springboot实现文件上传

将文件上传到指定目录，以上传的当天时间新建一个文件夹，以时间戳+UUID的方式对文件进行重命名，防止上传的文件名重复；

pom.xml

 <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.7</version>
        </dependency>

    @Value("${uploadPath}")
    private String uploadPath;

    @PostMapping("/upload")
    public void upload(MultipartFile filename) throws IOException {
        // 获取文件原始名称
        String fileName = filename.getOriginalFilename();
         //获取文件后缀
        String extension = "."+FilenameUtils.getExtension(fileName);
        //生成新的文件名称
        String newFileName= new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())+ UUID.randomUUID().toString().replace("-","")+extension;
        // 根据日期生成目录
        String format = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        String dateDirPath = uploadPath + format;
        File dateDir = new File(dateDirPath);
        if (!dateDir.exists())
            dateDir.mkdirs();
        // 处理文件上传
        filename.transferTo(new File(dateDir, newFileName));

    }