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<form method="POST" enctype="multipart/form-data" action="UploadImg.ashx">

<table>

<tr>

<td>func：</td>

<td><input type="text" name="func"/></td>

</tr>

<tr>

<td>用户Id：</td>

<td><input type="text" name="userId"/></td>

</tr>

<tr>

<td>头像：</td>

<td><input type="file" name="icon"/></td>

</tr>

<tr>

<td>水印：</td>

<td><input type="text" name="waterMark"/></td>

</tr>

</table>

<input type="submit" value="提交"/>

</form>

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private string UploadImage(HttpContext context)

{

try

{

System.IO.Stream stream = context.Request.Files["icon"].InputStream;

//返回的图片路径可以存储在数据库中

string imageUrl = SaveImage(stream, "Icon", "蝈蝈");

string thumbnailImageUrl = SaveThumbnailImage(stream, "Icon");

string thumbnailImageUrlWithWatermark = SaveThumbnailImage(ConfigurationManager.AppSettings["AttachmentsDirectory"] + imageUrl, "Icon");

return "上传成功！";

}

catch (Exception ex)

{

return "上传失败！";

}

}

private string SaveImage(Stream stream, string folderName, string waterMark)

{

try

{

string fileName = Guid.NewGuid() + ".jpg";

string path = ConfigurationManager.AppSettings["AttachmentsDirectory"];

path = Path.Combine(path, folderName + "\\" + DateTime.Now.Year + "\\" + DateTime.Now.Month + "\\" + DateTime.Now.Day + "\\");

string imageUrl = "/" + folderName + "/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/";

if (!string.IsNullOrEmpty(waterMark))

{

Image imgSource = Image.FromStream(stream);

AddWatermarkAndSave(path, fileName, waterMark, imgSource, imgSource.Height - 300, 10, Color.Red,

new Font("宋体", 40));

}

else

{

byte[] buffer = new byte[stream.Length];

stream.Read(buffer, 0, buffer.Length);

if (!Directory.Exists(path))

{

Directory.CreateDirectory(path);

}

System.IO.FileStream fs = new System.IO.FileStream(path + fileName, System.IO.FileMode.OpenOrCreate,

System.IO.FileAccess.Write);

fs.Write(buffer, 0, buffer.Length);

fs.Flush();

fs.Close();

}

return imageUrl + fileName;

}

catch (Exception ex)

{

return "";

}

}

private string SaveThumbnailImage(Stream stream, string folderName)

{

try

{

string fileName = Guid.NewGuid() + ".jpg";

string path = ConfigurationManager.AppSettings["AttachmentsDirectory"];

path = Path.Combine(path, folderName + "\\" + DateTime.Now.Year + "\\" + DateTime.Now.Month + "\\" + DateTime.Now.Day + "\\");

string imageUrl = "/" + folderName + "/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/";

System.Drawing.Image.GetThumbnailImageAbort myCallback = new System.Drawing.Image.GetThumbnailImageAbort(GetFalse);

//数据源来自Stream

Image image = System.Drawing.Bitmap.FromStream(stream);

System.Drawing.Image thumbnailImage = image.GetThumbnailImage(64, 64, myCallback, IntPtr.Zero);

thumbnailImage.Save(path + fileName);

thumbnailImage.Dispose();

return imageUrl + fileName;

}

catch (Exception ex)

{

return "";

}

}

private string SaveThumbnailImage(string originalFileName, string folderName)

{

try

{

string fileName = Guid.NewGuid() + ".jpg";

string path = ConfigurationManager.AppSettings["AttachmentsDirectory"];

path = Path.Combine(path, folderName + "\\" + DateTime.Now.Year + "\\" + DateTime.Now.Month + "\\" + DateTime.Now.Day + "\\");

string imageUrl = "/" + folderName + "/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/";

System.Drawing.Image.GetThumbnailImageAbort myCallback = new System.Drawing.Image.GetThumbnailImageAbort(GetFalse);

//数据源来自File

Image image = System.Drawing.Bitmap.FromFile(originalFileName);

System.Drawing.Image thumbnailImage = image.GetThumbnailImage(64, 64, myCallback, IntPtr.Zero);

thumbnailImage.Save(path + fileName);

thumbnailImage.Dispose();

return imageUrl + fileName;

}

catch (Exception ex)

{

return "";

}

}

private bool GetFalse()

{

return false;

}

/// <summary>

/// 图片加文字水印

/// </summary>

/// <param name="fileName"> </param>

/// <param name="text">水印文字，如果是多行用分号隔开</param>

/// <param name="img">图片</param>

/// <param name="paddingTop">上边距</param>

/// <param name="paddingLeft">左边距</param>

/// <param name="textColor">文字颜色</param>

/// <param name="textFont">字体</param>

/// <param name="path">保存地址</param>

/// <returns></returns>

private bool AddWatermarkAndSave(string path, string fileName, string text, Image img,

int paddingTop, int paddingLeft, Color textColor, Font textFont)

{

text = text + ";" + "当前时间：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm");

if (!Directory.Exists(path))

{

Directory.CreateDirectory(path);

}

textFont = new Font("宋体", 19);

Bitmap bm = new Bitmap(img);

System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bm);

System.Drawing.Brush b = new SolidBrush(textColor);

string[] str = text.Split(';');

for (int i = 0; i < str.Length; i++)

g.DrawString(str[i], textFont, b, paddingLeft, paddingTop + 33 * i);

g.Dispose();

bm.Save(path + fileName, ImageFormat.Jpeg);

bm.Dispose();

return true;

}