小编之前也介绍了许多ASP.NET文件上传的解决案例,今天来个asp.net文件上传大集合。
1 使用标准HTML来进行图片上传
前台代码:
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< body > < form id = "form1" runat = "server" > < div > < table > < tr > < td colspan = "2" style = "height: 21px" > 使用标准HTML来进行图片上传</ td > </ tr > < tr > < td style = "width: 400px" > < input id = "InputFile" style = "width: 399px" type = "file" runat = "server" /></ td > < td style = "width: 80px" > < asp:Button ID = "UploadButton" runat = "server" Text = "上传图片" OnClick = "UploadButton_Click" /></ td > </ tr > < tr > < td colspan = "2" > < asp:Label ID = "Lb_Info" runat = "server" ForeColor = "Red" ></ asp:Label ></ td > </ tr > </ table > </ div > </ form > </ body > |
后台代码:
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using System; using System.Data; using System.Configuration; 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 _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void UploadButton_Click(object sender, EventArgs e) { string uploadName = InputFile.Value;//获取待上传图片的完整路径,包括文件名 //string uploadName = InputFile.PostedFile.FileName; string pictureName = "";//上传后的图片名,以当前时间为文件名,确保文件名没有重复 if (InputFile.Value != "") { int idx = uploadName.LastIndexOf("."); string suffix = uploadName.Substring(idx);//获得上传的图片的后缀名 pictureName = DateTime.Now.Ticks.ToString() + suffix; } try { if (uploadName != "") { string path = Server.MapPath("~/images/"); InputFile.PostedFile.SaveAs(path + pictureName); } } catch (Exception ex) { Response.Write(ex); } } } |
2 单文件上传
这是最基本的文件上传,在asp.net1.x中没有这个FileUpload控件,只有html的上传控件,那时候要把html控件转化为服务器控件, 很不好用。其实所有文件上传的美丽效果都是从这个FileUpload控件衍生,第一个例子虽然简单却是根本。
前台代码:
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< body > < form id = "form1" runat = "server" > < div > < table style = "width: 90%" > < tr > < td style = "width: 159px" colspan = 2 > < strong >< span style = "font-size: 10pt" >最简单的单文件上传</ span ></ strong ></ td > </ tr > < tr > < td style = "width: 600px" > < asp:FileUpload ID = "FileUpload1" runat = "server" Width = "600px" /></ td > < td align = left > < asp:Button ID = "FileUpload_Button" runat = "server" Text = "上传图片" OnClick = "FileUpload_Button_Click" /></ td > </ tr > < tr > < td colspan = 2 > < asp:Label ID = "Upload_info" runat = "server" ForeColor = "Red" Width = "767px" ></ asp:Label ></ td > </ tr > </ table > </ div > </ form > </ body > |
后台代码:
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using System; using System.Data; using System.Configuration; 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 _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void FileUpload_Button_Click(object sender, EventArgs e) { try { if (FileUpload1.PostedFile.FileName == "") //if (FileUpload1.FileName == "") //if (!FileUpload1.HasFile) //获取一个值,该值指示 System.Web.UI.WebControls.FileUpload 控件是否包含文件。包含文件,则为 true;否则为 false。 { this.Upload_info.Text = "请选择上传文件!"; } else { string filepath = FileUpload1.PostedFile.FileName; //得到的是文件的完整路径,包括文件名,如:C:\Documents and Settings\Administrator\My Documents\My Pictures\20022775_m.jpg //string filepath = FileUpload1.FileName; //得到上传的文件名20022775_m.jpg string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);//20022775_m.jpg string serverpath = Server.MapPath("~/images/") + filename;//取得文件在服务器上保存的位置C:\Inetpub\wwwroot\WebSite1\images\20022775_m.jpg FileUpload1.PostedFile.SaveAs(serverpath);//将上传的文件另存为 this.Upload_info.Text = "上传成功!"; } } catch (Exception ex) { this.Upload_info.Text = "上传发生错误!原因是:" + ex.ToString(); } } } |
3、多文件上传
前台代码:
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< body > < form id = "form1" runat = "server" > < div > < table style = "width: 343px" > < tr > < td style = "width: 100px" > 多文件上传</ td > < td style = "width: 100px" > </ td > </ tr > < tr > < td style = "width: 100px" > < asp:FileUpload ID = "FileUpload1" runat = "server" Width = "475px" /> </ td > < td style = "width: 100px" > </ td > </ tr > < tr > < td style = "width: 100px" > < asp:FileUpload ID = "FileUpload2" runat = "server" Width = "475px" /></ td > < td style = "width: 100px" > </ td > </ tr > < tr > < td style = "width: 100px" > < asp:FileUpload ID = "FileUpload3" runat = "server" Width = "475px" /></ td > < td style = "width: 100px" > </ td > </ tr > < tr > < td style = "width: 100px" > < asp:Button ID = "bt_upload" runat = "server" OnClick = "bt_upload_Click" Text = "一起上传" /> < asp:Label ID = "lb_info" runat = "server" ForeColor = "Red" Width = "448px" ></ asp:Label ></ td > < td style = "width: 100px" > </ td > </ tr > </ table > </ div > </ form > </ body > |
后台代码:
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using System; using System.Data; using System.Configuration; 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 _Default : System.Web.UI.Page { protected void Page_Load( object sender, EventArgs e) { } protected void bt_upload_Click( object sender, EventArgs e) { if (FileUpload1.PostedFile.FileName == "" && FileUpload2.PostedFile.FileName == "" && FileUpload3.PostedFile.FileName == "" ) { this .lb_info.Text = "请选择文件!" ; } else { HttpFileCollection myfiles = Request.Files; for ( int i = 0; i < myfiles.Count; i++) { HttpPostedFile mypost = myfiles[i]; try { if (mypost.ContentLength > 0) { string filepath = mypost.FileName; //C:\Documents and Settings\Administrator\My Documents\My Pictures\20022775_m.jpg string filename = filepath.Substring(filepath.LastIndexOf( "\\" ) + 1); //20022775_m.jpg string serverpath = Server.MapPath( "~/images/" ) + filename; //C:\Inetpub\wwwroot\WebSite2\images\20022775_m.jpg mypost.SaveAs(serverpath); this .lb_info.Text = "上传成功!" ; } } catch (Exception ex) { this .lb_info.Text = "上传发生错误!原因:" + ex.Message.ToString(); } } } } } |
4、客户端检查上传文件类型(以上传图片为例)
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!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 >客户端检查上传文件类型</ title > < script language = "javascript" > function Check_FileType() { var str=document.getElementById("FileUpload1").value; var pos=str.lastIndexOf("."); var lastname=str.substring(pos,str.length); if(lastname.toLowerCase()!=".jpg"&&lastname.toLowerCase()!=".gif") { alert("您上传的文件类型为"+lastname+",图片必须为.jpg,.gif类型"); return false; } else { return true; } } </ script > </ head > < body > < form id = "form1" runat = "server" > < div > < table > < tr > < td colspan = "2" > 客户端检查上传文件类型</ td > </ tr > < tr > < td style = "width: 444px" > < asp:FileUpload ID = "FileUpload1" runat = "server" Width = "432px" /></ td > < td style = "width: 80px" > < asp:Button ID = "bt_upload" runat = "server" Text = "上传图片" OnClick = "bt_upload_Click" OnClientClick = "return Check_FileType()" /></ td > </ tr > < tr > < td colspan = "2" style = "height: 21px" > < asp:Label ID = "lb_info" runat = "server" ForeColor = "Red" Width = "515px" ></ asp:Label ></ td > </ tr > </ table > </ div > </ form > </ body > </ html > |
注意:点击上传时先触发客户端事件OnClientClick="return Check_FileType()"
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using System; using System.Data; using System.Configuration; 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 _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void bt_upload_Click(object sender, EventArgs e) { try { if (FileUpload1.PostedFile.FileName == "") { this.lb_info.Text = "请选择文件!"; } else { string filepath = FileUpload1.PostedFile.FileName; //if (!IsAllowedExtension(FileUpload1)) //{ // this.lb_info.Text = "上传文件格式不正确!"; //} if (IsAllowedExtension(FileUpload1) == true) { string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1); string serverpath = Server.MapPath("~/images/") + filename; FileUpload1.PostedFile.SaveAs(serverpath); this.lb_info.Text = "上传成功!"; } else { this.lb_info.Text = "请上传图片!"; } } } catch (Exception ex) { this.lb_info.Text = "上传发生错误!原因:" + ex.ToString(); } } private static bool IsAllowedExtension(FileUpload upfile) { string strOldFilePath = ""; string strExtension=""; string[] arrExtension ={ ".gif", ".jpg", ".bmp", ".png" }; if (upfile.PostedFile.FileName != string.Empty) { strOldFilePath = upfile.PostedFile.FileName;//获得文件的完整路径名 strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));//获得文件的扩展名,如:.jpg for (int i = 0; i < arrExtension.Length; i++) { if (strExtension.Equals(arrExtension[i])) { return true; } } } return false; } } |
注意:若去掉客户端的脚本和客户端事件OnClientClick="return Check_FileType()",在后台代码
改为:
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if (!IsAllowedExtension(FileUpload1)) { this.lb_info.Text = "上传文件格式不正确!"; } |
else if (IsAllowedExtension(FileUpload1) == true)
即变成服务器端检查上传文件类型。
5、服务器端检查上传文件的类型(文件内部真正的格式)
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< body > < form id = "form1" runat = "server" > < div > < table > < tr > < td colspan = "2" > 服务器检查上传文件类型</ td > </ tr > < tr > < td style = "width: 444px" > < asp:FileUpload ID = "FileUpload1" runat = "server" Width = "432px" /></ td > < td style = "width: 80px" > < asp:Button ID = "bt_upload" runat = "server" Text = "上传图片" OnClick = "bt_upload_Click" /></ td > </ tr > < tr > < td colspan = "2" style = "height: 21px" > < asp:Label ID = "lb_info" runat = "server" ForeColor = "Red" Width = "515px" ></ asp:Label ></ td > </ tr > </ table > </ div > </ form > </ body > |
后台代码:
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using System; using System.Data; using System.Configuration; 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; using System.IO; public partial class _Default : System.Web.UI.Page { protected void Page_Load( object sender, EventArgs e) { } protected void bt_upload_Click( object sender, EventArgs e) { try { if (FileUpload1.PostedFile.FileName == "" ) { this .lb_info.Text = "请选择文件!" ; } else { string filepath = FileUpload1.PostedFile.FileName; if (IsAllowedExtension(FileUpload1) == true ) { string filename = filepath.Substring(filepath.LastIndexOf( "\\" ) + 1); string serverpath = Server.MapPath( "images/" ) + filename; FileUpload1.PostedFile.SaveAs(serverpath); this .lb_info.Text = "上传成功!" ; } else { this .lb_info.Text = "请上传图片" ; } } } catch (Exception error) { this .lb_info.Text = "上传发生错误!原因:" + error.ToString(); } } private static bool IsAllowedExtension(FileUpload upfile) { FileStream fs = new FileStream(upfile.PostedFile.FileName, FileMode.Open, FileAccess.Read); BinaryReader r = new BinaryReader(fs); string fileclass = "" ; byte buffer; try { buffer = r.ReadByte(); fileclass = buffer.ToString(); buffer = r.ReadByte(); fileclass += buffer.ToString(); } catch { } r.Close(); fs.Close(); if (fileclass == "255216" || fileclass == "7173" ||fileclass== "6677" ||fileclass== "13780" ) //说明255216是jpg;7173是gif;6677是BMP,13780是PNG;7790是exe,8297是rar { return true ; } else { return false ; } } } |