You can add SVN properties to your files with these two simple steps:
Step 1: Set svn:keywords property to the file.
$ svn propset svn:keywords "Rev" MyClass.java
Rev (or Revision) is not the only keyword to be used for substitution. The others are Date, Author, HeadURL and Id. You can also use more than one of these keywords at the same time by giving a space between them.
If you are using Eclipse, just give Team>Set Property command for the file to do the same operation.

Step 2: Add keywords in your file
Now add these keywords you wish to be replaced anywhere in your file between two $ characters, such as:
/*
* Revision No : $Rev$
* Last changed on: $Date$
*/
After that, each time you commit your file to SVN, your keywords will be changed with the actual values.
/*
* Revision No : $Rev: 7 $
* Last changed on: $Date: 2009-10-11 15:48:24 +0300 (Sun, 11 Oct 2009) $
*/
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Cool, I always wondered how people did that.