XML: Validation file XML bởi DTD chạy bằng DOM và SAX ~ Thế Giới Giải Mã

Ở ví dụ này chúng ta chỉ validate bằng DTD không validate bằng XSD.

Chạy hàm main bằng Argument args[] truyền 1 file xml

DTD validate những cái gì ?

DTD kiểm tra các thẻ element có viết đúng hay không.

Cách khai báo internal or external DTD và XSD trong file XML [Xem]

Tìm hiểu về DTD và XSD [Xem]

sinhvien.xml

Java XML 2016

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE people SYSTEM "sinhvien.dtd"> <people> <person ID="001"> <title>MR</title> <name>Ewin Antonio</name> <name>Malik Shabazz</name> <name>Malcolm Little</name> <born>13 May 1955</born> <died>20 February 1915</died> <nationality>american</nationality> <email>antonio@giaima.com</email> </person> <person ID="002"> <title>MR</title> <name>Mahatma Andraw</name> <born>20 October 1863</born> <died>03 January 1958</died> <nationality>Indian</nationality> <email>andraw@giaima.com</email> </person> <person ID="003"> <title>MR</title> <name>John F. Benito</name> <name>JFK</name> <name>Jack Kennedy</name> <born>29 January 1901</born> <died>01 November 1913</died> <nationality>american</nationality> <email>benito@giaima.com</email> </person> </people>

sinhvien.dtd

Java XML 2016

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT people (person+)>
<!ELEMENT person (title, name+, born, died?, nationality*, email*)>
  <!ATTLIST person ID CDATA #REQUIRED>
<!ELEMENT title (#PCDATA)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT born (#PCDATA)>
<!ELEMENT died (#PCDATA)>
<!ELEMENT nationality (#PCDATA)>
<!ELEMENT email (#PCDATA)>

ValidationDOM.java

Java XML 2016

package validationdtd;

import java.io.IOException;
import java.util.logging.*;
import javax.xml.parsers.*;
import org.xml.sax.*;

/**
 *
 * @author Lonely
 */
public class ValidationDOM {

    public void validDOM(String xmlFile) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            factory.setValidating(true);

            DocumentBuilder builder = factory.newDocumentBuilder();
            builder.setErrorHandler(new MyErrorHandler());
            builder.parse(new InputSource("src\\database\\" + xmlFile));

        } catch (ParserConfigurationException ex) {
            Logger.getLogger(ValidationDOM.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SAXException ex) {
            Logger.getLogger(ValidationDOM.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(ValidationDOM.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

ValidationSAX.java

Java XML 2016

package validationdtd;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.*;
import org.xml.sax.*;

/**
 *
 * @author Lonely
 */
public class ValidationSAX {

    public void validSAX(String xmlFile) {

        try {
            SAXParserFactory factory = SAXParserFactory.newInstance();
            factory.setValidating(true);
            factory.setNamespaceAware(true);
            
            SAXParser parser = factory.newSAXParser();
            XMLReader reader = parser.getXMLReader();
            
            reader.setErrorHandler(new MyErrorHandler());
            reader.parse(new InputSource("src\\database\\"+xmlFile));
            
        } catch (ParserConfigurationException ex) {
            Logger.getLogger(ValidationSAX.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SAXException ex) {
            Logger.getLogger(ValidationSAX.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(ValidationSAX.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

MyErrorHandler.java

Java XML 2016

package validationdtd;

import org.xml.sax.*;

public class MyErrorHandler implements ErrorHandler {

    @Override
    public void warning(SAXParseException e) throws SAXException {
        System.out.print("Warning at line " + e.getLineNumber() + ": ");
        System.out.println(e.getMessage());
    }

    @Override
    public void error(SAXParseException e) throws SAXException {
        System.out.print("Error at line " + e.getLineNumber() + ": ");
        System.out.println(e.getMessage());
    }

    @Override
    public void fatalError(SAXParseException e) throws SAXException {
        System.out.print("Fatal error at line " + e.getLineNumber() + ": ");
        System.out.println(e.getMessage());
    }
}

Main.java

Java XML 2016

package validationdtd;

/**
 *
 * @author Lonely
 */
public class Main {

    public static void main(String[] args) {

        ValidationDOM v = new ValidationDOM();
        v.validDOM(args[0]);
        
        ValidationSAX v1 = new ValidationSAX();
        v1.validSAX(args[0]);

    }
}

Tiếp theo ta sẽ chạy project này bằng Arguments truyền 1 tham số vào args[0] như sau:

B1: Đặt con trỏ vào tên project và click chuột phải