The spring IOC (Inversion of Control) control inversion

1.spring dependent manner injection

a) is completed by a set dependency injection method (property tab)

<!--               Complete set by implantation method               id: with identity is called out               class: class spring full class name management               property: class attributes               name: attribute name               ref: attribute is implanted with ref               value: attribute String, primitive type and basic type of packaging injection         -->        <bean id="userController" class="com.zhiyou100.kfs.controller.UserController">               <property name="userService" ref="userService"></property>               <property name="name" value="zs"></property>               <- list:! Denote the set ->               <property name="list">                      <list>                             <value>张三</value>                             <value>张四</value>                      </list>               </property>               <!--                      map: Map represented type                      entry：                -->               <property name="map">                      <map>                             <entry key="1" value="张三"></entry>                             <entry key="2" value="张四"></entry>                      </map>               </property>        </bean>        <bean id="userService" class="com.zhiyou100.kfs.service.UserServiceImp"></bean>

 

b) by the constructor dependency injection is completed (constructor-arg tag)

<bean id="hello2" class="com.zhiyou100.kfs.bean.Hellow">               <!--                      2.constructor-arg: injecting property values ​​constructor for a class by                      index：第几个参数 索引从0开始                      name：通过构造方法的参数名为类注入属性值                -->               <constructor-arg index="0" value="张四"/>               <constructor-arg index="1" value="13"/>        </bean>

 

2.spring依赖注入的类型

a)      基本数据类型

b)      对象

c)      List类型，Array类型

d)      Map类型

3.bean的作用域

<!--               scope：bean的作用域，默认为singleton，prototype：原生对象（非单例）         -->        <bean id="hello" class="com.zhiyou100.kfs.bean.Hellow" scope="prototype"/>

 

4.自动注入的方式

<!-- autowire：自动注入的属性               byType：根据userDao属性的类型找与之匹配的 bean               byName：根据属性姓名找与之匹配的bean的id，id和属性名一致         -->        <bean id="uService" class="com.zhiyou100.kfs.bean.UserService" autowire="byName"></bean>

 

5.在spring配置文件中引入属性文件

<!-- spring引入属性文件 ，spring2.5之后               若想引入多个属性文件可以用通配符：*或用多个classpath：        -->        <context:property-placeholder location="classpath:*.properties"/>               <!--spring2.5之前         <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">               <property name="location" value="classpath:my.properties"></property>        </bean> -->

 

6.使用注解的方式

              1.jar包（多加个AOPjar包）

              2.配置包扫描

             

<!-- 包扫描 -->        <context:component-scan base-package="com.zhiyou100.kfs"/>

 

              3.在相应的类上加上注解

                     @Repository(value="userDao")：持久化注解

                     @Service(value="userService")：业务层注解

                     @Controller(value="userController")：控制层注解

                     @Autowired：自动按照类型注入，若有多个类型相同的那么会再按照名称注入

                     @Resource(name="") 自动注入，先按照名称注入，若没有相同名称那么会按照类型注入。它可以指定名称来注入