用dom4j解析xml文件

下载dom4j：http://sourceforge.net/projects/dom4j/

然后讲解压后的dom4j-1.6.1.jar文件加到built path里。

在docs文件夹里有入门手册。

Parsing XML

One of the first things you'll probably want to do is to parse an XML document of some kind. This is easy to do in  dom4j . The following code demonstrates how to this.

import java.net.URL;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;

public class Foo {

    public Document parse(URL url) throws DocumentException {
        SAXReader reader = new SAXReader();
        Document document = reader.read(url);
        return document;
    }
}

Using Iterators

A document can be navigated using a variety of methods that return standard Java Iterators. For example

public void bar(Document document) throws DocumentException {

        Element root = document.getRootElement();

        // iterate through child elements of root
        for ( Iterator i = root.elementIterator(); i.hasNext(); ) {
            Element element = (Element) i.next();
            // do something
        }

        // iterate through child elements of root with element name "foo"
        for ( Iterator i = root.elementIterator( "foo" ); i.hasNext(); ) {
            Element foo = (Element) i.next();
            // do something
        }

        // iterate through attributes of root 
        for ( Iterator i = root.attributeIterator(); i.hasNext(); ) {
            Attribute attribute = (Attribute) i.next();
            // do something
        }
     }