How to get last updated file in a directory using Java?

Question

I have a web application developed using Struts2. In my web application I have a link using which users can download a zip file. I need to create this zip file at run time based on some conditions. How can I do this in Struts2?

Answer 1

/*
  Get Last modification time of a file or directory
  This Java example shows how to determine last modification time of a particular
  file or directory using lastModified method of Java File class.
*/

import java.io.*;
import java.util.Date;

public class GetLastModificationTimeOfAFile {

  public static void main(String[] args) {

    //create file object
    File file = new File("C://FileIO//demo.txt");

    /*
     * To determine last modification time of a particular file or directory, use
     * long lastModified() method of Java File class.
     *
     * This method returns long representing the time file was last modified as
     * milliseconds since Jan 01, 1970 00:00:00. This
     * method returns 0L if the file does not exists or in case of IOException.
     *
     */

     long lastModified = file.lastModified();

     System.out.println("File was last modifed at : " + new Date(lastModified));
  }
}

/*
Typical output would be
File was last modifed at : Sun Jan 06 18:24:01 EST 2008
*/