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Posted to users@tomcat.apache.org by Jerry Malcolm <2n...@gmail.com> on 2013/04/20 20:14:21 UTC
JSTL XML Basic Question
I have been searching for several hours for a basic JSTL answer with no
luck. From what I can tell, JSTL is under the umbrella of Tomcat.
Hopefully someone can help me out.
I simply want to use an existing already-parsed DOM (org.w3c.dom.Document
variable) with JSTL XML tags. In other words, I want to skip the x:parse
step and just tell x:out and all of the other x tags to pull data from my
pre-existing pre-parsed DOM:
Document myDOM; // already built by another part of the code
I understand basic xpath stuff. But I'm not sure how to tell it to use a
standard local java variable for the DOM.
I've tried <x:out select="$myDOM/aaaaa/bbbbb"/> and <x:out
select="${myDOM}/aaaaa/bbbbb"/>
Both give me errors that seem to say it doesn't find a DOM.
Every example I can find always assumes I want to start with a true
non-parsed XML document.
I'm sure I'm missing something obvious. But can someone please help me out
with the correct syntax?
Thanks.
Jerry
Re: JSTL XML Basic Question
Posted by Konstantin Kolinko <kn...@gmail.com>.
2013/4/20 Jerry Malcolm <2n...@gmail.com>:
> I have been searching for several hours for a basic JSTL answer with no
> luck. From what I can tell, JSTL is under the umbrella of Tomcat.
> Hopefully someone can help me out.
>
You are welcome.
> I simply want to use an existing already-parsed DOM (org.w3c.dom.Document
> variable) with JSTL XML tags. In other words, I want to skip the x:parse
> step and just tell x:out and all of the other x tags to pull data from my
> pre-existing pre-parsed DOM:
>
> Document myDOM; // already built by another part of the code
>
1. Have you exposed your Java variable as JspContext attribute?
I mean, pageContext.setAttribute("myDOM", myDOM)?
> I understand basic xpath stuff. But I'm not sure how to tell it to use a
> standard local java variable for the DOM.
>
> I've tried <x:out select="$myDOM/aaaaa/bbbbb"/> and <x:out
> select="${myDOM}/aaaaa/bbbbb"/>
>
2. The first should work.
The second in not valid, neither by JSTL spec, nor by XPath spec.
The latter says,
[36] VariableReference ::= '$' QName
I have not actually tried it, though.
JSTL spec says:
[quote]
An XPath expression must also treat variables that resolve to implementations of
standard DOM interfaces as representing nodes of the type bound to
that interface
by the DOM specification.
[/quote]
1) What is the structure of your document
2) Maybe: try to select a specific XML element and put it into
JspContext's attribute. Then try to output it via <x:out
select="$elem"/>.
> Both give me errors that seem to say it doesn't find a DOM.
>
How this error looks like, exactly, with a stacktrace?
> Every example I can find always assumes I want to start with a true
> non-parsed XML document.
>
> I'm sure I'm missing something obvious. But can someone please help me out
> with the correct syntax?
>
Best regards,
Konstantin Kolinko
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RE: JSTL XML Basic Question
Posted by Martin Gainty <mg...@hotmail.com>.
Jerry
You'll need core taglib and xml taglib e.g. http://www.tutorialspoint.com/jsp/jstl_xml_out_tag.htm
declaration:<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
use core taglib to set var:<c:set var="xmltext">
<books>
<book>
<name>Padam History</name>
<author>ZARA</author>
<price>100</price>
</book>
<book>
<name>Great Mistry</name>
<author>NUHA</author>
<price>2000</price>
</book>
</books>
</c:set>
use xml taglib to set parse var:
<x:parse xml="${xmltext}" var="output"/>
use xml taglib to set output the parsed text<x:out select="$output/books/book[1]/name" />
http://www.tutorialspoint.com/jsp/jstl_xml_out_tag.htm
Martin______________________________________________
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> Date: Sat, 20 Apr 2013 13:14:21 -0500
> Subject: JSTL XML Basic Question
> From: 2ndgenfilms@gmail.com
> To: users@tomcat.apache.org
>
> I have been searching for several hours for a basic JSTL answer with no
> luck. From what I can tell, JSTL is under the umbrella of Tomcat.
> Hopefully someone can help me out.
>
> I simply want to use an existing already-parsed DOM (org.w3c.dom.Document
> variable) with JSTL XML tags. In other words, I want to skip the x:parse
> step and just tell x:out and all of the other x tags to pull data from my
> pre-existing pre-parsed DOM:
>
> Document myDOM; // already built by another part of the code
>
> I understand basic xpath stuff. But I'm not sure how to tell it to use a
> standard local java variable for the DOM.
>
> I've tried <x:out select="$myDOM/aaaaa/bbbbb"/> and <x:out
> select="${myDOM}/aaaaa/bbbbb"/>
>
> Both give me errors that seem to say it doesn't find a DOM.
>
> Every example I can find always assumes I want to start with a true
> non-parsed XML document.
>
> I'm sure I'm missing something obvious. But can someone please help me out
> with the correct syntax?
>
> Thanks.
>
> Jerry
Re: JSTL XML Basic Question
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Hash: SHA256
Jerry,
On 4/20/13 2:14 PM, Jerry Malcolm wrote:
> I have been searching for several hours for a basic JSTL answer
> with no luck. From what I can tell, JSTL is under the umbrella of
> Tomcat.
Nope, but I can understand the confusion.
JSTL is a standard that describes a set of JSP tags. "Jakarta Taglibs"
aka "Apache Taglibs" (found under the Tomcat umbrella) is one
implementation of the JSTL specification. At this point, it's
basically a dead project because apparently nobody cares about it anymore.
I think just about everyone uses Glassfish's implementation:
https://jstl.java.net/
> I simply want to use an existing already-parsed DOM
> (org.w3c.dom.Document variable) with JSTL XML tags. In other
> words, I want to skip the x:parse step and just tell x:out and all
> of the other x tags to pull data from my pre-existing pre-parsed
> DOM:
>
> Document myDOM; // already built by another part of the code
>
> I understand basic xpath stuff. But I'm not sure how to tell it to
> use a standard local java variable for the DOM.
>
> I've tried <x:out select="$myDOM/aaaaa/bbbbb"/> and <x:out
> select="${myDOM}/aaaaa/bbbbb"/>
>
> Both give me errors that seem to say it doesn't find a DOM.
>
> Every example I can find always assumes I want to start with a
> true non-parsed XML document.
>
> I'm sure I'm missing something obvious. But can someone please
> help me out with the correct syntax?
Try using <x:parse> and then dumping-out the (Java) type of the
resulting object. Perhaps JSTL uses something other than a "Document"
object (or maybe you are not naming your reference correctly).
- -chris
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