Spring basic usage 6 - sorting out common annotations in Spring

         Foreword: This article focuses on sorting out various annotations in Spring, briefly introducing the usage scenarios and usage of each annotation, without doing in-depth research, it can be used as a manual query.

1 Overview

       When the note configuration mode is enabled, the functions of the relevant tags in the configuration file:

<!-- Start the scanning component function-->
<context:component-scan base-package="com"/>

<!-- Start the injection function-->  
<context:annotation-config />

<!-- Start the annotation transaction configuration function-->  
<tx:annotation-driven transaction-manager="transactionManager" />  

<!-- SpringMVC -->
<mvc:annotation-driven/>

        Overview of Common Annotations

annotation	effect
@Component	Annotate a normal Spring Bean class
@Controller	Annotate a controller component class
@Service	Annotate a business logic component class
@Repository	Annotate a Dao component
@Scope	Specify the scope of the bean instance
@Resource	Assemble by name first, then assemble by type if not found
@Autowired	Assemble by type first, then assemble by name if not found, then report error
@Primary	When there are multiple bean candidates during autowiring, the bean annotated with @Primary will be the first choice
@Autowired @Qualifier	There are multiple instances used together
@Resource	Assemble by name first, then assemble by type if not found
@Lazy(true)	Indicates lazy initialization
@PostConstruct	Used to specify the initialization method (used on methods)
@PreDestory	Used to specify the destruction method (used on methods)
@DependsOn	Define the order in which beans are initialized and destroyed
@Transational	Encapsulates the AOP implementation of transaction management
@Async	Asynchronous method call

 

 2. Mind map