 | | | XML validation using xml schema string | XML validation using xml schema string 2003-01-15 - By Praveen Peddi
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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<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></BODY></HTML>
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