title: Read using XSSF SAX and stream out data with SXSSF - POI
body: <p>I have to read large sized xlsm with low memory footprint and since apache POI provides XSSF SAX, I should prefer using it. In the first sheet from existing xlsm parsed with SAX, i need to append some data from db and write it out as another xlsm. SXSSF provides streaming write and hence should combine both SAX read and SXSSF write. By this way i think heap size problem can be avoided for large size. 
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  Is this possible using POI or are there any other approach ? <br>
  Kindly suggest me on this approach with any example !</p>