mybens.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd"><!-- 使用类构造器实例化 -->      <bean id="refrectShili" class="cn.can.dao.impl.RefrectShili"></bean>
</beans>

package cn.can.myspring;//xml中节点的
//<bean id="refrectShili" class="cn.can.dao.impl.RefrectShili"></bean>对应的类
public class MyBean {private String id;private String className;public MyBean() {super();}public MyBean(String id, String className) {super();this.id = id;this.className = className;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getClassName() {return className;}public void setClassName(String className) {this.className = className;}}

package cn.can.myspring;import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.XPath;
import org.dom4j.io.SAXReader;
import cn.can.myspring.exception.NoIdClassException;public class MyApplicationContext {// 因为bean是多个的private List<MyBean> myBeans = new ArrayList<MyBean>();　　//存储实例化之后的引用private Map<String, Object> singles = new HashMap<String, Object>();// 这里可以传入一个xml,或者传入多个xmlpublic MyApplicationContext() {}public Object getBean(String id) throws NoIdClassException{if(singles.size() <= 0){throw new NoIdClassException("不存在这个类");}Object obj = singles.get(id);if(obj == null){throw new NoIdClassException("不存在这个类");}return obj;}public MyApplicationContext(String fileName) {init(fileName);// 获得xml的信息之后initObject();// 进行实例化<bean
    }// 2.进行实例化private void initObject() {try {if (myBeans != null && myBeans.size() > 0) {// 遍历bean // <xml中的<bean 节点，可以抽象成一个类for (MyBean bean : myBeans) {String id = bean.getId();String clazz = bean.getClassName();if (id != null && !"".equals(id)) {if (clazz != null && !"".equals(clazz)) {// 这个时候进行实例化Class cl = Class.forName(clazz);Object o = cl.newInstance();singles.put(id, o);}}}}} catch (Exception e) {}}public MyApplicationContext(String[] fileNames) {}// 1.进行加载xml，解析xml文件private void init(String fileName) {SAXReader saxReader = new SAXReader();Document document = null;try {URL xmlpath = this.getClass().getClassLoader().getResource(fileName);document = saxReader.read(xmlpath);Map<String, String> nsMap = new HashMap<String, String>();nsMap.put("ns", "http://www.springframework.org/schema/beans");// 加入命名空间XPath xsub = document.createXPath("//ns:beans/ns:bean");// 创建beans/bean查询路径xsub.setNamespaceURIs(nsMap);// 设置命名空间List<Element> beans = xsub.selectNodes(document);// 获取文档下所有bean节点for (Element e : beans) {String id = e.attributeValue("id");// 获取id属性值String clazz = e.attributeValue("class"); // 获取class属性值MyBean myBean = new MyBean(id, clazz);// 得到一个<bean></bean>myBeans.add(myBean);// 将xml中的所有bean都进行解析
            }} catch (Exception e) {}}}