java 使用JDOM解析xml文件

package com.njupt.zhb.test;
public interface Moveable {
 void run();
}

package com.njupt.zhb.test;
public class Plane implements Moveable {
 @Override
 public void run() {
  // TODO Auto-generated method stub
  System.out.println("飞机在翱翔.....");
 }
}

package com.njupt.zhb.test;
public class Train implements Moveable{
 @Override
 public void run() {
  System.out.println("火车在飞奔....");
 }

}

package com.njupt.zhb.test;
public interface BeanFactory {
 Object getBean(String id);
}

<?xml version="1.0" encoding="UTF-8"?>
<beans>
 <bean
     id="train"
     class="com.njupt.zhb.test.Train">
 </bean>
 <bean
     id="plane"
     class="com.njupt.zhb.test.Plane">
 </bean>
</beans>

package com.njupt.zhb.test;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;
public class ClassPathXmlApplicationContext implements BeanFactory {
 private Map<String, Object> mapContainer = new HashMap<String, Object>();//用于存放解析出来的id和对象
 public ClassPathXmlApplicationContext(String fileName) throws Exception {
  SAXBuilder sb = new SAXBuilder();
  Document doc = sb.build(this.getClass().getClassLoader()
    .getResourceAsStream(fileName));
  Element root = doc.getRootElement();
  List list = XPath.selectNodes(root, "/beans/bean");//获得此节点下的所有值
  System.out.println(list.size());
  for (int i = 0; i < list.size(); i++) {
   Element bean = (Element) list.get(i);
   String id = bean.getAttributeValue("id");//获得id对应的值
   String clazz = bean.getAttributeValue("class");//获得class对应的值
   Object o = Class.forName(clazz).newInstance();//Java反射机制，根据类名生成对象
   mapContainer.put(id, o);//保存到map中
   System.out.println(id + " " + clazz);
  }
 }
 @Override
 public Object getBean(String id) {
  return mapContainer.get(id);
 }
}

package com.njupt.zhb.test;
public class TestMain {
 public static void main(String[] args) throws Exception {
  BeanFactory f = new ClassPathXmlApplicationContext(
    "com/njupt/zhb/test/sample.xml");
  Object obj1 = f.getBean("train");//获得标签为train的对象
  Moveable m1 = (Moveable)obj1;//接口调用子类
  m1.run();
  // //----------------------
  Object obj2 = f.getBean("plane");
  Moveable m2 = (Moveable) obj2;
  m2.run();

 }
}

2
train com.njupt.zhb.test.Train
plane com.njupt.zhb.test.Plane
火车在飞奔....
飞机在翱翔.....