在很多现实情况下，我们都会遇到过上传下载的问题，那么运用springboot框架如何实现上传下载呢，话不多说，直接上代码
html页面代码，分成了三部分单文件上传，多文件上传，下载
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"></meta> <title>Insert title here</title> </head> <body> <form action="http://localhost:8080/test/onceupload" method="post" enctype="multipart/form-data"> <p>单文件上传：</p> <br /> <input type="file" name="file1" /> <input type="submit" value="上传" /> </form> <form action="http://localhost:8080/test/manyupload" method="post" enctype="multipart/form-data"> <p>多文件上传</p><br/> <input type="file" name="file2"/> <input type="file" name="file2"/> <input type="file" name="file2"/> <input type="submit" value="上传多文件"/> </form> <a href="http://localhost:8080/test/downLoad">下载</a> </body> </html>
单文件上传
@RequestMapping(value = "/onceupload") public String uploadOnce(HttpServletRequest request, MultipartHttpServletRequest multiRequest) { // 获取上传文件的路径 String uploadFilePath = multiRequest.getFile("file1").getOriginalFilename(); System.out.println("uploadFilePath:" + uploadFilePath); // 截取上传文件的文件名 String uploadFileName = uploadFilePath.substring(uploadFilePath.lastIndexOf('\') + 1, uploadFilePath.indexOf('.')); System.out.println("uploadFileName:" + uploadFileName); // 截取上传文件的后缀 String uploadFileSuffix = uploadFilePath.substring(uploadFilePath.indexOf('.') + 1, uploadFilePath.length()); System.out.println("uploadFileSuffix:" + uploadFileSuffix); FileOutputStream fos = null; FileInputStream fis = null; String newPath = "E:\" + System.nanoTime() + uploadFileSuffix; try { fis = (FileInputStream) multiRequest.getFile("file1").getInputStream(); fos = new FileOutputStream(new File(newPath)); byte[] bytes = new byte[1024]; int i = fis.read(bytes); while (i != -1) { fos.write(bytes, 0, bytes.length); fos.flush(); i = fis.read(bytes); } return "admin/login";//这里根据自己实际情况返回路径
} catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); return "error"; } finally { // 关流 if (fis != null) { try { fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (fos != null) { try { fos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }
多文件上传
@RequestMapping(value="manyupload") public String manyUpload(HttpServletRequest request, MultipartHttpServletRequest multiRequest) { List<MultipartFile> multipartFiles = multiRequest.getFiles("file2"); MultipartFile file = null; BufferedOutputStream bos = null; for (int i = 0; i < multipartFiles.size(); ++i) { file = multipartFiles.get(i); if (!file.isEmpty()) { // 获取上传文件的路径 String uploadFilePath = file.getOriginalFilename(); System.out.println("uploadFilePath:" + uploadFilePath); // 截取上传文件的文件名 String uploadFileName = uploadFilePath.substring(uploadFilePath.lastIndexOf('\') + 1, uploadFilePath.indexOf('.')); System.out.println("uploadFileName:" + uploadFileName); // 截取上传文件的后缀 String uploadFileSuffix = uploadFilePath.substring(uploadFilePath.indexOf('.') + 1, uploadFilePath.length()); System.out.println("uploadFileSuffix:" + uploadFileSuffix); String newPath = "E:\" + System.nanoTime() + uploadFileSuffix; try { bos=new BufferedOutputStream(new FileOutputStream(new File(newPath))); byte[]bytes=file.getBytes(); bos.write(bytes, 0, bytes.length); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }catch(Exception e){ e.printStackTrace(); } } else { System.out.println("上传的文件为空"); } System.out.println("上传文件完成了"); } return "admin/login";//这里根据自己实际情况返回路径 }
下载
@RequestMapping("/downLoad") @ResponseBody public void downLoad(HttpServletResponse res){ String fileName = "a.txt"; res.setHeader("content-type", "application/octet-stream"); res.setContentType("application/octet-stream"); res.setHeader("Content-Disposition", "attachment;filename=" + fileName); byte[] buff = new byte[1024]; BufferedInputStream bis = null; OutputStream os = null; try { os = res.getOutputStream(); bis = new BufferedInputStream(new FileInputStream(new File("f://" + fileName))); int i = bis.read(buff); while (i != -1) { os.write(buff, 0, buff.length); os.flush(); i = bis.read(buff); } } catch (IOException e) { e.printStackTrace(); } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } } System.out.println("success"); }