The bean injected through @autowired can still be injected even if the class is not annotated with annotations such as @comment

  Problem description ： During unit testing in the company's project, I found , Even if there is no annotation on this class @Comment perhaps @Service And so on , however Bean Can still be injected .

Logically speaking springboot When scanning , Classes without annotations will not be loaded into ioc Inside the container , It's strange . Because it is common to inject classes into ioc In the container , Nothing more than through annotations and xml, Annotations are not configured , That should be through xml Instantiate , After investigation, it was found that , Pass... In the startup class @ImportResource Imported xml file applicationContext.xml In this xml There is such a configuration in  

<context:component-scan base-package="com.xxx.xxx">
    <context:include-filter type="aspectj"
                            expression="com.xxx.xxx..impl..*BOImpl"/>
    <context:include-filter type="aspectj"
                            expression="com.xxx.xxx..impl..*ServiceImpl"/>
</context:component-scan>

 

context:include-filter There are five types of filters type：

　　assignable- Specify to scan the classes derived from an interface

　　annotation- Specify to scan classes that use an annotation

　　aspectj- Specify scan AspectJ Expression matching class

　　custom- Specify the implementation of scanning customization org.springframework.core.type.filter.TypeFilter The class of the interface

　　regex- Specify to scan classes that conform to regular expressions

 

So at present expression The classes under the set path will be automatically injected into the container