CODEWITHSUNDEEP
java
user3130755
user3130755

Reputation: 9

To store last timestamp of a file in java

I have written a piece of code to compare time stamp to check for file modification

Here is the code

private long timeStamp;
private File file;

private boolean isFileUpdated(File file)
{
  this.file = file;
  this.timeStamp = file.lastModified();
  if (this.timeStamp != timeStamp)
  {
   this.timeStamp = timeStamp;
   // Yes, file is updated
   return true;
  }
  // No, file is not updated
  return false;
}

public static void main(String[] args)
{
  Test test=new Test();
  File testFile=new File("D:/Test/Test.txt");
  boolean result=test.isFileUpdated(testFile);
  System.out.println("the result is  " + result);
}

The problem with this code is it doesn't maintain any history of timestamp. So do I need to place the timestamp in a txt file so that it reads from the txt file and compares it will current lastmodifieddate and if there is change that means a file has been modified?

Upvotes: 0

Views: 234

Answers (1)

Mike Thomsen
Mike Thomsen

Reputation: 37506

This will write your history for you:

PrintWriter writer = new PrintWriter(FileWriter(new File("log.log"), true));
//true for append mode
writer.println(file.lastModified());
writer.close();

You can read it in with a Scanner like this

Scanner s = new Scanner(new File("log.log"));
String line = null;
while (s.hasNextLine()) {
    line = s.nextLine();
}
s.close();
//line is the last line read

Upvotes: 1

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