1: 首先我们要利用dom4j进行xml的解析，将所有的bean的配置读取出来。
2：利用java的反射机制进行对象的实例化。
3： 直接获得对象
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package cn.Junit.test;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 org.springframework.beans.factory.config.BeanDefinition;public
class MyClassPathXmlApplicationContext { private
String filemame; private
List<DefBean> list = new
ArrayList<DefBean>(); private
Map<String, Object> singletons = new
HashMap<String, Object>(); public
MyClassPathXmlApplicationContext() { super(); // TODO Auto-generated constructor stub } public
MyClassPathXmlApplicationContext(String filemame) { //1. 读取XML配置文件 this.readXML(filemame); //2.实例化对象 this.instanceBean(); } private
void instanceBean() { for
(DefBean bean : list) { try
{ singletons.put(bean.getId(), Class.forName(bean.getClassName()).newInstance()); } catch
(Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } private
void readXML(String filemame) { SAXReader saxReader = new
SAXReader(); Document document = null; try
{ URL xmlpath = this.getClass().getClassLoader() .getResource(filemame); document = saxReader.read(xmlpath); Map<String, String> nsMap = new
HashMap<String, String>(); 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 element : beans) { String id = element.attributeValue("id");// 获取id属性值 String clazz = element.attributeValue("class"); // 获取class属性值 DefBean bean = new
DefBean(id, clazz); list.add(bean); } } catch
(Exception e) { e.printStackTrace(); } } //3. 获得bean对象 public
Object getBean(String key) { return
singletons.get(key); }} |
原文：http://www.cnblogs.com/E-star/p/3556964.html