8 encoded XML file.
public static final String UTF8ToPlatformDefault(String aString)
throws IOException;

Turns a String which was created using the UTF-8 encoding to an String which is encoded using platform standard encoding.
returns a String which was created using the UTF-8 encoding
public static final void stringToOutputStream(String aString, OutputStream
aOutputStream) throws IOException;

Write the contents of a String to an OutputStream. The Stream won't be closed at the end.
public static final void stringBufferToOutputStream(StringBuffer
aStringBuffer, OutputStream aOutputStream) throws IOException;

Write the contents of a StringBuffer to an OutputStream. The Stream won't be closed at the end.
public static final void stringToOutputStreamAndClose(String aString,
OutputStream aOutputStream) throws IOException;

Write the contents of a String to an OutputStream. The Stream will be closed at the end.
public static final void stringToOutputStream(String aString, OutputStream
aOutputStream, String aEncoding) throws IOException;

Write the contents of a String to an OutputStream in the given encoding. The Stream won't be closed at the end.
public static final void stringToOutputStreamAndClose(String aString,
OutputStream aOutputStream, String aEncoding) throws IOException;

Write the contents of a String to an OutputStream in the given encoding. The Stream will be closed at the end.
public static final void stringToFile(String aString, File aFile, String
aEncoding) throws IOException;

Write the contents of a String to a File in the given encoding. The Stream will be closed at the end.
public static final void stringToFile(String aString, File aFile)
throws IOException;

Write the contents of a String to a File in platform standard encoding. The Stream will be closed at the end.
public static final void fileToOutputStream(File aFile, OutputStream
aOutputStream) throws IOException;

Copy data from a file to an OututStream.
public static final void fileFromInputStream(File aFile, InputStream
aInputStream) throws IOException;

Copy data from an InputStream to a file.
public static final void copyStream(InputStream aInputStream, OutputStream
aOutputStream) throws IOException;

Copy data from an InputStream to an OutputStream.
public static final void copyStream(Reader aReader, Writer aWriter)
throws IOException;

Copy data from an Reader to an Writer.
public static final void createDir(File aDir) throws IOException;

Create a directory including its parent directories if they dont already exist.
public static final boolean deleteFile(File aFile);

Delete a file if it exists.
returns success
public static final List getFiles(File aFile, boolean aShouldIncludeSubdirs);


returns all the file objects within a directory(and also sub directories) excluding the directories in it (Excluding the directory file objects.).
public static final List getFilesForPattern(File aFile, String
aRegexpPattern, boolean aShouldIncludeSubdirs, boolean aIgnoreCase);


returns all the file objects within a directory(and also sub directories) excluding the directories in it (Excluding the directory file objects.).
public static final void deleteFiles(File aFile) throws IOException;

Deletes all the files in a directory including the sub directories files, if the given file is a directory. !!!The sub directories won't be deleted!!!
public static void deleteFiles(File aSourceDir, FileFilter aFileFilter);

public static final boolean deleteFiles(Collection aFilesCollection);

Deletes all the files in the given FilesCollection returning true if successful
returns success
public static final boolean deleteDir(File dir);

Deletes all the files in a directory including the sub directories files, if the given file is a directory and also the directory.
returns success
public static final boolean deleteDir(File dir, boolean goOnWithError);

Deletes all the files in a directory including the sub directories files, if the given file is a directory and also the directory.
returns success
public static final boolean isEmpty(File aDirectory);


returns if the given directory is an empty directory including sub directories.
public static final boolean deleteDirContents(File dir, boolean goOnOnError);

Deletes all the files in a directory including the sub directories files, if the given file is a directory but does not delete the directory itself.
returns success
public static final boolean deleteDirContents(File aDir, String aExtension,
long aOlderThanMillis);

Deletes all the files in a directory including the sub directories files, if the given file is a directory but does not delete the directory itself. It only deletes files with given extension (or null for all) if last modified date is older than given long-date.
returns success
public static final Collection getDirContents(File aDir, String aExtension,
long aOlderThanMillis);


returns Collection of Files fitting given criteria
public static final Collection getDirectoriesOnly(File aDir);


returns Collection of Directories in aDir
public static final boolean deleteDirContents(File aDir, String aExtension);

Deletes all the files in a directory including the sub directories files, if the given file is a directory but does not delete the directory itself.It only deletes files with given extension
returns success
public static final String returnValidFilename(String aUncheckedFilename);

Replaces all letters that are maybe not supported by system for using in filename. You should only give the filename without path!!!
returns valid file name
public static final String returnValidPath(String aUncheckedFilename);

Replaces all letters that are maybe not supported by system for using in filename. You should only give the filename without path!!! If add/remove characters also change isValidFilename/getInvalidFilenameCharacters
returns valid file name
public static final boolean isValidFilename(String aFilename);

You should only give the filename without path!!! If add/remove characters also change returnValidPath/getInvalidFilenameCharacters
returns if the given filename is valid
public static final String getInvalidFilenameCharacters();

If add/remove characters also change returnValidPath/isValidFilename
returns a string containing all invalid characters.
public static String getFileSizeString(long aByte);


returns a string describing the given byte size
public static String getHostNameOfLocalSystem() throws UnknownHostException;


returns HostName of localhost.
public static String getIPOfLocalSystem() throws UnknownHostException;


returns IP of localhost.
public static String getTemporaryExecutionFilePath(String aFilePath)
throws IOException;


returns If the File with the path is used by an other program a new one wit ~x is created and returned
public static boolean doesPatternFit(String aFileName, List aPatternList,
boolean aIgnoreCase);


returns if the given text fits to any of the given patterns.
public static boolean doesPatternFit(String aFileName, String aPattern,
boolean aIgnoreCase);


returns if the given patterns fit .
public static String getRelativePath(File aFromDir, File aToFileOrDir)
throws IOException;


returns the relative path. The first file is the directory, the second is the file.
public static Collection fillFileCollection(File aDirectory, Collection
aFileCollection, boolean aIncludeDirectories);


returns all files from the collection including dirs if wanted.
public static Collection fillFileCollection(File aDirectory, Collection
aFileCollection, String aExtensionFilter);


returns all files from the collection without directories but only with given Extension - without extension all files are returned.
public static long getFileSize(File aFile, boolean aRecursive);

Returns the size of the given file. If its a directory it will return the total size of all files in it (including the sub directories).
returns file size
public static ArrayList getFilesWithExtension(File aDirectory, String
aExtension);


returns all files in a directory with a given extension
public static ArrayList getFilesWithExtension(File aDirectory, String
aExtension, boolean aIncludeSubDirs);


returns all files in a directory with a given extension
public static byte[] getBytesFromFile(File aFile) throws IOException;


returns the contents of the file in a byte array.
public static boolean isInDirectory(File aFile, File aDirectory);


returns if the given file is a subfile/-directory of the given directory.
public static boolean createLockFile(File aDirectory);

Locks the system.
returns success
public static File getFile(Collection aFileCollection, String aFileName);


returns the given fileList for the also given fileName.
public static URL checkURL(String aURL);


returns the checked URL or null or MalformedURLException
public static boolean areRessourcesCached(Set aRessouceList);


returns if all parts of Resources are cached for Webstart applications
public static void downloadRessources(Set aRessourceList);

checks if resources are available. If not, they are download
public static File chooseFile(String aExtension);


returns the chosen file
public static boolean doesFileExist(String aPath, boolean
aSouldAcceptDirectories);


returns if File exists
public static String[][] readCSVtoArray(File aFile, String aDivider)
throws IOException;


returns the content of the CSV as Array
public static Object resizeArray(Object oldArray, int newSize);

Reallocates an array with a new size, and copies the contents of the old array to the new array.
returns A new array with the same contents.
public static void writeArrayToFile(Object[][] aSumOfCutValues, File aFile,
String aString) throws IOException;

public static void fillWithZero(Number[][] aValuesArray);


}