The difference between spring's <context:annotation-config> and <context:component-scan>

the difference:

• 1. <context:annotation-config>: [Autowired] is used to activate (@Autowired) beans that have been registered in the spring container (whether by xml or by package sanning).
• 2. <context:component-scan>: [Automatic registration + assembly] In addition to the function of <context:annotation-config />, <context:component-scan> also has the function of automatically adding @component, @service, The function of registering objects annotated with @Repository in the spring container.
• <context:component-scan/>包含了<context:annotation-config/>

<context:component-scan> scan content:

• 1、配置：<context:component-scan base-package="com.test" />

              Effect: Scan the classes annotated with @component, @service, @Repository, etc. under the com.test package and register them in the spring container

• 2、配置：<context:component-scan base-package="com.test"  use-default-filters="false"/>

            Effect: nothing is scanned, and no classes are registered with spring

• 3. Configuration:

<context:component-scan base-package="com.test" use-default-filters="false">
  <!-- 扫描符合@Service的类 -->
  <context:include-filter type="annotation" expression="org.springframework.stereotype.Service" />
</context:component-scan>

              Effect: Scan the classes annotated with @service under the com.test package and register them in the spring container

• 4. Configuration:

<context:component-scan base-package="com.test" use-default-filters="false">
 <context:include-filter type="regex" expression="com.test.entity.*" />
</context:component-scan>

              Effect: Scan all the classes under the com.test.entity package and register them in the spring container

 

• 5. Configuration:

<context:component-scan base-package="com.test" >

<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
</context:component-scan>

              Effect: Scan the classes annotated with @component, @Repository, etc. under the com.test package, and register them in the spring container (note: classes that do not contain @service annotations)

• 6. Configuration:
  <context:component-scan base-package="com.test" use-default-filters="false">
    <!-- Scan classes that conform to @Service @Repository -->
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Service" />
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository" />
       <context:include-filter type= "regex" expression="com.test.entity.*"/>
  </context:component-scan>
  Effect: Scan @Service, @Repository annotated entities under the com.test package and entities under the com.test.entity package All entities [other annotations such as @component will not be scanned, because use-default-filters="false" turns off the default scanning method]
• Summary:
   use-default-filters is true by default, that is, the @component, @service, @Repository annotations under the base-package package and subpackages will be scanned by default. If it is set to false, @component, @service, @ will not be scanned. Repository annotation
  context: include-filter takes base-package as the root directory, and customizes adding beans that need to be scanned [that is, beans that can be scanned without adding any annotations]
• This is just a personal summary, please point out any mistakes

the difference:

• 1. <context:annotation-config>: [Autowired] is used to activate (@Autowired) beans that have been registered in the spring container (whether by xml or by package sanning).
• 2. <context:component-scan>: [Automatic registration + assembly] In addition to the function of <context:annotation-config />, <context:component-scan> also has the function of automatically adding @component, @service, The function of registering objects annotated with @Repository in the spring container.
• <context:component-scan/>包含了<context:annotation-config/>