A DOM Error Checker: Using DOM for Syntax Checking : DOM Parser « XML « Java Tutorial

1. Java Tutorial
2. XML
3. DOM Parser

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

public class DOMCheck {
  static public void main(String[] arg) {
    boolean validate = true;

    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    dbf.setValidating(validate);
    dbf.setNamespaceAware(true);

    try {
      DocumentBuilder builder = dbf.newDocumentBuilder();
      builder.setErrorHandler(new MyErrorHandler());
      InputSource is = new InputSource("person.xml");
      Document doc = builder.parse(is);
    } catch (SAXException e) {
      System.out.println(e);
    } catch (ParserConfigurationException e) {
      System.err.println(e);
    } catch (IOException e) {
      System.err.println(e);
    }
  }
}

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());
  }
}

//File: person.xml
<?xml version="1.0" standalone="yes"?>

<folks>
    <person>
        <phone>999 555-8888</phone>
        <email>e@yoursite.net</email>
        <name>R, L</name>
    </person>
    <person>
        <phone>333 555-9910</phone>
        <name>V, R</name>
        <email>rv@yoursite.com</email>
    </person>
    <person>
        <name>B, D.</name>
        <email>b@xyz.net</email>
    </person>
    <person>
        <email>c@n.net</email>
        <name>C, X</name>
    </person>
    <person>
        <phone>502 555-2192</phone>
        <name>B, M</name>
    </person>
</folks>

Error: Document is invalid: no grammar found.
Line 3 Column 7
System ID: file:///C:/Java_Dev/eclipse31/Eclipse/person.xml
org.xml.sax.SAXParseException: Document is invalid: no grammar found.