How to Validate XML Against an XSD in Java?

import javax.xml.XMLConstants;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.*;
import java.net.URL;
import org.xml.sax.SAXException;
//import java.io.File; // if you use File
import java.io.IOException;

...

// Define the XSD schema URL
URL schemaFile = new URL("http://host:port/filename.xsd");

// Create a Source object for the XML file to be validated
Source xmlFile = new StreamSource(new File("web.xml"));

// Create a SchemaFactory instance
SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

try {
  // Create a Schema object from the XSD schema
  Schema schema = schemaFactory.newSchema(schemaFile);

  // Create a Validator object from the Schema object
  Validator validator = schema.newValidator();

  // Validate the XML file against the schema
  validator.validate(xmlFile);

  // Print a success message if validation is successful
  System.out.println(xmlFile.getSystemId() + " is valid");
} catch (SAXException e) {
  // Print an error message if validation fails due to an error
  System.out.println(xmlFile.getSystemId() + " is NOT valid reason:" + e);
} catch (IOException e) {
  // Handle IOException if file is not found or cannot be read
}