How to return excel file via Servlet Response?

Question

I have an ajax call which calls the ExcelFileServlet which creates a XSSF Workbook (Apache POI). The java script call is as below :

$.ajax({
    type: "GET",
    url: "./ExcelFileServlet",
    async: true,
    data: { dataRows: JSON.stringify(dataRows.toArray()) },
    success: function(responseText, textStatus, request) {
        console.log(responseText);
    }
});

The ExcelFileServlet code is as below:

@WebServlet("/ExcelFileServlet")
public class ExcelFileServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private Gson gson;
    private XSSFWorkbook workbook;
    
    public ExcelFileServlet() {
        super();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        //PrintWriter out = response.getWriter();
        
        List<Bean> beanList = new ArrayList<Bean>();
        
        JSONArray arr; 
        
        try {
            
            //Processing here to get beanList
            
            //response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            //response.setContentType("application/vnd.ms-excel");
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment; filename=\"BeanFile.xlsx\"");
            response.setStatus(HttpServletResponse.SC_OK);
            
            ExcelUploadFactory euf = new ExcelUploadFactory();
            
            workbook = euf.createExcelFile(beanList); // Creates the workbook here
            
            try(OutputStream os = response.getOutputStream()) {
                workbook.write(os);
                workbook.close();
                os.flush();
                os.close();
            } catch(Exception E) {
                E.printStackTrace();
                Configuration.getInstance().getTelemetry().trackException(E);
            }
            
            //workbook.write(response.getOutputStream());
            
        } catch (JSONException e) {
            e.printStackTrace();
            Configuration.getInstance().getTelemetry().trackException(e);
        } catch (Exception e) {
            e.printStackTrace();
            Configuration.getInstance().getTelemetry().trackException(e);
        }
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //Code Here
    }

}

I have tried setting up different content types for the Response but I am getting vague characters as the response and the file is not getting downloaded. What change do I need to make for it to enable me to get the excel file as the response?