Spring mvc下载文件java代码

/**
     * 下载模板文件
     * @author cq
     */
        @RequestMapping("/downloadExcel.do")
        public ResponseEntity<byte[]> download() throws IOException {
            String path=servletContext.getRealPath("/")+"uploadFiles/file/purchase_modal.xls";
            File file=new File(path);
            HttpHeaders headers = new HttpHeaders();
            String fileName=new String("批量导入模板.xls".getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题
            headers.setContentDispositionFormData("attachment", fileName);
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED);
        }