Java HTML / XML How to - Parse XML to Map

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Question

We would like to know how to parse XML to Map.

Answer

import java.io.StringReader;
/*  w  ww  .ja  v a2s.  c o  m*/
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class Main {
  static String cfgXml = "<configuration> "//
      + "<config name='name1' type='main' format='xyz-D' size='1' scale='2' required='no'/> "//
      + "<config name='name2' type='sub' format='xyz-E' size='12' scale='5' required='no'/> "//
      + "<config name='name3' type='last' format='xyz-C' size='2' scale='1' required='no'/> "//
      + "<config name='name4' type='first' format='xyz-S' size='16' scale='3' required='no'/> "//
      + "<config name='name5' type='main' format='xyz-S' size='17' scale='2' required='no'/> "//
      + "<config name='name6' type='main' format='xyz-S' size='18' scale='2' required='no'/> "//
      + "<config name='name7' type='first' format='xyz-S' size='23' scale='4' required='no'/> "//
      + "<config name='name8' type='last' format='xyz-S' size='45' scale='2' required='no'/> "//
      + "<config name='name9' type='sub' format='xyz-s' size='39' scale='15' required='no'/> "//
      + "</configuration>";

  public static void main(String[] args) throws Exception {
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
    Document doc = dBuilder.parse(new InputSource(new StringReader(cfgXml)));
    doc.getDocumentElement().normalize();

    System.out.println("Root element :"
        + doc.getDocumentElement().getNodeName());

    NodeList nList = doc.getElementsByTagName("config");
    for (int temp = 0; temp < nList.getLength(); temp++) {
      Node nNode = nList.item(temp);
      System.out.println("\nCurrent Element :" + nNode.getNodeName());
      if (nNode.getNodeType() == Node.ELEMENT_NODE) {
        Element eElement = (Element) nNode;
        Config c = new Config();
        c.name = eElement.getAttribute("name");
        c.type = eElement.getAttribute("type");
        c.format = eElement.getAttribute("format");
        c.size = Integer.valueOf(eElement.getAttribute("size"));
        c.scale = Integer.valueOf(eElement.getAttribute("scale"));
        String attribute = eElement.getAttribute("required");
        c.required = Boolean.valueOf("Yes".equalsIgnoreCase(attribute) ? true
            : false);
        System.out.println("Imported config : " + c);
      }
    }
  }
}

class Config {
  @Override
  public String toString() {
    return "Config [name=" + name + ", type=" + type + ", format=" + format
        + ", size=" + size + ", scale=" + scale + ", required=" + required
        + "]";
  }

  public String name;
  public String type;
  public String format;
  public int size;
  public int scale;
  public boolean required;
}

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