高分求教，请问ASP.NET如何通过表单上传图片文件。
因为我的网站都是用AJAX来做的，全部都是静态页面，所以FileUpload等服务器控件用不了，只能采用表单上传的方式来上传图片文件。但是我对表单上传的原理过程不是很了解。
求详细的客户端代码和后台处理代码，谢谢！！！
因为我的网站都是用AJAX来做的，全部都是静态页面，所以FileUpload等服务器控件用不了，只能采用表单上传的方式来上传图片文件。但是我对表单上传的原理过程不是很了解。
求详细的客户端代码和后台处理代码，谢谢！！！
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>带有图片预览功能的上传表单it.com.cn</title>
<script>
function viewmypic(mypic,imgfile) {
if (imgfile.value){
mypic.src=imgfile.value;
mypic.style.display="";
mypic.border=1;
}
}
</script>
</head>
<body>
<center>
<form >
<input name="imgfile" type="file" id="imgfile" size="40" onchange="viewmypic(showimg,this.form.imgfile);" />
<br />
</form>
<img name="showimg" id="showimg" src="" style="display:none;" alt="预览图片" />
<br />
</div>
<div style="display:none">
</div>
</center>
</body>
</html> 文章来源：http://www.knowsky.com/347503.html
<html> <body> <center>
<form name="mainForm" enctype="multipart/form-data" action="process.asp" method=post> <input type=file name=mefile><br> <input type=submit name=ok value="OK"> </form>
</center>
</body>
</html> 这里面唯一要注意的是enctype="multipart/form-data"这个属性,这个属性表明我们的表单是多类型数据格式,而不是byte格式的
HttpFileCollection files = HttpContext.Current.Request.Files; for (int iFile = 0; iFile < files.Count; iFile++)
{
HttpPostedFile postedFile = files[iFile]; string fileName,newfilename, fileExtension,filepath,savefilepath;
fileName = System.IO.Path.GetFileName(postedFile.FileName);
if (fileName != "")
{
fileExtension = System.IO.Path.GetExtension(fileName);
newfilename=System.DateTime.Now.ToString("yyyyMMddhhmmssffff")+fileExtension;
filepath=System.Web.HttpContext.Current.Request.MapPath("files/") + newfilename;
savefilepath="files/"+newfilename;
postedFile.SaveAs(filepath);
insert(fileName,savefilepath,fileExtension);
}
如果你要全是html的话,那就直接全用javascript写
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileUp.aspx.cs" Inherits="FileUp" %><!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>无标题页</title>
<link href="css/css.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div>
<br />
<br />
<asp:Panel ID="Panel1" runat="server" Height="366px" Width="631px">
<div style="text-align: center">
<br />
<table border="0" style="width: 462px">
<caption>
</caption>
<tr>
<td style="width: 182px; height: 40px" align="right" >
请填写文件名称：</td>
<td style="height: 40px" align="left" >
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtName"
ErrorMessage="请填写文件名称">*</asp:RequiredFieldValidator></td>
</tr>
<tr>
<td style="width: 182px; height: 40px" align="right" >
请填写文件描述：</td>
<td style="height: 40px" align="left" >
<asp:TextBox ID="txtDescript" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtDescript"
ErrorMessage="请填写文件名称">*</asp:RequiredFieldValidator></td>
</tr>
<tr>
<td style="width: 182px; height: 40px" align="right" >
请选择文件路径：</td>
<td style="height: 40px" align="left" >
<input id="File1" runat="server" type="file" /></td>
</tr>
<tr>
<td colspan="2" align="center" style="height: 53px">
<asp:ImageButton ID="btnSubmit" runat="server" ImageUrl="~/Images/提交.gif" OnClick="btnSubmit_Click" />
<asp:ImageButton ID="btnReset" runat="server" ImageUrl="~/Images/重设.gif" CausesValidation="False" OnClick="btnReset_Click" /></td>
</tr>
</table>
</div>
<asp:ValidationSummary ID="ValidationSummary1" runat="server" ShowMessageBox="True"
ShowSummary="False" />
</asp:Panel>
</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 FileUp : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Name"] == null)
{
JS.Alert("您还未登陆或登陆超时！");
Response.Redirect("Default.aspx");
}
}
protected void btnReset_Click(object sender, ImageClickEventArgs e)
{
txtName.Text = "";
txtDescript.Text = "";
}
/// <summary>
/// 执行上传文件的判断
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnSubmit_Click(object sender, ImageClickEventArgs e)
{
if ("" != File1.PostedFile.FileName)
{
string publisher = Session["Name"].ToString();
DateTime time = DateTime.Now;
string name = txtName.Text;
string descript = txtDescript.Text;
string path = File1.PostedFile.FileName;
string filetype = path.Substring(path.LastIndexOf(".") + 1);
string filename = name+DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + "." + filetype;
if ((filetype == "rar")||(filetype == "exe")||(filetype == "doc")||(filetype == "xls")||(filetype == "ppt"))
{
try
{
string size = (File1.PostedFile.ContentLength/1024).ToString()+"KB";
File1.PostedFile.SaveAs(Server.MapPath("~/upFiles") + "\\" + filename);
if (Resource.InsertResourceInfo(filename, descript, publisher, time,size, filetype))
{
JS.Alert("文件上传成功！");
}
}
catch (Exception e3)
{
Response.Write(e3);
JS.Alert("对不起，您上传的文件过大！");
}
}
else
{
JS.Alert("请上传格式为rar,exe,doc,xls,ppt的附件！");
return;
}
}
else
{
JS.Alert("请选择文件路径！");
}
}
}
<%@ language="javascript" %><html>
<head>
<title>上传图片文件</title>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">
</head>
<body>
<%//保存路径
var spath = "images/";var self = Request.ServerVariables("SCRIPT_NAME");
if ((Request.ServerVariables("REQUEST_METHOD") + "").toLowerCase()=="post")
{
var fmLen = Request.TotalBytes;
var fmCont = Request.BinaryRead(fmLen);
var ext = getExt(fmCont);
var msg = "Not Allow Extension Of " + ext + " , Upload Fail !"; if (/\.(rar|bmp|jpg|gif)/i.test(ext))
{
var stm = Server.CreateObject("ADODB.Stream");
stm.Type = 1;
stm.Mode = 3;
stm.Open;
stm.Write(fmCont);
var s = stm.Position = getStart(fmCont);
var bstr = stm.Read(fmLen - s - 47);
var fileName = new Date().valueOf() + ext;
stm.Close();
stm.Open();
stm.Write(bstr);
stm.SaveToFile(Server.MapPath(spath + fileName));
stm.Close();
stm = null;
msg = "Upload File Succeed !";
} Response.Write("\
<script type=\"text/javascript\">\
window.alert(\""+msg+"\");\
window.opener.sform.content.value += \"\\r\\n<img src=\\\"/Myart/images/" + fileName + "\\\">\";\
window.close();\
location.replace(\"" + self + "\");\
</script>");
}
function getExt(bstr)
{
var stm = Server.CreateObject("ADODB.Stream");
stm.Type = 2;
stm.Mode = 3;
stm.Open();
stm.WriteText(bstr);
stm.Position = 0;
stm.CharSet = "GB2312";
var fmText = stm.ReadText();
stm.Close();
stm = null;
return /filename=\".+(\..+)\"/.exec(fmText)[1];
}
%>
<script language="vbscript" runAt="server">
function getStart(bstr) : getStart = InStrB(1, bstr, ChrB(13) & ChrB(10) & ChrB(13) & ChrB(10)) + 3 : end function
</script><form action="<%= self %>" method="post" enctype="multipart/form-data" onsubmit="return (this.upFile.value!='');">
<input type="file" name="upFile" />
<input type="submit" value="上传文件" />
</form></body>
</html>