ORM映射框架总结--文件下载

  1  /* *
  2   * 日期：2009-3-13
  3   * 作者：
  4   * 功能：下载文件
  5   *  */
  6 
  7  using  System;
  8  using  System.Configuration;
  9  using  System.Data;
 10  using  System.Linq;
 11  using  System.Web;
 12  using  System.Web.Security;
 13  using  System.Web.UI;
 14  using  System.Web.UI.HtmlControls;
 15  using  System.Web.UI.WebControls;
 16  using  System.Web.UI.WebControls.WebParts;
 17  using  System.Xml.Linq;
 18  using  System.Web.Services;
 19  using  System.IO;
 20  using  CommonData.Exceptions;
 21 
 22  namespace  CommonData.DownLoad
 23  {
 24       public   partial   class  Down
 25      {
 26 
 27           #region (下载相关属性)
 28           private   string  _downFilePath;
 29 
 30           ///   <summary>
 31           ///  下载文件路径
 32           ///   </summary>
 33           public   string  DownFilePath
 34          {
 35               get  {  return  _downFilePath; }
 36               set  { _downFilePath  =  value; }
 37          }
 38 
 39           private   string  _fileName;
 40 
 41           ///   <summary>
 42           ///  下载的文件名称
 43           ///   </summary>
 44           private   string  FileName
 45          {
 46               get  {  return   this ._downFilePath.Substring( this ._downFilePath.LastIndexOf( " \\ " )  +   1 ); }
 47               set  { _fileName  =  value; }
 48          }
 49 
 50           private   string  _saveName;
 51 
 52           ///   <summary>
 53           ///  下载保存文件名称
 54           ///   </summary>
 55           public   string  SaveName
 56          {
 57               get  {  return  _saveName; }
 58               set  { _saveName  =  value; }
 59          }
 60           #endregion
 61 
 62           #region  (构造方法)
 63           ///   <summary>
 64           ///  无参数构造方法
 65           ///   </summary>
 66           public  Down()
 67          {
 68          }
 69 
 70           ///   <summary>
 71           ///  有参数构造方法
 72           ///   </summary>
 73           ///   <param name="downFilePath"> 下载文件的物理路径 </param>
 74           public  Down( string  downFilePath)
 75          {
 76               this ._downFilePath  =  downFilePath;
 77          }
 78 
 79           ///   <summary>
 80           ///  有参数的构造方法
 81           ///   </summary>
 82           ///   <param name="downFilePath"> 下载文件的物理路径 </param>
 83           ///   <param name="saveName"> 下载保存文件的名称 </param>
 84           public  Down( string  downFilePath,  string  saveName)
 85          {
 86               this ._downFilePath  =  downFilePath;
 87               this ._saveName  =  saveName;
 88          }
 89           #endregion
 90 
 91 
 92 
 93           #region (TransmitFile)
 94           ///   <summary>
 95           ///  下载超过400mb的文件（TransmitFile）
 96           ///   </summary>
 97           ///   <param name="filepath"> 下载文件的物理路径 </param>
 98           ///   <param name="saveName"> 下载保存的文件名称 </param>
 99           ///   <returns></returns>
100           public   void  TransmitFile( string  filepath,  string  saveName)
101          {
102               this ._downFilePath  =  filepath;
103               if  ( string .IsNullOrEmpty(saveName))
104              {
105                   this ._saveName  =   this .FileName;
106              }
107               else
108              {
109                   this ._saveName  =  saveName;
110              }
111               if  ( ! string .IsNullOrEmpty( this .DownFilePath))
112              {
113                   if  (File.Exists( this ._downFilePath))
114                  {
115                      System.Web.HttpContext.Current.Response.ContentType  =   " application/octet-stream " ;
116                      System.Web.HttpContext.Current.Response.AddHeader( " Content-Disposition " ,  " attachment;filename= "   +  System.Web.HttpUtility.UrlEncode( this .SaveName, System.Text.Encoding.UTF8));
117                      System.Web.HttpContext.Current.Response.TransmitFile( this ._downFilePath);
118                  }
119                   else
120                  {
121                       throw   new  CommonFileException( " 下载的文件已经被删除！ " );
122                  }
123              }
124               else
125              {
126                   throw   new  CommonFileException( " 未提供可供下载的文件路径 " );
127              }
128          }
129 
130           ///   <summary>
131           ///  下载超过400mb的文件（TransmitFile）
132           ///   </summary>
133           ///   <param name="filepath"> 下载文件的物理路径 </param>
134           public   void  TransmitFile( string  filepath)
135          {
136               this .TransmitFile(filepath,  "" );
137          }
138 
139           ///   <summary>
140           ///  下载超过400mb的文件（TransmitFile）
141           ///   </summary>
142           ///   <returns></returns>
143           public   void  TransmitFile()
144          {
145               this .TransmitFile( this ._downFilePath,  this .SaveName);
146          }
147           #endregion
148 
149 
150           #region (WriteFile)
151           ///   <summary>
152           ///  WriteFile 
153           ///   </summary>
154           ///   <param name="filepath"> 下载文件的物理路径 </param>
155           ///   <param name="saveName"> 下载保存的文件名称 </param>
156           public   void  WriteFile( string  filepath,  string  saveName)
157          {
158               this ._downFilePath  =  filepath;
159               if  ( string .IsNullOrEmpty(saveName))
160              {
161                   this ._saveName  =   this .FileName;
162              }
163               else
164              {
165                   this ._saveName  =  saveName;
166              }
167               if  ( ! string .IsNullOrEmpty( this .DownFilePath))
168              {
169                   if  (File.Exists( this .DownFilePath))
170                  {
171                      FileInfo fileInfo  =   new  FileInfo( this ._downFilePath);
172                      System.Web.HttpContext.Current.Response.Clear();
173                      System.Web.HttpContext.Current.Response.ClearContent();
174                      System.Web.HttpContext.Current.Response.ClearHeaders();
175                      System.Web.HttpContext.Current.Response.AddHeader( " Content-Disposition " ,  " attachment;filename= "   +  HttpUtility.UrlPathEncode( this ._saveName));
176                      System.Web.HttpContext.Current.Response.AddHeader( " Content-Length " , fileInfo.Length.ToString());
177                      System.Web.HttpContext.Current.Response.AddHeader( " Content-Transfer-Encoding " ,  " binary " );
178                      System.Web.HttpContext.Current.Response.ContentType  =   " application/octet-stream " ;
179                      System.Web.HttpContext.Current.Response.ContentEncoding  =  System.Text.Encoding.GetEncoding( " gb2312 " );
180                      System.Web.HttpContext.Current.Response.WriteFile(fileInfo.FullName);
181                      System.Web.HttpContext.Current.Response.Flush();
182                      System.Web.HttpContext.Current.Response.End();
183                  }
184                   else
185                  {
186                       throw   new  CommonFileException( " 下载的文件已经被移除！ " );
187                  }
188              }
189               else
190              {
191                   throw   new  CommonFileException( " 未提供可供下载的文件路径！ " );
192              }
193          }
194 
195           ///   <summary>
196           ///  WriteFile
197           ///   </summary>
198           ///   <param name="filepath"> 下载文件的物理路径 </param>
199           public   void  WriteFile( string  filepath)
200          {
201               this .WriteFile(filepath,  "" );
202          }
203 
204 
205           ///   <summary>
206           ///  WriteFile
207           ///   </summary>
208           public   void  WriteFile()
209          {
210               this .WriteFile( this ._downFilePath,  this ._saveName);
211          }
212 
213           #endregion
214 
215           #region (WriteFile分块下载)
216           ///   <summary>
217           ///  WriteFile分块下载
218           ///   </summary>
219           ///   <param name="filepath"> 下载文件的物理路径 </param>
220           ///   <param name="saveName"> 下载保存文件的名称 </param>
221           public   void  WriteFilePart( string  filepath,  string  saveName)
222          {
223               this ._downFilePath  =  filepath;
224               if  ( string .IsNullOrEmpty(saveName))
225              {
226                   this ._saveName  =   this .FileName;
227              }
228               else
229              {
230                   this ._saveName  =  saveName;
231              }
232 
233               if  ( ! string .IsNullOrEmpty( this .DownFilePath))
234              {
235                   if  (File.Exists( this .DownFilePath))
236                  {
237                       const   long  ChunkSize  =   102400 ; // 100K 每次读取文件，只读取100K，这样可以缓解服务器的压力 
238                       byte [] buffer  =   new   byte [ChunkSize];
239 
240                      System.Web.HttpContext.Current.Response.Clear();
241                      FileStream iStream  =  File.OpenRead( this .DownFilePath);
242                       long  dataLengthToRead  =  iStream.Length; // 获取下载的文件总大小 
243                      System.Web.HttpContext.Current.Response.ContentType  =   " application/octet-stream " ;
244                      System.Web.HttpContext.Current.Response.AddHeader( " Content-Disposition " ,  " attachment; filename= "   +  HttpUtility.UrlEncode( this .SaveName));
245                       while  (dataLengthToRead  >   0   &&  System.Web.HttpContext.Current.Response.IsClientConnected)
246                      {
247                           int  lengthRead  =  iStream.Read(buffer,  0 , Convert.ToInt32(ChunkSize)); // 读取的大小 
248                          System.Web.HttpContext.Current.Response.OutputStream.Write(buffer,  0 , lengthRead);
249                          System.Web.HttpContext.Current.Response.Flush();
250                          dataLengthToRead  =  dataLengthToRead  -  lengthRead;
251                      }
252                      System.Web.HttpContext.Current.Response.Close();
253 
254                  }
255                   else
256                  {
257                       throw   new  CommonFileException( " 下载的文件已经被移除！ " );
258                  }
259              }
260               else
261              {
262                   throw   new  CommonFileException( " 未提供可供下载的文件路径！ " );
263              }
264          }
265 
266           ///   <summary>
267           ///  WriteFile分块下载
268           ///   </summary>
269           ///   <param name="filepath"> 下载文件的物理路径 </param>
270           public   void  WriteFilePart( string  filepath)
271          {
272               this .WriteFilePart(filepath,  "" );
273          }
274 
275           ///   <summary>
276           ///  WriteFile分块下载
277           ///   </summary>
278           public   void  WriteFilePart()
279          {
280               this .WriteFilePart( this .DownFilePath,  this .SaveName);
281          }
282           #endregion
283 
284 
285           #region (以流的方式下载)
286           ///   <summary>
287           ///  以流的方式下载
288           ///   </summary>
289           ///   <param name="filepath"> 下载文件的物理路径 </param>
290           ///   <param name="saveName"> 下载保存文件的名称 </param>
291           public   void  DownStream( string  filepath,  string  saveName)
292          {
293               this ._downFilePath  =  filepath;
294               if  ( string .IsNullOrEmpty(saveName))
295              {
296                   this ._saveName  =   this .FileName;
297              }
298               else
299              {
300                   this ._saveName  =  saveName;
301              }
302               if  ( ! string .IsNullOrEmpty( this .DownFilePath))
303              {
304                   if  (File.Exists( this .DownFilePath))
305                  {
306                       // 以字符流的形式下载文件 
307                      FileStream fs  =   new  FileStream( this .DownFilePath, FileMode.Open);
308                       byte [] bytes  =   new   byte [( int )fs.Length];
309                      fs.Read(bytes,  0 , bytes.Length);
310                      fs.Close();
311                      System.Web.HttpContext.Current.Response.ContentType  =   " application/octet-stream " ;
312                       // 通知浏览器下载文件而不是打开 
313                      System.Web.HttpContext.Current.Response.AddHeader( " Content-Disposition " ,  " attachment; filename= "   +  HttpUtility.UrlEncode( this .SaveName, System.Text.Encoding.UTF8));
314                      System.Web.HttpContext.Current.Response.BinaryWrite(bytes);
315                      System.Web.HttpContext.Current.Response.Flush();
316                      System.Web.HttpContext.Current.Response.End();
317                  }
318                   else
319                  {
320                       throw   new  CommonFileException( " 下载的文件已经被移除！ " );
321                  }
322              }
323               else
324              {
325                   throw   new  CommonFileException( " 未提供可供下载的文件路径！ " );
326              }
327 
328          }
329 
330           ///   <summary>
331           ///  以流的方式下载
332           ///   </summary>
333           ///   <param name="filepath"> 下载文件的物理路径 </param>
334           public   void  DownStream( string  filepath)
335          {
336               this .DownStream(filepath,  "" );
337          }
338 
339           ///   <summary>
340           ///  以流的方式下载
341           ///   </summary>
342           public   void  DownStream()
343          {
344               this .DownStream( this .DownFilePath,  this .SaveName);
345          }
346           #endregion
347 
348           #region (下载一个动态产生的文本文件)
349           ///   <summary>
350           ///  下载一个动态产生的文本文件
351           ///   </summary>
352           ///   <param name="webForm"> 父页面对象 </param>
353           ///   <param name="saveName"> 下载保存文件的名称 </param>
354           ///   <param name="fileBody"> 下载文件的内容 </param>
355           public   void  DownloadFile(System.Web.UI.Page webForm,  string  saveName,  string  fileBody)
356          {
357               this ._saveName  =  saveName;
358              webForm.Response.ClearHeaders();
359              webForm.Response.Clear();
360              webForm.Response.Expires  =   0 ;
361              webForm.Response.Buffer  =   true ;
362              webForm.Response.AddHeader( " Accept-Language " ,  " zh-tw " );
363               // '文件名称
364              webForm.Response.AddHeader( " content-disposition " ,  " attachment; filename=' "   +  System.Web.HttpUtility.UrlEncode( this .SaveName, System.Text.Encoding.UTF8)  +   " ' " );
365              webForm.Response.ContentType  =   " Application/octet-stream " ;
366               // '文件内容
367              webForm.Response.Write(fileBody); // -----------
368              webForm.Response.End();
369          }
370           #endregion
371 
372           ///   <summary>
373           ///  下载一个服务端存在文件文本文件
374           ///   </summary>
375           ///   <param name="webForm"> 父页面对象 </param>
376           ///   <param name="saveName"> 下载保存文件的名称 </param>
377           ///   <param name="filepath"> 下载文件路径 </param>
378          [Obsolete]
379           private   void  DownloadFileByFilePath(System.Web.UI.Page webForm,  string  saveName,  string  filepath)
380          {
381               this ._downFilePath  =  filepath;
382               if  ( string .IsNullOrEmpty(saveName))
383              {
384                   this ._saveName  =   this .FileName;
385              }
386               else
387              {
388                   this ._saveName  =  saveName;
389              }
390 
391               if  ( ! string .IsNullOrEmpty( this .DownFilePath))
392              {
393                   if  (File.Exists( this .DownFilePath))
394                  {
395                      webForm.Response.ClearHeaders();
396                      webForm.Response.Clear();
397                      webForm.Response.Expires  =   0 ;
398                      webForm.Response.Buffer  =   true ;
399                      webForm.Response.AddHeader( " Accept-Language " ,  " zh-tw " );
400                       // 文件名称
401                      webForm.Response.AddHeader( " content-disposition " ,  " attachment; filename= "   +  System.Web.HttpUtility.UrlEncode( this .SaveName, System.Text.Encoding.UTF8));
402                      webForm.Response.ContentType  =   " Application/octet-stream " ;
403                       // 文件内容
404                      webForm.Response.Write(System.IO.File.ReadAllBytes( this .DownFilePath).ToString()); // ---------
405                      webForm.Response.End();
406                  }
407                   else
408                  {
409                       throw   new  CommonFileException( " 下载的文件已经被移除！ " );
410                  }
411              }
412               else
413              {
414                   throw   new  CommonFileException( " 未提供可供下载的文件路径！ " );
415 
416              }
417          }
418 
419      }
420  }
421