Java编程思想：XML

/*
    本次实验需要在www.xom.nu上下载XOM类库
 */

import nu.xom.*;

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Test {
    public static void main(String[] args){
        PersonTest.test();
    }
}

class Person {
    private String first;
    private String last;

    public Person(String firstName, String lastName) {
        this.first =firstName;
        this.last=lastName;
    }

    public Person(Element person) {
        first=person.getFirstChildElement("first").getValue();
        last=person.getFirstChildElement("last").getValue();
    }

    public Element getXML() {
        Element person = new Element("person");
        Element firstName = new Element("first");
        firstName.appendChild(first);
        Element lastName = new Element("last");
        lastName.appendChild(last);
        person.appendChild(firstName);
        person.appendChild(lastName);
        return person;
    }

    public String toString() {
        return first+" "+last;
    }

    public static void format(OutputStream os, Document doc) throws IOException {
        Serializer serializer = new Serializer(os, "ISO-8859-1");
        serializer.setIndent(4);
        serializer.setMaxLength(60);
        serializer.write(doc);
        serializer.flush();
    }

}

class People extends ArrayList<Person> {
    public People(String fileName) throws ParsingException, IOException {
        Document doc = new Builder().build(fileName);
        Elements elements = doc.getRootElement().getChildElements();
        for(int i =0;i<elements.size();i++){
            add(new Person(elements.get(i)));
        }
    }
}

class PersonTest{
    public static void test(){
//        testToXML();
        testFromXML();
    }
    public static void testToXML() {
        List<Person> persons = Arrays.asList(
                new Person("A","a"),
                new Person("B","b"),
                new Person("C","c")
        );

        System.out.println(persons);

        Element root = new Element("people");
        for (Person p : persons) {
            root.appendChild(p.getXML());
        }
        Document doc = new Document(root);

        try {
            Person.format(System.out,doc);
            Person.format(new BufferedOutputStream(
                    new FileOutputStream("People.xml")),doc);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void testFromXML() {
        try {
            People p = new People("People.xml");
            System.out.println(p);
        } catch (ParsingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}