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Message-ID: <2FCA28240297D41185310002B30286C29D3BDD@bcis006.corp.sengen.com>
From: Ravindran Ramaiah <ravi@sengen.com>
To: "'struts-user@jakarta.apache.org'" <struts-user@jakarta.apache.org>
Subject: RE: Struts - XML - XSL
Date: Mon, 24 Sep 2001 11:51:16 -0400
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Following are the procedures that can used to apply the style sheet
--------------------------------------------------------------------

Once we have already parsed the XML document, the getDocument method =
from
the parser instance (e.g. DOMParser) should return  an object of type
Document (which is actually a DOM representation of the XML). This will =
be
the starting point.

To apply the XSLT transformation, you perform the following steps:

1.  Create a DOMSource object and implicitly cast it to a SAX =
InputSource
object. The constructor takes in the Document object as a parameter.

InputSource source =3D new DOMSource(document);

2.  Instantiate a StyleGenerator object and pass the fully-qualified =
class
names of the XML and XSL parsers you want to use.

StyleGenerator stylegen =3D new StyleGenerator(Consts.SOURCEDOC_PARSER,
Consts.STYLESHEET_PARSER);

Where:
SOURCEDOC_PARSER		"com.sengen.utils.DOMParserExtension"
STYLESHEET_PARSER		"org.apache.xerces.parsers.SAXParser"

You can plug-in any DOM / SAX compliant parser you like. In this case =
we are
using two different parsers: a DOM parser for the XML and a SAX parser =
for
the XSL. The setup does not have to be this way. This is also the =
reason why
we have to implicitly casting in step one.

3. Lastly, call the StyleGenerator's applyStylesheet method. =
Originally, it
only deals with filenames but I overloaded it to accomodate InputSource =
and
streams. The resulting or transformed XML document is either written to =
a
file or returned as a byte stream.

public void applyStylesheet(String sourceFileName, String =
styleFileName,
String outputFileName) throws Exception
public ByteArrayOutputStream applyStylesheet(String sourceFileName, =
String
styleFileName) throws Exception
public void applyStylesheet(InputSource sourceInput, String =
styleFileName,
String outputFileName) throws Exception
public ByteArrayOutputStream applyStylesheet(InputSource sourceInput, =
String
styleFileName) throws Exception

Where:
sourceFileName			XML filename
styleFileName			XSL filename **	=09
outputFileName			filename of the resulting (transformed) XML
sourceInput 			InputSource object created in step 1


** any type of stylesheet like XSL-2-HTML, XSL-2-FO,  XSL-2-whatever


-lines 3 and 4 correspond to steps 1 and 2 above.
-In line 7, he used the fourth version of the applyStylesheet method =
and
converted the byte array to a
string. This string is now the HTML transformation of the XML document.
=09
1.		public String getPresentation() {
2.=09
3.			InputSource source =3D new DOMSource(getDocument());
4.			StyleGenerator stylegen =3D new
StyleGenerator(KmpPdfgenConsts.SOURCEDOC_PARSER,KmpPdfgenConsts.STYLESHE=
ET_P
ARSER);
5.=09
6.			try {
7.				return
stylegen.applyStylesheet(source,getStylesheet()).toString();
8.    		} catch(Exception e){
9.				//
10.			}
11.=09
12.			return "";
13.		}


Hope this helps.

Thanks,
Ravi


-----Original Message-----
From: Ted Husted [mailto:husted@apache.org]
Sent: Monday, September 24, 2001 11:33 AM
To: struts-user@jakarta.apache.org
Subject: Re: Struts - XML - XSL


At Jakarta, we use Ant to build our HTML pages from XML and XSL. See =
the
Struts source distribution for an example.=20

I haven't tried it, but I keep thinking it would be interesting to do
the same with JSPs.

This would gives you the flexibility of XML,XLS without changing how =
you
write your applications, or incurring the overhead of the runtime
transformations.

> Fr=E9d=E9ric Houbie - ABSIS-GROUP wrote:
>=20
> Hi,
>=20
> I'm involved in a project that use struts. I have a question to get
> some advice from you. The application want to separate clearly layout
> from the logic. The team manager want us to use XML, XSL to build =
html
> pages. But I don't see clearly how to mix all that. I have beans that
> do SQL query and return an iterator with the data, I suppose my
> controller servlet must call the beans and give the jsp access to =
this
> iterator. My JSP page will dynamically build XML file, but i don't
> know how to call the transformation of the XML data with a XSL file =
to
> build my final html layout.
>=20
> Can you help me ?
>=20
>=20
> Fr=E9d=E9ric Houbie
> Internet Project Manager
>=20
> ABSIS-GROUP SA
> Centre Socran
> Av Pr=E9 Aily, 8
> B-4031 Angleur
> Tel : +32 4 367 89 64
> Fax : +32 4 367 89 63
>=20
> **** DISCLAIMER ****
>=20
> "This e-mail and any attachments thereto may contain information =
which
> is confidential and/or protected by intellectual property rights and
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> If you have received this e-mail in error, please notify the sender
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>=20
> Thank you for your cooperation."

-- Ted Husted, Husted dot Com, Fairport NY USA.
-- Custom Software ~ Technical Services.
-- Tel +1 716 737-3463
-- http://www.husted.com/about/struts/