(转)html中使用表单和input file上传图片

本文转载自：http://hi.baidu.com/love_1210/item/120e452b42b2a854c38d59eb

客户端代码：

<form name="form1" method="post" enctype="multipart/form- data" action="requestfile/asprece.aspx">//如果file框没有加runat="server",则 form里一定要加上 enctype="multipart/form-data"这样才可以实现上传文件到服务器;使用了server和没有使用

runat="server"是有区别的.使用了runat="server"的form编译后，action必定是指向本身的网页。而没

有加runat="server"的form可以指向一个网页。

<input type="file" name="file1" style="width:160px;" />
<input type="submit" name="Submit" value="添加" />
</form>

服务器端代码：

private string retvalue = "ok";
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
HttpPostedFile req = Request.Files["file1"];
if (req == null || req.ContentLength < 0)
{

Response.Write("没有文件");
Response.End();
}
else
{
try
{

string extion = System.IO.Path.GetExtension(req.FileName.ToString());
string date = DateTime.Now.ToString("yyyyMMddhhmmss").ToString();
string src = date + extion;
string pathnew = Server.MapPath("~/testfile/");
req.SaveAs(pathnew+src); //自带的方式保存文件

/*读取文件流保存

Stream stream = req.InputStream;
//string src = "test.xls";
string fullpathnew = pathnew + src;

if (!Directory.Exists(pathnew))
{
Directory.CreateDirectory(pathnew);
}

BinaryReader br = new BinaryReader(stream);
byte[] fileByte = br.ReadBytes((int)stream.Length);
// string content = fileByte.ToString();
using (FileStream fileStream = new FileStream(fullpathnew, FileMode.Create))
{
fileStream.Write(fileByte, 0, fileByte.Length);
}*/

}
catch (Exception es)
{
retvalue = es.Message.ToString();

}
finally
{
Response.Write(retvalue);
}
}
}