//获取对应文件的内容,这里主要取comm.FileURL的文件保存动态路径，也就是20150825/5e7af276b7754363a1e78b496e1d1603文本文档.txt

             CommNoticeModel comm = CommNoticeBLL.GetInstance().GetCommNoticeModel(int.Parse(Request.QueryString["ID"]));

             //这里主要组成文件的相对路径，这里得到的就是  ~/FileBox/20150825/5e7af276b7754363a1e78b496e1d1603文本文档.txt

             string path = CommonUtilModel.GetFileVirtualPath() + comm.FileURL;

             try

             {

                 FileInfo fileInfo = new FileInfo(Server.MapPath(path));

                 Response.Clear();

                 Response.ClearContent();

                 Response.ClearHeaders();

                 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileInfo.Name);

                 Response.AddHeader("Content-Length", fileInfo.Length.ToString());

                 Response.AddHeader("Content-Transfer-Encoding", "binary");

                 // 告诉浏览器传递给用用户的是一个非txt,rar等不出现在IEEM上的一个文件，不需要在浏览器页面打开，需要直接下载

                 Response.ContentType = "application/octet-stream";

                 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");

                 Response.WriteFile(fileInfo.FullName);

                 Response.Flush();

                 Response.End();

             }

             catch (Exception ex)

             {

                 Response.Clear();

                 Response.ClearContent();

                 Response.ClearHeaders();

                 Response.Write(ex.Message + "<br/>" + path);

                 Response.End();

             }