使用springmvc实现文件下载有两种方式,都须要设置response的Content-Disposition为attachment;filename=test2.png
前端
第一种能够直接向response的输出流中写入对应的文件流java
第二种可使用 ResponseEntity<byte[]>
来向前端返回文件spring
@RestController @RequestMapping("/download") public class DownloadController { @RequestMapping("/d1") public ResultVo<String> downloadFile(HttpServletResponse response){ String fileName="test.png"; try { //获取页面输出流 ServletOutputStream outputStream = response.getOutputStream(); //读取文件 byte[] bytes = FileUtils.readFileToByteArray(new File("D:\\my-study\\test2.png")); //向输出流写文件 //写以前设置响应流以附件的形式打开返回值,这样能够保证前边打开文件出错时异常能够返回给前台 response.setHeader("Content-Disposition","attachment;filename="+fileName); outputStream.write(bytes); outputStream.flush(); outputStream.close(); return ResultVoUtil.success("success"); } catch (IOException e) { return ResultVoUtil.error(e); } } }
推荐使用这种方式,这种方式能够以json形式给前台返回提示信息。json
@Controller @RequestMapping("/download2") public class DownloadController2 { private final static Logger logger= LoggerFactory.getLogger(CategoryDataController.class); @GetMapping("/d2") public ResponseEntity<byte[]> download2(){ //获取文件对象 try { byte[] bytes = FileUtils.readFileToByteArray(new File("D:\\my-study\\bill-admin\\test2.png")); HttpHeaders headers=new HttpHeaders(); headers.set("Content-Disposition","attachment;filename=test2.png"); ResponseEntity<byte[]> entity=new ResponseEntity<>(bytes,headers,HttpStatus.OK); return entity; } catch (IOException e) { logger.error("下载出错:",e); return null; } } }