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Asp.Net:上传文件
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内容图文
Asp.Net中很方便就能做个上传，例如做一个图片的上传：
<
asp:FileUpload
ID
="picUpload"
runat
="server"
/>
<
asp:Button
ID
="btnUpload"
runat
="server"
Text
="上传"
CssClass
="btn"
onclick
="btnUpload_Click"
CausesValidation
="false"
/>
对应的上传代码如下：
protected
void btnUpload_Click(object sender, EventArgs e)
{
if (!picUpload.HasFile)
{
picAssetItem.ImageUrl = "";
labUpload.Text = "请选择要上传的图片";
return;
}
string fileExtension = Path.GetExtension(picUpload.FileName).ToLower();
Match match = Regex.Match(fileExtension, "jpg|jpeg|png");
if (!match.Success)
{
picAssetItem.ImageUrl = "";
labUpload.Text = "请上传jpg或者png格式的图片";
return;
}
if (picUpload.PostedFile.ContentLength > 8192000)
{
picAssetItem.ImageUrl = "";
labUpload.Text = "文件大小超出8M！请重新选择！";
return;
}
string uploadPath = ConfigurationManager.AppSettings["UploadPath"];
uploadPath += DateTime.Today.ToString("yyyy-MM-dd");
if (!Directory.Exists(Server.MapPath(uploadPath)))
{
log.Info("Creating folder " + uploadPath + " on server");
try
{
Directory.CreateDirectory(Server.MapPath(uploadPath));
}
catch (Exception ex)
{
log.Error("Failed to create folder");
log.Error(ex);
labUpload.Text = "系统错误，上传失败";
return;
}
}
string imageUUID = System.Guid.NewGuid().ToString();
string imageName = imageUUID + fileExtension;
string imagePath = Server.MapPath(uploadPath + "/" + imageName);
string thumbImagePath = Server.MapPath(uploadPath + "/thumb-" + imageName);
try
{
picUpload.PostedFile.SaveAs(imagePath);
System.Drawing.Image image = System.Drawing.Image.FromStream(picUpload.PostedFile.InputStream, true);
System.Drawing.Size newSize = new System.Drawing.Size(400, 300);
System.Drawing.Image bitmap = new System.Drawing.Bitmap(newSize.Width, newSize.Height);
System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(bitmap);
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
graphics.Clear(System.Drawing.Color.White);
graphics.DrawImage(image,
new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height),
new System.Drawing.Rectangle(0, 0, image.Width, image.Height),
System.Drawing.GraphicsUnit.Pixel);
bitmap.Save(thumbImagePath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (Exception ex)
{
log.Error("Failed to save image");
log.Error(ex);
labUpload.Text = "系统错误，上传失败";
return;
}
txtImagePath.Text = DateTime.Today.ToString("yyyy-MM-dd") +"/" + imageName;
picAssetItem.ImageUrl = uploadPath + "/thumb-" + imageUUID + ".jpg";
labUpload.Text = "上传成功";
}
上面的代码是把图片存到本地的文件夹中，按日期进行存储，存储的文件用uuid进行命名。同时生成一张固定大小的缩略图，用来显示用。
上传小文件，还是蛮方便的，不过需要注意的是，对服务器的文件夹，必须对NETWORK组添加读写的权限：
另外，貌似只能上传小于4M 的文件，稍大的文件上传会直接无法显示网页。这个也是可以设置的，具体不想深究，能用就行：
<
system.web
>
...
<!--
加入下面设置
-->
<
httpRuntime
executionTimeout
="90"
maxRequestLength
="40960"
useFullyQualifiedRedirectUrl
="false"
minFreeThreads
="8"
minLocalRequestFreeThreads
="4"
appRequestQueueLimit
="100"
/>
</
system.web
>
原文：http://www.cnblogs.com/jpeg/p/upload-files-in-asp.html
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