I need to get files with different timespan 1hr, 1day.1 week

Question

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i have a folder with different files with different dates i need to get if one hour file is there or not,need to display file name
after that 1 day file need to displayed

after 1 week file name should be displayed ..
Ex:

31-05-2018 folder inside filename is like these : 31-05-2018_10-42-25_rakesh_hike_load_608_output.txt if i need to enter 1 day details i need to display that file

What I have tried:

Java

<pre>package hellomongo;

import java.io.File;
import java.util.Date;

public class Timedate {
	     
	


	 public static void main(String[] args)
	{
	  String path = "/home/msr/hike";

	  String files;
	  File folder = new File(path);
	  File[] listOfFiles = folder.listFiles();

	 for (int i = 0; i < listOfFiles.length; i++)
	  {
		  System.out.println(listOfFiles[i].getName()+"\t"+new Date(listOfFiles[i].lastModified()));

	  }
	}
	
	        }

Posted 30-May-18 23:48pm

Member 13809409

Updated 31-May-18 1:02am

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Richard MacCutchan 31-May-18 6:53am

What is the question?

1 solution

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Jochen Arndt · Answer 1 · 2018-05-31T01:04:00

Solution 1

Use a FilenameFilter (Java Platform SE 7 )[^] and pass that to listFiles():

Java

FilenameFilter fileNameFilter = new FilenameFilter() {
    @Override
    public boolean accept(File dir, String name) {
        // Hourly files
        String match = String.format("%02d-%02d-%04d_%02d", day, month, year, hour);
        // Use this for daily files
        //String match = String.format("%02d-%02d-%04d", day, month, year);
        // When having a Date or Calendar use (without "_%1$tH" for daily)
        //String match = String.format("%1$td-%1$tm-%1$tY_%1$tH", date);
        return name.startsWith(match);
    }
};
File[] listOfFiles = folder.listFiles(fileNameFilter);

The above will work for hourly and daily files. Weekly files is more complicated and requires for example creating seven day match strings (as array) and comparing against all. Then using the Calendar (Java Platform SE 7 )[^] type and incrementing that in the loop is easier than doing the date calulation manually (the Java Date type has no add method while the Calendar type has).

Posted 31-May-18 1:04am

Jochen Arndt

Updated 31-May-18 4:07am

v2

Comments

Member 13809409 31-May-18 8:55am

shall i need to declare variables day,month,year,hour?

Jochen Arndt 31-May-18 9:01am

If you are going to use them. You have not told us how the date to be looked for is specified.

"how to read files there"
Probably by getting each name from the listOfFiles[] array and opening them?
It depends on what are going to do with the files.

Member 13809409 31-May-18 9:02am

day, month, year, hour these variables getting error

Jochen Arndt 31-May-18 9:06am

It is example code showing you how to do it in general.

But you have to specify first for which day, hour, or week you want to get the file names and put that information into some variables. That might be multiple variables for each part or a Data or Calendard.

Member 13809409 31-May-18 9:11am

am not able to do still getting errors

Jochen Arndt 31-May-18 9:22am

I'm neither able to do because I still don't know how the search criteria are actually defined.

For a start with your example use:
int day = 31;
int month = 5;
int year = 2018;
int hour = 10;
or
Calendar date;
date.set(2018, 5, 31, 10, 0);

Member 13809409 31-May-18 9:37am

its not working

Jochen Arndt 31-May-18 10:04am

Please have in mind that I did not have to access to your HDD or can read your mind.

However, the @override must be just before the accept function. I will correct that.

"Is not working" is not meaningful. Do you get compilation errors?
If so, check the line number mentioned in the error. Have a look at that line and what is complained about it.