利用JDOM解析xml文件 - JAVA

利用JDOM解析xml文件
JDOM是一个开源项目，它基于树型结构，利用纯JAVA的技术对XML文档实现解析、生成、序列化以及多种操作。JDOM直接为JAVA 编程服务。它利用更为强有力的JAVA语言的诸多特性（方法重载、集合概念以及映射），把SAX和DOM的功能有效地结合起来。
1.首先新建一个接口和2个类，为后续做准备

[Moveable.java]

[java]

package com.njupt.zhb.test;

public interface Moveable {
void run();
}

package com.njupt.zhb.test;

public interface Moveable {
void run();
}

[Plane.java]

[java]
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 Plane implements Moveable {

@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("飞机在翱翔.....");
}

}

[Train.java]

[java]
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 class Train implements Moveable{

@Override
public void run() {
System.out.println("火车在飞奔....");
}

}
2.新建一个接口，主程序可以调用getBean方法，获得相应的对象。

[java]
package com.njupt.zhb.test;

public interface BeanFactory {
Object getBean(String id);
}

package com.njupt.zhb.test;

public interface BeanFactory {
Object getBean(String id);
}
3.需要解析的xml文件如下：
[html]
< xml version="1.0" encoding="UTF-8" >

id="train"
class="com.njupt.zhb.test.Train">

id="plane"
class="com.njupt.zhb.test.Plane">

< xml version="1.0" encoding="UTF-8" >

id="train"
class="com.njupt.zhb.test.Train">

id="plane"
class="com.njupt.zhb.test.Plane">

4.解析文件的主类，实现了BeanFactory接口。
[java]
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 mapContainer = new HashMap();//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.getAttributeva lue("id");//获得id对应的值
String clazz = bean.getAttributeva lue("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;

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 mapContainer = new HashMap();//用于存放解析出来的id和对象
public ClassPathXmlApplication

利用JDOM解析xml文件 (一)