图片加文字水印
default.aspx
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
上传图片：<asp:FileUpload ID="uploadImage" runat="server" />
<br />
生成图片宽度：<asp:TextBox ID="TextBox1" runat="server">500</asp:TextBox>
<br />
生成图片高度：<asp:TextBox ID="TextBox2" runat="server">500</asp:TextBox>
<br />
每行显示字符数：<asp:TextBox ID="TextBox4" runat="server">20</asp:TextBox>
<br />
水印文字：<asp:TextBox ID="TextBox3" runat="server" TextMode="MultiLine">在人生的道路上，如果你没有耐心去等待成功的到来，那么你只好用一生的时间去等待失败！</asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="提交" />
<br />
</div>
</form>
</body>
</html>
default.aspx.cs
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
HttpPostedFile hpf = uploadImage.PostedFile;
//取得文件名，不含路径
char[] splitChar = { '\\' };
string[] FilenameArray = hpf.FileName.Split(splitChar);
string Filename = FilenameArray[FilenameArray.Length - 1].ToLower();
//将用户输入的水印文字处理
//string sMessage = lineStr(TextBox3.Text.Trim().ToString(), 20);
if (hpf.FileName.Length < 1)
{
Response.Write("请选择你要上传的图片文件");
return;
}
if (hpf.ContentType != "image/pjpeg" && hpf.ContentType != "image/gif")//5~1-a-s-p-x
{
Response.Write("只允许上传JPEG GIF文件");
return;
}
else
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append(DateTime.Now.Year.ToString());
sb.Append(DateTime.Now.Month.ToString());
sb.Append(DateTime.Now.Day.ToString());
sb.Append(DateTime.Now.Hour.ToString());
sb.Append(DateTime.Now.Minute.ToString());
sb.Append(DateTime.Now.Second.ToString());
if (Filename.ToLower().EndsWith("gif"))
sb.Append(".gif");
else if (Filename.ToLower().EndsWith("jpg"))
sb.Append(".jpg");
else if (Filename.ToLower().EndsWith("jpeg"))
sb.Append(".jpeg");
Filename = sb.ToString();
//保存图片到服务器上
try
{
hpf.SaveAs(Server.MapPath("~") + "/Image/" + Filename);
}
catch (Exception ee)
{
Response.Write("上传图片失败，原因：" + ee.Message);
return;
}
//生成缩略图
//原始图片名称
string originalFilename = hpf.FileName;
//生成高质量图片名称
string strFile = Server.MapPath("~") + "/Image/Small_" + Filename;
//从文件获取图片对象
System.Drawing.Image image = System.Drawing.Image.FromStream(hpf.InputStream, true);
Double Width = Double.Parse(TextBox1.Text.Trim());
Double Height = Double.Parse(TextBox2.Text.Trim());
System.Double newWidth, newHeight;
if (image.Width > image.Height)
{
newWidth = Width;
newHeight = image.Height * (newWidth / image.Width);
}
else
{
newHeight = Height;
newWidth = image.Width * (newHeight / image.Height);
}
if (newWidth > Width)
newWidth = Width;
if (newHeight > Height)
newHeight = Height;
System.Drawing.Size size = new System.Drawing.Size((int)newWidth, (int)newHeight); //设置图片的宽度和高度
System.Drawing.Image bitmap = new System.Drawing.Bitmap(size.Width, size.Height); //新建bmp图片
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); //新建画板
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //制定高质量插值法
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //设置高质量、低速度呈现平滑程度
g.Clear(System.Drawing.Color.White); //清空画布
//在制定位置画图
g.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);
//文字水印
System.Drawing.Graphics testGrahpics = System.Drawing.Graphics.FromImage(bitmap);
System.Drawing.Font font = new System.Drawing.Font("宋体", 10);
System.Drawing.Brush brush = new System.Drawing.SolidBrush(System.Drawing.Color.Black);
//分行
string sInput = TextBox3.Text.Trim().ToString(); //获取输入的水印文字
int coloum = Convert.ToInt32(TextBox4.Text); //获取每行的字符数
//利用循环，来依次输出
for (int i = 0, j = 0; i < sInput.Length; i += coloum, j++)
{
//若要修改水印文字在照片上的位置，可将20修改成你想要的任何值
if (j != sInput.Length / coloum)
{
string s = sInput.Substring(i, coloum);
testGrahpics.DrawString(s, font, brush, 20, 20 * (i / coloum + 1));
}
else
{
string s = sInput.Substring(i, sInput.Length % coloum);
testGrahpics.DrawString(s, font, brush, 20, 20*(j+1));
}
}
testGrahpics.Dispose();
//保存缩略图c
try
{
bitmap.Save(strFile, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (Exception ex)
{
Response.Write("保存缩略图失败" + ex.Message);
}
//释放资源
g.Dispose();
bitmap.Dispose();
image.Dispose();
}
}
}
