asp.net文件上传功能(单文件，多文件,自定义生成缩略图,水印)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
namespace CCNF.Plugin.Upload
{
/// summary>
/// 上传功能的接口
/// /summary>
/// creator>Marc/creator>
public interface IUpload
{
/// summary>
/// 上传单个文件。
/// /summary>
/// param name="sourcefile">/param>
/// returns>/returns>
/// author>Marc/author>
int SaveAs(HttpPostedFile sourcefile);
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.IO;
using System.Net;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Web;
using System.Collections;
namespace CCNF.Plugin.Upload
{
/// summary>
/// 上传功能。
/// 本类提供上传的一般性方法。
/// /summary>
/// creator>Marc/creator>
public abstract class UploadAbstract : IUpload
{
#region 常量属性
/// summary>
/// 允许上传的文件扩展名。
/// 多个文件扩展名以英文逗号隔开。
/// 默认从Web.config中获取。
/// /summary>
private readonly string UPLOADEXTENTION = ConfigurationManager.AppSettings["UploadExtention"];
private string uploadExtention = null;
/// summary>
/// 允许上传的文件扩展名。
/// 多个文件扩展名以英文逗号隔开。
/// 默认从Web.config中获取。
/// /summary>
public string UploadExtention
{
get
{
if (string.IsNullOrEmpty(this.uploadExtention))
{
if (string.IsNullOrEmpty(UPLOADEXTENTION))
{
throw new Exception("web.config中未配置UploadExtention属性");
}
this.uploadExtention = UPLOADEXTENTION;
}
return this.uploadExtention;
}
set
{
this.uploadExtention = value;
}
}
/// summary>
/// 允许上传的单个文件最大大小。
/// 单位为k。
/// 默认从Web.config中获取。
/// /summary>
private readonly int UPLOADLENGTH = Convert.ToInt16(ConfigurationManager.AppSettings["UploadLength"]);
private int uploadLength = 0;
/// summary>
/// 允许上传的单个文件最大大小。
/// 单位为。
/// 默认从Web.config中获取。
/// /summary>
public int UploadLength
{
get
{
if (this.uploadLength == 0)
{
this.uploadLength = UPLOADLENGTH;
}
return this.uploadLength;
}
set
{
this.uploadLength = value;
}
}
/// summary>
/// 所上传的文件要保存到哪个物理盘上。
/// 此值为严格的物理文件夹路径。如：E:\CCNF\
/// 注意：必须有盘符。
/// 此属于用于扩展图片服务器数据存储。
/// 默认从Web.config中获取。
/// /summary>
private readonly string UPLOADPHYSICALPATH = ConfigurationManager.AppSettings["UploadPhysicalPath"];
private string uploadPhysicalPath = null;
/// summary>
/// 所上传的文件要保存到哪个物理盘上。
/// 此值为严格的物理文件夹路径。如：E:\CCNF\
/// 注意：必须有盘符。
/// 此属性用于扩展图片服务器数据存储。
/// 默认从Web.config中获取。
/// /summary>
public string UploadPhysicalPath
{
get
{
if (string.IsNullOrEmpty(this.uploadPhysicalPath))
{
if (string.IsNullOrEmpty(UPLOADPHYSICALPATH))
{
throw new Exception("web.config中未配置UploadPhysicalPath属性");
}
this.uploadPhysicalPath = UPLOADPHYSICALPATH;
}
return this.uploadPhysicalPath;
}
set
{
this.uploadPhysicalPath = value;
}
}
#endregion
#region 枚举
/// summary>
/// 水印类型
/// /summary>
public enum WatermarkTypeEnum
{
/// summary>
/// 文字水印
/// /summary>
String = 1,
/// summary>
/// 图片水印
/// /summary>
Image = 2
}
/// summary>
/// 上传结果
/// /summary>
protected enum UploadResultEnum
{
/// summary>
/// 未指定要上传的对象
/// /summary>
UploadedObjectIsNull = -9,
/// summary>
/// 文件扩展名不允许
/// /summary>
ExtentionIsNotAllowed = -2,
/// summary>
/// 文件大小不在限定范围内
/// /summary>
ContentLengthNotWithinTheScope = -1,
/// summary>
/// 未配置或未指定文件的物理保存路径
/// /summary>
UploadPhysicalPathNoSpecify = -20,
/// summary>
/// 未指定图片水印的相对文件物理路径
/// /summary>
ImageWartermarkPathNoSpecify = -30,
/// summary>
/// 未指定水印的文字
/// /summary>
StringWatermarkNoSpecify = -31,
/// summary>
/// 上传原始文件失败
/// /summary>
UploadOriginalFileFailure = 0,
/// summary>
/// 生成缩略失败
/// /summary>
CreateThumbnailImageFailure = -3,
/// summary>
/// 未知错误
/// /summary>
UnknownError = -4,
/// summary>
/// 上传成功
/// /summary>
Success = 1
}
#endregion
#region 上传属性
/// summary>
/// 保存文件夹。
/// 格式形如： upload\ 或 images\ 或 upload\user\ 等。以\结尾。
/// 不允许加盘符
/// /summary>
public string SaveFolder { get; set; }
/// summary>
/// 自定义生成新的文件夹。
/// 格式形如： upload\ 或 images\ 或 upload\2011\10\8\ 等。以\结尾。
/// 最终的文件夹 = UploadPhysicalPath + SaveFolder + Folder
/// /summary>
public string Folder { get; set; }
/// summary>
/// 是否生成水印。
/// 默认不启用水印生成。
/// /summary>
public bool IsMakeWatermark { get; set; }
private int watermarkType = (int)WatermarkTypeEnum.String;
/// summary>
/// 生成水印的方式：string从文字生成，image从图片生成。
/// 默认是文字水印
/// /summary>
public int WatermarkType
{
get
{
return this.watermarkType;
}
set
{
this.watermarkType = value;
}
}
/// summary>
/// 水印文字。
/// /summary>
public string Watermark { get; set; }
/// summary>
/// 水印图片的位置。
/// 提供图片水印的相对位置。
/// 不含盘符。
/// /summary>
public string ImageWartermarkPath { get; set; }
/// summary>
/// 上传后生成的新文件路径。
/// 此路径为相对物理路径，不含盘符。
/// /summary>
public string NewFilePath { get; protected set; }
/// summary>
/// 生成缩略图片的长宽， 是一个二维数据。　
/// 如：int a[3,2]={{1,2},{5,6},{9,10}}。
/// 如果上传的文件是图片类型，并且希望生成此图片的缩略图，那么请将需要生成的长宽尺寸以数组的方式保存到这里。
/// /summary>
public int[,] PicSize { get; set; }
/// summary>
/// 生成的图片地址，与二维数组PicSize的长度是对应的。
/// 如果有传入PicSize的数组，那么上传完毕后，系统会返回PicPath数组。
/// 这个数组是它的最终上传路径，以便用户对此值进行数据库操作。
/// 产生的PicPath的索引位置与PicSize是一一对应的。
/// 此属性已声明为只读属性。
/// /summary>
public string[] PicPath { get; protected set; }
#endregion
/// summary>
/// 上传单个文件
/// /summary>
/// param name="sourcefile">/param>
/// param name="upload">/param>
/// returns>/returns>
/// author>Marc/author>
public virtual int SaveAs(HttpPostedFile sourcefile)
{
int result = 0;
//未知错误
UploadResultEnum uploadResultEnum = UploadResultEnum.UnknownError;
if (sourcefile == null)
{
//未指定要上传的对象
uploadResultEnum = UploadResultEnum.UploadedObjectIsNull;
}
else
{
uploadResultEnum = Upload(sourcefile);
}
result = (int)uploadResultEnum;
return result;
}
/// summary>
/// 上传文件
/// /summary>
/// param name="sourcefile">/param>
/// returns>/returns>
/// author>Marc/author>
private UploadResultEnum Upload(HttpPostedFile sourcefile)
{
#region 上传前检测
if (string.IsNullOrEmpty(UploadPhysicalPath))
{
//未配置或未指定文件的物理保存路径
return UploadResultEnum.UploadPhysicalPathNoSpecify;
}
string fileName = sourcefile.FileName;
string fileExtention = Path.GetExtension(fileName);
if (!CheckExtention(fileExtention))
{
//文件扩展名不允许
return UploadResultEnum.ExtentionIsNotAllowed;
}
int fileLength = sourcefile.ContentLength;
if (fileLength = 0 || fileLength > UploadLength * 1024)
{
//文件大小不在限定范围内
return UploadResultEnum.ContentLengthNotWithinTheScope;
}
//创建要保存的文件夹
string physicalPath = UploadPhysicalPath + SaveFolder + Folder;
if (!Directory.Exists(physicalPath))
{
Directory.CreateDirectory(physicalPath);
}
#endregion
string newFileName = "Ori_" + Guid.NewGuid().ToString() + fileExtention;
//新文件相对物理路径
string newFilePath = physicalPath + newFileName;
#region 保存原始文件
if (!IsMakeWatermark) //不启用水印时
{
//保存文件
sourcefile.SaveAs(newFilePath);
}
else //要求生成水印
{
Image bitmap = new System.Drawing.Bitmap(sourcefile.InputStream);
Graphics g = Graphics.FromImage(bitmap);
g.InterpolationMode = InterpolationMode.High;
g.SmoothingMode = SmoothingMode.AntiAlias;
Image fromImg = null;
try
{
//清除整个绘图面并以透明背景色填充
//g.Clear(Color.Transparent);
if (WatermarkType == (int)WatermarkTypeEnum.String) //生成文字水印
{
if (string.IsNullOrEmpty(Watermark))
{
//未指定水印的文字
return UploadResultEnum.StringWatermarkNoSpecify;
}
Color color = Color.FromArgb(120, 255, 255, 255);
Brush brush = new SolidBrush(color);
// 自动根据界面来缩放字体大小
int desiredWidth = (int)(bitmap.Width * .5);
Font font = new Font("Arial", 16, FontStyle.Regular);
SizeF stringSizeF = g.MeasureString(Watermark, font);
float Ratio = stringSizeF.Width / font.SizeInPoints;
int requiredFontSize = (int)(desiredWidth / Ratio);
// 计算图片中点位置
Font requiredFont = new Font("Arial", requiredFontSize, FontStyle.Bold);
stringSizeF = g.MeasureString(Watermark, requiredFont);
int x = desiredWidth - (int)(stringSizeF.Width / 2);
int y = (int)(bitmap.Height * .5) - (int)(stringSizeF.Height / 2);
g.DrawString(Watermark, new Font("Verdana", requiredFontSize, FontStyle.Bold), brush, new Point(x, y));
bitmap.Save(newFilePath, ImageFormat.Jpeg);
}
else if (WatermarkType == (int)WatermarkTypeEnum.Image) //生成图片水印
{
if (string.IsNullOrEmpty(ImageWartermarkPath))
{
//未指定图片水印的相对文件物理路径
return UploadResultEnum.ImageWartermarkPathNoSpecify;
}
fromImg = Image.FromFile(ImageWartermarkPath);
g.DrawImage(fromImg, new Rectangle(bitmap.Width - fromImg.Width, bitmap.Height - fromImg.Height, fromImg.Width, fromImg.Height), 0, 0, fromImg.Width, fromImg.Height, GraphicsUnit.Pixel);
bitmap.Save(newFilePath, ImageFormat.Jpeg);
}
}
catch
{
//上传原始文件失败
return UploadResultEnum.UploadOriginalFileFailure;
}
finally
{
if (fromImg != null)
{
fromImg.Dispose();
}
g.Dispose();
bitmap.Dispose();
}
}
#endregion
this.NewFilePath = newFilePath.Replace("\\", "/");
#region 生成各种规格的缩略图
//生成各种规格的缩略图
if (PicSize != null PicSize.Length > 0)
{
int width, height;
ArrayList picPathArray = new ArrayList();
for (int i = 0; i PicSize.GetLength(0); i++)
{
width = PicSize[i, 0];
height = PicSize[i, 1];
Guid tempGuid = Guid.NewGuid();
//缩略图名称
string thumbnailFileName = physicalPath + tempGuid.ToString() + "_" + width.ToString() + "X" + height.ToString() + fileExtention;
if (!SaveThumb(sourcefile, width, height, thumbnailFileName))
{
//生成缩略失败
return UploadResultEnum.CreateThumbnailImageFailure;
}
picPathArray.Add(thumbnailFileName.Replace("\\", "/"));
}
PicPath = (string[])picPathArray.ToArray(typeof(string));
}
#endregion
//上传成功
return UploadResultEnum.Success;
}
/// summary>
/// 生成缩略图
/// /summary>
/// param name="sourcefile">/param>
/// param name="width">生成缩略图的宽度/param>
/// param name="height">生成缩略图的高度/param>
/// param name="thumbnailFileName">缩略图生成路径，含盘符的绝对物理路径。/param>
/// returns>/returns>
/// author>Marc/author>
private bool SaveThumb(HttpPostedFile sourcefile, int width, int height, string thumbnailFileName)
{
bool result = false;
Image ori_img = Image.FromStream(sourcefile.InputStream);
int ori_width = ori_img.Width;//650
int ori_height = ori_img.Height;//950
int new_width = width;//700
int new_height = height;//700
// 在此进行等比例判断,公式如下：
if (new_width > ori_width)
{
new_width = ori_width;
}
if (new_height > ori_height)
{
new_height = ori_height;
}
if ((double)ori_width / (double)ori_height > (double)new_width / (double)new_height)
{
new_height = ori_height * new_width / ori_width;
}
else
{
new_width = ori_width * new_height / ori_height;
}
Image bitmap = new System.Drawing.Bitmap(new_width, new_height);
Graphics g = Graphics.FromImage(bitmap);
try
{
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.High;
g.Clear(System.Drawing.Color.Transparent);
g.DrawImage(ori_img, new Rectangle(0, 0, new_width, new_height), new Rectangle(0, 0, ori_width, ori_height), GraphicsUnit.Pixel);
bitmap.Save(thumbnailFileName, ImageFormat.Jpeg);
result = true;
}
catch
{
result = false;
}
finally
{
if (ori_img != null)
{
ori_img.Dispose();
}
if (bitmap != null)
{
bitmap.Dispose();
}
g.Dispose();
bitmap.Dispose();
}
return result;
}
/// summary>
/// 检查文件扩展名
/// /summary>
/// param name="extention">/param>
/// returns>/returns>
protected bool CheckExtention(string extention)
{
bool b = false;
string[] extentions = this.UploadExtention.Split(',');
for (int i = 0; i extentions.Length; i++)
{
if (extention.ToLower() == extentions[i].ToLower())
{
b = true;
break;
}
}
return b;
}
/// summary>
/// 返回上传结果
/// /summary>
/// param name="result">消息集合/param>
/// returns>/returns>
/// author>marc/author>
public string Error(int[] result)
{
string s = "";
for (int i = 0; i result.Length; i++)
{
s += "第" + (i + 1).ToString() + "张:";
if (result[i] != 1)
{
switch (result[i])
{
case (int)UploadResultEnum.UploadedObjectIsNull:
s += "未指定要上传的对象";
break;
case (int)UploadResultEnum.ExtentionIsNotAllowed:
s += "文件扩展名不允许";
break;
case (int)UploadResultEnum.ContentLengthNotWithinTheScope:
s += "文件大小不在限定范围内";
break;
case (int)UploadResultEnum.UploadPhysicalPathNoSpecify:
s += "未配置或未指定文件的物理保存路径";
break;
case (int)UploadResultEnum.ImageWartermarkPathNoSpecify:
s += "未指定图片水印的相对文件物理路径";
break;
case (int)UploadResultEnum.StringWatermarkNoSpecify:
s += "未指定水印的文字";
break;
case (int)UploadResultEnum.UploadOriginalFileFailure:
s += "上传原始文件失败";
break;
case (int)UploadResultEnum.CreateThumbnailImageFailure:
s += "生成缩略失败";
break;
case (int)UploadResultEnum.UnknownError:
s += "未知错误";
break;
default:
break;
}
}
else
{
s += "上传成功";
}
s += ";\\r\\n";
}
return s;
}
/// summary>
/// 返回上传结果
/// /summary>
/// param name="result">消息值,int型/param>
/// returns>/returns>
/// author>marc/author>
public string Error(int result)
{
string s = null;
switch (result)
{
case (int)UploadResultEnum.UploadedObjectIsNull:
s += "未指定要上传的对象";
break;
case (int)UploadResultEnum.ExtentionIsNotAllowed:
s += "文件扩展名不允许";
break;
case (int)UploadResultEnum.ContentLengthNotWithinTheScope:
s += "文件大小不在限定范围内";
break;
case (int)UploadResultEnum.UploadPhysicalPathNoSpecify:
s += "未配置或未指定文件的物理保存路径";
break;
case (int)UploadResultEnum.ImageWartermarkPathNoSpecify:
s += "未指定图片水印的相对文件物理路径";
break;
case (int)UploadResultEnum.StringWatermarkNoSpecify:
s += "未指定水印的文字";
break;
case (int)UploadResultEnum.UploadOriginalFileFailure:
s += "上传原始文件失败";
break;
case (int)UploadResultEnum.CreateThumbnailImageFailure:
s += "生成缩略失败";
break;
case (int)UploadResultEnum.UnknownError:
s += "未知错误";
break;
case (int)UploadResultEnum.Success:
s += "上传成功";
break;
default:
break;
}
return s;
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
namespace CCNF.Plugin.Upload
{
/// summary>
/// 上传文件
/// /summary>
/// creator>Marc/creator>
public sealed class Upload : UploadAbstract
{
}
}

%@ WebHandler Language="C#" Class="Upload" %>
using System;
using System.Web;
using System.IO;
public class Upload : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
HttpResponse response = context.Response;
HttpRequest request = context.Request;
HttpServerUtility server = context.Server;
context.Response.ContentType = "text/plain";
HttpPostedFile httpPostedFile = request.Files["FileData"];
string uploadpath = request["folder"] + "\\";// server.MapPath(request["folder"] + "\\");
if (httpPostedFile != null)
{
CCNF.Plugin.Upload.Upload upload = new CCNF.Plugin.Upload.Upload();
upload.SaveFolder = uploadpath;
upload.PicSize = new int[,] { { 200, 150 } };//生成缩略图，要生成哪些尺寸规格的缩略图，请自行定义二维数组
int result = upload.SaveAs(httpPostedFile);
if (result == 1)
{
context.Response.Write("1");
}
else
{
throw new Exception(upload.Error(result));
// context.Response.Write("0");
}
}
}
public bool IsReusable
{
get
{
return false;
}
}
}