Spring的三种注入方式

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">


<!-- GregorianCalendar extends Calendar -->
<!-- 构造器方法实现 -->
<bean id="calendar1" class="java.util.GregorianCalendar"></bean>


<!-- 静态工厂方法实例化bean -->
<bean id="calendar2" class="java.util.Calendar" factory-method="getInstance" />


<!-- 使用实例工厂方法来实现 -->
<bean id="calendar3" factory-bean="calendar2" factory-method="getTime"></bean>


</beans>