尚学堂_Spring_0300_IOC_Injection_Type

Spring的三种注入类型：
 1. Setter Injection (Setter注入)
 2. Constructor Injection (构造注入)
 3    接口注入
 
参考：spring-framework-2.5.6-with-dependencies\spring-framework-2.5.6\docs\reference\html_single\index.html 中的3.3.1章节。

具体配置参考如下：

<?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/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

  <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl">
  </bean>
 
  <bean id="userService" class="com.bjsxt.service.UserService">
    <!-- Setter Injection -->
    <!--
    <property name="userDAO" ref="u" />
    -->
   
   <!-- Constructor Injection -->
   <constructor-arg ref="u">  </constructor-arg>
   
   
   
  </bean>
 

</beans>