Asp.net 文件上传基类代码,Asp.Net代码库,德仔网

代码语言
代码分类
【Asp.Net】 Asp.net 文件上传基类
作者:dezai / 发布于2014/4/21/ 535
Asp.net 文件上传基类(取得文件后缀名,保存文件,加入文字水印)
using System;
using System.Data;
using System.Configuration;
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 System.Drawing;
using System.IO;
using System.Drawing.Imaging;

namespace EC
{
  /// <summary>
  /// 上传类
  /// </summary>
  public class UploadObj
  {

    public UploadObj()
    {
      //
      // TODO: 在此处添加构造函数逻辑
      //
    }
    /// <summary>
    /// 允许文件上传的类型枚举
    /// </summary>
    public enum FileType
    {
     jpg,gif,bmp,png      
    }

    #region 取得文件后缀
    /// <summary>
    /// 取得文件后缀
    /// </summary>
    /// <param name="filename">文件名称</param>
    /// <returns></returns>
    public static string GetFileExtends(string filename)
    {
      string ext = null;
      if (filename.IndexOf('.') > 0)
      {
        string[] fs = filename.Split('.');
        ext = fs[fs.Length - 1];
      }
      return ext;
    }
    #endregion

    #region 检测文件是否合法
    /// <summary>
    /// 检测上传文件是否合法
    /// </summary>
    /// <param name="fileExtends">文件后缀名</param>
    /// <returns></returns>
    public static bool CheckFileExtends(string fileExtends)
    {
      bool status = false;
      fileExtends = fileExtends.ToLower();
      string[] fe = Enum.GetNames(typeof(FileType));
      for (int i = 0; i < fe.Length; i++)
      {
        if (fe[i].ToLower() == fileExtends)
        {
          status = true;
          break;
        }
      }
      return status;
    }
    #endregion

    #region 保存文件
   /// <summary>
   /// 保存文件
   /// </summary>
   /// <param name="fpath">全路径,Server.MapPath()</param>
   /// <param name="myFileUpload">上传控件</param>
   /// <returns></returns>
    public static string PhotoSave(string fpath,FileUpload myFileUpload)
    { 
      string s = "";
      string fileExtends = "";
      string fileName = myFileUpload.FileName;
      if (fileName != "")
      {
        //取得文件后缀
        fileExtends = EC.UploadObj.GetFileExtends(fileName);
        if (!EC.UploadObj.CheckFileExtends(fileExtends))
        {
          EC.MessageObject.ShowPre("上传文件类型不合法");         
        }
        Random rd = new Random();
        s = EC.RandomObject.DateRndName(rd) + "." + fileExtends;
        string file = fpath + "/" + s;
        try
        {
          myFileUpload.SaveAs(file);
        }
        catch (Exception ee)
        {
          throw new Exception(ee.ToString());
        }
      }
      return s;
    }

    #endregion

    #region 加入文字水印

    /// <summary>
    /// 加入文字水印
    /// </summary>
    /// <param name="fileName">文件名称路径(全路径)</param>
    /// <param name="text">文件</param>
    public void AddTextToImg(string fileName, string text)
    {
      if (!File.Exists(fileName))
      {
        throw new FileNotFoundException("文件不存在");
      }
      if (text == string.Empty)
      {
        return;
      }
      //判断文件类型是否为图像类型

      System.Drawing.Image image = System.Drawing.Image.FromFile(fileName);
      Bitmap bitmap = new Bitmap(image, image.Width, image.Height);
      Graphics g = Graphics.FromImage(bitmap);
      float fontSize = 12.0f;//字体大小
      float textWidth = text.Length * fontSize;//文本的长度
      //下面定义一个矩形区域,以后在这个矩形里面画上白底黑字
      float rectX = 0;
      float rectY = 0;
      float rectWidth = text.Length * (fontSize + 8);
      float rectHeight = fontSize + 8;
      //声明矩形域
      RectangleF textArea = new RectangleF(rectX, rectY, rectWidth, rectHeight);
      Font font = new Font("宋体", fontSize);//定义字体
      Brush whiteBrush = new SolidBrush(Color.White);//白笔刷,画文字用
      Brush blackBrush = new SolidBrush(Color.Black);//黑笔刷，画背景用
      g.FillRectangle(blackBrush, rectX, rectY, rectWidth, rectHeight);
      g.DrawString(text, font, whiteBrush, textArea);
      MemoryStream ms = new MemoryStream();
      bitmap.Save(ms, ImageFormat.Jpeg);
      //输出处理后的图像，这里为了演示方便，我将图片显示在页面中了
      //Response.Clear();
      //Response.ContentType = "image/jpeg";
      //Response.BinaryWrite(ms.ToArray());
      g.Dispose();
      bitmap.Dispose();
      image.Dispose();    
    }
    #endregion
  }
}
试试其它关键字
　文件上传　
同语言下
可能有用的
dezai贡献的其它代码(1065)