Read Date on File? 1

[TGJ]

Hi, I am wondering how I can read the "Date Modified" property of a file that my Java program is accessing.

Thanks,
Terry

 

[new2this2002]

you can use the 'lastModified()' method of the File class, it returns a long value, you can then use the 'setTimeInMillis()' method of the Calendar class, from there you can get the various parts of the modified date/time of the file

http://java.sun.com/j2se/1.4.2/docs/api/java/io/File.html

http://java.sun.com/j2se/1.4.2/docs/api/java/util/Calendar.html

 

[TGJ]

After creating and writing to a file, how can I reference that file later (after it is closed) to see the "last date modified". ie how can I open the file again without altering it in order to call the lastmodified() function?

Thanks,
Terry

 

[sedj]

Calling File.lastModified() does not alter the "modified" date - so just call :

Date d = new Date(new File(myFileName).lastModiied());

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[Diancecht]

This isn't supposed to modify the modification date.

java.io.File f = new java.io.File("path);
System.out.println(f.lastModified());

Cheers,
Dian

 

[TGJ]

Thanks for the replies, I think both should work but I am having some troubles.

The lastmodified() function returns a "long" value.
This is what my code now looks like:


File test = new File ("C:\\dipdata\\BatchImport\\BatchImport1");

long d = test.lastModified();


"d" gets a value of 0. I am not sure what is wrong with the code, the BatchImport1 file does exist, any ideas??

Thanks.

 

[sedj]

I expect your file does not exist - test for it first and handle the error :

File test = new File ("C:\\dipdata\\BatchImport\\BatchImport1");

if (!test.exists()) {
  // handle error
}
long d = test.lastModified();

--------------------------------------------------
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http://www.primrose.org.uk

 

[TGJ]

Hmmm... it appears to the program that it doesn't exist, yet I can see it in that particular directory. Any idea why it can not see the file?

 

[sedj]

Well, I can pretty much assure you that if the code says your file does not exist ... then it does not exist. You must have made a typo ...

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http://www.primrose.org.uk

 

[TGJ]

Man I am dumb, I forgot the .txt, thanks for the help guys.