运用Jakarta Common Digester解析XML的简单例子

使用Jakarta Common Digester解析XML的简单例子
Jakarta Commons Digester官方网址
http://commons.apache.org/digester/
其中注意依赖包
BeanUtils和Logging


使用Digester可以帮我们迅速的解析XML并且封装成BEAN对象。

Example xml

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE digester-rules PUBLIC "-//Jakarta Apache //DTD digester-rules XML V1.0//EN"   "digester-rules.dtd"><menu><root title="网址"><node title="QQ" url="http://www.qq.com" ></node><node title="163" url="http://www.163.com" ></node></root></menu>

Beans

import java.util.Vector;/** * @author Kenny *  */public class Menu {private Vector<Root> roots;public Menu() {roots = new Vector<Root>();}public void addRoot(Root root){roots.addElement(root);}public Vector<Root> getRoots() {return roots;}@Overridepublic String toString() {return "Menu [roots=" + roots + "]";}}

import java.util.Vector;/** * @author Kenny *  */public class Root {private String title;private Vector<Node> nodes;public Root() {nodes = new Vector<Node>(10);}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public Vector<Node> getNode() {return nodes;}public void addNode(Node node) {nodes.addElement(node);}@Overridepublic String toString() {return "Root [nodes=" + nodes + ", title=" + title + "]";}}

/** * @author Kenny *  */public class Node {private String title;private String url;public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}@Overridepublic String toString() {return "Node [title=" + title + ", url=" + url + "]";}}

Test Unit

import java.io.IOException;import java.net.URL;import org.apache.commons.digester.Digester;import org.junit.Assert;import org.junit.Test;import org.xml.sax.SAXException;/** * @author Kenny *  */public class TestDigest {@Testpublic void testParse() {URL xmlURL = this.getClass().getClassLoader().getResource("menu.xml");Digester digester = new Digester();digester.setValidating(false);digester.addObjectCreate("menu", Menu.class);digester.addObjectCreate("menu/root", Root.class);digester.addSetProperties("menu/root", "title","title");digester.addSetNext("menu/root", "addRoot");digester.addObjectCreate("menu/root/node", Node.class);digester.addSetProperties("menu/root/node", "title","title");digester.addSetProperties("menu/root/node", "url","url");digester.addSetNext("menu/root/node", "addNode");Menu menu = null;try {System.out.println(xmlURL.getPath());menu = (Menu) digester.parse(xmlURL);} catch (IOException e) {e.printStackTrace();} catch (SAXException e) {e.printStackTrace();}Assert.assertNotNull(menu);System.out.println(menu);}}

其中 digester.addSetProperties 用来获取节点中的属性值。即<root title="网址">。

若是<root><title>网址</title></root>的形式，可以用digester.addBeanPropertySetter方法。

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