【Spring】使用Spring的MultipartFile进行文件上传

public void upload(MultipartFile file, String uploadpath,  String id,String num) {
		try {
			// 判断目录是否存在
			File fold = new File(uploadpath + "/" + id);
			if (!fold.exists()) {
				fold.mkdirs();
			}
			//取轮播图的序列号
			
			//取文件名后缀
			String postfix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
			FileOutputStream fileOS = new FileOutputStream(uploadpath + "/" + id + "/"  + num + postfix);
			fileOS.write(file.getBytes());
			fileOS.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
}