How Java uses the SAX parser to read XML files

To use the SAX parser to read XML files, you can use Java's built-in 'javax. xml. parsers. SAXParser' class and 'org. xml. sax. helpers. DefaultHandler' class. These classes can be operated by using the Java Standard library without any third-party library. The following is the Java sample code: Firstly, you need to create a custom handler class that implements the 'ContentHandler' interface to handle events in XML files. import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; public class MyHandler extends DefaultHandler { //Mark the name of the currently processed element private String currentElement; //Processing Element Start Event @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { //Mark current element currentElement = qName; } //Handle element end event @Override public void endElement(String uri, String localName, String qName) throws SAXException { //Reset current element tags currentElement = null; } //Handling element content events @Override public void characters(char[] ch, int start, int length) throws SAXException { if (currentElement != null) { //Process element content, such as printing to the console System.out.println("Element: " + currentElement + ", Text: " + new String(ch, start, length)); } } } In this handler, we override the 'startElement', 'endElement', and 'characters' methods to handle different events in XML files, such as element start, element end, and element content events. Next, you can use the SAX parser for file parsing. import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import java.io.File; public class Main { public static void main(String[] args) { try { //Create SAXParser factory instance SAXParserFactory factory = SAXParserFactory.newInstance(); //Create SAXParser instance SAXParser parser = factory.newSAXParser(); //Create a custom handler instance MyHandler handler = new MyHandler(); //Parsing XML files parser.parse(new File("example.xml"), handler); } catch (Exception e) { e.printStackTrace(); } } } In this example, we first create an instance of 'SAXParserFactory', and then use that factory instance to create an instance of 'SAXParser'. Next, we create a custom handler instance and pass it to the 'parse' method. Finally, the parser will automatically call the methods of the handler to handle the events in the XML file. The above is a basic example, and you can extend and modify the processing program and parsing logic according to your own needs. Please ensure to replace 'example. xml' with the actual XML file path.