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Creating a Temporary File Java code example - Click here to copy ->>>
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// -----------------------------------------------------------------------------
// CreateTemporaryFile.java
// -----------------------------------------------------------------------------
/*
* =============================================================================
* Copyright (c) 1998-2005 Jeffrey M. Hunter. All rights reserved.
*
* All source code and material located at the Internet address of
* http://www.idevelopment.info is the copyright of Jeffrey M. Hunter, 2005 and
* is protected under copyright laws of the United States. This source code may
* not be hosted on any other site without my express, prior, written
* permission. Application to host any of the material elsewhere can be made by
* contacting me at jhunter@idevelopment.info.
*
* I have made every effort and taken great care in making sure that the source
* code and other content included on my web site is technically accurate, but I
* disclaim any and all responsibility for any loss, damage or destruction of
* data or any other property which may arise from relying on it. I will in no
* case be liable for any monetary damages arising from such loss, damage or
* destruction.
*
* As with any code, ensure to test this code in a development environment
* before attempting to run it in production.
* =============================================================================
*/
import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.IOException;
/**
* -----------------------------------------------------------------------------
* This program demonstrates how to create a temporary file that will be
* deleted when the program exits.
*
* The Java I/O package contains a method for creating temporary files. The
* method creates a new empty file in the specified directory, using the given
* prefix and suffix strings to generate its name. If this method returns
* successfully then it is guaranteed that:
*
* 1.) The file denoted by the returned abstract pathname did not exist
* before this method was invoked, and
* 2.) Neither this method nor any of its variants will return the same
* abstract pathname again in the current invocation of the virtual
* machine.
*
* This method provides only part of a temporary-file facility. To arrange for
* a file created by this method to be deleted automatically, use the
* deleteOnExit() method.
*
* The prefix argument must be at least three characters long. It is
* recommended that the prefix be a short, meaningful string such as "hjb" or
* "mail". The suffix argument may be null, in which case the suffix ".tmp"
* will be used.
*
* To create the new file, the prefix and the suffix may first be adjusted to
* fit the limitations of the underlying platform. If the prefix is too long
* then it will be truncated, but its first three characters will always be
* preserved. If the suffix is too long then it too will be truncated, but if
* it begins with a period character ('.') then the period and the first three
* characters following it will always be preserved. Once these adjustments
* have been made the name of the new file will be generated by concatenating
* the prefix, five or more internally-generated characters, and the suffix.
*
* If the directory argument is null then the system-dependent default
* temporary-file directory will be used. The default temporary-file directory
* is specified by the system property java.io.tmpdir. On UNIX systems the
* default value of this property is typically "/tmp" or "/var/tmp"; on
* Win32 systems it is typically "c:\\temp". A different value may be given to
* this system property when the Java virtual machine is invoked, but
* programmatic changes to this property are not guaranteed to have any effect
* upon the the temporary directory used by this method.
*
* Parameters:
* prefix - The prefix string to be used in generating the file's
* name; must be at least three characters long
* suffix - The suffix string to be used in generating the file's
* name; may be null, in which case the suffix ".tmp" will
* be used
* directory - The directory in which the file is to be created, or
* null if the default temporary-file directory is to be
* used
* Returns:
* An abstract pathname denoting a newly-created empty file
*
* @version 1.0
* @author Jeffrey M. Hunter (jhunter@idevelopment.info)
* @author http://www.idevelopment.info
* -----------------------------------------------------------------------------
*/
public class CreateTemporaryFile {
private static void doCreate() {
try {
// Create a temporary file object
File tempFile = File.createTempFile("mail", "temp");
System.out.println("\nCreated temporary file: " + tempFile + "\n");
// Delete temp file when program exits
tempFile.deleteOnExit();
// Write to temporary file
BufferedWriter out = new BufferedWriter(new FileWriter(tempFile));
out.write("TEMP FILE: " + tempFile);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Sole entry point to the class and application.
* @param args Array of String arguments.
*/
public static void main(String[] args) {
doCreate();
}
}
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References.
The list of classes which were used on this page you can find below. The
links to Java API contain official SUN documentation about all used classes.
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