Java XML Validation using XSD

emp.xml

<?xml version="1.0"?>
<emp>
  <name>apple</name>
  <age>60</age>
  <salary>10</salary>
</emp>

emp.xsd

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">

<xs:simpleType name="name">
    <xs:restriction base="xs:string">
      <xs:maxLength value="10" />
    </xs:restriction>
</xs:simpleType>

<xs:simpleType name="age">
    <xs:restriction base="xs:integer">
      <xs:maxInclusive value="60" />
      <xs:minInclusive value="20" />
    </xs:restriction>
</xs:simpleType>

<xs:simpleType name="salary">
    <xs:restriction base="xs:integer">
      <xs:maxInclusive value="100000" />
      <xs:minInclusive value="20000" />
    </xs:restriction>
</xs:simpleType>

<xs:element name="emp">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="name" type="name"/>
      <xs:element name="age" type="age"/>
      <xs:element name="salary" type="salary"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

</xs:schema>

XSDValidation.java

import javax.xml.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.validation.*;
import java.io.*;
import java.net.*;
import org.xml.sax.*;

public class XSDValidation{
	public static void main(String[] args) throws Exception{
		Source xmlFile = new StreamSource(new File(args[0]));
		SchemaFactory schemaFactory = SchemaFactory
		    .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
		Schema schema = schemaFactory.newSchema(new File(args[1]));
		Validator validator = schema.newValidator();
		try {
		  validator.validate(xmlFile);
		  System.out.println(xmlFile.getSystemId() + " is valid");
		} catch (SAXException e) {
		  System.out.println(xmlFile.getSystemId() + " is NOT valid");
		  System.out.println("Reason: " + e.getMessage());
		}		
	}	
}