Java实现文件上传的方法总结

    @PostMapping(value = "/uploadFile")
    @apiOperation(value = "文件上传", notes = "文件上传")
    public Result uploadFile(@RequestParam (name = "file") MultipartFile file) throws Exception {
        String url = fileService.uploadFile(file);
    }

//获取文件名称
String originalFilename = file.getOriginalFilename();
// 截取上传文件的后缀
 String uploadFileSuffix = originalFilename.substring(originalFilename.indexOf('.') + 1, originalFilename.length());
 //获取文件父目录
  File Parentlocaltion=localFile.getParentFile();
//获取文件绝对目录
  File localFileAbsoluteFile=localFile.getAbsoluteFile();

String currentDir = System.getProperty("user.dir");

String folderPath = "D:\\uploadFiles\\report\\20230213\\";
File folder = new File(folderPath);
if (!folder.exists()) {
    folder.mkdirs();
}

 public String uploadFile(MultipartFile file) throws Exception {
		File file = new File(fileName);
	    try {
	        //使用此方法保存必须要绝对路径且文件夹必须已存在,否则报错
	       String fileUrl = "D:\\uploadFiles\\report\\" + fileAdd + File.separator + System.currentTimeMillis() + "." + uploadFileSuffix;
            File localFile = new File(fileUrl);
            File Parentlocaltion=localFile.getParentFile();

            if (!Parentlocaltion.exists()) { //判断文件父目录是否存在
                Parentlocaltion.mkdirs();
            }
            //FileUtils.copyInputStreamToFile(file.getInputStream(), localFile);
            file.transferTo(localFile);
	    } catch (IOException e) {
	        e.printStackTrace();
	        return dealResultMap(false, "上传失败");
	    }*/
	    return dealResultMap(true, "上传成功");
 }

 public String uploadFile(MultipartFile file) throws Exception {
    String fileName = file.getOriginalFilename();
    try {
        //获取文件字节数组
        byte [] bytes = file.getBytes();
        //文件存储路径(/fileupload1/ 这样会在根目录下创建问价夹)
        File pfile = new File("/fileupload1/");
        //判断文件夹是否存在
        if(!pfile.exists()){
            //不存在时,创建文件夹
            pfile.mkdirs();
        }
        //创建文件
        File file = new File(pfile, fileName);
        //写入指定文件夹
        OutputStream out = new FileOutputStream(file);
        out.write(bytes);
    } catch (IOException e) {
        e.printStackTrace();
        return dealResultMap(false, "上传失败");
    }
    return dealResultMap(true, "上传成功");
}