Spring Excel Download returning random data in file

 

This question already has an answer here:

  • What is a correct mime type for docx, pptx etc? 4 answers

    • I think this is not application/xls but rather 

    application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

    as seen in this answer.

    EDIT

    The syntax of the Content-Disposition header is incorrect: The filename should be in double quotes. 

    response.setHeader("Content-Disposition","attachment; filename=""+ accountNumber+ ".xlsx"");
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