Main method - see class description.
/* Read the name of the POI filesystem to modify from the command line.
* For brevity to boundary check is performed on the command-line
* arguments. */
File poiFilesystem = new File(args[0]);
/* Open the POI filesystem. */
InputStream is = new FileInputStream(poiFilesystem);
POIFSFileSystem poifs = new POIFSFileSystem(is);
is.close();
/* Read the summary information. */
DirectoryEntry dir = poifs.getRoot();
SummaryInformation si;
try
{
DocumentEntry siEntry = (DocumentEntry)
dir.getEntry(SummaryInformation.DEFAULT_STREAM_NAME);
DocumentInputStream dis = new DocumentInputStream(siEntry);
PropertySet ps = new PropertySet(dis);
dis.close();
si = new SummaryInformation(ps);
}
catch (FileNotFoundException ex)
{
/* There is no summary information yet. We have to create a new
* one. */
si = PropertySetFactory.newSummaryInformation();
}
/* Change the author to "Rainer Klute". Any former author value will
* be lost. If there has been no author yet, it will be created. */
si.setAuthor("Rainer Klute");
System.out.println("Author changed to " + si.getAuthor() + ".");
/* Handling the document summary information is analogous to handling
* the summary information. An additional feature, however, are the
* custom properties. */
/* Read the document summary information. */
DocumentSummaryInformation dsi;
try
{
DocumentEntry dsiEntry = (DocumentEntry)
dir.getEntry(DocumentSummaryInformation.DEFAULT_STREAM_NAME);
DocumentInputStream dis = new DocumentInputStream(dsiEntry);
PropertySet ps = new PropertySet(dis);
dis.close();
dsi = new DocumentSummaryInformation(ps);
}
catch (FileNotFoundException ex)
{
/* There is no document summary information yet. We have to create a
* new one. */
dsi = PropertySetFactory.newDocumentSummaryInformation();
}
/* Change the category to "POI example". Any former category value will
* be lost. If there has been no category yet, it will be created. */
dsi.setCategory("POI example");
System.out.println("Category changed to " + dsi.getCategory() + ".");
/* Read the custom properties. If there are no custom properties yet,
* the application has to create a new CustomProperties object. It will
* serve as a container for custom properties. */
CustomProperties customProperties = dsi.getCustomProperties();
if (customProperties == null)
customProperties = new CustomProperties();
/* Insert some custom properties into the container. */
customProperties.put("Key 1", "Value 1");
customProperties.put("Schlüssel 2", "Wert 2");
customProperties.put("Sample Number", new Integer(12345));
customProperties.put("Sample Boolean", new Boolean(true));
customProperties.put("Sample Date", new Date());
/* Read a custom property. */
Object value = customProperties.get("Sample Number");
/* Write the custom properties back to the document summary
* information. */
dsi.setCustomProperties(customProperties);
/* Write the summary information and the document summary information
* to the POI filesystem. */
si.write(dir, SummaryInformation.DEFAULT_STREAM_NAME);
dsi.write(dir, DocumentSummaryInformation.DEFAULT_STREAM_NAME);
/* Write the POI filesystem back to the original file. Please note that
* in production code you should never write directly to the origin
* file! In case of a writing error everything would be lost. */
OutputStream out = new FileOutputStream(poiFilesystem);
poifs.writeFilesystem(out);
out.close();
