1 <%@ WebHandler Language="C#" Class="UpLoadFile" %>

  2

  3 using System;

  4 using System.Collections;

  5 using System.Collections.Generic;

  6 using System.Drawing;

  7 using System.Drawing.Drawing2D;

  8 using System.Threading;

  9 using System.Web;

 10 using System.Web.Mvc;

 11 using System.Web.Script.Serialization;

 12 using System.IO;

 13

 14 /// <summary>

 15 /// UpLoadHandler 的摘要说明

 16 /// </summary>

 17 public class UpLoadFile : IHttpHandler

 18 {

 19     //文件上传目录

 20     private string uploadFolder = "/UserImages/";

 21     //定义允许上传的文件扩展名

 22     private String fileTypes = "jpg,gif,jpeg,png,doc,pdf,html,htm";

 23     //最大文件大小 1MB=1000000byte

 24     private int maxSize = 20000000;

 25

 26     public void ProcessRequest(HttpContext context)

 27     {

 28         UpLoadData data = new UpLoadData();

 29         //context.Response.ContentType = "text/plain";

 30

 31         HttpFileCollection files = context.Request.Files;

 32         try

 33         {

 34             if (files.Count <= 0 || files[0] == null)

 35             {

 36                 ReturnError(context, "请选择文件。");

 37             }

 38

 39             HttpPostedFile file = files[0];

 40

 41             if (file.InputStream == null || file.InputStream.Length > maxSize)

 42             {

 43                 ReturnError(context, "上传文件大小超过限制。");

 44             }

 45

 46             string fileExt = System.IO.Path.GetExtension(file.FileName).ToLower();

 47             ArrayList fileTypeList = ArrayList.Adapter(fileTypes.Split(','));

 48             if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(fileTypes.Split(','), fileExt.Substring(1).ToLower()) == -1)

 49             {

 50                 ReturnError(context, "上传文件扩展名是不允许的扩展名。");

 51             }

 52

 53             //添加新文件

 54             string fileName = GetDateTimeNO().ToString();

 55             string folderName = context.Request.QueryString["folderName"];

 56             string dateName = DateTime.Now.ToString("yyyy-MM-dd");

 57             String dirPath = context.Server.MapPath("\\UserImages\\" + folderName + "\\" + dateName + "\\");

 58             if (!Directory.Exists(dirPath))

 59             {

 60                 Directory.CreateDirectory(dirPath);

 61             }

 62             string path = context.Server.MapPath(uploadFolder) + folderName + "\\" + dateName + "\\";

 63             string fileFullName = fileName + fileExt;

 64             string savePath = path + fileFullName;

 65             file.SaveAs(savePath);

 66

 67             Image image = Image.FromFile(savePath);

 68

 69

 70

 71             switch (folderName)

 72             {

 73                 case "Reports":

 74                     Image img = Thumbnail(image, 188, 140);

 75

 76                     img.Save(path + "/S_" + fileFullName);

 77

 78                     image.Dispose();

 79                     break;

 80                 case "Activity":

 81                     Image img2 = Thumbnail(image, 360, 270);

 82

 83                     img2.Save(path + "/S_" + fileFullName);

 84

 85                     image.Dispose();

 86                     break;

 87

 88                 case "ActivityBrend":

 89                     Image img3 = Thumbnail(image, 280, 266);

 90

 91                     img3.Save(path + "/S_" + fileFullName);

 92

 93                     image.Dispose();

 94                     break;

 95

 96                 case "ReleaseCars":

 97                     Image img4 = Thumbnail(image, 280, 266);

 98

 99                     img4.Save(path + "/S_" + fileFullName);

100

101                     image.Dispose();

102                     break;

103

104             }

105             data.FileName = dateName + "/" + fileName + fileExt;

106             data.FileUrl = uploadFolder + folderName + "/" + dateName + "/" + fileName + fileExt;

107         }

108         catch (Exception e)

109         {

110             data.Error = e.Message;

111         }

112         context.Response.Write(new JavaScriptSerializer().Serialize(data));

113         context.Response.End();

114     }

115

116     private void DeleteFile(HttpContext context, string fileName)

117     {

118         String delFilePath = context.Server.MapPath(fileName);

119         if (File.Exists(delFilePath))

120         {

121             new FileInfo(delFilePath).Delete();

122         }

123     }

124

125     private void ReturnError(HttpContext context, string error)

126     {

127         UpLoadData data = new UpLoadData();

128         data.Error = error;

129         context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8");

130         context.Response.Write(new JavaScriptSerializer().Serialize(data));

131         context.Response.End();

132     }

133

134     #region 按日期时间生成编号

135     /// <summary>

136     /// 按日期生成编号

137     /// </summary>

138     /// <param name="num">位数(默认18位)</param>

139     /// <returns>编号</returns>

140     public long GetDateTimeNO(int num = 18)

141     {

142         if (num > 20) num = 20;

143         string formatbase = "yyyyMMddhhmmssffffff";

144         Thread.Sleep(1);

145         return long.Parse((DateTime.Now.ToString(formatbase)).Substring(0, num));

146     }

147     /// <summary>

148     /// 按日期生成编号(后4位根据种子)

149     /// </summary>

150     /// <param name="rand">种子</param>

151     /// <param name="num">位数(默认18位)</param>

152     /// <returns>编号</returns>

153     public long GetDateTimeNO(int seed, int num = 18)

154     {

155         long result = 0;

156         if (num > 20) num = 20;

157         string formatbase = "yyyyMMddhhmmssffffff";

158         string seedstr = seed.ToString().PadLeft(4, '0');

159         result = long.Parse((DateTime.Now.ToString(formatbase)).Substring(0, num - 4) + seedstr);

160         return result;

161     }

162     #endregion

163

164

165

166

167     //缩小图片

168     public Image Thumbnail(Image image, int width, int height)

169     {

170         var newWidth = width;

171         var newHeight = image.Height * newWidth / image.Width;

172

173         if (newHeight < height)

174         {

175             // Resize with height instead

176             newWidth = image.Width * height / image.Height;

177             newHeight = height;

178         }

179

180         var tempImage = new Bitmap(newWidth, newHeight);

181

182         using (var graphic = Graphics.FromImage(tempImage))

183         {

184             //指定高质量的双三次插值法。执行预筛选以确保高质量的收缩。此模式可产生质量最高的转换图像。

185             graphic.InterpolationMode = InterpolationMode.High;

186

187             //指定高速度呈现

188             graphic.SmoothingMode = SmoothingMode.HighQuality;

189

190             //  graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;

191

192             //线性质量设置

193             graphic.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

194             graphic.DrawImage(image, 0, 0, newWidth, newHeight);

195         }

196

197         var x = (newWidth - width) / 2;

198         var y = 0;

199         var thumbnail = tempImage.Clone(new Rectangle(x, y, width, height), tempImage.PixelFormat);

200

201         return thumbnail;

202     }

203

204     public bool IsReusable

205     {

206         get

207         {

208             return false;

209         }

210     }

211 }

212

213 public class UpLoadData

214 {

215     /// <summary>

216     /// 错误信息

217     /// </summary>

218     public string Error { set; get; }

219     /// <summary>

220     /// 文件名称

221     /// </summary>

222     public string FileName { set; get; }

223     /// <summary>

224     /// 文件路径

225     /// </summary>

226     public string FileUrl { set; get; }

227

228     public UpLoadData()

229     {

230         this.Error = string.Empty;

231         this.FileName = string.Empty;

232         this.FileUrl = string.Empty;

233     }

234 }