How can I parse a text file?

Hi all, I have a file call default.cfg , it is actually a simple text file with the following format:

#define ContactSurname=William
#define ContactGiven=Bob
#define ContactPhone=1234567890
#define ContactExt=123
#define EntityName=secret101
#define Street=12 street
#define City=San Francisco
#define Country=USA
#define Zip=123456

and so on and so on.

My question is, how could I create a java program to parse these values such that I could call

return findValue("ContactSurname") then my result would be "William"?
fylix0000Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

BogoJokerCommented:
Hi fylix0000,

Here are the basics of reading a file:http://www.javaalmanac.com/egs/java.io/ReadLinesFromFile.html

If you take the code that is there, you can edit it like this in your findValue function, like so:
You can write this a number of ways, I will make findValue() require the filename and the key your looking for:

public String findValue(String filename, String key)
{
    try
    {
        BufferedReader in = new BufferedReader(new FileReader(filename));
        String str;
        while ((str = in.readLine()) != null)
        {
            if (str.indexOf("#define " + key) != -1)
            {
                in.close();
                return str.substring(str.indexOf("=")+1);
             }
        }
        in.close();
        return null;
    } catch (IOException e) {}
    return null; // <--- this will also happen if there is an IOException, Like file not found
}

Now, you would use that function like:
String surname = findValue("default.cfg", "ContactSurname");  // <-- surname will be William
String willNotFind = findValue("default.cfg", "BlahBlahBlah"); // <-- willNotFind will be null

I hope that helps, any questions on my code or modifications that need to be made?

Also I would suggest you look into Properties files.  It basically lets you do exactly what you want but Java has already made all the code for you.  Check it out:
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Properties.html
Example Usage:
http://www.javaalmanac.com/egs/java.util/Props.html?l=rel

Really nice and easy with Properties Files
Joe P

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
fylix0000Author Commented:
Thank you very much Joe, this solution is exact to the point and simple to do.........two thumbs up
BogoJokerCommented:
Thanks, I'm learning how to answer questions better and better. =)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Java

From novice to tech pro — start learning today.