Java HTML / XML How to - Parse XML document with DOM parser, with multiple elements for each tag

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Question

We would like to know how to parse XML document with DOM parser, with multiple elements for each tag.

Answer

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
//  ww w  .  jav  a2  s  .  com
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class Main {

  public static void main(String[] args) throws Exception {
    XPathFactory xpf = XPathFactory.newInstance();
    XPath xPath = xpf.newXPath();
    XPathExpression schoolNameExpression = xPath.compile("SchoolName");
    XPathExpression classNameExpression = xPath
        .compile("Classes/Class/ClassName");

    InputSource inputSource = new InputSource("input.xml");
    NodeList schoolNodes = (NodeList) xPath.evaluate("/Data/Schools/School",
        inputSource, XPathConstants.NODESET);
    for (int x = 0; x < schoolNodes.getLength(); x++) {
      Node schoolElement = schoolNodes.item(x);
      System.out.println(schoolNameExpression.evaluate(schoolElement,
          XPathConstants.STRING));
      NodeList classNames = (NodeList) classNameExpression.evaluate(
          schoolElement, XPathConstants.NODESET);
      for (int y = 0; y < classNames.getLength(); y++) {
        System.out.println(classNames.item(y).getTextContent());
      }
    }
  }
}

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