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Asp.net上传图片同时生成文字水印图，图片水印图，缩略图
.aspx
<body>
<form runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" /><br />
<asp:Button ID="Button1" runat="server" Text="上传图片" />
</div>
</form>
</body>
.cs
protected void Button1_Click(object sender, EventArgs e)
{
string fileContentType = this.FileUpload1.PostedFile.ContentType;
if (this.FileUpload1.HasFile)
{
if (fileContentType == "image/bmp" || fileContentType == "image/gif" ||
fileContentType == "image/pjpeg")
{
// 文件名，如1.jpeg
string filename = this.FileUpload1.FileName;
// 控件里的源路径,如C://1.jpeg
string fullfilename = this.FileUpload1.PostedFile.FileName;
// 上传至服务器的图片路径
string webfilename = Server.MapPath("image/" + filename);
// 上传至服务器的文字水印图片路径
string textwaterwebfilename = Server.MapPath("textwater/" + filename);
// 上传至服务器的图片水印图片路径
string picwaterfilename = Server.MapPath("picwater/" + filename);
// 水印图片
string waterpic = Server.MapPath("picwater/waterpic.png");
// 缩略图
string thumbnailfilename = Server.MapPath("thumbnailpic/" + filename);
// 检验文件尺寸
if (IsPecificSize(fullfilename, 150, 200))
{
if (!File.Exists(webfilename))
{
this.FileUpload1.SaveAs(webfilename);
SaveTextWaterImage(webfilename, textwaterwebfilename); // 给图片添
加文字水印
SavePicWaterImage(webfilename, picwaterfilename, waterpic);// 给图片添
加图片水印
GetThumbnailPic(webfilename, thumbnailfilename, 80, 80);
}
else
{
Response.Write("<script>alert('图片已经存在')</script>");
}
}
else
{
Response.Write("<script>alert('文件大小不符,必须是50*50的大小')
</script>");
}
}
else
{
Response.Write("<script>alert('文件类型不符')</script>");
}
}
}
/// <summary>
/// 是否符合规定大小
/// </summary>
/// <param name="path">源图片路径</param>
/// <param name="width">宽,单位为像素</param>
/// <param name="height">高，单位为像素</param>
/// <returns></returns>
private bool IsPecificSize(string path, int width, int height)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(path);
if (image.Width == width && image.Height == height)
return true;
else
return false;
}
/// <summary>
/// 在图片上增加文字水印
/// </summary>
/// <param name="path">原服务器图片路径</param>
/// <param name="newpath">生成的带文字水印的图片路径</param>
private void SaveTextWaterImage(string path, string newpath)
{
string addText = "xuyue";
System.Drawing.Image image = System.Drawing.Image.FromFile(path); // 从指定的文件
创建
System.Drawing.Image
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Font f = new System.Drawing.Font("Verdana", 15);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
g.DrawString(addText, f, b,70,170);
g.Dispose();
image.Save(newpath);
image.Dispose();
}
/// <summary>
/// 在图片上生成图片水印
/// </summary>
/// <param name="path">源图片路径</param>
/// <param name="newpath">新图片路径</param>
/// <param name="waterpicpath">水印图片路径</param>
private void SavePicWaterImage(string path, string newpath, string waterpicpath)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(path);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
System.Drawing.Image waterimage = System.Drawing.Image.FromFile(waterpicpath);
g.DrawImage(waterimage, new System.Drawing.Rectangle
(image.Width - waterimage.Width, image.Height - waterimage.Height,
waterimage.Width, waterimage.Height), 0, 0, waterimage.Width,
waterimage.Height, System.Drawing.GraphicsUnit.Pixel);
g.Dispose();
image.Save(newpath);
image.Dispose();
}
/// <summary>
/// 获得缩略图
/// </summary>
/// <param name="originalpicpath">源图路径</param>
/// <param name="smallpicpath">缩略成小图后的新地址</param>
/// <param name="smallwidth">小图的宽度</param>
/// <param name="smallheight">小图的高度</param>
private void GetThumbnailPic(string originalpicpath,string smallpicpath,int
smallwidth,int smallheight )
{
// 定义变量
System.Drawing.Image.GetThumbnailImageAbort callb = null;
System.Drawing.Image imageSmall, imageBig;
// 加载大图片
imageBig = System.Drawing.Image.FromFile(originalpicpath);
//开始生成
imageSmall = imageBig.GetThumbnailImage(smallwidth, smallheight, callb, new
System.IntPtr());
//保存缩略图
imageSmall.Save(smallpicpath);
//释放图片对象资源
imageSmall.Dispose();
imageBig.Dispose();
}
最后更新：2017-04-02 06:52:24