Asp.net上传图片同时生成缩略图和水印图

前台代码：

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

<!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 id="Head1" runat="server">
    <title>自动上传图片并加文字或图行水印</title>
    <script type="text/javascript">
        var i=1;
        function addFile()
        {
            if (i<1000)
            {
                var str = '<BR><input type="file" name="File" runat="server" style=" 478px"/>'
                document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str);
            }
            else
            {
                alert("您一次最多只能上传1000张图片！");
            }
            i++;
        }
     </script>
</head>
<body>
    <form id="form1" runat="server" method="post" enctype="multipart/form-data">
    <label for="pagebody1" style="display: none">
    </label>
    <fieldset id="container">
        <legend>上传图片并加文字或图行水印</legend>
        <div class="window" style="list-style: none;">
            <div style="padding: 0px; 808px; height: 200px; float: left; margin-right: 0px;">
                <ul>
                    <li style=" 150px; margin: 0px; padding: 0px; float: left;">
                        原始图<br /><asp:Image ID="Image1" runat="server" Height="200px" BorderWidth="2px" Width="150px"
                            ImageUrl="~/images/free.jpg" />
                    </li>
                    <li style=" 150px; margin: 0px; padding: 0px; float: left;">
                        缩略图<br /><asp:Image ID="Image2" runat="server" Height="200px" BorderWidth="2px" Width="150px"
                            ImageUrl="~/images/free.jpg" />
                    </li>
                    <li style=" 400px; margin: 0px; float: right;">
                        (1)图片将保存在你网站根目录<asp:TextBox ID="txtDir" runat="server"></asp:TextBox>中，你可以修改它，但建议你使用默认目录。<br />
                        (2)上传图片保存在所建目录的子目录 /images下；缩略图在 /thumbnails下；文字水印图在 /textImages下；图形水印图在 /waterImages目录下。<br />
                        (3)生成的缩略图的默认宽度和高度均为100px，你也可以修改它们，宽为： <asp:TextBox ID="TextBox4" runat="server" Width="54px"></asp:TextBox>高为：<asp:TextBox
                            ID="TextBox5" runat="server" Width="56px"></asp:TextBox><br />
                        <asp:CheckBox ID="CheckBox1" runat="server" Text="文字水印" />
                        <asp:CheckBox ID="CheckBox2" runat="server" Text="图形水印" /><br />
                        你可以选择是否生成水印图，默认不生成。 </li>
                </ul>
            </div>
        </div>
        <div>
            <p id="MyFile" runat="server">
            <input id="File1" type="file" name="File" runat="server" style=" 478px"/>
            </p>
        </div>
        <div>
            <asp:TextBox ID="TextBox1" runat="server" Width="400px"></asp:TextBox><br />
            <asp:TextBox ID="TextBox2" runat="server" Width="400px"></asp:TextBox>
        </div>
        <div>
            <asp:Button ID="Upload" runat="server" Text="上传" Style="height: 26px" OnClick="Btnload_Click" />
            <input onclick="addFile()" type="button" value="添加图片"/>
            <asp:Button ID="AddAllFile" runat="server" Text="全部添加" Enabled="False" />
            <asp:Button ID="DelFile" runat="server" Text="删除" />
            <asp:Button ID="btnExit" runat="server" Text="完成" /><br />
            <asp:Label ID="lblMessage" runat="server" Text=""></asp:Label>
        </div>
        <div>

        </div>
    </fieldset>
    </form>
</body>
</html>

后台代码：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
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.IO;
using System.Net;
using System.Text.RegularExpressions;

public partial class BackManagement_ImagesUpload : System.Web.UI.Page
{
    public string treePath = "";
    public int imageW = 100;
    public int imageH = 100;
    protected void Page_Load(object sender, EventArgs e)
    {
        this.btnExit.Attributes.Add("Onclick", "window.close();"); //在本地关闭当前页，而不需要发送到服务器去关闭当前页时
        if (!Page.IsPostBack)
        {
            txtDir.Text = "ImageUpload";
            treePath = Server.MapPath("~/") + txtDir.Text.Trim() + "/";
            TextBox4.Text = imageW.ToString();
            TextBox5.Text = imageH.ToString();
        }
    }
    protected void Btnload_Click(object sender, EventArgs e)
    {
        //如果保存图片的目录不存在，由创建它
        treePath = Server.MapPath("~/") + txtDir.Text.Trim() + "/";
        imageW = Convert.ToInt32(TextBox4.Text.ToString());
        imageH = Convert.ToInt32(TextBox5.Text.ToString());
        if (!File.Exists(treePath + "images"))   //如果/ImageUpload/images不存在，则创建/ImageUpload/images，用于存放源图片
        {
            System.IO.Directory.CreateDirectory(treePath + "images");
        }
        if (!File.Exists(treePath + "thumbnails"))   //如果/ImageUpload/thumbnails不存在，则创建/ImageUpload/thumbnails，用于存放缩略图片
        {
            System.IO.Directory.CreateDirectory(treePath + "thumbnails");
        }
        if (!File.Exists(treePath + "textImages"))   //如果/ImageUpload/textImages不存在，则创建/ImageUpload/textImages，用于存文字水印图片
        {
            System.IO.Directory.CreateDirectory(treePath + "textImages");
        }
        if (!File.Exists(treePath + "waterImages"))   //如果/ImageUpload/waterImages不存在，则创建/ImageUpload/waterImages，用于存图形水印图片
        {
            System.IO.Directory.CreateDirectory(treePath + "waterImages");
        }

System.Web.HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;

        for (int i = 0; i < files.Count; i++)
        {
            System.Web.HttpPostedFile myFile = files[i];
            string FileName = "";
            FileName = System.IO.Path.GetFileName(myFile.FileName);

            if (FileName.Length > 0)//有文件才执行上传操作再保存到数据库
            {
                string fileContentType = myFile.ContentType;
                if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
                {
                    string name = myFile.FileName;                   //返回文件在客户端的完全路径（包括文件名全称）

                    FileInfo file = new FileInfo(name);                                    //FileInfo对象表示磁盘或网络位置上的文件。提供文件的路径，就可以创建一个FileInfo对象：
                    string fileName = file.Name;                                           // 文件名称
                    string fileName_s = "x_" + file.Name;                                  // 缩略图文件名称
                    string fileName_sy = "text_" + file.Name;                              // 水印图文件名称（文字）
                    string fileName_syp = "water_" + file.Name;                            // 水印图文件名称（图片）

                    string webFilePath = treePath + "images/" + fileName;          // 服务器端文件路径
                    string webFilePath_s = treePath + "thumbnails/" + fileName_s;　　 // 服务器端缩略图路径
                    string webFilePath_sy = treePath + "textImages/" + fileName_sy;　 // 服务器端带水印图路径(文字)
                    string webFilePath_syp = treePath + "waterImages/" + fileName_syp;　// 服务器端带水印图路径(图片)
                    string webFilePath_sypf = Server.MapPath("~/images/water.png");　              // 服务器端水印图路径(图片)

                    if (!File.Exists(webFilePath))
                    {
                        try
                        {
                            myFile.SaveAs(webFilePath);                                // 使用 SaveAs 方法保存文件
                            if (CheckBox1.Checked)                                          //是否生成文字水印图
                            {
                                AddWaterText(webFilePath, webFilePath_sy);
                            }
                            if (CheckBox2.Checked)                                          //是否生成图形水印图
                            {
                                AddWaterPic(webFilePath, webFilePath_syp, webFilePath_sypf);
                            }
                            MakeThumbnail(webFilePath, webFilePath_s, imageW, imageH, "Cut");     // 生成缩略图方法
                            lblMessage.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" + myFile.ContentType + "，文件大小为：" + myFile.ContentLength + "B";
                            Image1.ImageUrl = "~/" + txtDir.Text.ToString() + "/images/" + fileName;
                            Image2.ImageUrl = "~/" + txtDir.Text.ToString() + "/thumbnails/" + "x_" + fileName;
                            TextBox1.Text = webFilePath;
                            TextBox2.Text = "/" + txtDir.Text.ToString() + "/images/" + fileName;
                        }
                        catch (Exception ex)
                        {
                            lblMessage.Text = "提示：文件上传失败，失败原因：" + ex.Message;
                        }
                    }
                    else
                    {
                        lblMessage.Text = "提示：文件已经存在，请重命名后上传";
                    }
                }
                else
                {
                    lblMessage.Text = "提示：文件类型不符";
                }
            }
        }
    }

    /**/
    /// <summary>
    /// 生成缩略图
    /// </summary>
    /// <param name="originalImagePath">源图路径（物理路径）</param>
    /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
    /// <param name="width">缩略图宽度</param>
    /// <param name="height">缩略图高度</param>
    /// <param name="mode">生成缩略图的方式</param>
    public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
    {
        System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);

int towidth = width;
int toheight = height;

        int x = 0;
        int y = 0;
        int ow = originalImage.Width;
        int oh = originalImage.Height;

        switch (mode)
        {
            case "HW"://指定高宽缩放（可能变形）
                break;
            case "W"://指定宽，高按比例
                toheight = originalImage.Height * width / originalImage.Width;
                break;
            case "H"://指定高，宽按比例
                towidth = originalImage.Width * height / originalImage.Height;
                break;
            case "Cut"://指定高宽裁减（不变形）
                if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                {
                    oh = originalImage.Height;
                    ow = originalImage.Height * towidth / toheight;
                    y = 0;
                    x = (originalImage.Width - ow) / 2;
                }
                else
                {
                    ow = originalImage.Width;
                    oh = originalImage.Width * height / towidth;
                    x = 0;
                    y = (originalImage.Height - oh) / 2;
                }
                break;
            default:
                break;
        }

//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);

        //在指定位置并且按指定大小绘制原图片的指定部分
        g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
            new System.Drawing.Rectangle(x, y, ow, oh),
            System.Drawing.GraphicsUnit.Pixel);

        try
        {
            //以jpg格式保存缩略图
            bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
        }
        catch (System.Exception e)
        {
            throw e;
        }
        finally
        {
            originalImage.Dispose();
            bitmap.Dispose();
            g.Dispose();
        }
    }

    /**/
    /// <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="Path_sy">生成的带文字水印的图片路径</param>
    protected void AddWaterText(string Path, string Path_sy)
    {
        string addText = "深圳力致文化传播有限公司";
        System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
        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", 10);    //字体位置为左空10
        System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);

g.DrawString(addText, f, b, 14, 14); //字体大小为14X14
g.Dispose();

        image.Save(Path_sy);
        image.Dispose();
    }

    /**/
    /// <summary>
    /// 在图片上生成图片水印
    /// </summary>
    /// <param name="Path">原服务器图片路径</param>
    /// <param name="Path_syp">生成的带图片水印的图片路径</param>
    /// <param name="Path_sypf">水印图片路径</param>
    protected void AddWaterPic(string Path, string Path_syp, string Path_sypf)
    {
        System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
        System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
        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);
        g.Dispose();

        image.Save(Path_syp);
        image.Dispose();
    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        //自动保存远程图片
        WebClient client = new WebClient();
        //备用Reg:<img.*?src=([\"\'])(http:\/\/.+\.(jpg|gif|bmp|bnp))\1.*?>
        Regex reg = new Regex("IMG[^>]*?src\\s*=\\s*(?:\"(?<1>[^\"]*)\"|'(?<1>[^\']*)')", RegexOptions.IgnoreCase);
        MatchCollection m = reg.Matches(TextBox1.Text);

        foreach (Match math in m)
        {
            string imgUrl = math.Groups[1].Value;

//在原图片名称前加YYMMDD重名名并上传

Regex regName = new Regex(@"\w+.(?:jpg|gif|bmp|png)", RegexOptions.IgnoreCase);

string strNewImgName = DateTime.Now.ToShortDateString().Replace("-", "") + regName.Match(imgUrl).ToString();

            try
            {
                //保存图片
                //client.DownloadFile(imgUrl, Server.MapPath("../ImageUpload/Auto/" + strNewImgName));

            }
            catch
            {
            }
            finally
            {

}

client.Dispose();
}

Response.Write("<script>alert('远程图片保存成功，保存路径为ImageUpload/auto')</script>");
}
}

web.config的配置：

<?xml version="1.0" encoding="utf-8"?>

<configuration>
    <appSettings/>
    <connectionStrings/>
    <system.web>
      <httpRuntime executionTimeout="90" maxRequestLength="20000" useFullyQualifiedRedirectUrl="false" requestLengthDiskThreshold="8192"/>
      
      <compilation debug="true" />
        
        <authentication mode="Windows" />
        <!--
            如果在执行请求的过程中出现未处理的错误，
            则通过 <customErrors> 节可以配置相应的处理步骤。具体说来，
            开发人员通过该节可以配置
            要显示的 html 错误页
            以代替错误堆栈跟踪。