SpringBoot下文件上传与下载的实现
原文:http://blog.csdn.net/colton_null/article/details/76696674
SpringBoot后台如何实现文件上传下载?
最近做的一个项目涉及到文件上传与下载。前端上传采用百度webUploader插件。有关该插件的使用方法还在研究中,日后整理再记录。本文主要介绍SpringBoot后台对文件上传与下载的处理。
单文件上传
// 单文件上传 @RequestMapping(value = "/upload") @ResponseBody public String upload(@RequestParam("file") MultipartFile file) { try { if (file.isEmpty()) { return "文件为空"; } // 获取文件名 String fileName = file.getOriginalFilename(); logger.info("上传的文件名为:" + fileName); // 获取文件的后缀名 String suffixName = fileName.substring(fileName.lastIndexOf(".")); logger.info("文件的后缀名为:" + suffixName); // 设置文件存储路径 String filePath = "D://aim//"; String path = filePath + fileName + suffixName; File dest = new File(path); // 检测是否存在目录 if (!dest.getParentFile().exists()) { dest.getParentFile().mkdirs();// 新建文件夹 } file.transferTo(dest);// 文件写入 return "上传成功"; } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return "上传失败"; }
如果想要修改文件路径及文件名,修改filePath以及fileName即可。
多文件上传
//多文件上传 @RequestMapping(value = "/uploadMore", method = RequestMethod.POST) @ResponseBody public String handleFileUpload(HttpServletRequest request) { List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file"); MultipartFile file = null; BufferedOutputStream stream = null; for (int i = 0; i < files.size(); ++i) { file = files.get(i); String filePath = "D://aim//"; if (!file.isEmpty()) { try { byte[] bytes = file.getBytes(); stream = new BufferedOutputStream(new FileOutputStream( new File(filePath + file.getOriginalFilename())));//设置文件路径及名字 stream.write(bytes);// 写入 stream.close(); } catch (Exception e) { stream = null; return "第 " + i + " 个文件上传失败 ==> " + e.getMessage(); } } else { return "第 " + i + " 个文件上传失败因为文件为空"; } } return "上传成功"; }
文件下载
//文件下载相关代码 @RequestMapping("/download") public String downloadFile(HttpServletRequest request, HttpServletResponse response) { String fileName = "aim_test.txt";// 设置文件名,根据业务需要替换成要下载的文件名 if (fileName != null) { //设置文件路径 String realPath = "D://aim//" File file = new File(realPath , fileName); if (file.exists()) { response.setContentType("application/force-download");// 设置强制下载不打开 response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);// 设置文件名 byte[] buffer = new byte[1024]; FileInputStream fis = null; BufferedInputStream bis = null; try { fis = new FileInputStream(file); bis = new BufferedInputStream(fis); OutputStream os = response.getOutputStream(); int i = bis.read(buffer); while (i != -1) { os.write(buffer, 0, i); i = bis.read(buffer); } System.out.println("success"); } catch (Exception e) { e.printStackTrace(); } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } if (fis != null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } } } } return null; }
springboot 文件上传大小配置
application.properties中添加
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