spring1 selfApplicationContext used
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package junit.test;public class BeanDefinition {private String id;private String className;public BeanDefinition(String id,String className){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 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;public class ItcastClassPathXMLApplicationContext {private List<BeanDefinition> beanDefines = new ArrayList<BeanDefinition>();private Map<String,Object> singletons = new HashMap<String , Object>();public ItcastClassPathXMLApplicationContext(String filename){this.readXML(filename);this.instanceBeans();}/** * 完成bean实例化 */private void instanceBeans() {for(BeanDefinition beanDefinition:beanDefines){try {if(beanDefinition.getClassName()!=null&&!"".equals(beanDefinition.getClassName().trim()))singletons.put(beanDefinition.getId(), Class.forName(beanDefinition.getClassName()).newInstance());} catch (InstantiationException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}/** * 读取xml配置文件 * @param filename */private void readXML(String filename) {// TODO Auto-generated method stubSAXReader 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 element:beans){String id = element.attributeValue("id");//获取id属性String clazz = element.attributeValue("class");//获取class属性BeanDefinition beanDefine = new BeanDefinition(id,clazz);beanDefines.add(beanDefine);}}catch(Exception e){e.printStackTrace();}}public Object getBean(String beanName){return this.singletons.get(beanName);}}package junit.test;import org.junit.BeforeClass;import org.junit.Test;import cn.itcast.service.PersonService;public class SpringTest {@BeforeClasspublic static void setUpBeforeClass() throws Exception {}@Testpublic void instanceSpring(){ItcastClassPathXMLApplicationContext ctx = new ItcastClassPathXMLApplicationContext("beans.xml");PersonService personService = (PersonService)ctx.getBean("personService");personService.save();}}package cn.itcast.service;public interface PersonService {public abstract void save();}package cn.itcast.service.impl;import cn.itcast.dao.PersonDao;import cn.itcast.service.PersonService;public class PersonServiceBean implements PersonService {/* (non-Javadoc) * @see cn.itcast.service.impl.PersonService#save() */public void save(){System.out.println("Iam save()");}}<?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"><bean id="personService" class="cn.itcast.service.impl.PersonServiceBean" ></bean></beans>
