Temporary files in Java

In some scenarios, such as unit testing, or some application logic, you may need to create temporary files.

Create temporary files

The File class in Java provides a method named createTempFile(). This method accepts two String variables representing the prefix (starting name) and suffix (extension) of the temporary file and a File object representing the directory (abstract path) where the file needs to be created.

Example

The following Java example creates a temporary file named exampleTempFile5387153267019244721.txt in the path D:/SampleDirectory

import java.io.File;
import java.io.IOException;
public class TempararyFiles {
   public static void main(String args[]) throws IOException {
      String prefix = "exampleTempFile";
      String suffix = ".txt";
      //Creating a File object for directory
      File directoryPath = new File("D:/SampleDirectory");
      //Creating a temp file
      File.createTempFile(prefix, suffix, directoryPath);
      System.out.println("Temp file created.........");
   }
}

Output

Temp file created.........

Delete temporary files

The File class provides the delete() method, which can delete the current file or directory and call this method on the temporary file.

Example

The following Java program creates and deletes temporary files.

import java.io.File;
import java.io.IOException;
public class TempararyFiles {
   public static void main(String args[]) throws IOException {
      String prefix = "exampleTempFile";
      String suffix = ".txt";
      //Creating a File object for directory
      File directoryPath = new File("D:/SampleDirectory");
      //Creating a temp file
      File tempFile = File.createTempFile(prefix, suffix, directoryPath);
      System.out.println("Temp file created: "+tempFile.getAbsolutePath());
      //Deleting the file
      tempFile.delete();
      System.out.println("Temp file deleted.........");
   }
}

Output

Temp file created: D:\SampleDirectory\exampleTempFile7179732984227266899.txt
Temp file deleted.........

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