[网络收集]使用ASP.net（C#）批量上传图片并自动生成缩略图,文字水印图,图片水印图

本程序主要功能有：

        （1）可以根据自己的需要更改上传到服务器上的目录，上传的源图、缩略图、文字水印图和图片水印图分别存入所定目录下的不同目录；

        （2）自动检查目录，如无所选择的目录，则自动创建它们；

        （3）自行设定生成缩略图的大小；

        （4）可以选择是否需要生成文字水印、图片水印，默认为不生成水印图；

        （5）可以添加、删除所需上传的图片。

        在本程序中均加了相关注释，所以直接发代码，不再多作解释。

   后台程序：
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;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;

/// 〈summary>
/// FileUpload1.HasFile 如果是true，则表示该控件有文件要上传
/// FileUpload1.FileName 返回要上传文件的名称，不包含路径信息
/// FileUpload1.FileContent 返回一个指向上传文件的流对象
/// FileUpload1.PostedFile   返回已经上传文件的引用
/// FileUpload1.PostedFile.ContentLength 返回上传文件的按字节表示的文件大小
/// FileUpload1.PostedFile.ContentType    返回上传文件的MIME内容类型，也就是文件类型，如返回"image/jpg"
/// FileUpload1.PostedFile.FileName       返回文件在客户端的完全路径（包括文件名全称）
/// FileUpload1.PostedFile.InputStream    返回一个指向上传文件的流对象
/// 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：
/// 〈/summary>

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 .Button5.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)
        {
            Label2.Text = Server.MapPath( "/" );
            TextBox3.Text = "ImageUpload" ;
            treePath = Server.MapPath( "/" ) + TextBox3.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( "/" ) + TextBox3.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" );
        }

         if (FileUpload1.HasFile)    //如果是true，则表示该控件有文件要上传
        {
             string fileContentType = FileUpload1.PostedFile.ContentType;
             if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg" )
            {
                 string name = FileUpload1.PostedFile.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/tzwhx.png" );　               // 服务器端水印图路径(图片)
                
                 if (!File.Exists(webFilePath))
                {
                     try
                    {
                        FileUpload1.SaveAs(webFilePath);                                 // 使用 SaveAs 方法保存文件
                         if (CheckBox1.Checked)                                           //是否生成文字水印图
                        {
                            AddWater(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
                        Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" + FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B" ;
                        Image1.ImageUrl = "/" + TextBox3.Text.ToString() + "/images/" + fileName;
                        TextBox1.Text = webFilePath;
                        TextBox2.Text = "/" + TextBox3.Text.ToString() + "/images/" + fileName;
                    }
                     catch (Exception ex)
                    {
                        Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
                    }
                }
                 else
                {
                    Label1.Text = "提示：文件已经存在，请重命名后上传" ;
                }
            }
             else
            {
                Label1.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 AddWater( string Path, string Path_sy)
    {
         string addText = "www.tzwhx.com" ;
        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>" );
    }
}
        另外，为解决大文件上传的限制，你必须在Web.config中加入以下代码。

< system.web>
    < httpRuntime executionTimeout= "90" maxRequestLength= "20000" useFullyQualifiedRedirectUrl= "false" requestLengthDiskThreshold= "8192" />
< /system.web>

摘自http://hi.baidu.com/zhifeng_mo/blog/item/9e1e81f55d8a822c730eec43.html