ASP.NET实现批量下载文件及附件的方法详细讲解
应用场景
发文管理员发送文件给用户，在发文的过程中，可以上传附件；作为普通用户，需要对收到的公司发文批量下载，下载要求能够下载公司发文的文件和附件。
问题难点：
（1）对多个文件及其附件进行打包，附件要和公司文件放在一起
（2）文件夹、文件命名的确定，因为使用原文件名，可能有重复
（3）对文件夹（包含文件及子文件夹，子文件夹下又有文件）进行打包
解决思路：
（1）创建和当前用户登陆名同名的临时文件夹，这个文件夹里存储了用户选择批量下载的所有文件及附件，临时文件夹名称以当前用户的登陆名命名，如张三的登陆名为zhangsan,则创建文件夹zhangsan
（2）在zhangsan文件夹里根据选择的公司文件数量创建子文件夹，选中了多少个公司文件就创建多少个子文件夹，子文件夹的命名采用公司文件的原名来命名，如公司文件为：2010060301公司文件.txt，发文后的文件名称为：4fe1c0ec-bd6c-4a76-9d49-f1745c7390db.txt，如果有重复，则进行处理。
（3）如果单个公司文件有附件，则在子文件夹下创建一个attchments文件夹，用于存储附件，如果没有附件则不创建
（4）临时文件夹及文件的创建完成后，使用file.copyto()的方法把文件及附件拷贝到相应的文件夹里，由于在上传的时候采用重命名，因为拷贝完成后，还要对临时文件夹里的文件进行重命名，使用的方法是file.move()/file.moveto()方法。
（5）打包文件夹，生成压缩格式的文件
（6）点击下载文件
核心代码：
private void DownLoadCompressFile()
{
//create file package
List<CompanyFileDomain> lists = new List<CompanyFileDomain>();
if (DeluxeGridFiles.SelectedKeys.Count > 0)
{
for (int i = 0; i < DeluxeGridFiles.SelectedKeys.Count; i++)
{
CompanyFileDomain companyFile = CompanyFileAdapter.Instance.Load(DeluxeGridFiles.SelectedKeys[i]);
lists.Add(companyFile);
}
}
BatchFiles batch = new BatchFiles(DeluxeIdentity.CurrentUser.LogOnName);
if (lists != null)
{
batch.CreatePackageByCompanyFileDomain(lists);
}
//compress package
string filepath =CompanyFileConfig.Instance.FileSavePath + "\\" + DeluxeIdentity.CurrentUser.LogOnName;
string filefolder=filepath + "\\";
string zipfilename =filepath + ".zip";
if (Directory.Exists(filefolder))
{
FastZip fastZip = new FastZip();
//zip filename is full file name
fastZip.CreateZip(zipfilename, filefolder, true, "");
}
FileInfo zipfile = new FileInfo(zipfilename);
if (zipfile.Exists && Directory.Exists(filefolder))
{
DirectoryInfo di = new DirectoryInfo(filefolder);
di.Delete(true);
//Directory.Delete(filefolder);
}
//download zip file
Response.Redirect("batchdown.aspx?FullFilePath=" + HttpUtility.UrlEncode(zipfilename) + "&FileName=" + HttpUtility.UrlEncode(DeluxeIdentity.CurrentUser.LogOnName + ".zip") + "");//传递参数到下载压缩包的页面，下载完成后把生成的压缩包删除掉
}
这里的创建压缩文件夹采用了ICSharpCode.SharpZipLib.Zip，其下载地址是：
http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx
这里调用了 fastZip.CreateZip(zipfilename, filefolder, true, "");来创建压缩包，注意这里的第一个参数要写存储的文件的全路径，否则不能生成压缩文件
batch.CreatePackageByCompanyFileDomain(lists);
这里是根据选择的文件创建临时文件包
/// <summary>
/// 根据文件列表创建下载文件夹，并在文件夹里放置所有文件及其附件
/// </summary>
/// <param name="companyfiles"></param>
public void CreatePackageByCompanyFileDomain(List<CompanyFileDomain> companyfiles)
{
if (companyfiles.Count > 0)
{
foreach (CompanyFileDomain fileEntity in companyfiles)
{
CreatePackageByCompanyFileDomain(fileEntity);
}
}
}
/// <summary>
/// 根据文件ID创建单个文件夹，并在其中放置文件及其附件
/// </summary>
/// <param name="resourceID"></param>
public void CreatePackageByCompanyFileDomain(CompanyFileDomain companyfile)
{
if (companyfile != null)
{
if (!Directory.Exists(downLoadPath))
{
Directory.CreateDirectory(downLoadPath);
}
string sourcefileNameWithoutExtend = companyfile.FileName.Substring(0,companyfile.FileName.Length-companyfile.ExtendFileName.Length);
string sourcefileFullPath = RootFilePath + companyfile.RelativePath + "\\" + companyfile.ID + companyfile.ExtendFileName;
string desfileFolder = downLoadPath + sourcefileNameWithoutExtend;
string desfileattchFolder = string.Empty;
if (Directory.Exists(desfileFolder))
{
desfileFolder = RenameFolder(desfileFolder);
}
desfileattchFolder = desfileFolder + "http://www.cnblogs.com/yungboy/admin/file://attchments//";
Directory.CreateDirectory(desfileFolder);
FileInfo newFile = new FileInfo(sourcefileFullPath);
newFile.CopyTo(desfileFolder + "\\" + companyfile.ID + companyfile.ExtendFileName);
FileInfo tempFile = new FileInfo(desfileFolder + "\\" + companyfile.ID + companyfile.ExtendFileName);
tempFile.MoveTo(Path.Combine(desfileFolder, companyfile.FileName));
//have attchement
MaterialList materials = MaterialAdapter.Instance.LoadMaterialsByResourceID(companyfile.ID);
if (materials.Count > 0)
{
Directory.CreateDirectory(desfileattchFolder);
foreach (Material ma in materials)
{
string sourceAttchFullPath = RootAttchPath.Remove(RootAttchPath.Length - 1, 1);
sourceAttchFullPath += ma.RelativeFilePath;
FileInfo attFile = new FileInfo(sourceAttchFullPath);
attFile.CopyTo(desfileattchFolder + ma.ID + attFile.Extension);
FileInfo tempAtt = new FileInfo(desfileattchFolder + ma.ID + attFile.Extension);
tempAtt.MoveTo(desfileattchFolder + ma.OriginalName);//重命名的实现
}
}
}
}
文章来自学IT网：http://www.xueit.com/asp.net/show-6916-2.aspx
核心代码：
private void DownLoadCompressFile()
{
//create file package
List<CompanyFileDomain> lists = new List<CompanyFileDomain>();
if (DeluxeGridFiles.SelectedKeys.Count > 0)
{
for (int i = 0; i < DeluxeGridFiles.SelectedKeys.Count; i++)
{
CompanyFileDomain companyFile = CompanyFileAdapter.Instance.Load(DeluxeGridFiles.SelectedKeys[i]);
lists.Add(companyFile);
}
}
BatchFiles batch = new BatchFiles(DeluxeIdentity.CurrentUser.LogOnName);
if (lists != null)
{
batch.CreatePackageByCompanyFileDomain(lists);
}
//compress package
string filepath =CompanyFileConfig.Instance.FileSavePath + "\\" + DeluxeIdentity.CurrentUser.LogOnName;
string filefolder=filepath + "\\";
string zipfilename =filepath + ".zip";
if (Directory.Exists(filefolder))
{
FastZip fastZip = new FastZip();
//zip filename is full file name
fastZip.CreateZip(zipfilename, filefolder, true, "");
}
FileInfo zipfile = new FileInfo(zipfilename);
if (zipfile.Exists && Directory.Exists(filefolder))
{
DirectoryInfo di = new DirectoryInfo(filefolder);
di.Delete(true);
//Directory.Delete(filefolder);
}
//download zip file
Response.Redirect("batchdown.aspx?FullFilePath=" + HttpUtility.UrlEncode(zipfilename) + "&FileName=" + HttpUtility.UrlEncode(DeluxeIdentity.CurrentUser.LogOnName + ".zip") + "");//传递参数到下载压缩包的页面，下载完成后把生成的压缩包删除掉
}
这里的创建压缩文件夹采用了ICSharpCode.SharpZipLib.Zip，其下载地址是：
http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx
这里调用了 fastZip.CreateZip(zipfilename, filefolder, true, "");来创建压缩包，注意这里的第一个参数要写存储的文件的全路径，否则不能生成压缩文件
batch.CreatePackageByCompanyFileDomain(lists);
这里是根据选择的文件创建临时文件包
/// <summary>
/// 根据文件列表创建下载文件夹，并在文件夹里放置所有文件及其附件
/// </summary>
/// <param name="companyfiles"></param>
public void CreatePackageByCompanyFileDomain(List<CompanyFileDomain> companyfiles)
{
if (companyfiles.Count > 0)
{
foreach (CompanyFileDomain fileEntity in companyfiles)
{
CreatePackageByCompanyFileDomain(fileEntity);
}
}
}
/// <summary>
/// 根据文件ID创建单个文件夹，并在其中放置文件及其附件
/// </summary>
/// <param name="resourceID"></param>
public void CreatePackageByCompanyFileDomain(CompanyFileDomain companyfile)
{
if (companyfile != null)
{
if (!Directory.Exists(downLoadPath))
{
Directory.CreateDirectory(downLoadPath);
}
string sourcefileNameWithoutExtend = companyfile.FileName.Substring(0,companyfile.FileName.Length-companyfile.ExtendFileName.Length);
string sourcefileFullPath = RootFilePath + companyfile.RelativePath + "\\" + companyfile.ID + companyfile.ExtendFileName;
string desfileFolder = downLoadPath + sourcefileNameWithoutExtend;
string desfileattchFolder = string.Empty;
if (Directory.Exists(desfileFolder))
{
desfileFolder = RenameFolder(desfileFolder);
}
desfileattchFolder = desfileFolder + "http://www.cnblogs.com/yungboy/admin/file://attchments//";
Directory.CreateDirectory(desfileFolder);
FileInfo newFile = new FileInfo(sourcefileFullPath);
newFile.CopyTo(desfileFolder + "\\" + companyfile.ID + companyfile.ExtendFileName);
FileInfo tempFile = new FileInfo(desfileFolder + "\\" + companyfile.ID + companyfile.ExtendFileName);
tempFile.MoveTo(Path.Combine(desfileFolder, companyfile.FileName));
//have attchement
MaterialList materials = MaterialAdapter.Instance.LoadMaterialsByResourceID(companyfile.ID);
if (materials.Count > 0)
{
Directory.CreateDirectory(desfileattchFolder);
foreach (Material ma in materials)
{
string sourceAttchFullPath = RootAttchPath.Remove(RootAttchPath.Length - 1, 1);
sourceAttchFullPath += ma.RelativeFilePath;
FileInfo attFile = new FileInfo(sourceAttchFullPath);
attFile.CopyTo(desfileattchFolder + ma.ID + attFile.Extension);
FileInfo tempAtt = new FileInfo(desfileattchFolder + ma.ID + attFile.Extension);
tempAtt.MoveTo(desfileattchFolder + ma.OriginalName);//重命名的实现
}
}
}
}
文章来自学IT网：http://www.xueit.com/asp.net/show-6916-2.aspx
核心代码：
private void DownLoadCompressFile()
{
//create file package
List<CompanyFileDomain> lists = new List<CompanyFileDomain>();
if (DeluxeGridFiles.SelectedKeys.Count > 0)
{
for (int i = 0; i < DeluxeGridFiles.SelectedKeys.Count; i++)
{
CompanyFileDomain companyFile = CompanyFileAdapter.Instance.Load(DeluxeGridFiles.SelectedKeys[i]);
lists.Add(companyFile);
}
}
BatchFiles batch = new BatchFiles(DeluxeIdentity.CurrentUser.LogOnName);
if (lists != null)
{
batch.CreatePackageByCompanyFileDomain(lists);
}
//compress package
string filepath =CompanyFileConfig.Instance.FileSavePath + "\\" + DeluxeIdentity.CurrentUser.LogOnName;
string filefolder=filepath + "\\";
string zipfilename =filepath + ".zip";
if (Directory.Exists(filefolder))
{
FastZip fastZip = new FastZip();
//zip filename is full file name
fastZip.CreateZip(zipfilename, filefolder, true, "");
}
FileInfo zipfile = new FileInfo(zipfilename);
if (zipfile.Exists && Directory.Exists(filefolder))
{
DirectoryInfo di = new DirectoryInfo(filefolder);
di.Delete(true);
//Directory.Delete(filefolder);
}
//download zip file
Response.Redirect("batchdown.aspx?FullFilePath=" + HttpUtility.UrlEncode(zipfilename) + "&FileName=" + HttpUtility.UrlEncode(DeluxeIdentity.CurrentUser.LogOnName + ".zip") + "");//传递参数到下载压缩包的页面，下载完成后把生成的压缩包删除掉
}
这里的创建压缩文件夹采用了ICSharpCode.SharpZipLib.Zip，其下载地址是：
http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx
这里调用了 fastZip.CreateZip(zipfilename, filefolder, true, "");来创建压缩包，注意这里的第一个参数要写存储的文件的全路径，否则不能生成压缩文件
batch.CreatePackageByCompanyFileDomain(lists);
这里是根据选择的文件创建临时文件包
/// <summary>
/// 根据文件列表创建下载文件夹，并在文件夹里放置所有文件及其附件
/// </summary>
/// <param name="companyfiles"></param>
public void CreatePackageByCompanyFileDomain(List<CompanyFileDomain> companyfiles)
{
if (companyfiles.Count > 0)
{
foreach (CompanyFileDomain fileEntity in companyfiles)
{
CreatePackageByCompanyFileDomain(fileEntity);
}
}
}
/// <summary>
/// 根据文件ID创建单个文件夹，并在其中放置文件及其附件
/// </summary>
/// <param name="resourceID"></param>
public void CreatePackageByCompanyFileDomain(CompanyFileDomain companyfile)
{
if (companyfile != null)
{
if (!Directory.Exists(downLoadPath))
{
Directory.CreateDirectory(downLoadPath);
}
string sourcefileNameWithoutExtend = companyfile.FileName.Substring(0,companyfile.FileName.Length-companyfile.ExtendFileName.Length);
string sourcefileFullPath = RootFilePath + companyfile.RelativePath + "\\" + companyfile.ID + companyfile.ExtendFileName;
string desfileFolder = downLoadPath + sourcefileNameWithoutExtend;
string desfileattchFolder = string.Empty;
if (Directory.Exists(desfileFolder))
{
desfileFolder = RenameFolder(desfileFolder);
}
desfileattchFolder = desfileFolder + "http://wwwcccc.com/yungboy/admin/file://attchments//";
Directory.CreateDirectory(desfileFolder);
FileInfo newFile = new FileInfo(sourcefileFullPath);
newFile.CopyTo(desfileFolder + "\\" + companyfile.ID + companyfile.ExtendFileName);
FileInfo tempFile = new FileInfo(desfileFolder + "\\" + companyfile.ID + companyfile.ExtendFileName);
tempFile.MoveTo(Path.Combine(desfileFolder, companyfile.FileName));
//have attchement
MaterialList materials = MaterialAdapter.Instance.LoadMaterialsByResourceID(companyfile.ID);
if (materials.Count > 0)
{
Directory.CreateDirectory(desfileattchFolder);
foreach (Material ma in materials)
{
string sourceAttchFullPath = RootAttchPath.Remove(RootAttchPath.Length - 1, 1);
sourceAttchFullPath += ma.RelativeFilePath;
FileInfo attFile = new FileInfo(sourceAttchFullPath);
attFile.CopyTo(desfileattchFolder + ma.ID + attFile.Extension);
FileInfo tempAtt = new FileInfo(desfileattchFolder + ma.ID + attFile.Extension);
tempAtt.MoveTo(desfileattchFolder + ma.OriginalName);//重命名的实现
}
}
}
}
