使用DOM验证XML文件格式

package com;

import java.io.File;
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.SAXException;
import org.xml.sax.SAXParseException;

class DOMValidator {
public static void main(String[] args) {
try {
String fileName = "conf/invalid_dtd2.xml";
File x = new File(fileName);
DocumentBuilderFactory f = DocumentBuilderFactory.newInstance();
f.setValidating(true); // Default is false
DocumentBuilder b = f.newDocumentBuilder();
// ErrorHandler h = new DefaultHandler();
ErrorHandler h = new MyErrorHandler();
b.setErrorHandler(h);
Document d = b.parse(x);
} catch (ParserConfigurationException e) {
System.out.println(e.toString());
} catch (SAXException e) {
System.out.println(e.toString());
} catch (IOException e) {
System.out.println(e.toString());
}
}

private static class MyErrorHandler implements ErrorHandler {
public void warning(SAXParseException e) throws SAXException {
System.out.println("Warning: ");
printInfo(e);
}

public void error(SAXParseException e) throws SAXException {
System.out.println("Error: ");
printInfo(e);
}

public void fatalError(SAXParseException e) throws SAXException {
System.out.println("Fattal error: ");
printInfo(e);
}

private void printInfo(SAXParseException e) {
System.out.println("   Public ID: " + e.getPublicId());
System.out.println("   System ID: " + e.getSystemId());
System.out.println("   Line number: " + e.getLineNumber());
System.out.println("   Column number: " + e.getColumnNumber());
System.out.println("   Message: " + e.getMessage());
}
}
}