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SaxXmlXsValidation.java - SAX Parser with XS Validation
How to parse an XML file with XS (XML Schema) validation using the SAX API?
✍: FYIcenter
if you want to parse an XML file with XS (XML Schema) validation using the SAX API,
you can follow these suggestions:
1. Set the validation flag to true on SAXParserFactory object:
SAXParserFactory f = SAXParserFactory.newInstance(); f.setValidating(Boolean.parseBoolean(args[1]));
2. Turn Schema Validation on and Namespace Awareness on:
f.setNamespaceAware(true); f.setFeature("http://apache.org/xml/features/validation/schema",true);
3. Provide the XML file with XML Schema location (User.xsd) provided, UserXsdError.xml:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!-- Copyright (c) 2017 FYIcenter.com --> <fyi:User xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:fyi="http://fyicenter.com" xsi:schemaLocation="http://fyicenter.com User.xsd"> <fyi:ID>ONE</fyi:ID> <fyi:Name>Frank Y. Ivy</fyi:Name> <fyi:BirthDate>1970-01-01+00:01</fyi:BirthDate> <fyi:Sex> Male</fyi:Sex> </fyi:User>
Here is a complete example of parsing an XML with DTD validation using SAX API, SaxXmlXsValidation.java:
// Copyright (c) 2017 FYIcenter.com import javax.xml.parsers.SAXParserFactory; import javax.xml.parsers.SAXParser; import org.xml.sax.helpers.DefaultHandler; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import java.io.*; public class SaxXmlXsValidation extends DefaultHandler { static String dot = "............................................................"; static int l = 0; public static void main(String[] args) throws Exception { SAXParserFactory f = SAXParserFactory.newInstance(); f.setNamespaceAware(true); f.setValidating(Boolean.parseBoolean(args[1])); f.setFeature("http://apache.org/xml/features/validation/schema",true); SAXParser p = f.newSAXParser(); System.out.println("Parser class: "+p.getClass().getName()); p.parse(new File(args[0]), new SaxXmlXsValidation()); } public void startElement(String uri, String lName, String qName, Attributes atts) { l++; System.out.print("\n"+dot.substring(0,l)+lName+qName); } public void endElement(String uri, String lName, String qName) { l--; } public void characters(char[] ch, int start, int length) { System.out.print("("+(new String(ch,start,length))+")"); } public void error(SAXParseException e) throws SAXException { System.out.println("\nError: "+e.toString()); } }
Compile and run the example program, SaxXmlXsValidation.java:
>\fyicenter\jdk-1.8.0\bin\javac SaxXmlXsValidation.java >\fyicenter\jdk-1.8.0\bin\java SaxXmlXsValidation UserXsdError.xml true Parser class: com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl .Userfyi:User ..IDfyi:ID(ONE) Error: org.xml.sax.SAXParseException; systemId: file:UserXsdError.xml; lineNumber: 6; columnNumber: 25; cvc-datatype-valid.1.2.1: 'ONE' is not a valid value for 'integer'. Error: org.xml.sax.SAXParseException; systemId: file:UserXsdError.xml; lineNumber: 6; columnNumber: 25; cvc-type.3.1.3: The value 'ONE' of element 'fyi:ID' is not valid. ..Namefyi:Name(Frank Y. Ivy) ..BirthDatefyi:BirthDate(1970-01-01+00:01) Error: org.xml.sax.SAXParseException; systemId: file:UserXsdError.xml; lineNumber: 8; columnNumber: 52; cvc-datatype-valid.1.2.1: '1970-01-01+00:01' is not a valid value for 'dateTime'. Error: org.xml.sax.SAXParseException; systemId: file:UserXsdError.xml; lineNumber: 8; columnNumber: 52; cvc-type.3.1.3: The value '1970-01-01+00:01' of element 'fyi:BirthDate' is not valid. ..Sexfyi:Sex(Male)
If you run it again with "false", you will not see any validation errors:
>\fyicenter\jdk-1.8.0\bin\java SaxXmlXsValidation UserXsdError.xml false Parser class: com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl .Userfyi:User ..IDfyi:ID(ONE) ..Namefyi:Name(Frank Y. Ivy) ..BirthDatefyi:BirthDate(1970-01-01+00:01) ..Sexfyi:Sex(Male)
The XML Schema file used in the above test is, User.xsd:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!-- Copyright (c) 2017 FYIcenter.com --> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:fyi="http://fyicenter.com" targetNamespace="http://fyicenter.com" elementFormDefault="qualified"> <xsd:element name="User"> <xsd:complexType> <xsd:sequence> <xsd:element name="ID" type="xsd:integer"/> <xsd:element name="Name" type="xsd:string"/> <xsd:element name="BirthDate" type="xsd:dateTime"/> <xsd:element name="Sex" type="fyi:sexType"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:simpleType name="sexType"> <xsd:restriction base="xsd:NMTOKEN"> <xsd:enumeration value="Male"/> <xsd:enumeration value="Femal"/> </xsd:restriction> </xsd:simpleType> </xsd:schema>
⇒ Using Apache Xerces DOM Sample Programs
⇐ SaxXmlDtdValidation.java - SAX Parser with DTD Validation
2017-12-04, 1486👍, 0💬
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