java模擬spring的XML配置ioc功能

代碼：

package test3;


import org.w3c.dom.*;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;

public class move {
	public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException, ClassNotFoundException, IllegalAccessException, InstantiationException, NoSuchFieldException {
		DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
		Document document = documentBuilder.parse("/Users/caohao/IdeaProjects/threadlearn/src/main/resources/test1.xml");
		Element documentElement = document.getDocumentElement();
		NodeList childNodes = documentElement.getChildNodes();
		for (int i = 0; i < childNodes.getLength(); i++) {
			Node item = childNodes.item(i);
			if (item instanceof Element){
				Element element = (Element) item;
				String id = element.getAttribute("id");
				String aClass = element.getAttribute("class");
				Class<?> target = Class.forName(aClass);
				Object newInstance = target.newInstance();
				NodeList property = element.getElementsByTagName("property");
				for (int j = 0; j <property.getLength() ; j++) {
					Node node = property.item(j);
					if (node instanceof Element){
						Element propertyElement = (Element) node;
						String name = propertyElement.getAttribute("name");
						System.out.println(name);
						String value = propertyElement.getAttribute("value");
						System.out.println(value);
						target.getDeclaredField(name).set(newInstance,value);
					}
				}
				beantest beantest = (test3.beantest) newInstance;
				System.out.println(beantest.toString());
			}
		}
	}
 }
class beantest{
	String name;
	String password;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	@Override
	public String toString() {
		return "beantest{" +
				"name='" + name + '\'' +
				", password='" + password + '\'' +
				'}';
	}
}

xml:

<bean id="beantest" class="test3.beantest">
        <property name="name" value="caohao"></property>
        <property name="password" value="sss"></property>
    </bean>