C#简单实现文件上传功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Web.Security;

namespace AL.Web {
 /// <summary>
 /// Upload 的摘要说明
 /// </summary>
 public class Upload : IHttpHandler {

  public void ProcessRequest(HttpContext context) {
   context.Response.ContentType = "text/plain";
   //context.Response.Write("Hello World");

   string r = "";
   //此处有时候穿过来的sn后面还有一些乱七八糟的字符，没研究什么意思，就判断一下，截取一下就完事了，小项目~
   string sn = context.Request.QueryString["sn"];
   if (sn != null && sn.Length > 14) sn = sn.Substring(0, 14);

   if (context.User.Identity.IsAuthenticated == false) {
    // 未登录用户    
   }
   try {
    //获取上传的文件数据
    HttpPostedFile file = context.Request.Files["Filedata"];
    string fileName = file.FileName;
    string fileType = Path.GetExtension(fileName).ToLower();
    //由于不同浏览器取出的FileName不同（有的是文件绝对路径，有的是只有文件名），故要进行处理
    if (fileName.IndexOf(' ') > -1) {
     fileName = fileName.Substring(fileName.LastIndexOf(' ') + 1);
    } else if (fileName.IndexOf('/') > -1) {
     fileName = fileName.Substring(fileName.LastIndexOf('/') + 1);
    }
    //上传的目录
    string uploadDir = "~/Content/uploadfile/TMP/" + System.DateTime.Now.ToString("yyyyMM") + "/";
    //上传的路径
    //生成年月文件夹及日文件夹
    if (Directory.Exists(context.Server.MapPath(uploadDir)) == false) {
     Directory.CreateDirectory(context.Server.MapPath(uploadDir));
    }
    if (Directory.Exists(context.Server.MapPath(uploadDir + System.DateTime.Now.ToString("dd") + "/")) == false) {
     Directory.CreateDirectory(context.Server.MapPath(uploadDir + System.DateTime.Now.ToString("dd") + "/"));
    }

    uploadDir = uploadDir + System.DateTime.Now.ToString("dd") + "/";

    string uploadPath = uploadDir + FormsAuthentication.HashPasswordForStoringInConfigFile(fileName, "MD5").Substring(0, 8) + fileType;
    //保存文件
    file.SaveAs(context.Server.MapPath(uploadPath));
    //下面这句代码缺少的话，上传成功后上传队列的显示不会自动消失
    //DbHelperOleDb.ExecuteSql("insert into [temp](temp_sn,temp_Content) values('" + sn + "','" + uploadPath + "')");

    //Response.Write("1");
    //context.Response.Write("{'IsError':false, 'Data':'" + uploadPath + "'}");
    r = "{'IsError':false, 'Data':'" + uploadPath + "'}";
   } catch (Exception ex) {
    //Response.Write("0");
    //throw ex;
    //context.Response.Write("{IsError: true, data:'" + ex.Message + "'}");
    r = "{'IsError':true, 'Data':'" + ex.Message + "'}";
   } finally {
    r = r.Replace("'", "\"");
    context.Response.Write(r);
    context.Response.End();
   }
  }
  public bool IsReusable {
   get {
    return false;
   }
  }
 }
}