<?xml version="1.0" encoding="UTF-8" ?>
<!--跟标签beans，里面配置一个又一个的bean子标签，每一个bean子标签都代表一个类的配置-->
<beans><!--id标识对象，class是类的全限定类名--><bean id="orderDao" class="com.customize.spring.dao.impl.OrderDaoImpl"></bean><bean id="stockDao" class="com.customize.spring.dao.impl.StockDaoImpl"></bean><bean id="orderService" class="com.customize.spring.service.impl.OrderServiceImpl"><!--通过set方法注入--><property name="setOrderDao" ref="orderDao"></property><property name="setStockDao" ref="stockDao"></property></bean>
</beans>

public class BeanFactory {/*** 存放对象*/private static Map<String, Object> map = new ConcurrentHashMap<>();/*** 对外提供的接口* @param id* @return*/public static  Object getBean(String id) {return map.get(id);}static {// 只加载一次就是在BeanFactory初始化的时候去加载类// 任务一：读取解析xml，通过反射技术实例化对象并且存储待用（map集合）System.out.println("开始加载Bean对象");// 加载xmlInputStream resourceAsStream = BeanFactory.class.getClassLoader().getResourceAsStream("beans.xml");// 解析xmlSAXReader saxReader = new SAXReader();try {Document document = saxReader.read(resourceAsStream);Element rootElement = document.getRootElement();List<Element> beanList = rootElement.selectNodes("//bean");for (int i = 0; i < beanList.size(); i++) {Element element =  beanList.get(i);// 处理每个bean元素，获取到该元素的id 和 class 属性String id = element.attributeValue("id");String clazz = element.attributeValue("class");// 通过反射技术实例化对象Class<?> aClass = Class.forName(clazz);Object o = aClass.newInstance();// 存储到map中待用map.put(id,o);}// 实例化完成之后维护对象的依赖关系，检查哪些对象需要传值进入，根据它的配置，我们传入相应的值// 有property子元素的bean就有传值需求List<Element> propertyList = rootElement.selectNodes("//property");// 解析property，获取父元素for (int i = 0; i < propertyList.size(); i++) {Element element =  propertyList.get(i);String name = element.attributeValue("name");String ref = element.attributeValue("ref");// 找到当前需要被处理依赖关系的beanElement parent = element.getParent();// 调用父元素对象的反射功能String parentId = parent.attributeValue("id");Object parentObject = map.get(parentId);// 遍历父对象中的所有方法，找到"set" + nameMethod[] methods = parentObject.getClass().getMethods();for (int j = 0; j < methods.length; j++) {Method method = methods[j];// 该方法就是 setAccountDao(AccountDao accountDao)if(method.getName().equalsIgnoreCase(name)) {method.invoke(parentObject,map.get(ref));}}// 把处理之后的parentObject重新放到map中map.put(parentId,parentObject);}System.out.println("加载完毕,Map中的Bean对象个数为:" + map.size());} catch (Exception e) {e.printStackTrace();}}
}

public class OrderServiceImpl implements OrderService {private OrderDao orderDao;private StockDao stockDao;public void setOrderDao(OrderDao orderDao) {this.orderDao = orderDao;}public void setStockDao(StockDao stockDao) {this.stockDao = stockDao;}@Overridepublic void order(Order order) {
//        没有IOC容器的情况下
//        OrderDao orderDao = new OrderDaoImpl();
//        // 保存订单
//        orderDao.save(order);
//
//        //扣除库存
//        StockDao stockDao = new StockDaoImpl();
//        stockDao.subStock(order.getName());// 有IOC容器的基础上orderDao.save(order);//扣除库存stockDao.subStock(order.getName());System.out.println("下单成功");}
}