How to make it as downloadable excel file using servlets

Question

I am reading a txt file and writing it into excel file, but while making it as downloadable excel file it is not writing any data to excel and giving showing this message

Answer 1

Your writeDataToExcelFile method writes the Excel data into a FileOutputStream - this is not connected to the response OutputStream.

You should update the writeDataToExcelFile method to include another parameter:

private void writeDataToExcelFile(String string, 
                                  ArrayList> excelData,
                                  OutputStream outputStream) 

and the writing of the data, change to this:

myWorkBook.write(outputStream);

This should then permit the myWorkBook object to write back to the browser.

Also, change the line that calls the method to:

writeDataToExcelFile("praveen",exceldata, response.getOutputStream());