day121 - 依赖注入的几种方式（2）

依赖注入的几种方式

为数组类型属性赋值

直接配置property中的array属性

<bean id="studentFive" class="com.gu.spring.pojo.Student">
    <property name="sid" value="1003"></property>
    <property name="sname" value="lisi"></property>
    <property name="age" value="23"></property>
    <property name="gender" value="男"></property>
    <property name="hobby">
        <array>
            <value>抽烟</value>
            <value>喝酒</value>
            <value>烫头</value>
        </array>
    </property>
</bean>

 

为集合属性赋值

为list属性赋值

<bean id="clazzOne" class="com.gu.spring.pojo.Clazz">
    <property name="cid" value="1111"></property>
    <property name="cname" value="最强王者班"></property>
    <property name="students" ref="studentList"></property>
            <property name="students">
                <list>
                    <ref bean="studentOne"></ref>
                    <ref bean="studentTwo"></ref>
                    <ref bean="studentThree"></ref>
                </list>
            </property>
</bean>

 

若为Set集合类型属性赋值，只需要将其中的list标签改为set标签即可

为map属性赋值

<property name="teacherMap" ref="teacherMap"></property>
        <property name="teacherMap">
            <map>
                <entry key="10086" value-ref="teacherOne"></entry>
                <entry key="10087" value-ref="teacherTwo"></entry>
            </map>
        </property>

 

引用集合类型的bean

<!--    配置一个集合类型的bean需要使用util的约束  -->
<util:list id="studentList">
    <ref bean="studentOne"></ref>
    <ref bean="studentTwo"></ref>
    <ref bean="studentThree"></ref>
</util:list>
<bean id="teacherOne" class="com.gu.spring.pojo.Teacher">
    <property name="tid" value="10086"></property>
    <property name="tname" value="yiyi"></property>
</bean>
<bean id="teacherTwo" class="com.gu.spring.pojo.Teacher">
    <property name="tid" value="10087"></property>
    <property name="tname" value="erer"></property>
</bean>
<util:map id="teacherMap">
    <entry key="10086" value-ref="teacherOne"></entry>
    <entry key="10087" value-ref="teacherTwo"></entry>
</util:map>
<bean id="studentSix" class="com.gu.spring.pojo.Student"
    p:sid="1005" p:sname="xiaoming" p:gender="女" p:teacherMap-ref="teacherMap"
></bean>

 

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