Asp.net 文件上传类(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 
} 
} 

以上就是Asp.net 文件上传类(取得文件后缀名,保存文件,加入文字水印)。谋人事，成天命！更多关于Asp.net 文件上传类(取得文件后缀名,保存文件,加入文字水印)请关注haodaima.com其它相关文章！