Java HTML / XML How to - Get DOCTYPE details using SAX (JDK 7)

Question

We would like to know how to get DOCTYPE details using SAX (JDK 7).

Answer

import java.io.StringReader;
/*from  ww w.j  a v  a 2  s.c o  m*/
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.ext.DefaultHandler2;

public class Main {

  public static void main(String[] args) throws Exception {
    String xml = "<!DOCTYPE html><hml><img/></hml>";
    SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
    InputSource in = new InputSource(new StringReader(xml));

    DefaultHandler2 myHandler = new DefaultHandler2() {
      @Override
      public void startElement(String uri, String localName, String qName,
          Attributes attributes) throws SAXException {
        System.out.println("Element: " + qName);
      }

      @Override
      public void startDTD(String name, String publicId, String systemId)
          throws SAXException {
        System.out.println("DocType: " + name);
      }
    };
    saxParser.setProperty("http://xml.org/sax/properties/lexical-handler",
        myHandler);
    saxParser.parse(in, myHandler);
  }
}