EPFLCandidatesReport epflReport = new EPFLCandidatesReport(workbook);
epflReport.build(searchBean);
RecommendationLetterReport recommendationLetterReport = new RecommendationLetterReport(workbook);
recommendationLetterReport.build(searchBean);
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment; filename=phd.xls");
workbook.write(response.getOutputStream());