Spring all annotations Big Secret

Statement bean notes

@Component components, there is no clear role
@Service use (service layer) Yewuluojiceng
Use @Repository (DAO layer) in the data access layer
@Controller use in the presentation layer, the statement Controller

Inject bean notes

@Autowired: provided by Spring, automatic assembly according to the type, if the combination of the name will be assembled using @Qualifier
@Inject: providing javax.inject.Inject need to import using the JSR-330; the same is automatically achieved injection assembly according to the type, by name if required for assembly, it is necessary with @Named
@Resource: by JSR-250, introduced in javax.annotation need to use, based on the name of the automatic assembly, generally specify a name attribute

Functional annotation

@Transactional statement affairs
@Cacheable statement cache

A comment about configuration class

@Configuration declare the current class configuration class
@Bean comment on the method, declare the current method returns a value of a bean
Component @ComponentScan for scanning,
@WishlyConfiguration combination with @ComponentScan @Configuration annotations can replace the two annotations

Section (AOP) related annotations

@Aspect Declaring an aspect
@After executed after execution method
@Before executed before execution method
@Around perform before and after the execution method
@PointCut sound Mingqie point

@Bean attributes support

Spring new set @Scope Bean type, optionally comprising:

Singleton single embodiment, a Spring bean container only one example, the default mode
Protetype each call to create a new bean
Request web project, every http request to create a new bean
Session web project, to create a new bean each http session
GlobalSession (a global http session for each new instance of a Bean

Class lifecycle comment

@PostConstruct by JSR-250, after executing the class's constructor performed, equivalent to the xml configuration file in the bean initMethod
@PreDestory provided by JSR-250, performed before the destruction Bean

Configuration injection

@Value injection attribute value, the injection support in the following manner:

Ordinary characters @Value ( "Michael Jackson")
Operating system properties @Value ( "# {systemProperties [ ' The os.name ']}")
Results Expression @Value ( "# {T (java.lang.Math) .random () * 100}")
Other bean property @Value ( "# { domeClass.name }")
File Explorer @Value ( "classpath: cn / shiyujun / test.txt")
Web site resources @Value ( " https://shiyujun.cn ")
Profile property @Value ( "{$ book.name }")

Injection configuration file @PropertySource ( "classpath: cn / shiyujun / test.propertie")

Context switching

@Profile to set the current configuration environment context to use by setting Environment of ActiveProfiles
@Conditional bean loading of different codes according to the conditions set, including a series of notes
- @ConditionalOnBean existence bean
- @ConditionalOnMissingBean bean does not exist
- @ConditionalOnClass there is a class
- @ConditionalOnMissingClass a class does not exist
- @ConditionalOnProperty (prefix = "syj", name = "algorithm", havingValue = "token"), when present in the configuration file SYJ prefixed attributes, attribute name algorithm, then it will instantiate a token value class.
- @ConditionalOnProperty (prefix = "syj", name = "algorithm", havingValue = "counter", matchIfMissing = true) if all are not met, then the choice counter default implementation
- If @ConditionalOnJava is a Java application
- If the Web application is @ConditionalOnWebApplication

Asynchronous relevant

@Async use the annotation bean method to declare its actual implementation is an asynchronous task

The timing of tasks related to

@Scheduled to declare this is a task, including cron, fixDelay, fixRate other types

Some features open

@EnableAspectJAutoProxy turn on automatic proxy support for AspectJ
@EnableAsync open support asynchronous method
@EnableScheduling open Scheduled Tasks support
@EnableWebMvc open configuration support of Web MVC
@EnableConfigurationProperties turn supports the configuration of @ConfigurationProperties Bean notes
@EnableJpaRepositories open support for the SpringData JPA Repository
@EnableTransactionManagement open transaction annotation support
@EnableCaching open an annotation-caching support

Test-related notes

@RunWith Spring is usually used to support for the JUnit
@ContextConfiguration used to load configuration ApplicationContext

SpringMVC part

@RequestMapping Web requests for mapping, including access paths and parameters
ResponseBody support the return value placed in the response, rather than a page
Means for receiving path parameter @PathVariable
@RestController The annotation is a combination of notes, equivalent to a combination of @Controller and @ResponseBody, and notes on the class, which means all of the methods of the Controller will assume added @ResponseBody
@ControllerAdvice by the annotation, we can place the profile for the global controller in the same position, the annotation @Controller method, can be utilized @ ExceptionHandler, @ InitBinder, @ ModelAttribute annotation to the method,
which all annotated! the method in the controller RequestMapping effective.
@ExceptionHandler used for global exception handling in the controller
@InitBinder to set WebDataBinder, WebDataBinder reception request parameters used to automatically bind the Model.
Originally role @ModelAttribute is to bind key-value pairs in the Model, is to let the global @RequestMapping have access to the key set here in @ControllerAdvice in.

SpringBoot related

@EnableAutoConfiguration Bean automatically loads all the required applications. The combination of the annotation @Import annotations, @ Import annotation introduced EnableAutoCofigurationImportSelector class, which uses the scanning method SpringFactoriesLoader.loaderFactoryNames jar package having a META-INF / spring.factories file. The spring.factories in a statement which automatically configures
+ @SpingBootApplication SpringBoot core notes, the main purpose is to open the automatic configuration. It is also a combination of notes, mainly combines @ Configurer, @ EnableAutoConfiguration (core) and @ComponentScan. Can be closed by means of specific automatic configuration @SpringBootApplication (exclude = {class want to close the .class} auto-configuration)
@ImportResource load xml configuration
@AutoConfigureAfter rearranged after the specified class autoconfiguration