How to validate a XML file using XSD schema file simple example (JAVA)


 

Here is a sample XML file;

<?xml version=”1.0″ encoding=”UTF-8″?>
<?xml-stylesheet type=”text/xsl” href=”bank.xsl”?>
<bnk:Bank
xmlns:bnk=”http://www.tunatore.wordpress.com/bank
xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance
xsi:schemaLocation=”http://www.tunatore.wordpress.com/bank bank.xsd”>

    <bnk:BankName>IT Bank of Turkey</bnk:BankName>
    <bnk:Branch>
        <bnk:branchID>11111</bnk:branchID>
        <bnk:branchName>Istanbul Branch</bnk:branchName>
        <bnk:branchLocation>Istanbul</bnk:branchLocation>
    </bnk:Branch>

    <bnk:Branch>
        <bnk:branchID>12345</bnk:branchID>
        <bnk:branchName>New York Branch</bnk:branchName>
        <bnk:branchLocation>New York</bnk:branchLocation>
    </bnk:Branch>

    <bnk:Branch>
        <bnk:branchID>222222</bnk:branchID>
        <bnk:branchName>Miami Branch</bnk:branchName>
        <bnk:branchLocation>Miami</bnk:branchLocation>
    </bnk:Branch>

    <bnk:Employee>
        <bnk:employeeID>12345678</bnk:employeeID>
        <bnk:name>Tuna</bnk:name>
        <bnk:surname>TORE</bnk:surname>
        <bnk:profession>IOC Advocate, Abstract Developer</bnk:profession>
    </bnk:Employee>

    <bnk:Employee>
        <bnk:employeeID>987654321</bnk:employeeID>
        <bnk:name>James</bnk:name>
        <bnk:surname>Gosling</bnk:surname>
        <bnk:profession>Java GURU</bnk:profession>
    </bnk:Employee>

    <bnk:Employee>
        <bnk:employeeID>11111111</bnk:employeeID>
        <bnk:name>Linus</bnk:name>
        <bnk:surname>Torvalds</bnk:surname>
        <bnk:profession>Linux GURU</bnk:profession>
    </bnk:Employee>
   
</bnk:Bank>

XSD file (bank.xsd) for validating the XML (bank.xml)

<?xml version=”1.0″ encoding=”UTF-8″?>
<schema targetNamespace=”http://www.tunatore.wordpress.com/bank
elementFormDefault=”qualified”
xmlns=”http://www.w3.org/2001/XMLSchema
xmlns:bnk=”http://www.tunatore.wordpress.com/bank“>

    <element name=”Bank” type=”bnk:BankType”></element>
    <complexType name=”EmployeeType”>
     <sequence>
      <element name=”employeeID” type=”string”></element>
      <element name=”name” type=”string”></element>
      <element name=”surname” type=”string”></element>
      <element name=”profession” type=”string”></element>
     </sequence>
    </complexType>
  
    <complexType name=”BranchType”>
     <sequence>
      <element name=”branchID” type=”string”></element>
      <element name=”branchName” type=”string”></element>
      <element name=”branchLocation” type=”string”></element>
                <element name=”employee” type=”bnk:EmployeeType” minOccurs=”0″ maxOccurs=”unbounded”></element>
     </sequence>
    </complexType>

    <complexType name=”BankType”>
     <sequence>
                <element name=”BankName” type=”string” minOccurs=”0″ maxOccurs=”1″></element>
                <element name=”Branch” type=”bnk:BranchType” minOccurs=”0″ maxOccurs=”unbounded”></element>
                <element name=”Employee” type=”bnk:EmployeeType” minOccurs=”0″ maxOccurs=”unbounded”></element>
     </sequence>
    </complexType>
     
</schema>

validate method for validating the XML file defined

public static boolean validate() {

        boolean isValid = false;
       
        try {

            //location of the XML file
            File xmlFile = new File(Transformation.class.getResource(“bank.xml”)
                    .getFile().replace(“%20″, ” “));
            //location of the XSD file
            File xsdFile = new File(Transformation.class.getResource(“bank.xsd”)
                    .getFile().replace(“%20″, ” “));

            //Create source objects for XML and XSD files
            Source xmlSource = new StreamSource(xmlFile);
            Source xsdSource = new StreamSource(xsdFile);

            //Create SchemaFactory using XSD file
            SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Schema schema = factory.newSchema(xsdSource);

            //Validator will use xsd  file for validating the XML file
            Validator validator = schema.newValidator();

            // Validate the DOM tree.
            validator.validate(xmlSource);

            isValid = true;
           
        } catch (Exception e) {
            e.printStackTrace(System.out);
        }
       
        if(isValid == true)
        System.out.println(“Document is valid!”);
        else
        System.out.println(“Document is NOT valid!”);
       
        return isValid;
    }

SAMPLE OUTPUT FOR A VALID XML DOCUMENT;

run:
Document is valid!
BUILD SUCCESSFUL (total time: 9 seconds)

SAMPLE OUTPUT FOR AN INVALID XML DOCUMENT;

Use the following invalid XML document

<?xml version=”1.0″ encoding=”UTF-8″?>
<?xml-stylesheet type=”text/xsl” href=”bank.xsl”?>
<bnk:Bank
xmlns:bnk=”http://www.tunatore.wordpress.com/bank
xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance
xsi:schemaLocation=”http://www.tunatore.wordpress.com/bank bank.xsd”>

    <bnk:NOTVALIDTAG>THIS ELEMENT IS NOT VALID</bnk:NOTVALIDTAG>

    <bnk:BankName>IT Bank of Turkey</bnk:BankName>
    <bnk:Branch>
        <bnk:branchID>11111</bnk:branchID>
        <bnk:branchName>Istanbul Branch</bnk:branchName>
        <bnk:branchLocation>Istanbul</bnk:branchLocation>
    </bnk:Branch>

    <bnk:Branch>
        <bnk:branchID>12345</bnk:branchID>
        <bnk:branchName>New York Branch</bnk:branchName>
        <bnk:branchLocation>New York</bnk:branchLocation>
    </bnk:Branch>

    <bnk:Branch>
        <bnk:branchID>222222</bnk:branchID>
        <bnk:branchName>Miami Branch</bnk:branchName>
        <bnk:branchLocation>Miami</bnk:branchLocation>
    </bnk:Branch>

    <bnk:Employee>
        <bnk:employeeID>12345678</bnk:employeeID>
        <bnk:name>Tuna</bnk:name>
        <bnk:surname>TORE</bnk:surname>
        <bnk:profession>IOC Advocate, Abstract Developer</bnk:profession>
    </bnk:Employee>

    <bnk:Employee>
        <bnk:employeeID>987654321</bnk:employeeID>
        <bnk:name>James</bnk:name>
        <bnk:surname>Gosling</bnk:surname>
        <bnk:profession>Java GURU</bnk:profession>
    </bnk:Employee>

    <bnk:Employee>
        <bnk:employeeID>11111111</bnk:employeeID>
        <bnk:name>Linus</bnk:name>
        <bnk:surname>Torvalds</bnk:surname>
        <bnk:profession>Linux GURU</bnk:profession>
    </bnk:Employee>
   
</bnk:Bank>

OUTPUT OF THE PROGRAM

run:
org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element ‘bnk:NOTVALIDTAG’. One of ‘{“http://www.tunatore.wordpress.com/bank”:BankName, “http://www.tunatore.wordpress.com/bank”:Branch, “http://www.tunatore.wordpress.com/bank”:Employee}’ is expected.
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:318)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:417)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3182)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1806)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:705)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:400)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2755)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.jaxp.validation.StreamValidatorHelper.validate(StreamValidatorHelper.java:144)
        at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.validate(ValidatorImpl.java:111)
        at javax.xml.validation.Validator.validate(Validator.java:127)
        at xmlxsltexample.Transformation.validate(Transformation.java:75)
        at xmlxsltexample.Transformation.produceHTMLfromXMLwithXSL(Transformation.java:30)
        at xmlxsltexample.Transformation.main(Transformation.java:22)
Document is NOT valid!
BUILD SUCCESSFUL (total time: 2 seconds)

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