IOC
三:
一:控制反转
二:将对象的创建,管理,配置工作交给spring
三:修改配置文件达到修改功能的目的;不在需要修改程序。
依赖注入方式:
一:构造器注入
一:下标赋值
<bean id="wangwu" class="com.nbg.pojo.User"> <!--下标赋值 value:给构造参数赋值-->
<constructor-arg index="0" value="3"/>
<constructor-arg index="1" value="doctor"/>
</bean>
二:类型
<bean id="zhaoliu" class="com.nbg.pojo.User"> <!--类型--> <constructor-arg type="int" value="4"/> <constructor-arg type="java.lang.String" value="criminal"/> </bean>
三:参数名
<bean id="lisi" class="com.nbg.pojo.User" name="lsi"> <!--name:构造参数名称--> <constructor-arg name="id" value="2"/> <constructor-arg name="name" value="teacher"/> </bean>
二:set方式注入
@Data public class Student { private String name; private Address address; private String[] books; private List<String> hobbys; private Map<String, String> card; private Set<String> games; private String wife; private Properties info; } @Data public class Address { private String address; }
<?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 https://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="address" class="com.nbg.pojo.Address"> <property name="address" value="北京"/> </bean> <bean id="zhangsan" class="com.nbg.pojo.Student"> <!--普通注入--> <property name="name" value="老张"/> <property name="address" ref="address"/> <!--数组--> <property name="books"> <array> <value>三国演义</value> <value>红楼梦</value> <value>水浒传</value> <value>西游记</value> </array> </property> <!--map--> <property name="card"> <map> <entry key="id" value="1"/> <entry key="name" value="张三"/> <entry key="count" value="99"/> </map> </property> <!--set--> <property name="games"> <set> <value>lol</value> <value>bob</value> <value>coc</value> </set> </property> <!--list--> <property name="hobbys"> <list> <value>打游戏</value> <value>学习</value> </list> </property> <!--properties--> <property name="info"> <props> <prop key="driver">Driver</prop> <prop key="url">3306/mybatis</prop> <prop key="username">root</prop> <prop key="password">root</prop> </props> </property> <!--null--> <property name="wife"> <null/> </property> </bean>
三:拓展方式注入
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="u" class="com.nbg.pojo.User" p:age="18" p:name="普京"/> <bean id="us" class="com.nbg.pojo.User" c:_0="20" c:_1="梅德韦杰夫"/> </beans>
p:properties 属性命名
c:contstroctor 构造器命名