Java Set File Permissions
Java 7 has introduced PosixFilePermission Enum and java.nio.file.Files includes a method setPosixFilePermissions(Path path, Set<PosixFilePermission> perms) that can be used to set file permissions easily.
Here is a simple program that clearly shows why PosixFilePermission is better.
FilePermissions.java
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package com.journaldev.files; import java.io.File; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.nio.file.attribute.PosixFilePermission; import java.util.HashSet; import java.util.Set; public class FilePermissions { /** * File Permissions Java Example using File and PosixFilePermission * @param args * @throws IOException */ public static void main(String[] args) throws IOException { File file = new File("/Users/pankaj/temp.txt"); //set application user permissions to 455 file.setExecutable(false); file.setReadable(false); file.setWritable(true); //change permission to 777 for all the users //no option for group and others file.setExecutable(true, false); file.setReadable(true, false); file.setWritable(true, false); //using PosixFilePermission to set file permissions 777 Set<PosixFilePermission> perms = new HashSet<PosixFilePermission>(); //add owners permission perms.add(PosixFilePermission.OWNER_READ); perms.add(PosixFilePermission.OWNER_WRITE); perms.add(PosixFilePermission.OWNER_EXECUTE); //add group permissions perms.add(PosixFilePermission.GROUP_READ); perms.add(PosixFilePermission.GROUP_WRITE); perms.add(PosixFilePermission.GROUP_EXECUTE); //add others permissions perms.add(PosixFilePermission.OTHERS_READ); perms.add(PosixFilePermission.OTHERS_WRITE); perms.add(PosixFilePermission.OTHERS_EXECUTE); Files.setPosixFilePermissions(Paths.get("/Users/pankaj/run.sh"), perms); } } |
From the above example, it’s clear that PosixFilePermission provides more options and code is more readable. If you are using Java 7 or above, you should use it for setting file permissions in java.