How to change permissions to incoming file in linux using JAVA

Question

Objective

I want that whenever someone uploads a file (name is Accounts 0998.csv ) in /opt/file/incoming directory. Its permissions gets change to chmod 664 ie rw-rw-r I am using linux.

I want to automate this process so I am writing a java program but its working

package com.reader.file;

import java.io.File;
import java.io.IOException;

public class GrantPermission
{
    public static void main( String[] args )
    {
        try {

          File file = new File("/opt/file/Accounts 0998.csv");

         if(file.exists()){
             System.out.println("File exists.");

            //using PosixFilePermission to set file permissions 664

            Set<PosixFilePermission> perms = new 

            HashSet<PosixFilePermission>();

            //add owners permission
            perms.add(PosixFilePermission.OWNER_READ);
            perms.add(PosixFilePermission.OWNER_WRITE);

            //add group permissions
            perms.add(PosixFilePermission.GROUP_READ);
            perms.add(PosixFilePermission.GROUP_WRITE);

            //add others permissions
            perms.add(PosixFilePermission.OTHERS_READ);

            Files.setPosixFilePermissions(file.toPath(), perms);

            } catch (IOException e) {

                e.printStackTrace();
            }
         }
         else{
              System.out.println("File does not exists.");
         }

        } catch (IOException e) {
          e.printStackTrace();
        }
    }
}

Additional Information

I am using WSO2 ESB it first search for a file then If file exists then I want to change its permission (via using Class mediator ie JAVA ) and then move it to another directory but my GOAL is change file permissions to rw-rw-r

Answer 1

You can use NIO.2 if you are using java7 or later.

See:

How do i programmatically change file permissions?

 //if you need rw-rw-r permissions public void setPermission(File file) throws IOException{ Set<PosixFilePermission> perms = new HashSet<>(); perms.add(PosixFilePermission.OWNER_READ); perms.add(PosixFilePermission.OWNER_WRITE); perms.add(PosixFilePermission.OTHERS_READ); perms.add(PosixFilePermission.OTHERS_WRITE); perms.add(PosixFilePermission.GROUP_READ); Files.setPosixFilePermissions(file.toPath(), perms); }