xml编程

package xml;


//: xml/Person.java
// Use the XOM library to write and read XML
// {Requires: nu.xom.Node; You must install
// the XOM library from http://www.xom.nu }
import nu.xom.*;
import java.io.*;
import java.util.*;


public class Person {
  private String first, last;
  public Person(String first, String last) {
    this.first = first;
    this.last = last;
  }
  // Produce an XML Element from this Person object:
  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;
  }
  // Constructor to restore a Person from an XML Element:
  public Person(Element person) {
    first= person.getFirstChildElement("first").getValue();
    last = person.getFirstChildElement("last").getValue();
  }
  public String toString() { return first + " " + last; }
  // Make it human-readable:
  public static void
  format(OutputStream os, Document doc) throws Exception {
    Serializer serializer= new Serializer(os,"ISO-8859-1");
    serializer.setIndent(4);
    serializer.setMaxLength(60);
    serializer.write(doc);
    serializer.flush();
  }
  public static void main(String[] args) throws Exception {
    List<Person> people = Arrays.asList(
      new Person("Dr. Bunsen", "Honeydew"),
      new Person("Gonzo", "The Great"),
      new Person("Phillip J.", "Fry"));
    System.out.println(people);
    Element root = new Element("people");
    for(Person p : people)
      root.appendChild(p.getXML());
    //文档对象
    Document doc = new Document(root);
    format(System.out, doc);
    format(new BufferedOutputStream(new FileOutputStream(
      "People.xml")), doc);
  }
} /* Output:
[Dr. Bunsen Honeydew, Gonzo The Great, Phillip J. Fry]
<?xml version="1.0" encoding="ISO-8859-1"?>
<people>
    <person>
        <first>Dr. Bunsen</first>
        <last>Honeydew</last>
    </person>
    <person>
        <first>Gonzo</first>
        <last>The Great</last>
    </person>
    <person>
        <first>Phillip J.</first>
        <last>Fry</last>
    </person>
</people>

*///:~

package xml;


//: xml/People.java
// {Requires: nu.xom.Node; You must install
// the XOM library from http://www.xom.nu }
// {RunFirst: Person}
import nu.xom.*;
import java.util.*;
//集成 了一大批人，使person有了ArrayList特性
public class People extends ArrayList<Person> {
  /**
* 
*/
private static final long serialVersionUID = 1L;
/**
* 读取xml的到线性表中
* @param fileName
* @throws Exception
*/
public People(String fileName) throws Exception  {
    Document doc = new Builder().build(fileName);
    Elements elements =
      doc.getRootElement().getChildElements();
    //先得到根目录，在得到子孩子，这里面就有所有
    //元素
    for(int i = 0; i < elements.size(); i++)
      add(new Person(elements.get(i)));
  }
  public static void main(String[] args) throws Exception {
    People p = new People("People.xml");
    System.out.println(p);
  }
} /* Output:
[Dr. Bunsen Honeydew, Gonzo The Great, Phillip J. Fry]
*///:~