How to set file permissions in Java?

In general, whenever you create a file you can restrict/permit certain users from reading/writing/executing a file.

In Java files (their abstract paths) are represented by the Files class of the java.io package. This class provides various methods to perform various operations on files such as read, write, delete, rename etc.

In addition, this class also provides the following methods −

• setExecutble() − This method is sued to set the execute permissions to the file represented by the current (File) object.
• setWritable() − This method is used to set the write permissions to the file represented by the current (File) object.
• setReadable() − This method is used to set the read permissions to the file represented by the current (File) object.

Example

Following Java program creates a file writes some data into It and set read, write and execute permission to it.

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
public class FilePermissions {
   public static void main(String args[]) throws IOException {
      String directoryPath = "D:/SampleDirectory";
      String fileName = "example.txt";
      //Creating a directory
      new File(directoryPath).mkdir();
      System.out.println("Directory created.........");
      //Creating a file
      File file = new File(directoryPath+fileName);
      System.out.println("File created.........");
      //Writing data into the file
      FileWriter writer = new FileWriter(file);
      String data = "Hello welcome to Tutorialspoint";
      writer.write(data);
      System.out.println("Data entered.........");
      //Setting permissions to the file
      file.setReadable(true); //read
      file.setWritable(true); //write
      file.setExecutable(true); //execute
      System.out.println("Permissions granted.........");
   }
}

Output

Directory created.........
File created.........
Data entered.........
Permissions granted.........