使用apache poi将数据库查询结果导出为excel

I went through some sample codes to export data to excel using Apache POI. However, I am not sure as to how we can export database query results to an excel file. I know that we must create cells in rows and then set values to the cell. But I already have the data in the resultset and must just export the same to an excel file. Can anyone provide me a small/easy code to do the same. I went through some sample codes to export data