最近在研究企业文档管理，这个是基本上所有企业都需要的软件，当然也是有很多种解决方案。对于企业文档来说，最基本的需求就是独立存储，共享。这种需求只需要建立一个Windows共享文件夹或者架一个Samba服务器即可实现，无法做复杂的权限管理，统计等。另一种方案就是架一个Web应用，比如SharePoint，就可以实现。
既然是WEB应用，进一步的需求是能够在线查看文档，根据用户需求可能不允许下载，不允许打印文档。这一点微软的高级解决方案是使用RMS，能够设置每个用户的打开权限，是否打印等，要求必须是域内，而且只管理Office文件的权限，对txt，pdf就没办法了。另外一个解决方案是在线文档预览，用户在网页中查看文档内容，用户无需拿到原始文档，如果有权限的话，可以允许用户下载文档。这就就是百度文库，豆丁之类的网站的功能。下面来说说怎么实现。
1.文档统一转换为pdf这里的文档我们要看是什么格式，不同的格式有不同的转换方法。
1.1 Office文档转换pdf对于Office文档（Word，Excel，PowerPoint），那么可以调用Office提供的COM接口，把文档另存为PDF。这个要求服务器上必须安装Office，同时要注意权限，不然很容易导致在本地调试时可以转换为PDF，但是一旦部署到服务器上去就不行。另外还需要注意的是，如果Office转换pdf时发生异常，可能导致Office的进程驻留在服务器，不断驻留Office进程会导致服务器资源耗尽。
这是Office文档转换为pdf的代码：
/// <summary>
/// 将word文档转换成PDF格式
/// </summary>
/// <param name="sourcePath"></param>
/// <param name="targetPath"></param>
/// <returns></returns>
public static bool ConvertWord2Pdf(string sourcePath, string targetPath)
{
bool result;
Word.WdExportFormat exportFormat= Word.WdExportFormat.wdExportFormatPDF;
object paramMissing = Type.Missing;
Word.Application wordApplication = new Word.Application();
Word.Document wordDocument = null;
try
{
object paramSourceDocPath = sourcePath;
string paramExportFilePath = targetPath;
Word.WdExportFormat paramExportFormat = exportFormat;
Word.WdExportOptimizeFor paramExportOptimizeFor =
Word.WdExportOptimizeFor.wdExportOptimizeForPrint;
Word.WdExportRange paramExportRange = Word.WdExportRange.wdExportAllDocument;
int paramStartPage = 0;
int paramEndPage = 0;
Word.WdExportItem paramExportItem = Word.WdExportItem.wdExportDocumentContent;
Word.WdExportCreateBookmarks paramCreateBookmarks =
Word.WdExportCreateBookmarks.wdExportCreateWordBookmarks;
wordDocument = wordApplication.Documents.Open(
ref paramSourceDocPath, ref paramMissing, ref paramMissing,
ref paramMissing, ref paramMissing, ref paramMissing,
ref paramMissing, ref paramMissing, ref paramMissing,
ref paramMissing, ref paramMissing, ref paramMissing,
ref paramMissing, ref paramMissing, ref paramMissing,
ref paramMissing);
if (wordDocument != null)
wordDocument.ExportAsFixedFormat(paramExportFilePath,
paramExportFormat, false,
paramExportOptimizeFor, paramExportRange, paramStartPage,
paramEndPage, paramExportItem, true,
true, paramCreateBookmarks, true,
true, false,
ref paramMissing);
result = true;
}
finally
{
if (wordDocument != null)
{
wordDocument.Close(ref paramMissing, ref paramMissing, ref paramMissing);
wordDocument = null;
}
if (wordApplication != null)
{
wordApplication.Quit(ref paramMissing, ref paramMissing, ref paramMissing);
wordApplication = null;
}
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
}
return result;
}
/// <summary>
/// 将excel文档转换成PDF格式
/// </summary>
/// <param name="sourcePath"></param>
/// <param name="targetPath"></param>
/// <returns></returns>
public static bool ConvertExcel2Pdf(string sourcePath, string targetPath)
{
bool result;
object missing = Type.Missing;
Excel.XlFixedFormatType targetType= Excel.XlFixedFormatType.xlTypePDF;
Excel.Application application = null;
Excel.Workbook workBook = null;
try
{
application = new Excel.Application();
object target = targetPath;
workBook = application.Workbooks.Open(sourcePath, missing, missing, missing, missing, missing,
missing, missing, missing, missing, missing, missing, missing, missing, missing);
workBook.ExportAsFixedFormat(targetType, target, Excel.XlFixedFormatQuality.xlQualityStandard, true, false, missing, missing, missing, missing);
result = true;
}
catch
{
result = false;
}
finally
{
if (workBook != null)
{
workBook.Close(true, missing, missing);
workBook = null;
}
if (application != null)
{
application.Quit();
application = null;
}
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
}
return result;
}
/// <summary>
/// 将ppt文档转换成PDF格式
/// </summary>
/// <param name="sourcePath"></param>
/// <param name="targetPath"></param>
/// <returns></returns>
public static bool ConvertPowerPoint2Pdf(string sourcePath, string targetPath)
{
bool result;
PowerPoint.PpSaveAsFileType targetFileType= PowerPoint.PpSaveAsFileType.ppSaveAsPDF;
PowerPoint.Application application = null;
PowerPoint.Presentation persentation = null;
try
{
application = new PowerPoint.Application();
persentation = application.Presentations.Open(sourcePath, MsoTriState.msoTrue, MsoTriState.msoFalse, MsoTriState.msoFalse);
persentation.SaveAs(targetPath, targetFileType, MsoTriState.msoTrue);
result = true;
}
catch
{
result = false;
}
finally
{
if (persentation != null)
{
persentation.Close();
persentation = null;
}
if (application != null)
{
application.Quit();
application = null;
}
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
}
return result;
}