fibonacciattributedom.java

随书的代码

import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.math.BigInteger;


public class FibonacciAttributeDOM {

  public static void main(String[] args) {

    try {

      // Find the implementation
      DocumentBuilderFactory factory 
       = DocumentBuilderFactory.newInstance();
      factory.setNamespaceAware(true);
      DocumentBuilder builder = factory.newDocumentBuilder();
      DOMImplementation impl = builder.getDOMImplementation();
      
      // Create the document
      Document doc = impl.createDocument(null, 
       "Fibonacci_Numbers", null);
       
      // Fill the document
      BigInteger low  = BigInteger.ONE;
      BigInteger high = BigInteger.ONE;

      Element root = doc.getDocumentElement();

      for (int i = 0; i < 10; i++) {
        Element number = doc.createElement("fibonacci");
        String value = Integer.toString(i);
        number.setAttribute("index", value);
        Text text = doc.createTextNode(low.toString());
        number.appendChild(text);
        root.appendChild(number);

        BigInteger temp = high;
        high = high.add(low);
        low = temp;
      }

      // Serialize the document onto System.out
      TransformerFactory xformFactory 
       = TransformerFactory.newInstance();  
      Transformer idTransform = xformFactory.newTransformer();
      Source input = new DOMSource(doc);
      Result output = new StreamResult(System.out);
      idTransform.transform(input, output);
      
    }
    catch (FactoryConfigurationError e) { 
      System.out.println("Could not locate a JAXP factory class"); 
    }
    catch (ParserConfigurationException e) { 
      System.out.println(
        "Could not locate a JAXP DocumentBuilder class"
      ); 
    }
    catch (DOMException e) {
      System.err.println(e); 
    }
    catch (TransformerConfigurationException e) {
      System.err.println(e); 
    }
    catch (TransformerException e) {
      System.err.println(e); 
    }
    
  }

}