Spring第二节 注入依赖

set方法注入依赖

<?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">
<!--注入userdao-->
    <bean id="userDao" class="com.jc.dao.impl.UserDaoImpl" scope="singleton"> </bean>
<!--    注入userservice-->
    <bean id="userService" class="com.jc.service.impl.UserServiceImpl" scope="singleton">
<!--把userdao注入到userservice中-->
        <property name="userDao" ref="userDao"></property>
<!--            name标签为userservice类的setUserDao函数的后去除set 首字母小写的值 ref为被注入的id-->
    </bean>
</beans>

构造方法注入依赖

<?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">
<!--注入userdao-->
    <bean id="userDao" class="com.jc.dao.impl.UserDaoImpl" scope="singleton"> </bean>
<!--    注入userservice-->
    <bean id="userService" class="com.jc.service.impl.UserServiceImpl" scope="singleton">
<!--把userdao注入到userservice中-->
        <constructor-arg name="userDao" ref="userDao"></constructor-arg>
<!--        构造函数注入依赖 name为构成函数参数 ref为被注入的id-->
    </bean>
</beans>

依赖中注入普通参数

<bean id="userDao" class="com.jc.dao.impl.UserDaoImpl" scope="singleton">
        <property name="username" value="jc"></property>
<!--        注入普通参数 name为set函数后面的-->
    </bean>

在userdao中注入list集合

<!--  注入在userdao中特殊参数  -->
    <bean id="userDao" class="com.jc.dao.impl.UserDaoImpl" scope="singleton">
        <!--  注入list参数 此list是string普通类型 则为value 引用可以用ref  -->
        <property name="stringList">
<!--            name为set方法的-->
        <list>
            <value>1</value>
            <value>a</value>
            <value>三</value>
        </list>
    </property>

    </bean>

ref引用只能引用被注入的依赖

注入map

 <bean>  
  </property>
        <property name="userMap">
            <!--            name为set方法的-->
            <map>
                <entry key="user1" value-ref="user1"></entry>
                <entry key="user2" value-ref="user2"></entry>
<!--                ref引用当前页面的id 也就是被注入的依赖 key自定义 -->
            </map>
        </property>
    </bean>

注入properties

     <property name="properties">
            <props>
                <prop key="p1"> 1111</prop>
                <prop key="p2"> 2111</prop>
                <prop key="p3"> 3111</prop>
            </props>
        </property>