如何动态创建类文件？

I want to create a class file dynamically. Here it goes... With the given ResultSet, extracting the metadata I want to build a class file dynamically with getter and setter methods for all the columns that exist in ResultSet. Also I should be able to use this class file generated where ever I want in my later use. Can any body suggest me a better way to implement this. Also if any existing jar files available to implement this, that would be helpful. I want to create a class file dynamically. Here