Spring和Abstract类 - 在抽象类中注入属性 [英] Spring and Abstract class - injecting properties in abstract classes

问题描述

我有一个抽象基类，其中包含一个名为mailserver的属性，我希望从spring ioc容器中注入该属性。但是，当我运行抽象类的具体实现时，我得到了一个null的mailserver属性。

I have an abstract base class with a property called "mailserver" which I wish to inject from the spring ioc container. However when I run the concreted implementations of the abstract class I get a null for the mailserver property.

这样做的正确方法是什么？你有没有试过这样做并取得成功？请分享。

What is the correct way of doing this? Have you tried doing someting like this and been successful? Please share.

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推荐答案

标记抽象基础通过使用 abstract 属性将类定义为抽象，并在具体的类定义中，将 parent 属性作为名称抽象类的bean名称

Mark the abstract base class definition as abstract by using the abstract attribute , and in the concrete class definition , make the parent attribute be the name of the abstract class 's bean name

这样的东西：

<bean id="abstractBaseClass" abstract="true" class="pacakge1.AbstractBaseClass">
  <property name="mailserver" value="DefaultMailServer"/>
</bean>

<bean id="concreteClass1" class="pacakge1.ConcreteClass1" parent="abstractBaseClass">     
  <!--Override the value of the abstract based class if necessary-->
  <property name="mailserver" value="AnotherMailServer"/>
</bean>

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