This could very well be possible; I have certainly had some success creating
new Word documents using the API. Merging one document into another is more
tricky and not something I would try to do myself with the API just yet. The
first thing is to be clear on is exactly how you wish to compare the
documents. Are you saying that you want to compare two versions of the same
document and note any changes that have been made? Are you looking just at
the text and not at any formatting applied to the text?
If so, then you could use the WordExtractor class to get at the text of the
two documents. This class can return an array of String(s) where each
element maps to a paragraph (I think) in the source document. Next, you
could compare the elements within the arrays to determine if a paragraph had
been deleted, added, moved, modified, etc. If you found a difference and
identified what it was, then that paragraph could be written away a new
'results' document. To be completely honest, I have never tried to do much
work with the formatting of the text and I cannot claim sole authorship of
this code because I got a start from an example I found on the 'net. Anyway,
here is some very simple code to create a Word document;
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream("..empty
file.."));
HWPFDocument doc = new HWPFDocument(fs);
// centered paragraph with large font size
Range range = doc.getRange();
Paragraph par1 = range.insertAfter(new ParagraphProperties(), 0);
par1.setSpacingAfter(200);
// justification: 0=left, 1=center, 2=right, 3=left and right
par1.setJustification((byte) 1);
CharacterRun run1 = par1.insertAfter("one");
run1.setFontSize(2 * 18);
// paragraph with bold typeface
Paragraph par2 = run1.insertAfter(new ParagraphProperties(), 0);
par2.setSpacingAfter(200);
CharacterRun run2 = par2.insertAfter("two two two two two two two two two
two two two two");
run2.setBold(true);
// paragraph with italic typeface and a line indent in the first line
Paragraph par3 = run2.insertAfter(new ParagraphProperties(), 0);
par3.setFirstLineIndent(200);
par3.setSpacingAfter(200);
CharacterRun run3 = par3.insertAfter("three three three three three three
three three three "
+ "three three three three three three three three three three three
three three three "
+ "three three three three three three three three three three three
three three three");
run3.setItalic(true);
// add a custom document property (needs POI 3.5; POI 3.2 doesn't save
custom properties)
DocumentSummaryInformation dsi = doc.getDocumentSummaryInformation();
CustomProperties cp = dsi.getCustomProperties();
if (cp == null) {
cp = new CustomProperties();
}
cp.put("myProperty", "prop prop prop");
dsi.setCustomProperties(cp);
doc.write(new FileOutputStream("..final file.."));
The key wrinkle is that HWPF cannot actually create a new, empty Word
document; you will need to use Word itself to create a new file that can be
used as the input to this process - I have called it the empty file in the
code above. All you need to do is open Word, select New->Document and then
save this away. Use this empty file as the input to the process and you
should be away.
There is a setColor() method defined on the CharacterRun class but I have
never used it myself. The only advice I can offer is to play with it and see
what the effect is on a simple bit of code such as this one. You will have
access to the usual effects such as strikethrough again using the
CharacterRun class.
Yours
Mark B
bihag wrote:
>
> Hi All,
>
> We want to compare two document and what ever things are not common that
> we have to highlight with some color or any other way ... So I thing we
> have to merge document or create new document which has content of both
> the document, and show difference with some color, like deleted with red,
> newly added with blue ...
>
> Mainly we are looking for OLE2CDF doc compare solution ...
>
> please provide some code sniplet if possible ...
>
> Thanking you in advance ...
>
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