How can I convert POI HSSFWorkbook to bytes?

Question

Calling Simple toBytes() does produce the bytes but exel throws Warning.

Lost Document information

Googling around gave me this

Answer 1

How about:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
workbook.write(baos);
byte[] xls = baos.toByteArray();

In order to get a full excel file out, you must call the write(OutputStream) method. If you want bytes from that, just give a ByteArrayOutputStream