jquery插件ajaxupload实现文件上传操作_jquery

<%@ WebHandler Language="C#" Class="UploadHandler" %> 
 
using System; 
using System.Web; 
using System.Text.RegularExpressions; 
using System.IO; 
 
public class UploadHandler : IHttpHandler { 
  private string _filedir = "";  //文件目录 
  /// 
 
  /// 处理上传文件(1:文件格式不正确、2:文件大小不正确、3:上传失败、文件名称:上传成功) 
  /// 
 
  ///  
  public void ProcessRequest (HttpContext context) { 
    _filedir = context.Server.MapPath(@"/file/temp/"); 
    try 
    { 
      string result = "3"; 
      string fileType = context.Request.QueryString["fileType"]; //获取上传文件类型 
      if (fileType == "file") 
      { 
        result = UploadFile(context); //文档上传 
      } 
      else if (fileType == "img") 
      { 
        result = UploadImg(context);  //图片上传 
      } 
      context.Response.Write(result); 
    } 
    catch 
    { 
      context.Response.Write("3");//3文件上传失败 
    } 
  } 
   
  /// 
 
  /// 文档上传 
  /// 
 
  ///  
  ///  
  private string UploadFile(HttpContext context) 
  { 
    int cout = context.Request.Files.Count; 
    if (cout > 0) 
    { 
      HttpPostedFile hpf = context.Request.Files[0]; 
      if (hpf != null) 
      { 
        string fileExt = Path.GetExtension(hpf.FileName).ToLower(); 
        //只能上传文件，过滤不可上传的文件类型  
        string fileFilt = ".rar|.zip|.pdf|.pdfx|.txt|.csv|.xls|.xlsx|.doc|.docx......"; 
        if (fileFilt.IndexOf(fileExt) <= -1) 
        { 
          return "1"; 
        } 
         
        //判断文件大小  
        int length = hpf.ContentLength; 
        if (length > 2097152) 
        { 
          return "2"; 
        }  
         
        Random rd = new Random(); 
        DateTime nowTime = DateTime.Now; 
        string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName); 
        if (!Directory.Exists(_filedir)) 
        { 
          Directory.CreateDirectory(_filedir); 
        } 
        string fileName = _filedir + newFileName; 
        hpf.SaveAs(fileName); 
        return newFileName; 
      } 
 
    } 
    return "3"; 
  } 
 
  /// 
 
  /// 图片上传 
  /// 
 
  ///  
  ///  
  private string UploadImg(HttpContext context) 
  { 
    int cout = context.Request.Files.Count; 
    if (cout > 0) 
    { 
      HttpPostedFile hpf = context.Request.Files[0]; 
      if (hpf != null) 
      { 
        string fileExt = Path.GetExtension(hpf.FileName).ToLower(); 
        //只能上传文件，过滤不可上传的文件类型  
        string fileFilt = ".gif|.jpg|.php|.jsp|.jpeg|.png|......"; 
        if (fileFilt.IndexOf(fileExt) <= -1) 
        { 
          return "1"; 
        } 
         
        //判断文件大小  
        int length = hpf.ContentLength; 
        if (length > 204800) 
        { 
          return "2"; 
        } 
         
        Random rd = new Random(); 
        DateTime nowTime = DateTime.Now; 
        string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName); 
        if (!Directory.Exists(_filedir)) 
        { 
          Directory.CreateDirectory(_filedir); 
        } 
        string fileName = _filedir + newFileName; 
        hpf.SaveAs(fileName); 
        return newFileName; 
      } 
 
    } 
    return "3"; 
  } 
   
  #region IHttpHandler 成员 
 
  public bool IsReusable 
  { 
    get { throw new NotImplementedException(); } 
  } 
 
  #endregion 
} 

/*上传文件*/ 
.uploadFile{margin-bottom:10px;} 
/*上传图片*/ 
.uploadImg{} 
.uploadImg img{width:102px; height:64px; border:1px solid #CCCCCC; display: block;}