@RestController
public class FileController {

/*** 单文件上传** @param file* @return*/
@RequestMapping("/upload")
public String upload(@RequestParam("file") MultipartFile file) {try {if (file.isEmpty()) {return "file is empty!";}String fileName = file.getOriginalFilename();String suffixName = fileName.substring(fileName.lastIndexOf("."));//设置文件存储路径String filePath = "D:\\program\\springfile";String path = filePath + File.separator + fileName;File dest = new File(path);if (!dest.getParentFile().exists()) {dest.getParentFile().mkdirs();}file.transferTo(dest);return "update success!";} catch (IOException e) {e.printStackTrace();}return "update failure!";
}/*** 多文件上传*/
@PostMapping("/batch")
public String handleFileUpdate(HttpServletRequest request) {List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");MultipartFile file = null;BufferedOutputStream stream;String filePath = "D:\\program\\springfile";for (MultipartFile multipartFile : files) {if (!multipartFile.isEmpty()) {try {byte[] bytes = file.getBytes();stream = new BufferedOutputStream(new FileOutputStream(new File(filePath + File.separator + multipartFile.getOriginalFilename())));stream.write(bytes);//写入stream.close();//关闭} catch (IOException e) {e.printStackTrace();return multipartFile.getOriginalFilename() + "上传失败！";}} else {return multipartFile.getOriginalFilename() + "上传失败！";}}return "update files success!";
}@GetMapping("/download")
public String downloadFile(HttpServletRequest request, HttpServletResponse response) throws IOException {String fileName = "aaa.txt";if (fileName != null) {String filePath = "D:\\program\\springfile";File file = new File(filePath + File.separator + fileName);if (file.exists()) {response.setContentType("application/force-download");response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);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);}} catch (IOException e) {e.printStackTrace();} finally {if (bis != null)bis.close();if (fis != null)fis.close();}return "download success!";}}return "failure";
}

}