java xml parser - The SAXParser

The SAXParser uses a Handler to go over each node and output the associated name and value at your discretion. You may modify the Handler to make it send you the parsed result in a different way.

If you get compile time warnings such as "warning: com.sun.org.apache.xerces.internal.parsers.SAXParser is Sun proprietary API and may be removed in a future release", you may consider use the SAXParser and the DocumentBuilder in the java.xml.parsers package.

import java.xml.parsers.SAXParser;
import java.xml.parsers.SAXParserFactory;

public class XMLParser {

    public void saxParse(String xmlStr) {
        try {
            InputSource source = new InputSource(new StringReader(xmlStr));
            SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
            MyHandler dHandler = new MyHandler();
            parser.parse(source, dHandler);
        } catch (ParserConfigurationException e) {
            e.printStackTrace(System.out);
        } catch (SAXException e) {
            e.printStackTrace(System.out);
        } catch (IOException e) {
            e.printStackTrace(System.out);
        }
    }

    private class MyHandler extends DefaultHandler {
        boolean isName = false;
        boolean isPrice = false;
     
        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes)
                throws SAXException {
            if (qName.equalsIgnoreCase("store")) {
                String value = attributes.getValue("name");
                System.out.println("Node name : "+qName+"; value: " + value);
            } else if (qName.equalsIgnoreCase("fruit")) {
                System.out.println("  "+qName);
            } else if (qName.equalsIgnoreCase("name")) {
                isName = true;
            } else if (qName.equalsIgnoreCase("price")) {
                isPrice = true;
            }
        }

        @Override
        public void endElement(String uri,
                String localName, String qName) throws SAXException {
            if (qName.equalsIgnoreCase("fruit")) {
                System.out.println("End Element :" + qName);
            }
        }

        @Override
        public void characters(char[] ch,
                int start, int length) throws SAXException {
            if (isName) {
                System.out.println("Name: "+ new String(ch, start, length));
                isName = false;
            } else if (isPrice) {
                System.out.println("Price: " + new String(ch, start, length));
                isPrice = false;
            }
        }
    }

    public static void main(String[] args) {
        StringBuilder xml = new StringBuilder();
        xml.append("<store name='Deliciously Healthy'>")
                .append("<fruit>")
                .append("<name>Apple</name><price>1.68</price>")
                .append("</fruit><fruit>")
                .append("<name>Orange</name><price>0.89</price>")
                .append("</fruit>")
                .append("</store>");

        XMLParser xmlParser = new XMLParser();
        xmlParser.saxParse(xml.toString());
    }
}

The output:
Node name : store; value: Deliciously Healthy
  fruit
Name: Apple
Price: 1.68
End Element :fruit
  fruit
Name: Orange
Price: 0.89
End Element :fruit

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