C#实现的文件上传下载工具类完整实例【上传文件自动命名】

using System;using System.IO;using System.Net;using System.Net.Http;using System.Net.Http.Headers;using JYRS.Util;namespace JYRS.Utils{  public class FileHelper  {    /// <summary>    /// 将文件名解析成文件的上传路径    /// </summary>    /// <param name="fileName">文件名</param>    /// <param name="path">文件路径</param>    /// <returns path>文件在服务器上的路径</returns>    public static String transPath(string fileName, string path)    {      createDir(path)；      //取服务器时间+8位随机码作为部分文件名，确保文件名无重复      string nowStr = DateTime.Now.ToString("yyyyMMddhhmmssff") + Global.CreateRandomCode(8);      // 去掉后缀的文件名      string fileNameStr = fileName.Substring(0, fileName.LastIndexOf("."));      // 文件后缀      String suffix = fileName.Substring(fileName.LastIndexOf(".") + 1);      if (fileName.Trim() != "")      {        // 如果名称不为"",说明该文件存在，否则说明该文件不存在        path += "//" + fileNameStr + nowStr + "." + suffix;// 定义上传路径      }      return path;    }    /// <summary>    /// 创建文件目录    /// </summary>    /// <param name="root">根目录</param>    /// <returns ></returns>    private static void createDir(String root)    {      // 检查目录      if (!Directory.Exists(System.Web.HttpContext.Current.Server.MapPath(root)))      {        Directory.CreateDirectory(System.Web.HttpContext.Current.Server.MapPath(root));      }    }    /// <summary>    /// 根据文件在服务器上的路径下载文件，此处采用的是WebAPI的方式进行文件下载，下载成功后可自定义文件的保存路径    /// </summary>    /// <param name="fileName">文件名</param>    /// <param name="path">文件路径</param>    /// <returns></returns>    public static HttpResponseMessage download(string fileName, string path)    {      try      {        var stream = new FileStream(path, FileMode.Open);        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);        response.Content = new StreamContent(stream);        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");        response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")        {          FileName = fileName        };        return response;      }      catch      {        return new HttpResponseMessage(HttpStatusCode.NoContent);      }    }  }}

[HttpGet]public HttpResponseMessage UploadAndDownload(){  //文件上传到服务器上的根目录  string root = System.Web.Hosting.HostingEnvironment.MapPath(@"~/upload");  string fileName = "测试.docx";  //解析文件在服务器上的上传路径  string path = FileHelper.transPath(fileName, root);  //获取要上传的文件  var files = HttpContext.Current.Request.Files;  HttpPostedFile file = HttpContext.Current.Request.Files[0];  //保存文件  file.SaveAs(System.Web.HttpContext.Current.Server.MapPath(path));  //下载word文件  return FileHelper.download(fileName, path);}

<a href="http://localhost:60179/api/CeshiController/UploadAndDownload" rel="external nofollow" "> 导出 </a>