How to write test result to an excel file?

I have written groovy script to run a datadriven test.But now i am trying to display the test result of each test case to an excel file.
The format of teh excel will be like this:

Test Name      Test Result
-------------      ----------------
Testcase1      Passed
Testcase2      Failed
Testcase3      Passed

Can someone suggest how to write the result to a excel file in groovy script?

Regards,
Raj