Convert SAX Parse Information into an XML Document in Java

import java.io.StringReader;
/*ww w  . j av  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.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;

public class Main {
  public static void main(String args[]) throws Exception {
    SAXParserFactory spf = SAXParserFactory.newInstance();
    XMLReader reader = null;
    SAXParser parser = spf.newSAXParser();
    reader = parser.getXMLReader();
    reader.setErrorHandler(new MyErrorHandler());
    reader.setContentHandler(new MyCopyHandler());
    
    StringReader sr = new StringReader("<tag></tag>");
    
    
    //InputSource is = new InputSource("xmlFileName.xml");
    InputSource is = new InputSource(sr);
    reader.parse(is);
  }
}
class MyErrorHandler implements ErrorHandler {
  public void warning(SAXParseException e) throws SAXException {
    show("Warning", e);
    throw (e);
  }

  public void error(SAXParseException e) throws SAXException {
    show("Error", e);
    throw (e);
  }

  public void fatalError(SAXParseException e) throws SAXException {
    show("Fatal Error", e);
    throw (e);
  }

  private void show(String type, SAXParseException e) {
    System.out.println(type + ": " + e.getMessage());
    System.out.println("Line " + e.getLineNumber() + " Column " + e.getColumnNumber());
    System.out.println("System ID: " + e.getSystemId());
  }
}
class MyCopyHandler implements ContentHandler {
  private boolean namespaceBegin = false;

  private String currentNamespace;

  private String currentNamespaceUri;

  private Locator locator;

  public MyCopyHandler() {
  }

  public void setDocumentLocator(Locator locator) {
    this.locator = locator;
  }

  public void startDocument() {
    System.out.println("<?xml version=\"1.0\"?>");
    System.out.println();
  }

  public void endDocument() {
  }

  public void startPrefixMapping(String prefix, String uri) {
    namespaceBegin = true;
    currentNamespace = prefix;
    currentNamespaceUri = uri;
  }

  public void endPrefixMapping(String prefix) {
  }

  public void startElement(String namespaceURI, String localName, String qName, Attributes atts) {
    System.out.println("<" + qName);
    if (namespaceBegin) {
      System.out.print(" xmlns:" + currentNamespace + "=\"" + currentNamespaceUri + "\"");
      namespaceBegin = false;
    }
    for (int i = 0; i < atts.getLength(); i++) {
      System.out.print(" " + atts.getQName(i) + "=\\" + atts.getValue(i) + "\"");
    }
    System.out.print(">");
  }

  public void endElement(String namespaceURI, String localName, String qName) {
    System.out.print("</" + qName + ">");
  }

  public void characters(char[] ch, int start, int length) {
    for (int i = start; i < start + length; i++)
      System.out.print(ch[i]);
  }

  public void ignorableWhitespace(char[] ch, int start, int length) {
    for (int i = start; i < start + length; i++)
      System.out.print(ch[i]);
  }

  public void processingInstruction(String target, String data) {
    System.out.print("<?" + target + " " + data + "?>");
  }

  public void skippedEntity(String name) {
    System.out.print("&" + name + ";");
  }
}