main.java

JavaeeTutorial5的源代码。

/*
 * Copyright 2007 Sun Microsystems, Inc.
 * All rights reserved.  You may not modify, use,
 * reproduce, or distribute this software except in
 * compliance with  the terms of the License at:
 * http://developer.sun.com/berkeley_license.html
 */


package externalcustomize;

import java.io.FileInputStream;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.*;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

// import java content classes generated by binding compiler
import primer.myPo.*;


public class Main {
    // This sample application demonstrates how to modify a java content
    // tree and marshal it back to a xml data. This example demonstrates
    // customiation within the schema file, po.xsd, and the impact that these 
    // customizations have on the schema derived Java representation.
    public static void main(String[] args) {
        try {
            // create a JAXBContext capable of handling classes generated into
            // the primer.po package
            JAXBContext jc = JAXBContext.newInstance("primer.myPo");

            // create an Unmarshaller
            Unmarshaller u = jc.createUnmarshaller();

            // unmarshal a po instance document into a tree of Java content
            // objects composed of classes from the primer.myPo package.
            JAXBElement poe = (JAXBElement) u.unmarshal(
                        new FileInputStream("po.xml"));
            POType po = (POType) poe.getValue();

            // change the billto address
            USAddress address = po.getBillTo();
            address.setToName("John Bob");
            address.setStreet("242 Main Street");
            address.setCity("Beverly Hills");
            address.setState(USState.CA);
            address.setZipCode(90210);

            USState purchaseState = address.getState();
            ListIterator iter = po.getItems()
                                  .getItem()
                                  .listIterator();

            while (iter.hasNext()) {
                // update to 20% off sale price	
                Items.Item item = (Items.Item) iter.next();
                item.setPrice(item.getPrice().multiply(new BigDecimal("0.80")));

                //Calculate sales tax for specific states
                if (purchaseState == USState.MA) {
                    item.setPrice(
                            item.getPrice().multiply(new BigDecimal("1.05")));
                } else if (purchaseState == USState.CA) {
                    item.setPrice(
                            item.getPrice().multiply(new BigDecimal("1.06")));
                }

                item.setPrice(
                        item.getPrice().setScale(2, BigDecimal.ROUND_DOWN));
            }

            // create a Marshaller and marshal to a file
            Marshaller m = jc.createMarshaller();
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            m.marshal(poe, System.out);
        } catch (JAXBException je) {
            je.printStackTrace();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}