如何在selenium webdriver中检入存在的工作簿或不使用JXL ?

I want to check that in workbook it contain sheet name "Login" or not. If it exist then in these I want to write data row=row+1, else write directly and then close the report. So, can anybody let me know how to do it. I want to do it in below method.I want to check that in workbook it contain she