Java — Create Read only file or Mark a file as Read only | Code Factory

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You’ll learn how to create a read only file or mark an existing file as read only.

Java create Read only file

The following example demonstrates how to create a read-only file using the method of class.

package com.example.java.programming.file;import java.io.IOException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.PosixFilePermissions;
import java.util.Set;
/**
* @author code.factory
*
*/
public class CreateReadOnlyFileExample {
public static void main(String... args) {
try {
// File Path
Path filePath = Paths.get("test.txt");
// File permissions (Read only for USER, GROUP, and OTHER)
Set<PosixFilePermission> permissions = PosixFilePermissions.fromString("r--r--r--");
FileAttribute<Set<PosixFilePermission>> fileAttributes = PosixFilePermissions.asFileAttribute(permissions);
// Create a file at the given file path with the given attributes
Files.createFile(filePath, fileAttributes);
System.out.println("Read only file created successfully");
} catch (FileAlreadyExistsException e) {
System.out.println("File already exists");
} catch (IOException e) {
System.out.println("An I/O error occurred: " + e.getMessage());
} catch (SecurityException e) {
System.out.println("No permission to create file: " + e.getMessage());
}
}
}

Create a Read only file or Mark a file as Read only

There is another way to create a read only file or mark an existing file as read only using the java.io.File class’s or methods. The following example demonstrates the usage.

Note: you should try to use the previous method because that’s extensible and gives you more control.

package com.example.java.programming.file;import java.io.File;
import java.io.IOException;
/**
* @author code.factory
*
*/
public class CreateReadOnlyFileExample {
public static void main(String... args) {
try {
// File Path
File file = new File("test.txt");
boolean isCreated = file.createNewFile();
if (isCreated) {
System.out.println("File created successfully");
boolean success = file.setReadOnly(); // or file.setWritable(false);
if (success) {
System.out.println("File marked as read only");
} else {
System.out.println("File could not be marked as read only");
}
} else {
System.out.println("File already exists");
}
} catch (IOException e) {
System.out.println("An I/O error occurred: " + e.getMessage());
} catch (SecurityException e) {
System.out.println("No permission to create file: " + e.getMessage());
}
}
}