Java HTML / XML How to - Implement ErrorHandler Interface for SAX parser

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Question

We would like to know how to implement ErrorHandler Interface for SAX parser.

Answer

/*from  ww  w  . j ava2  s  . co  m*/
import java.io.StringReader;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;

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());
  }
}

// Installation and Use of an Error Handler in a SAX Parser
public class Main {
  public static String getXMLData(){
    return "<x></a>";
  }
  
  static public void main(String[] arg) throws Exception {
    boolean validate = false;
    validate = true;

    SAXParserFactory spf = SAXParserFactory.newInstance();
    spf.setValidating(validate);

    XMLReader reader = null;
    SAXParser parser = spf.newSAXParser();
    reader = parser.getXMLReader();

    reader.setErrorHandler(new MyErrorHandler());
    InputSource is = new InputSource(new StringReader(getXMLData()));
    reader.parse(is);
  }
}

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