Image 上传下载Api

1.配置

  "UploadConfig": {
    // 自定义存放位置，无需放到站点内部
    "Path": "C:\\Users\\kxy\\Desktop\\images\\Upload",
    // 配置id对应的子目录
    "Items": [
      {
        "id": "CeshiImg",
        "path": "CeshiImg"
      }
    ]
  }

　　定义类，用来接住配置

    public class UploadConfig
    {
        public string Path { get; set; }
        public List<Item> Items { get; set; }
    }
    public class Item
    {
        public string id { get; set; }
        public string path { get; set; }
    }

　　读取配置，需要在 Startup 的 ConfigureServices 添加

            services.AddOptions();
            services.Configure<UploadConfig>(Configuration.GetSection("UploadConfig"));

2.接口

    [Route("api/[controller]")]
    [ApiController]
    public class UploadController : ControllerBase
    {
        UploadConfig configs = null;
        public UploadController(IOptions<UploadConfig> option)//构造函数
        {
            configs = option.Value;
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="id">子目录id</param>
        /// <param name="files">文件</param>
        /// <returns></returns>
        [HttpPost("{id}")]
        public async Task<IActionResult> File(string id, [FromForm]List<IFormFile> files)
        {
            if (!SuccessConfig(id))
                return Ok(new { Msg = "配置信息不存在" });
            var con = configs.Items.Find(p => p.id == id);
            // 保存文件夹
            var saveFolder = Path.Combine(configs.Path, con.path);
            if (!Directory.Exists(saveFolder))
                Directory.CreateDirectory(saveFolder);
            var LPath = new List<string>();
            try
            {
                foreach (var file in files)
                {
                    // 相对路径
                    var relaPath = Path.Combine(con.path, RanFileNo(id) + "." + GetFileSuf(file.FileName));
                    using (var stream = new FileStream(Path.Combine(configs.Path, relaPath), FileMode.Create))
                    {
                        await file.CopyToAsync(stream);
                    }
                    LPath.Add(relaPath);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return Ok(new { count = files.Count, LPath });
        }

        /// <summary>
        /// 获取文件流
        /// </summary>
        /// <param name="relaPath">相对路径</param>
        /// <returns></returns>
        [HttpGet("Get")]
        public async Task<IActionResult> Get([FromQuery]string relaPath)
        {
            var image = System.IO.File.OpenRead(Path.Combine(configs.Path,relaPath));
            return File(image, "image/jpeg");
        }

        /// <summary>
        /// 检查配置
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        private bool SuccessConfig(string id)
        {
            if (configs == null || configs.Path == "" || configs.Path == null || configs.Items == null)
                return false;
            var con = configs.Items.Find(p => p.id == id);
            if (con == null || con.path == "" || con.path == "")
                return false;
            return true;
        }

        /// <summary>
        /// 获取随机路径
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        private string RanFileNo(string id)
        {
            return id + "_" + DateTime.Now.ToString("yyyyMMddHHmmss") + "_" + (new Random(Guid.NewGuid().GetHashCode())).Next(, ).ToString();
        }

        /// <summary>
        /// 获取文件后缀
        /// </summary>
        /// <param name="filename"></param>
        /// <returns></returns>
        private string GetFileSuf(string filename)
        {
            var le = filename.Split('.').Length;
            if (le == )
                throw new Exception("获取文件名后缀失败");
            return filename.Split('.')[le - ];
        }
    }

3.Postman 调用接口

　　1）上传

　　2）获取