Spring IOC注入的方法主要有两种
1：设值注入
2：构造注入
简单来说一个是调用set方法设值，一个是通过构造函数设值
Spring-ioc.xml
<?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.xsd" default-init-method= "init" default-destroy-method= "destroy"> <!-- <bean id="InjectionService" class="Main.InjectionServiceImpl"> <property name="injectionDAO" ref="InjectionDAO"></property> </bean> --> <bean id="InjectionService" class="Main.InjectionServiceImpl"> <constructor-arg name="injectionDAO" ref="InjectionDAO"></constructor-arg> </bean> <bean id="InjectionDAO" class= "Main.InjectionDAOImpl"> </bean> </beans>
原文：https://www.cnblogs.com/wjune-0405/p/12148750.html