main.java

来自「java 的关于web serive教程」· Java 代码 · 共 61 行

/*
 * Copyright 2004-5 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

import java.io.FileInputStream;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import java.io.FileReader;

import javax.xml.stream.*;
import static javax.xml.stream.XMLStreamConstants.*;
import contact.Contact;

/*
 * Use is subject to the license terms.
 */

/**
 * 
 * 
 * @author Kohsuke Kawaguchi ([e-mail])
 */
public class Main {

    public static void main(String[] args) throws Exception {
        
        String nameToLookFor = args[0];
        
        JAXBContext jaxbContext = JAXBContext.newInstance("contact"); 
        Unmarshaller um = jaxbContext.createUnmarshaller();

        // set up a parser
	XMLInputFactory xmlif = XMLInputFactory.newInstance();
	XMLStreamReader xmlr = 
	    xmlif.createXMLStreamReader(new FileReader("contact.xml"));
 
	// move to the root element and check its name.
        xmlr.nextTag(); 
        xmlr.require(START_ELEMENT, null, "addressBook");

        xmlr.nextTag(); // move to the first <contact> element.
        while (xmlr.getEventType() == START_ELEMENT) {

            // unmarshall one <contact> element into a JAXB Contact object
	    xmlr.require(START_ELEMENT, null, "contact");
            Contact contact = (Contact) um.unmarshal(xmlr);
            if( contact.getName().equals(nameToLookFor)) {
                // we found what we wanted to find. show it and quit now.
                System.out.println("the e-mail address is "+contact.getEmail());
                return;
            }
            if (xmlr.getEventType() == CHARACTERS) {
                xmlr.next(); // skip the whitespace between <contact>s.
	    }
        }
        System.out.println("Unable to find "+nameToLookFor);
    }
}