• 图片上传基类(带缩略,水印等等)


    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Web.UI.WebControls;
    using System.IO;
    using System.Web;
    using System.Drawing;

    namespace YXKJ.WEB
    {
        /// <summary>
        /// 通用上传文件类
        /// 周建波 于2008-2-28日
        /// </summary>
        public class FileUpLoadCommon
        {
            #region 私有属性字段
            private string _path;                   // 上传文件的路径
            private string _fileName;               // 文件名称
            private string _newFileName = "";            // 新的文件名
            private string _fileName_s;             // 缩略图文件名称
            private string _fileName_sy;            // 水印图文件名称(文字)
            private string _fileName_syp;           // 水印图文件名称(图片)
            private string _webFilePath;            // 服务器端文件路径
            private string _webFilePath_s;        // 服务器端缩略图路径
            private string _webFilePath_sy;        // 服务器端带水印图路径(文字)
            private string _webFilePath_syp;       // 服务器端带水印图路径(图片)
            private string _webFilePath_sypf;      // 服务器端水印图路径(图片)

            private string _errorMsg;               // 错误信息
            private bool _isDate = true;            // 是否加上日期
            private bool _isThumbnail = true;       // 是否产生缩图
            private bool _isWatermarkT = false;      // 是否产生水印文字
            private bool _isWatermarkP = false;      // 是否产生水印叠加图片
            private bool _isOnly = true;            // 是否只产生一个文件,原始文件+加水印文字+加水印图片


            //private bool _isImage = true;           // 是否只充许图片

            private int _width=35 ;               // 缩图宽度
            private int _height=25 ;               // 缩图高度
            private string _mode = "Auto";        // 缩图模式 "HW"://指定高宽缩放(可能变形)  "W"//指定宽,高按比例 "H"//指定高,宽按比例  "Cut"://指定高宽裁减(不变形) Auto:自动
            private string _addText = "YXKJ";   // 水印文字
            private string _addPicture = "~/inc/syimg/sy.gif";   // 水印图片

            private int _fileSize = 0;          // 图片大小
            private int _fileWidth = 0;         // 图片宽度
            private int _fileHeight = 0;        // 图片高度
            private string _fileType;           // 文件类型
            #endregion

            #region 属性 -- 旧文件名[只读]
            /// <summary>
            /// 旧文件名[只读]
            /// </summary>
            public string fileName
            {
                get
                {
                    return _fileName;
                }
            }
            #endregion


            #region 返回服务器端文件路径[只读]
            /// <summary>
            /// 返回文件路径[只读]
            /// </summary>
            public string webfilepath
            {
                get
                {
                    return _webFilePath;
                }
            }
            #endregion


            #region 返回服务器端缩略图片路径[只读]
            /// <summary>
            /// 返回服务器端缩略图片路径[只读]
            /// </summary>
            public string webfilepaths
            { get
               {
                return _webFilePath_s;
               }
            }
            #endregion

            #region 返回服务器端水印图片路径(文字)[只读]
            /// <summary>
            /// 返回服务器端水印图片路径(文字)[只读]
            /// </summary>
            public string webfilepathsy
            { get
                {
                return _webFilePath_sy;
                }
            }
            #endregion


            #region 显示错误信息
            /// <summary>
            /// 显示错误信息[只读]
            /// </summary>
            public string ErroMessage
            {
                get { return _errorMsg; }

            }
            #endregion


            #region 返回服务器端水印图片路径(图片)
            /// <summary>
            /// 返回服务器端水印图片路径(图片)[只读]
            /// </summary>
            public string webfilepathsyp
            {
                get { return _webFilePath_syp; }

            }
            #endregion

            #region 属性 -- 上传后新文件名
            /// <summary>
            /// 上传后新文件名[只读]
            /// </summary>
            public string newFileName
            {
                get
                {
                    return _newFileName;
                }
            }
            #endregion

            #region 属性 -- 缩图文件名
            /// <summary>
            /// 缩图文件名[只读]
            /// </summary>
            public string fileName_s
            {
                get
                {
                    return _fileName_s;
                }
            }
            #endregion

            #region 属性 -- 加文字水印的图片
            /// <summary>
            /// 加文字水印的图片[只读]
            /// </summary>
            public string fileName_sy
            {
                get
                {
                    return _fileName_sy;
                }
            }
            #endregion

            #region 属性 -- 加图片水印的图片
            /// <summary>
            /// 加图片水印的图片[只读]
            /// </summary>
            public string fileName_syp
            {
                get
                {
                    return _fileName_syp;
                }
            }
            #endregion

            #region 属性 -- 上传的文件的路径
            /// <summary>
            /// 上传的文件的路径[只读]
            /// </summary>
            public string path
            {
                get
                {
                    return _path;
                }
            }
            #endregion

            #region 属性 -- 文件大小
            /// <summary>
            /// 文件大小[只读]
            /// </summary>
            public int fileSize
            {
                get
                {
                    return _fileSize;
                }
            }
            #endregion

            #region 属性 -- 图片原始的宽度
            /// <summary>
            /// 图片原始的宽度[只读]
            /// </summary>
            public int fileWidth
            {
                get
                {
                    return _fileWidth;
                }
            }
            #endregion

            #region 属性 -- 图片原始的高度
            /// <summary>
            /// 图片原始的高度[只读]
            /// </summary>
            public int fileHeight
            {
                get { return _fileHeight; }
            }
            #endregion

            #region 属性 -- 文件的类型
            /// <summary>
            /// 文件的类型[只读]
            /// </summary>
            public string fileType
            {
                get { return _fileType; }
            }
            #endregion

            #region 属性 -- 设置水印文字
            /// <summary>
            /// 设置水印文字[只写]
            /// </summary>
            public string addText
            {
                set { _addText = value; }
            }
            #endregion

            #region 属性 -- 设置水印图片
            /// <summary>
            /// 设置水印图片[只写]
            /// </summary>
            public string addPicture
            {
                set { _addPicture = value; }
            }
            #endregion

            #region 构造函数
            /// <summary>
            /// 构造函数(../file/)该路径可以根据实际使用更改,设置True为根据时间生成子文件夹
            /// </summary>
            public FileUpLoadCommon()
                : this("../File/", true)
            {

            }

            /// <summary>
            /// 构造函数
            /// </summary>
            /// <param name="filePath">文件路径</param>
            /// <param name="isDate">是否按日期创建目录</param>
            public FileUpLoadCommon(string filePath, bool isDate)
            {
                _path = filePath;
                _isDate = isDate;
                if (_isDate)
                    _path += DateTime.Now.ToString("yyyyMMdd") + "/";

                string p = HttpContext.Current.Server.MapPath(_path);
                //如果目录不存在,将创建目录
                if (!Directory.Exists(p))
                    Directory.CreateDirectory(p);
            }
            #endregion

            #region 方法 -- 保存文件

            /// <summary>
            /// 指定缩图的宽高
            /// </summary>
            /// <param name="fu">文件类型</param>
            /// <param name="Width">宽</param>
            /// <param name="Height">高</param>
            /// <returns></returns>
            public bool SaveImage(FileUpload fu, int Width, int Height)
            {
                _width = Width;
                _height = Height;
                return SaveFile(fu, true);
            }

            /// <summary>
            /// 指定缩图的宽高
            /// </summary>
            /// <param name="fu">文件类型</param>
            /// <param name="Width">宽</param>
            /// <param name="Height">高</param>
            /// <param name="Mode">缩图模式 "HW"://指定高宽缩放(可能变形)  "W"//指定宽,高按比例 "H"//指定高,宽按比例  "Cut"://指定高宽裁减(不变形) </param>
            /// <returns></returns>
            public bool SaveImage(FileUpload fu, int Width, int Height, string Mode)
            {
                _width = Width;
                _height = Height;
                _mode = Mode;
                return SaveFile(fu, true);
            }
            #endregion


            #region "检测当前字符是否在以,号分开的字符串中(xx,sss,xaf,fdsf)"
            /// <summary>
            /// 检测当前字符是否在以,号分开的字符串中(xx,sss,xaf,fdsf)
            /// </summary>
            /// <param name="TempChar">需检测字符</param>
            /// <param name="TempStr">待检测字符串</param>
            /// <returns>存在true,不存在false</returns>
            public static bool Check_Char_Is(string TempChar, string TempStr)
            {
                bool rBool = false;
                if (TempChar != null && TempStr != null)
                {
                    string[] TempStrArray = TempStr.Split(',');
                    for (int i = 0; i < TempStrArray.Length; i++)
                    {
                        if (TempChar == TempStrArray[i].Trim())
                        {
                            rBool = true;
                            break;
                        }
                    }
                }
                return rBool;
            }
            #endregion


            #region 方法 -- 保存文件
            /// <summary>
            /// 保存文件
            /// </summary>
            /// <param name="fu">上传文件对象</param>
            /// <param name="IsImage">是否邮件</param>
            public bool SaveFile(FileUpload fu, bool IsImage)
            {
                if (fu.HasFile)
                {
                    string fileContentType = fu.PostedFile.ContentType;

                    string name = fu.PostedFile.FileName;                        // 客户端文件路径
                    FileInfo file = new FileInfo(name);
                    _fileType = fu.PostedFile.ContentType;
                    _fileSize = fu.PostedFile.ContentLength;

                    bool isfileTypeImages = false;
                    if (fileContentType == "image/x-png" || fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
                    {
                        isfileTypeImages = true;
                    }

                    if (IsImage == true && isfileTypeImages == false)
                    {
                        _errorMsg = "文件类型不是图片!";
                        fu.Dispose();
                        return false;
                    }

                    //检测文件扩展名是否正确
                    //"html,txt,doc,jpg"这些内容可以根据数据库,也可以根据webconfig.xml设置
                    //文件允许大小[这里为(2000)即2M]也可以根据数据库或者 webconfig.xml设置
                    if (!Check_Char_Is(file.Extension.Substring(1).ToLower(), "html,txt,doc,jpg"))
                    {
                        _errorMsg = string.Format("文件扩展名不符合系统需求:{0}", "html,txt,doc,jpg");
                        fu.Dispose();
                        return false;
                    }
                    if (_fileSize / 1024 > 2000)
                    {
                        _errorMsg = string.Format("上传文件超过系统允许大小:{0}K", 2000);
                        fu.Dispose();
                        return false;
                    }


                    _fileName = file.Name;                                // 文件名称
                    _newFileName = CreateFileName() + file.Extension;
                    _webFilePath = HttpContext.Current.Server.MapPath(_path + _newFileName);         // 服务器端文件路径

                    if (isfileTypeImages)//如果是图片
                    {
                        _fileName_s = "s_" + _newFileName;                      // 缩略图文件名称
                        if (_isOnly)
                        {
                            _fileName_sy = _newFileName;                     // 水印图文件名称(文字)
                            _fileName_syp = _newFileName;                    // 水印图文件名称(图片)
                        }
                        else
                        {
                            _fileName_sy = "sy_" + _newFileName;                     // 水印图文件名称(文字)
                            _fileName_syp = "syp_" + _newFileName;                    // 水印图文件名称(图片)
                        }


                        _webFilePath_s = HttpContext.Current.Server.MapPath(_path + _fileName_s);     // 服务器端缩略图路径
                        _webFilePath_sy = HttpContext.Current.Server.MapPath(_path + _fileName_sy);     // 服务器端带水印图路径(文字)
                        _webFilePath_syp = HttpContext.Current.Server.MapPath(_path + _fileName_syp);    // 服务器端带水印图路径(图片)
                        _webFilePath_sypf = HttpContext.Current.Server.MapPath(_addPicture);   // 服务器端水印图路径(图片)   

                        //检查文件是否存在
                        if (!File.Exists(_webFilePath))
                        {
                            try
                            {
                                fu.SaveAs(_webFilePath);                                 // 使用 SaveAs 方法保存文件    

                                if (_isWatermarkT)
                                    AddShuiYinWord(_webFilePath, _webFilePath_sy);
                                if (_isWatermarkP)
                                    AddShuiYinPic(_webFilePath, _webFilePath_syp, _webFilePath_sypf);
                                if (_isThumbnail)
                                    MakeThumbnail(_webFilePath, _webFilePath_s, _width, _height, _mode);   // 生成缩略图方法

                                // 只有上传完了,才能获取图片大小
                                if (File.Exists(_webFilePath))
                                {
                                    System.Drawing.Image originalImage = System.Drawing.Image.FromFile(_webFilePath);
                                    try
                                    {
                                        _fileHeight = originalImage.Height;
                                        _fileWidth = originalImage.Width;
                                    }
                                    finally
                                    {
                                        originalImage.Dispose();
                                    }
                                }

                                _errorMsg = string.Format("提示:文件“{0}”成功上传,并生成“{1}”缩略图,文件类型为:{2},文件大小为:{3}B", _newFileName, _fileName_s, fu.PostedFile.ContentType, fu.PostedFile.ContentLength);
                                fu.Dispose();
                                return true;
                            }
                            catch (Exception ex)
                            {
                                _errorMsg = "提示:文件上传失败,失败原因:" + ex.Message;
                            }
                        }
                        else
                        {


                            _errorMsg = "提示:文件已经存在,请重命名后上传";
                        }
                    }
                    else
                    {
                        //上传文件
                        //检查文件是否存在
                        if (!File.Exists(_webFilePath))
                        {
                            try
                            {
                                fu.SaveAs(_webFilePath);                                 // 使用 SaveAs 方法保存文件
                                _errorMsg = string.Format("提示:文件“{0}”成功上传,并生成“{1}”缩略图,文件类型为:{2},文件大小为:{3}B", _newFileName, _fileName_s, fu.PostedFile.ContentType, fu.PostedFile.ContentLength);
                                fu.Dispose();
                                return true;
                            }
                            catch (Exception ex)
                            {
                                _errorMsg = "提示:文件上传失败,失败原因:" + ex.Message;
                            }
                        }
                        else
                            _errorMsg = "提示:文件已经存在,请重命名后上传";

                    }
                }
                fu.Dispose();
                return false;
            }
            #endregion

            #region 方法 -- 创建新的文件名
            /// <summary>
            /// 创建新的文件名
            /// </summary>
            /// <returns></returns>
            public string CreateFileName()
            {
                string guid = System.Guid.NewGuid().ToString().ToLower();
                guid = guid.Replace("-", "");

                return DateTime.Now.ToString("yyyyMMddhhmmss") + guid.Substring(0, 4);
            }
            #endregion

            #region 方法 -- 删除文件
            /// <summary>
            /// 删除文件
            /// </summary>
            /// <param name="filename"></param>
            public static void DeleteFile(string filename)
            {
                string s = HttpContext.Current.Server.MapPath(filename);
                if (File.Exists(s))
                {
                    try
                    {
                        File.Delete(s);
                    }
                    catch
                    { }
                }
            }
            #endregion

            #region 方法 -- 生成缩略图
            /**/
            /// <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;

                if (ow < towidth && oh < toheight)
                {
                    originalImage.Save(thumbnailPath);
                }
                else
                {

                    switch (mode.ToUpper())
                    {
                        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;
                        case "AUTO": //自动适应高度
                            if (ow > oh)
                            {
                                //newwidth = 200;
                                toheight = (int)((double)oh / (double)ow * (double)towidth);
                            }
                            else
                            {
                                //newheight = 200;
                                towidth = (int)((double)ow / (double)oh * (double)toheight);
                            }
                            break;
                        default:
                            break;
                    }

                    //进行缩图
                    Bitmap img = new Bitmap(towidth, toheight);
                    img.SetResolution(72f, 72f);
                    Graphics gdiobj = Graphics.FromImage(img);
                    gdiobj.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                    gdiobj.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                    gdiobj.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                    gdiobj.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
                    gdiobj.FillRectangle(new SolidBrush(Color.White), 0, 0,
                                    towidth, toheight);
                    Rectangle destrect = new Rectangle(0, 0,
                                    towidth, toheight);
                    gdiobj.DrawImage(originalImage, destrect, 0, 0, ow,
                                    oh, GraphicsUnit.Pixel);
                    System.Drawing.Imaging.EncoderParameters ep = new System.Drawing.Imaging.EncoderParameters(1);
                    ep.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)100);
                    System.Drawing.Imaging.ImageCodecInfo ici = GetEncoderInfo("image/jpeg");
                    try
                    {
                        if (ici != null)
                        {
                            img.Save(thumbnailPath, ici, ep);
                        }
                        else
                        {
                            img.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
                        }
                    }
                    catch (System.Exception e)
                    {
                        throw e;
                    }
                    finally
                    {
                        gdiobj.Dispose();
                        img.Dispose();
                    }
                }
                originalImage.Dispose();
            }


            private static System.Drawing.Imaging.ImageCodecInfo GetEncoderInfo(String mimeType)
            {
                int j;
                System.Drawing.Imaging.ImageCodecInfo[] encoders;
                encoders = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
                for (j = 0; j < encoders.Length; ++j)
                {
                    if (encoders[j].MimeType == mimeType)
                        return encoders[j];
                }
                return null;
            }

            #endregion

            #region 方法 -- 在图片上增加文字水印
            /**/
            /// <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 AddShuiYinWord(string Path, string Path_sy)
            {
                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", 16);
                System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);

                g.DrawString(_addText, f, b, 15, 15);
                g.Dispose();

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

            #region 方法 -- 在图片上生成图片水印
            /**/
            /// <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 AddShuiYinPic(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();
            }
            #endregion
        }
    }



    以下介绍如何使用

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

    <!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>
            <asp:FileUpload ID="FileUpload1" runat="server" />
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" />
            <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label></div>
        </form>
    </body>
    </html>


    CS文件

    using System;
    using System.Data;
    using System.Configuration;
    using System.Collections;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using YXKJ.WEB;//添加命名空间的引用

    //周建波
    //2008-2-28
    public partial class MyOffice_Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            if (this.FileUpload1.PostedFile.FileName != "")
            {
                FileUpLoadCommon up = new FileUpLoadCommon();

                up.CreateFileName();
                up.SaveFile(FileUpload1, false);
                this.Label1.Text= up.webfilepath;
      
           
            }

        }
    }

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  • 原文地址:https://www.cnblogs.com/zjba2/p/1085094.html
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