Java Utililty Methods Temp File Create

List of utility methods to do Temp File Create

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Description

The list of methods to do Temp File Create are organized into topic(s).

Method

FilecreateTempFile(@Nonnull String prefix, @Nonnull String suffix, @Nullable File parentDir)
Creates a temporary file 
Random rand = new Random();
String parent = parentDir == null ? System.getProperty("java.io.tmpdir") : parentDir.getPath();
DecimalFormat fmt = new DecimalFormat("#####");
File result;
do {
    result = new File(parent, prefix + fmt.format(Math.abs(rand.nextInt())) + suffix);
} while (result.exists());
return result;
...
FilecreateTempFile(final String file, final String ext)
create Temp File 
File f = new File(file);
String filename = f.getName();
if (filename == null) {
    filename = "export";
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddhhmm");
String date = formatter.format(new Date());
filename = filename + "_" + date + "_";
...
FilecreateTempFile(String oriFileName)
create Temp File 
return new File(System.getProperty("java.io.tmpdir"),
        new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()) + "_" + new Random().nextInt(99999)
                + "_" + oriFileName);
FilegetTempFile()
get Temp File 
File f = File.createTempFile("tmp", ".html", null);
tempFiles.add(f);
return f;
FilegetTempFile()
get Temp File 
return File.createTempFile("temp", Long.toString(System.nanoTime()));
FilegetTempFile(File file)
create a empty temp file at file's directory, temp file's name is based on file's name, i.e. 
File tempFile;
while (true) {
    tempFile = new File(file.getParent(), file.getName() + ".tmp." + FILENAME_RANDOM.nextInt());
    if (!tempFile.exists()) {
        if (!tempFile.createNewFile()) {
            throw new IOException(String.format("create %s failed", tempFile));
        return tempFile;
...
FilegetTempFile(File parent, String fileName)
Getting a temp file object in the directory in temporal directory which is referrenced by System.getProperty("java.io.tmpdir") . 
return new File(new File(getTempDirectory(), parent.getPath()), fileName);
FilegetTempFile(final File stackFile)
get Temp File 
return new File("/tmp/" + stackFile.getName() + ".tmp");
FilegetTempFile(final String directory, final String suffix, boolean autodelete)
Creates a temporary file in the given directory, with the given suffix. 
int num = randomNumberGenerator.nextInt(Integer.MAX_VALUE);
File file = new File(directory + File.separator + String.format("%06d.%s", num, suffix));
while (file.exists()) {
    num = randomNumberGenerator.nextInt(Integer.MAX_VALUE);
    file = new File(directory + File.separator + String.format("%06d.%s", num, suffix));
if (!file.createNewFile()) {
    throw new IOException("Failed to create file " + file.getAbsolutePath());
...
FilegetTempFile(final String name)
get Temp File 
return new File("temp" + File.separator + "test", name).getCanonicalFile();