Resource resource =
new DefaultResourceLoader().getResource("classpath:download/WORKER_OVERTIME_RECORD.xlsx"
);
response.setContentType("application/x-msdownload;"
);
response.setHeader("Content-disposition", "attachment; filename=WORKER_OVERTIME_RECORD.xlsx"
);
// response.setHeader("Content-Length", String.valueOf(resource.get));
FileCopyUtils.copy(resource.getInputStream(),response.getOutputStream());
只能用inputstream， 不能是file
