test whether a file exists or not

Hello all,

I'm developing an application designed to return records along with any associated images. The images will be named after the records primary key; ie "102.jpg". I'm going to display the full record information on one jsp and provide a link to another jsp to display the image, via a button/link whatever.

The problem is that not all records have associated images. I have to engineer the system such that the link appears ONLY when an image is present in the img directory. How can I test at runtime whether file 102.jpg is present?

Thanks!

Hmmm... where in the API do you suppose there would be a method to tell if a file exists?
And what would be its name?

are you using a database in your application?

Right . . . I've found plenty of reference to a FindFile class/object/something but it doesn't appear to be available to my application as it stands. How do I get access to this?

thanks!

Look at the API documentation of class java.io.File.

You don't need a FindFile class/object/something (that's not part of the standard API).

Hi,

I think from the primary key you can get the file name. Then when you use the following code,
File f = new File("File name");
if(f.exists()) {
//your file exists
} else {
//file doesn't exist.
}

Hope this clears your doubt.

Regards
Shobhana

Davemere,

I guess you missed it on your way in, buy your display name doesn't quite meet up with our Naming Policy. In short, you must have a real (sounding) first name, a space, and a last name.

Would you be so kind as to update yours here?

thanks, pardner!!!

Jesper, Shobhana, thanks for your informative replies - it's all working now!

Jeff - whereas this solution is obviously clear to one as Sun-certified as yourself, sometimes they are less so to those of us with less experience. Half a reply isn't much use when you're on a deadline.

Dave,

I was trying to follow the Java Ranch credo of "Give a man a fish... Teach a man to fish..."

Half a reply isn't much use when you're on a deadline.

Following Dave's advice would have been a * of alot faster than waiting for a reply. Get familiar with the basic Java library if you are using java.io classes it should be obvious that they use the java.io.File class to represent the disk file.
Bill