Spring IOC 注入类型

注入类型

a)     setter（重要）

<?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.dao.impl.UserDAOImpl">
  </bean>
 
  <bean id="userService" class="com.service.UserService">
   <property name="userDAO" ref="u" />
    
  </bean>
 

</beans>

b)     构造方法

 <bean id="userService" class="com.service.UserService">
   <!--
   <property name="userDAO" ref="u" />
    -->
    <constructor-arg>
     <ref bean="u"/>
    </constructor-arg>

</bean>

c)     接口注入