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长沙网站制作公司专业制做网站图片上传代码

本文来源: asp.net图片上传      本文作者:图片上传源码      发布时间:2017-07-15


不管是大型的营销型平台还是门户网站在后台使用的过程中,图片上传是普遍使用的一个功能,
长沙做网站为了节省开发时间,将图片上传的方法进行了分装,这样可以有效地提供开发效率。
 
using System.IO;
using System.Web;
using System.Web.UI.HtmlControls;
using System.Drawing;

/// <summary>
/// 文件类型
/// </summary>
public enum FileExtension
{
    JPG = 255216,
    GIF = 7173,
    BMP = 6677,
    PNG = 13780,
    RAR = 8297,
    jpg = 255216,
    exe = 7790,
    xml = 6063,
    html = 6033,
    aspx = 239187,
    cs = 117115,
    js = 119105,
    txt = 210187,
    sql = 255254
}

/// <summary>
/// 图片检测类
/// </summary>
public static class FileValidation
{
    #region 上传图片检测类
    /// <summary>
    /// 是否允许
    /// </summary>
    public static bool IsAllowedExtension(HttpPostedFile oFile, FileExtension[] fileEx)
    {
        int fileLen = oFile.ContentLength;
        byte[] imgArray = new byte[fileLen];
        oFile.InputStream.Read(imgArray, 0, fileLen);
        MemoryStream ms = new MemoryStream(imgArray);
        System.IO.BinaryReader br = new System.IO.BinaryReader(ms);
        string fileclass = "";
        byte buffer;
        try
        {
            buffer = br.ReadByte();
            fileclass = buffer.ToString();
            buffer = br.ReadByte();
            fileclass += buffer.ToString();
        }
        catch { }
        br.Close();
        ms.Close();
        foreach (FileExtension fe in fileEx)
        {
            if (Int32.Parse(fileclass) == (int)fe) return true;
        }
        return false;
    }

    /// <summary>
    /// 上传前的图片是否可靠
    /// </summary>
    public static bool IsSecureUploadPhoto(HttpPostedFile oFile)
    {
        bool isPhoto = false;
        string fileExtension = System.IO.Path.GetExtension(oFile.FileName).ToLower();
        string[] allowedExtensions = { ".gif", ".png", ".jpeg", ".jpg", ".bmp" };
        for (int i = 0; i < allowedExtensions.Length; i++)
        {
            if (fileExtension == allowedExtensions[i])
            {
                isPhoto = true;
                break;
            }
        }
        if (!isPhoto)
        {
            return true;
        }
        FileExtension[] fe = {FileExtension.BMP,FileExtension.GIF,FileExtension.JPG,FileExtension.PNG};

        if (IsAllowedExtension(oFile, fe))
            return true;
        else
            return false;
    }

    /// <summary>
    /// 上传后的图片是否安全
    /// </summary>
    /// <param name="photoFile">物理地址</param>
    public static bool IsSecureUpfilePhoto(string photoFile)
    {
        bool isPhoto = false;
        string Img = "Yes";
        string fileExtension = System.IO.Path.GetExtension(photoFile).ToLower();
        string[] allowedExtensions = { ".gif", ".png", ".jpeg", ".jpg", ".bmp" };
        for (int i = 0; i < allowedExtensions.Length; i++)
        {
            if (fileExtension == allowedExtensions[i])
            {
                isPhoto = true;
                break;
            }
        }

        if (!isPhoto)
        {
            return true;
        }
        StreamReader sr = new StreamReader(photoFile, System.Text.Encoding.Default);
        string strContent = sr.ReadToEnd();
        sr.Close();
        string str = "request|<script|.getfolder|.createfolder|.deletefolder|.createdirectory|.deletedirectory
|.saveas|wscript.shell|script.encode|server.|.createobject|execute|activexobject|language=";
        foreach (string s in str.Split(’|’))
        {
            if (strContent.ToLower().IndexOf(s) != -1)
            {
                File.Delete(photoFile);
                Img = "No";
                break;
            }
        }
        return (Img == "Yes");
    }
    #endregion
}

/// <summary>
/// 图片上传类
/// </summary>
//----------------调用-------------------
//imageUpload iu = new imageUpload();
//iu.AddText = "";
//iu.CopyIamgePath = "";
//iu.DrawString_x = ;
//iu.DrawString_y = ;
//iu.DrawStyle = ;
//iu.Font = "";
//iu.FontSize = ;
//iu.FormFile = File1;
//iu.IsCreateImg =;
//iu.IsDraw = ;
//iu.OutFileName = "";
//iu.OutThumbFileName = "";
//iu.SavePath = @"~/image/";
//iu.SaveType = ;
//iu.sHeight  = ;
//iu.sWidth   = ;
//iu.Upload();
//--------------------------------------
public class ImageUpload
{
    #region 私有成员
    private int _Error = 0;//返回上传状态。
    private int _MaxSize = 1024 * 1024;//最大单个上传文件 (默认)
    private string _FileType = "jpg;gif;bmp;png";//所支持的上传类型用"/"隔开
    private string _SavePath = System.Web.HttpContext.Current.Server.MapPath(".") + "\\";//保存文件的实际路径
    private int _SaveType = 0;//上传文件的类型,0代表自动生成文件名
    private HtmlInputFile _FormFile;//上传控件。
    private string _InFileName = "";//非自动生成文件名设置。
    private string _OutFileName = "";//输出文件名。
    private bool _IsCreateImg = true;//是否生成缩略图。
    private bool _Iss = false;//是否有缩略图生成.
    private int _Height = 0;//获取上传图片的高度
    private int _Width = 0;//获取上传图片的宽度
    private int _sHeight = 120;//设置生成缩略图的高度
    private int _sWidth = 120;//设置生成缩略图的宽度
    private bool _IsDraw = false;//设置是否加水印
    private int _DrawStyle = 0;//设置加水印的方式0:文字水印模式,1:图片水印模式,2:不加
    private int _DrawString_x = 10;//绘制文本的X坐标(左上角)
    private int _DrawString_y = 10;//绘制文本的Y坐标(左上角)
    private string _AddText = "GlobalNatureCrafts";//设置水印内容
    private string _Font = "宋体";//设置水印字体
    private int _FontSize = 12;//设置水印字大小
    private int _FileSize = 0;//获取已经上传文件的大小
    private string _CopyIamgePath = System.Web.HttpContext.Current.Server.MapPath(".") + "/images/5dm_new.jpg";//图片水印模式下的覆盖图片的实际地址
    #endregion

    #region 公有属性
    /// <summary>
    /// Error返回值
    /// 1、没有上传的文件
    /// 2、类型不允许
    /// 3、大小超限
    /// 4、未知错误
    /// 0、上传成功。
    /// </summary>
    public int Error
    {
        get { return _Error; }
    }

    /// <summary>
    /// 最大单个上传文件
    /// </summary>
    public int MaxSize
    {
        set { _MaxSize = value; }
    }

    /// <summary>
    /// 所支持的上传类型用";"隔开
    /// </summary>
    public string FileType
    {
        set { _FileType = value; }
    }

    /// <summary>
    /// 保存文件的实际路径
    /// </summary>
    public string SavePath
    {
        set { _SavePath = System.Web.HttpContext.Current.Server.MapPath(value); }
        get { return _SavePath; }
    }

    /// <summary>
    /// 上传文件的类型,0代表自动生成文件名
    /// </summary>
    public int SaveType
    {
        set { _SaveType = value; }
    }

    /// <summary>
    /// 上传控件
    /// </summary>
    public HtmlInputFile FormFile
    {
        set { _FormFile = value; }
    }

    /// <summary>
    /// 非自动生成文件名设置。
    /// </summary>
    public string InFileName
    {
        set { _InFileName = value; }
    }

    /// <summary>
    /// 输出文件名
    /// </summary>
    public string OutFileName
    {
        get { return _OutFileName; }
        set { _OutFileName = value; }
    }

    /// <summary>
    /// 输出的缩略图文件名
    /// </summary>
    public string OutThumbFileName
    {
        get;
        set;
    }

    /// <summary>
    /// 是否有缩略图生成.
    /// </summary>
    public bool Iss
    {
        get { return _Iss; }
    }

    /// <summary>
    /// 获取上传图片的宽度
    /// </summary>
    public int Width
    {
        get { return _Width; }
    }

    /// <summary>
    /// 获取上传图片的高度
    /// </summary>
    public int Height
    {
        get { return _Height; }
    }

    /// <summary>
    /// 设置缩略图的宽度
    /// </summary>
    public int sWidth
    {
        get { return _sWidth; }
        set { _sWidth = value; }
    }

    /// <summary>
    /// 设置缩略图的高度
    /// </summary>
    public int sHeight
    {
        get { return _sHeight; }
        set { _sHeight = value; }
    }

    /// <summary>
    /// 是否生成缩略图
    /// </summary>
    public bool IsCreateImg
    {
        get { return _IsCreateImg; }
        set { _IsCreateImg = value; }
    }

    /// <summary>
    /// 是否加水印
    /// </summary>
    public bool IsDraw
    {
        get { return _IsDraw; }
        set { _IsDraw = value; }
    }

    /// <summary>
    /// 设置加水印的方式
    /// 0:文字水印模式
    /// 1:图片水印模式
    /// 2:不加
    /// </summary>
    public int DrawStyle
    {
        get { return _DrawStyle; }
        set { _DrawStyle = value; }
    }

    /// <summary>
    /// 绘制文本的X坐标(左上角)
    /// </summary>
    public int DrawString_x
    {
        get { return _DrawString_x; }
        set { _DrawString_x = value; }
    }

    /// <summary>
    /// 绘制文本的Y坐标(左上角)
    /// </summary>
    public int DrawString_y
    {
        get { return _DrawString_y; }
        set { _DrawString_y = value; }
    }

    /// <summary>
    /// 设置文字水印内容
    /// </summary>
    public string AddText
    {
        get { return _AddText; }
        set { _AddText = value; }
    }

    /// <summary>
    /// 设置文字水印字体
    /// </summary>
    public string Font
    {
        get { return _Font; }
        set { _Font = value; }
    }

    /// <summary>
    /// 设置文字水印字的大小
    /// </summary>
    public int FontSize
    {
        get { return _FontSize; }
        set { _FontSize = value; }
    }

    /// <summary>
    /// 文件大小
    /// </summary>
    public int FileSize
    {
        get { return _FileSize; }
        set { _FileSize = value; }
    }

    /// <summary>
    /// 图片水印模式下的覆盖图片的实际地址
    /// </summary>
    public string CopyIamgePath
    {
        set { _CopyIamgePath = System.Web.HttpContext.Current.Server.MapPath(value); }
    }

    #endregion

    #region 私有方法
    /// <summary>
    /// 获取文件的后缀名
    /// </summary>
    private string GetExt(string path)
    {
        return Path.GetExtension(path);
    }

    /// <summary>
    /// 获取输出文件的文件名
    /// </summary>
    private string FileName(string Ext)
    {
        if (_SaveType == 0 || _InFileName.Trim() == "")
            return DateTime.Now.ToString("yyyyMMddHHmmssfff") + Ext;
        else
            return _InFileName;
    }

    /// <summary>
    /// 检查上传的文件的类型,是否允许上传。
    /// </summary>
    private bool IsUpload(string Ext)
    {
        Ext = Ext.Replace(".", "");
        bool b = false;
        string[] arrFileType = _FileType.Split(’;’);
        foreach (string str in arrFileType)
        {
            if (str.ToLower() == Ext.ToLower())
            {
                b = true;
                break;
            }
        }
        return b;
    }
    #endregion

    #region 上传图片
    public void Upload()
    {
        HttpPostedFile hpFile = _FormFile.PostedFile;
        if (hpFile == null || hpFile.FileName.Trim() == "")
        {
            _Error = 1;
            return;
        }
        string Ext = GetExt(hpFile.FileName);
        if (!IsUpload(Ext))
        {
            _Error = 2;
            return;
        }
        int iLen = hpFile.ContentLength;
        if (iLen > _MaxSize)
        {
            _Error = 3;
            return;
        }
        try
        {
            if (!Directory.Exists(_SavePath)) Directory.CreateDirectory(_SavePath);
            byte[] bData = new byte[iLen];
            hpFile.InputStream.Read(bData, 0, iLen);
            string FName;
            FName = FileName(Ext);
            string TempFile = "";
            if (_IsDraw)
            {
                TempFile = FName.Split(’.’).GetValue(0).ToString() + "_temp." + FName.Split(’.’).GetValue(1).ToString();
            }
            else
            {
                TempFile = FName;
            }
            FileStream newFile = new FileStream(_SavePath + TempFile, FileMode.Create);
            newFile.Write(bData, 0, bData.Length);
            newFile.Flush();
            int _FileSizeTemp = hpFile.ContentLength;

            string ImageFilePath = _SavePath + FName;
            if (_IsDraw)
            {
                if (_DrawStyle == 0)
                {
                    System.Drawing.Image Img1 = System.Drawing.Image.FromStream(newFile);
                    Graphics g = Graphics.FromImage(Img1);
                    g.DrawImage(Img1, 100, 100, Img1.Width, Img1.Height);
                    Font f = new Font(_Font, _FontSize);
                    Brush b = new SolidBrush(Color.Red);
                    string addtext = _AddText;
                    g.DrawString(addtext, f, b, _DrawString_x, _DrawString_y);
                    g.Dispose();
                    Img1.Save(ImageFilePath);
                    Img1.Dispose();
                }
                else
                {
                    System.Drawing.Image image = System.Drawing.Image.FromStream(newFile);
                    System.Drawing.Image copyImage = System.Drawing.Image.FromFile(_CopyIamgePath);
                    Graphics g = Graphics.FromImage(image);
                    g.DrawImage(copyImage, new Rectangle(image.Width - copyImage.Width - 5, image.Height - copyImage.Height - 5, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
                    g.Dispose();
                    image.Save(ImageFilePath);
                    image.Dispose();
                }
            }

            //获取图片的高度和宽度
            System.Drawing.Image Img = System.Drawing.Image.FromStream(newFile);
            _Width = Img.Width;
            _Height = Img.Height;

            //生成缩略图部分
            if (_IsCreateImg)
            {
                #region 缩略图大小只设置了最大范围,并不是实际大小
                float realbili = (float)_Width / (float)_Height;
                float wishbili = (float)_sWidth / (float)_sHeight;

                //实际图比缩略图最大尺寸更宽矮,以宽为准
                if (realbili > wishbili)
                {
                    _sHeight = (int)((float)_sWidth / realbili);
                }
                //实际图比缩略图最大尺寸更高长,以高为准
                else
                {
                    _sWidth = (int)((float)_sHeight * realbili);
                }
                #endregion

                this.OutThumbFileName = FName.Split(’.’).GetValue(0).ToString() + "_s." + FName.Split(’.’).GetValue(1).ToString();
                string ImgFilePath = _SavePath + this.OutThumbFileName;

                System.Drawing.Image newImg = Img.GetThumbnailImage(_sWidth, _sHeight, null, System.IntPtr.Zero);
                newImg.Save(ImgFilePath);
                newImg.Dispose();
                _Iss = true;
            }

            if (_IsDraw)
            {
                if (File.Exists(_SavePath + FName.Split(’.’).GetValue(0).ToString() + "_temp." + FName.Split(’.’).GetValue(1).ToString()))
                {
                    newFile.Dispose();
                    File.Delete(_SavePath + FName.Split(’.’).GetValue(0).ToString() + "_temp." + FName.Split(’.’).GetValue(1).ToString());
                }
            }
            newFile.Close();
            newFile.Dispose();
            _OutFileName = FName;
            _FileSize = _FileSizeTemp;
            _Error = 0;
            return;
        }
        catch (Exception ex)
        {
            _Error = 4;
            return;
        }
    }
    #endregion
}
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