<!--test.xml--!><?xml version="1.0" encoding="UTF-8"?><HD>  <disk name="C">    <capacity>8G</capacity>    <directories>200</directories>    <files>1580</files>  </disk>  <disk name="D">    <capacity>10G</capacity>    <directories>500</directories>    <files>3000</files>  </disk></HD> 

//sample.javaimport java.util.*;import org.jdom.*;import org.jdom.input.SAXBuilder;public class Sample {  public static void main(String[] args) throws Exception{     SAXBuilder sb=new SAXBuilder();        Document doc=sb.build(Sample.class.getClassLoader().getResourceAsStream("test.xml")); //构造文档对象    Element root=doc.getRootElement(); //获取根元素HD    List list=root.getChildren("disk");//取名字为disk的所有元素    for(int i=0;i<list.size();i++){       Element element=(Element)list.get(i);       /*String id=element.getAttributeValue("id");       String clazz=element.getAttributeValue("class");       System.out.println(id);       System.out.println(clazz);*/              String name=element.getAttributeValue("name");       String capacity=element.getChildText("capacity");//取disk子元素capacity的内容       String directories=element.getChildText("directories");       String files=element.getChildText("files");       System.out.println("磁盘信息:");       System.out.println("分区盘符:"+name);       System.out.println("分区容量:"+capacity);       System.out.println("目录数:"+directories);       System.out.println("文件数:"+files);       System.out.println("-----------------------------------");           }    }} 

public class ClassPathXmlApplicationContext implements BeanFactory {    private Map<String, Object> beans=new HashMap<String, Object>();        public ClassPathXmlApplicationContext() throws Exception{        SAXBuilder sBuilder=new SAXBuilder();                Document document=sBuilder.build(this.getClass().getClassLoader().getResourceAsStream("beans.xml"));        Element root=document.getRootElement();        List list=root.getChildren("bean");        for(int i=0;i<list.size();i++){            Element element=(Element)list.get(i);            String id=element.getAttributeValue("id");            String clazz=element.getAttributeValue("class");                        Object o=Class.forName(clazz).newInstance();            System.out.println(id);            System.out.println(clazz);            beans.put(id, o);                        for(Element propertyElement : (List<Element>)element.getChildren("property")) {                   String name = propertyElement.getAttributeValue("name"); //userDAO                   String bean = propertyElement.getAttributeValue("bean"); //u                   Object beanObject = beans.get(bean);//UserDAOImpl instance                                      String methodName = "set" + name.substring(0, 1).toUpperCase() + name.substring(1);                   System.out.println("method name = " + methodName);                   //反射机制                   Method m = o.getClass().getMethod(methodName, beanObject.getClass().getInterfaces()[0]);                   m.invoke(o, beanObject);               }                  }    }    public Object getBean(String id){        return beans.get(id);            }}