在没有类属性的xml中定义bean [英] Defining bean in xml without class attribute

问题描述

我是Spring世界的新手.在一次采访中，有人问我们是否可以在不指定class的情况下以XML创建bean(即，该bean仅具有id属性).我没有答案.请告知我们是否可以在Spring中使用XML创建一个bean，而无需指定class属性，以及在什么情况下通常可以这样做.

I am a newbie to the world of Spring. In an interview, it was asked if we can create a bean in XML without specifying the class (that is, the bean would only have an id attribute). I did not have the answer to this. Please advise if we can create a bean in XML in Spring without specifying the class attribute and under which conditions we would normally do this.

推荐答案

Spring

Spring documentation makes it quite clear:

<!--
    Each bean definition must specify the fully qualified name of the class,
    except if it pure serves as parent for child bean definitions.
-->
<!ATTLIST bean class CDATA #IMPLIED>

This section explains it in detail and provides useful examples.

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