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使用FileUpload控件上传图片并自动生成缩略图、带文字和图片的水印图

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="upfile.aspx.cs" Inherits="upfile_upfile" %>

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>无标题页</title>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<asp:FileUpload ID="FileUpload1" runat="server" />
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<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />
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<asp:Label ID="Label1" runat="server"></asp:Label></div>
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</form>
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</body>
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</html>

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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.IO;
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public partial class upfile_upfile : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{ }
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protected void Button1_Click(object sender, EventArgs e)
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{
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if (FileUpload1.HasFile)
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{
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string fileContentType = FileUpload1.PostedFile.ContentType;
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if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
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{
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string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
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FileInfo file = new FileInfo(name);
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string fileName = file.Name; // 文件名称
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string fileName_s = "s_" + file.Name; // 缩略图文件名称
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string fileName_sy = "sy_" + file.Name; // 水印图文件名称（文字）
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string fileName_syp = "syp_" + file.Name; // 水印图文件名称（图片）
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string webFilePath = Server.MapPath("file/" + fileName); // 服务器端文件路径
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string webFilePath_s = Server.MapPath("file/" + fileName_s);　　// 服务器端缩略图路径
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string webFilePath_sy = Server.MapPath("file/" + fileName_sy);　// 服务器端带水印图路径(文字)
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string webFilePath_syp = Server.MapPath("file/" + fileName_syp);　// 服务器端带水印图路径(图片)
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string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg");　// 服务器端水印图路径(图片)
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if (!File.Exists(webFilePath))
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{
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try
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{
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FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
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AddShuiYinWord(webFilePath, webFilePath_sy);
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AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);
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MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成缩略图方法
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Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" +
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FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B";
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}
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catch (Exception ex)
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{
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Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
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}
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}
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else
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{
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Label1.Text = "提示：文件已经存在，请重命名后上传";
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}
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}
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else
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{
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Label1.Text = "提示：文件类型不符";
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}
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}
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}
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/**/
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/// <summary>
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/// 生成缩略图
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/// </summary>
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/// <param name="originalImagePath">源图路径（物理路径）</param>
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/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
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/// <param name="width">缩略图宽度</param>
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/// <param name="height">缩略图高度</param>
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/// <param name="mode">生成缩略图的方式</param>
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public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
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{
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System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
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int towidth = width;
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int toheight = height;
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int x = 0;
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int y = 0;
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int ow = originalImage.Width;
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int oh = originalImage.Height;
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switch (mode)
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{
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case "HW"://指定高宽缩放（可能变形）
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break;
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case "W"://指定宽，高按比例
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toheight = originalImage.Height * width / originalImage.Width;
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break;
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case "H"://指定高，宽按比例
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towidth = originalImage.Width * height / originalImage.Height;
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break;
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case "Cut"://指定高宽裁减（不变形）
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if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
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{
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oh = originalImage.Height;
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ow = originalImage.Height * towidth / toheight;
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y = 0;
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x = (originalImage.Width - ow) / 2;
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}
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else
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{
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ow = originalImage.Width;
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oh = originalImage.Width * height / towidth;
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x = 0;
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y = (originalImage.Height - oh) / 2;
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}
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break;
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default:
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break;
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}
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//新建一个bmp图片
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System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
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//新建一个画板
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System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
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//设置高质量插值法
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g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
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//设置高质量,低速度呈现平滑程度
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g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//清空画布并以透明背景色填充
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g.Clear(System.Drawing.Color.Transparent);
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//在指定位置并且按指定大小绘制原图片的指定部分
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g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
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new System.Drawing.Rectangle(x, y, ow, oh),
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System.Drawing.GraphicsUnit.Pixel);
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try
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{
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//以jpg格式保存缩略图
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bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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catch (System.Exception e)
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{
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throw e;
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}
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finally
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{
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originalImage.Dispose();
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bitmap.Dispose();
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g.Dispose();
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}
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}
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/**/
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/// <summary>
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/// 在图片上增加文字水印
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/// </summary>
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/// <param name="Path">原服务器图片路径</param>
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/// <param name="Path_sy">生成的带文字水印的图片路径</param>
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protected void AddShuiYinWord(string Path, string Path_sy)
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{
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string addText = "测试水印";
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System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
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System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
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g.DrawImage(image, 0, 0, image.Width, image.Height);
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System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
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System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);
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g.DrawString(addText, f, b, 15, 15);
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g.Dispose();
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image.Save(Path_sy);
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image.Dispose();
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}
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/**/
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/// <summary>
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/// 在图片上生成图片水印
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/// </summary>
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/// <param name="Path">原服务器图片路径</param>
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/// <param name="Path_syp">生成的带图片水印的图片路径</param>
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/// <param name="Path_sypf">水印图片路径</param>
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protected void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)
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{
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System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
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System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
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System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
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g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
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g.Dispose();
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image.Save(Path_syp);
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image.Dispose();
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}
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}
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posted on 2007-09-06 16:02 Sanney 阅读(423) 评论(0) 收藏举报

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