If you are using Selenium IDE, export your script to JUNIT ( java), then create a java project using that java file, then download the Selenium server library (jar file) and add to your project. then start the selenium server and run your script it should run successfully.
If it is working then you can simply use a java code to read files and set the values in the relevant places in your code.
ex: if you are using excel you can use jxl.jar library
You may refer my blog for more details. http://hrftools.blogspot.com/
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