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                [TOC] # 繼承Bean配置 * spring允許繼承bean的配置,被繼承的bean稱為父bean.繼承這個父bean的bean稱為子bean * **子bean從父bean中繼承配置,包括bean的屬性配置** * 子bean也可以覆蓋從父bean繼承過來的配置 * **父bean可以作為配置模板,也可以作為bean實例,若只想把父bean作為模板,可以設置`<bean>`的abstract屬性設置為true,這樣spring就不會實例化這個bean** * **并不是`<bean>`元素里的所有屬性都會被繼承,比如autowire,abstract等** * 可以忽略父bean的class屬性.讓bean指定自己的類,而共享相同的屬性配置,但此時abstract必須設為true ## 繼承 ~~~ <bean name="user" class="com.spring.User"> <property name="name" value="jelly" /> </bean> <!-- 繼承 --> <bean id="user1" class="com.spring.User" parent="user"> <property name="age" value="17" /> </bean> ~~~ ## 抽象bean abstract屬性設置為true,這樣spring就不會實例化這個bean ~~~ <bean name="user" abstract="true"> <property name="name" value="jelly" /> </bean> <!-- 繼承 --> <bean id="user1" class="com.spring.User" parent="user"> <property name="age" value="19" /> </bean> ~~~ # 依賴Bean配置 * spring允許用戶通過depends-on屬性設定bean前置依賴的bean,前置依賴的bean會在本bean實例化之前創建好 * 如果前置依賴于多個bean,則可以通過逗號,或空格的方式配置bean的名稱 ~~~ <bean name="car" class="com.spring.Car"> <property name="name"> <value><![CDATA[<奔馳>]]></value> </property> <property name="color" value="黃色"/> </bean> <bean name="user" class="com.spring.User" depends-on="car"> <property name="name" value="jelly" /> </bean> ~~~
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