TestingServlet.java

package test;


import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.StandardCharsets;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.xml.sax.SAXException;


/*
 * A blank servlet to make it easy to quickly test code snippets. For developers use.
 */
public class TestingServlet extends HttpServlet {

	String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><computer><keyboard>105 keys</keyboard><mouse>3 button</mouse><monitor>vga</monitor></computer>";

	static URL xsdPath;

	@Override public void init(ServletConfig config) throws ServletException {
		super.init(config);
		try {
		xsdPath = config.getServletContext().getResource("/WEB-INF/test.xsd");
		} catch (MalformedURLException e) {
			throw new ServletException("Exception during servlet initilization!", e);
		}
	}

	@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    	try {
		SchemaFactory factory = SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema");
		Schema schema = factory.newSchema(xsdPath);
		Validator validator = schema.newValidator();
		Source source = new StreamSource(new StringReader(xml));
		validator.validate(source);


		InputStream stream = new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8));

		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		dbf.setNamespaceAware(true);
		DocumentBuilder builder = dbf.newDocumentBuilder();
		Document doc = builder.parse(stream);
		XPathFactory xpf = XPathFactory.newInstance();
		XPath xpath = xpf.newXPath();

    	} catch (SAXException | ParserConfigurationException e) {
    		throw new ServletException("Exception during testing!", e);
    	}
	}
}