教学思路ASP.Net之服务器控件： 四、FileUpload

 1  //上传图片 
 2          //TextBox2为上传图片的自定义文件名. 
 3          protected  void Button2_Click( object sender, EventArgs e) 
 4         { 
 5                  if (FileUpload1.HasFile) //判读是否有文件 
 6                 { 
 7                          string filename = FileUpload1.FileName; //得到文件在本地的路径，及全路径 
 8                          string kzm = filename.Substring(filename.LastIndexOf ( ".")); //将扩展名存放到变量kzm中 
 9                          string uploadfilename = Server.MapPath( "upload") +"\\"+TextBox2.Text+kzm; //得到文件在服务器上的路径和文件名和扩展名。 
10                          if (!kzm.Equals( ".jpg")&& kzm !=  ".JPG")  //判断扩展名 
11                                 Response.Write( "<script>alert('格式不正确');</script>"); 
12                          if (File.Exists(uploadfilename))                  //判断重名 
13                                 Response.Write( "<script>alert('图片重名，请更换图片名称！');</script>"); 
14                          else 
15                         { 
16                                  try 
17                                 { 
18                                         FileUpload1.SaveAs(uploadfilename); //将文件上传到服务器上。 
19                                         Image1.ImageUrl = "upload\\" + TextBox2.Text + kzm; //图片路径为刚才上传的文件 
20                                         Image1.Height = 300; //控制图片的大小 
21                                         Image1.Width =250; 
22                                 } 
23                                  catch(Exception ex) 
24                                 { 
25                                            Response .Write ( "<script>alert('"+ex.Message.ToString ()+ "');</script>"); 
26                                 } 
27                         } 
28                 } 
29                  else 
30                 { 
31                         Response.Write( "<script>alert('你还没选择上传的图片！');</script>"); 
32             
33                 } 
34         }

< %@ Page  Language ="C#"  AutoEventWireup ="true"  CodeFile ="Upload.aspx.cs"  Inherits ="Upload" % > 

< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > 

< html  xmlns ="http://www.w3.org/1999/xhtml"  > 
< head  runat ="server" > 
         < title >Asp.net文件上传时的客户端简单验证 </title> 
         
< script  language ="javascript"  > 
function checkmes(id) 
{ 
     var filename = document.getElementById(id).value; 
     //验证是否选择文件 
     if(filename=="") 
     { 
         alert("请选择一个文件！"); 
         return false; 
     } 
        
     //验证扩展名 
     var ex = filename.substring(filename.length-4); 
     if(ex!=".xls") 
     { 
            alert("你选择的文件类型不正确，请选择一个Excel文件!"); 
            return false; 
     } 
        
     //最后提示信息 
     return confirm("你确定要上传此Excel文件？"); 
} 
</script> 

</head> 
< body > 
         < form  id ="form1"  runat ="server" > 
         < div > 
                 < strong >Asp.net文件上传时的客户端简单验证 < br  /> 
                         < br  /> 
                         < asp:FileUpload  ID ="fu_Excel"  runat ="server"  Width ="300px"  />  
                         < asp:Button  ID ="btn_Upload"  runat ="server"  Text ="上 传"  OnClick ="btn_Upload_Click"  />  </strong> </div> 
         </form> 
</body> 
</html>

using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
 
public partial  class Upload : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
     { 
                btn_Upload.Attributes.Add( "onclick",  "javascript:return checkmes('" + fu_Excel.ClientID +  "');"); 
        } 
 
         protected  void btn_Upload_Click( object sender, EventArgs e) 
    { 
                 //上传文件的服务器端代码 
        } 
}

< asp:FileUpload  ID ="FileUpload1"  runat ="server"  /> 
                                                                  < asp:RegularExpressionValidator        
id ="FileUpLoadValidator"  runat ="server"        
ErrorMessage ="上传图片只能为.jpg或.gif"        
ValidationExpression ="^([a-zA-Z]:\\)[0-9a-zA-Z\u4e00-\u9fa5\w\s\\!@#\$%^&\*\(\)_\+\-=\[\]{};'\,\.]*(.jpg|.JPG|.gif|.GIF|.bmp|.BMP)$"        

ControlToValidate ="FileUpload1" > </ asp:RegularExpressionValidator >

 1protected  void Button3_Click( object sender, EventArgs e) 
 2        { 
 3                HttpFileCollection fileuploadControls = Request.Files; 
 4                 for ( int i = 0; i < fileuploadControls.Count; i++) 
 5                { 
 6                        HttpPostedFile fileuploadcontrol = fileuploadControls[i]; 
 7                         if (fileuploadControls[i].ContentLength > 0) 
 8                        { 
 9                                 try 
10                                { 
11                                        fileuploadcontrol.SaveAs(Server.MapPath( "upload") +"\\"+Path.GetFileName( fileuploadControls[i].FileName)); 
12                                } 
13                                 catch (Exception ex) 
14                                { 
15                                        Response.Write( "<script>alert('" + ex.Message.ToString() +  "');</script>"); 
16                                } 
17                        } 
18                } 
19                Response.Write( "<script>alert('上传成功！');</script>"); 
20        }

本文转自叶子文文博客51CTO博客，原文链接http://blog.51cto.com/leafwf/185694如需转载请自行联系原作者

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