HTML <input type="file">上传文件——结合asp.net的一个文件上传示例

HTML的代码:(关键是要在form里设置enctype="multipart/form-data",这样才能在提交表单时,将文件以二进制流的形式传输到服务器)

一、

<form id="form1" action="test.aspx" method="post" enctype="multipart/form-data">
    <div>
        <input type="file" name="fl" />
        <input type="submit" name="sb" value="submit" />
    </div>
    </form>

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            for (int i = ; i < Request.Files.Count; i++)
            {
                HttpPostedFile PostedFile = Request.Files[i];
                if (PostedFile.ContentLength > )
                {
                    string FileName = PostedFile.FileName;//此处文件名可能上传的是 客户端完成路径 C:\\123.png
                    string strExPrentFile = FileName.Substring(FileName.LastIndexOf(".") + );

                    string sFilePath = Server.MapPath("~/") + FileName;// Server.MapPath("~/123." + strExPrentFile);
                    PostedFile.SaveAs(sFilePath);
                }
                else
                {
                    //this.LabMessage.Text = "不能上传空文件";
                }
            }
            Response.Write("");
        }
    }
}

浏览器中查看信息--

响应头信息   原始头信息
Cache-Control    
private
Connection    
Close
Content-Length    
458
Content-Type    
text/html; charset=utf-8
Date    
Thu, 28 May 2015 03:06:47 GMT
Server    
ASP.NET Development Server/10.0.0.0
X-AspNet-Version    
4.0.30319
请求头信息   原始头信息
Accept    
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding    
gzip, deflate
Accept-Language    
zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Connection    
keep-alive
Cookie    
oa_cookiename=%e8%82%96%e5%b7%a5; oa_cookieId=291; 肖工_log=operation=&TlogGUI=ed1624e4-9e1d-44fb-98f7-1298512a8266
; ASP.NET_SessionId=cfufw4sesznnphj4peooed0d; SLnewses=1; WPTLNG=1
Host    
localhost:13771
Referer    
http://localhost:13771/AppWeb/test.aspx
User-Agent    
Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Firefox/38.0

来自上传流的请求头信息  
Content-Length    
430
Content-Type    
multipart/form-data; boundary=---------------------------18319207917180

POST
部分multipart/form-data
fl    
‰PNG

���
IHDR���������
���bKGD�ÿ�ÿ�ÿ ½§“���    pHYs��Ä��ĕ+���'IDAT™Á    � °>ó/I6º’ðž×,·¢¬’eEòàXŒòmY����IEND®B
`‚
sb    
submit
源代码
-----------------------------18319207917180
Content-Disposition: form-data; name="fl"; filename="QQ20150528110621.png"
Content-Type: image/png

‰PNG

���
IHDR���������
���bKGD�ÿ�ÿ�ÿ ½§“���    pHYs��Ä��ĕ+���'IDAT™Á    � °>ó/I6º’ðž×,·¢¬’eEòàXŒòmY����IEND®B
`‚
-----------------------------18319207917180
Content-Disposition: form-data; name="sb"

submit
-----------------------------18319207917180--

二、

<form id="form1" runat="server"  method="post" enctype="multipart/form-data">
    <div>
    <input type="file" />
     <asp:Button ID="btnUpload" runat="server"  Text="开始上传" onclick="btnUpload_Click" />
    </div>
    </form>

protected void btnUpload_Click(object sender, EventArgs e)
        {
            //int intCount = RequestClass.GetFormInt("hdcount", -1);
            HttpFileCollection Files = HttpContext.Current.Request.Files;
            for (int i = ; i < Files.Count; i++)
            {
                HttpPostedFile PostedFile = Files[i];
                if (PostedFile.ContentLength > )
                {
                    string FileName = PostedFile.FileName;
                    string strExPrentFile = FileName.Substring(FileName.LastIndexOf(".") + );

                    string sFilePath = "/uploadfile/hotel/" + StringClass.makeFileName24() + i + strExPrentFile;
                    PostedFile.SaveAs(Server.MapPath(sFilePath));
                }
                else
                {
                    //this.LabMessage.Text = "不能上传空文件";
                }
            }
        }