XSD - Validazione
Useremo il validatore XSD basato su Java per convalidare students.xml contro il students.xsd.
students.xml
<?xml version = "1.0"?>
<class>
<student rollno = "393">
<firstname>Dinkar</firstname>
<lastname>Kad</lastname>
<nickname>Dinkar</nickname>
<marks>85</marks>
</student>
<student rollno = "493">
<firstname>Vaneet</firstname>
<lastname>Gupta</lastname>
<nickname>Vinni</nickname>
<marks>95</marks>
</student>
<student rollno = "593">
<firstname>Jasvir</firstname>
<lastname>Singh</lastname>
<nickname>Jazz</nickname>
<marks>90</marks>
</student>
</class>
studenti.xsd
<?xml version = "1.0"?>
<xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema">
<xs:element name = 'class'>
<xs:complexType>
<xs:sequence>
<xs:element name = 'student' type = 'StudentType' minOccurs = '0'
maxOccurs = 'unbounded' />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name = "StudentType">
<xs:sequence>
<xs:element name = "firstname" type = "xs:string"/>
<xs:element name = "lastname" type = "xs:string"/>
<xs:element name = "nickname" type = "xs:string"/>
<xs:element name = "marks" type = "xs:positiveInteger"/>
</xs:sequence>
<xs:attribute name = 'rollno' type = 'xs:positiveInteger'/>
</xs:complexType>
</xs:schema>
XSDValidator.java
import java.io.File;
import java.io.IOException;
import javax.xml.XMLConstants;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.xml.sax.SAXException;
public class XSDValidator {
public static void main(String[] args) {
if(args.length !=2){
System.out.println("Usage : XSDValidator <file-name.xsd> <file-name.xml>" );
} else {
boolean isValid = validateXMLSchema(args[0],args[1]);
if(isValid){
System.out.println(args[1] + " is valid against " + args[0]);
} else {
System.out.println(args[1] + " is not valid against " + args[0]);
}
}
}
public static boolean validateXMLSchema(String xsdPath, String xmlPath){
try {
SchemaFactory factory =
SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = factory.newSchema(new File(xsdPath));
Validator validator = schema.newValidator();
validator.validate(new StreamSource(new File(xmlPath)));
} catch (IOException e){
System.out.println("Exception: "+e.getMessage());
return false;
}catch(SAXException e1){
System.out.println("SAX Exception: "+e1.getMessage());
return false;
}
return true;
}
}
Passaggi per convalidare XML rispetto a XSD
Copia il file XSDValidator.java file in qualsiasi posizione, ad esempio E: > java
Copia il file students.xml nella stessa posizione E: > java
Copia il file students.xsd nella stessa posizione E: > java
Compilare XSDValidator.javautilizzando la console. Assicurati di avere JDK 1.5 in poi installato sulla tua macchina e che i classpath siano configurati. Per i dettagli su come usare JAVA, vedere il Tutorial JAVA
E:\java\javac XSDValidator.java
Eseguire XSDValidator con students.xsd e students.xml passato come argomento.
E:\java\java XSDValidator students.xsd students.xml
Verifica l'output
Vedrai il seguente risultato:
students.xml is valid against students.xsd