SpringMVC生成任意文件,访问链接即下载

原理上讲就是返回的 ResponseEntity<byte[]> 形式的值就可以了

@RequestMapping("/api/watermark_download")
    public ResponseEntity<byte[]> returnWatermarkImage(HttpServletRequest request, HttpSession session) {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        try {
            File file=new File("文件路径");byte[] test=FileUtils.readFileToByteArray(file);
            return new ResponseEntity<byte[]>(test, headers, HttpStatus.CREATED);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return new ResponseEntity<byte[]>(null, headers, HttpStatus.CREATED);
    }