 | | | XML validation using xml schema string | XML validation using xml schema string 2003-01-20 - By Praveen Peddi
Hi all,
Last week I sent an email regarding the xml validation against the schema, but
didn't get any reply. Please reply if any one has answer to my question. Is it
possible to validate an xml document using a schema document (not the schema
url) that is present with in the application. If its not possible, whats the
best way of achieving it. Please read my previous email below.
Thanks
Praveen
Hi all,
I want to validate an xml document with an existing schema. I know there is a
code to do it when the schema is present as a URL. BUt in my case schema is
present with in the application memory (since it is stored in the database) and
that is not the url or on the hard disk.
I have the following method which validates only when the schema is present
externally. Note that the argument Schema is a URL:
public static void DOMValidate(String XMLfile, String Schema){
long startTime = System.currentTimeMillis();
// Instantiate the DOM parser.
DOMParser parser = new DOMParser();
// set the features
try{
parser.setFeature("http://xml.org/sax/features/namespaces",true);
parser.setFeature("http://xml.org/sax/features/validation", true);
parser.setFeature("http://apache.org/xml/features/validation
/schema",true);
parser.setFeature("http://apache.org/xml/features/validation
/schema-full-checking",true);
// convert the xml file name to a URL
String SystemId = null;
try{
SystemId = new File(Schema).toURL().toExternalForm();
} catch(java.net.MalformedURLException ex){
//ex.printStackTrace();
log.error(ex);
}
parser.setProperty("http://apache.org/xml/properties/schema
/external-noNamespaceSchemaLocation",SystemId);
// myErrorHandler is a descendant of ErrorHandler, it should be
set here to be able to catch parse errors
parser.setErrorHandler(new SchemaErrorHandler());
} catch (SAXNotSupportedException ex){
System.out.println("SAXNotSupportedException Exception");
} catch (SAXNotRecognizedException ex){
System.out.println("SAXNotRecognizedException Exception");
}
// parse the xml file, the errorhandler class has callbacks,
// so those will be called automatically there is a parse error
try{
parser.parse(new File(XMLfile).toURL().toExternalForm());
//System.out.println("Parsed Successfully by DOM Parser");
} catch (org.xml.sax.SAXException ex){
//System.out.println("SAXException Exception");
//ex.printStackTrace();
log.error(ex);
} catch (java.io.IOException ex){
System.out.println("IOException Exception");
} finally {
long endTime = System.currentTimeMillis();
//System.out.println("Total time of DOMValidate:"+(endTime-startTime
));
}
}
How can I do the validation if the Schema is the actual schema string not the
url. This looks like a common problem. I assume that its not universal that
schema is not always stored externally.
Any suggestions are appreciated.
Praveen
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<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hi all,</FONT></DIV>
<DIV><FONT face=Arial size=2>Last week I sent an email regarding the xml
validation against the schema, but didn't get any reply. Please reply if
any one has answer to my question. Is it possible to validate an xml document
using a schema document (not the schema url) that is present with in the
application. If its not possible, whats the best way of achieving it. Please
read my previous email below.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks</FONT></DIV>
<DIV><FONT face=Arial size=2>Praveen</FONT></DIV>
<DIV><BR></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT:
#000000 2px solid; MARGIN-RIGHT: 0px">
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2>Hi all,</FONT></DIV>
<DIV><FONT face=Arial size=2>I want to validate an xml document with an
existing schema. I know there is a code to do it when the schema is present
as
a URL. BUt in my case schema is present with in the application memory (since
it is stored in the database) and that is not the url or on the hard
disk.</FONT></DIV>
<DIV><FONT face=Arial size=2>I have the following method which validates only
when the schema is present externally. Note that the argument Schema is a
URL:</FONT></DIV>
<DIV><FONT face=Arial size=2>public static void DOMValidate(String XMLfile,
String Schema){<BR> long startTime =
System.currentTimeMillis();
</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> //
Instantiate the DOM parser.<BR>
DOMParser parser = new DOMParser();</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> //
set
the features<BR>
try{<BR>
parser.setFeature("<A
href='http://xml.org/sax/features/namespaces",true'>http://xml.org/sax
/features/namespaces",true</A>);<BR>
parser.setFeature("<A
href="http://xml.org/sax/features/validation">http://xml.org/sax/features
/validation</A>",
true);<BR>
parser.setFeature("<A
href='http://apache.org/xml/features/validation/schema",true'>http://apache
.org/xml/features/validation/schema",true</A>);<BR>  
;
parser.setFeature("<A
href='http://apache.org/xml/features/validation/schema-full-checking",true'
>http://apache.org/xml/features/validation/schema-full-checking",true</A>);<BR>
// convert the xml file name to a
URL<BR>
String SystemId =
null;<BR>
try{<BR>
SystemId = new
File(Schema).toURL().toExternalForm();<BR>  
;
} catch(java.net.MalformedURLException
ex){<BR>
//ex.printStackTrace();<BR>
log.error(ex);<BR>  
;
}<BR>
parser.setProperty("<A
href='http://apache.org/xml/properties/schema/external
-noNamespaceSchemaLocation",SystemId'>http://apache.org/xml/properties/schema
/external-noNamespaceSchemaLocation",SystemId</A>);<BR>
// myErrorHandler is a descendant of ErrorHandler, it should be set here to
be
able to catch parse
errors<BR>
parser.setErrorHandler(new SchemaErrorHandler());</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> }
catch (SAXNotSupportedException
ex){<BR>
System.out.println("SAXNotSupportedException
Exception");<BR> } catch
(SAXNotRecognizedException
ex){<BR>
System.out.println("SAXNotRecognizedException
Exception");<BR> }</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> //
parse the xml file, the errorhandler class has
callbacks,<BR> // so those will be
called automatically there is a parse
error<BR>
try{<BR>
parser.parse(new
File(XMLfile).toURL().toExternalForm());<BR>
//System.out.println("Parsed Successfully by DOM
Parser");<BR> } catch
(org.xml.sax.SAXException
ex){<BR>
//System.out.println("SAXException
Exception");<BR>
//ex.printStackTrace();<BR>
log.error(ex);<BR> } catch
(java.io.IOException
ex){<BR>
System.out.println("IOException Exception");<BR> } finally
{<BR> long endTime =
System.currentTimeMillis();<BR>
//System.out.println("Total time of
DOMValidate:"+(endTime-startTime));<BR> <BR> }</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> }</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>How can I do the validation if the Schema is the
actual schema string not the url. This looks like a common problem. I assume
that its not universal that schema is not always stored
externally.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Any suggestions are appreciated.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial
size=2>Praveen</FONT></DIV></FONT></DIV></BLOCKQUOTE></BODY></HTML>
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