Creating a temporary file in java can be required in many scenarios, but mostly it will happen during unit tests where you don’t want to store the results. As soon as testcase is finished, you do not care about file content.
Creating temporary file using java.io.File.createTempFile()
This example is simplest and most recommended solution.
public class TemporaryFileExample
{
public static void main(String[] args)
{
File temp;
try
{
temp = File.createTempFile("myTempFile", ".txt");
System.out.println("Temp file created : " + temp.getAbsolutePath());
} catch (IOException e)
{
e.printStackTrace();
}
}
}
Output:
Temp file created : C:\Users\lokesh\AppData\Local\Temp\myTempFile3492283537103788196.txt
Creating temporary file using NIO
public class TemporaryFileExample
{
public static void main(String[] args)
{
try
{
final Path path = Files.createTempFile("myTempFile", ".txt");
System.out.println("Temp file : " + path);
//Delete file on exit
path.toFile().deleteOnExit();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
In-fact in case of unit testing using Junit, you can use TemporaryFolder as well. The TemporaryFolder Rule allows creation of files and folders that are guaranteed to be deleted when the test method finishes (whether it passes or fails).
Happy Learning !!
Himansu
Hi Pankaj,
The only problem which i face while using this api are the random number which get added while creating the file.
[File Name] **** Random Number **** [File Extension]
Is there any way i can handle the name of the temporary file in my way, as certain use case need the file name in
advance.
Regards,
Himansu
Lokesh
You can use “
getName()” method to get the actual file name created.