What are the bean in Spring
This article mainly explains "what bean is in Spring". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what bean is in Spring.
There are two kinds of bean in Spring, the most commonly used is annotationBean, but for some customized requirements, you can use factoryBean, which provides three interfaces
@ Nullable
T getObject () throws Exception
@ Nullable
Class getObjectType ()
Default boolean isSingleton () {
Return true
}
Define
@ Component
Class AutoMoneyHouseExtApiProxyCreator: BeanFactoryPostProcessor {
Privateval logger: Logger = LogManager.getLogger ()
Override fun postProcessBeanFactory (beanFactory: ConfigurableListableBeanFactory) {
ServiceProvider::class.java.declaredFields.filter {
It.isEnumConstant & & it.isAnnotationPresent (Rail::class.java)
}. ForEach {
Val railId = it.getAnnotation (Rail::class.java) .id
Val provider = it.get (null) as ServiceProvider
CreateApiProxy (railId, provider, beanFactory as BeanDefinitionRegistry)
}
}
Private fun createApiProxy (railId: String, provider: ServiceProvider
Registry: BeanDefinitionRegistry) {
Logger.info ("auto-generate api proxy for: {}", provider)
Val mhId = provider.providerName
/ / Payment API
If (provider.services.contains (Service.PAYMENT)) {
Val railsDisbBeanDef = BeanDefinitionBuilder.rootBeanDefinition (DisbursementRpcServiceProxyFactoryBean::class.java)
.addConstructor ArgValue (railId)
.addConstructor ArgValue (mhId)
.beanDefinition
Val railsDisbBeanName = "rails-disb-$ {provider.name}"
Registry.registerBeanDefinition (railsDisbBeanName, railsDisbBeanDef)
Val paymentBeanDef = BeanDefinitionBuilder.rootBeanDefinition (DisbursementCPAPIImpl::class.java)
.addConstructor ArgValue (mhId)
.addConstructorArgReference (railsDisbBeanName)
.addConstructor ArgValue (provider)
.beanDefinition
Registry.registerBeanDefinition (Service.PAYMENT.name + "-" + provider.name, paymentBeanDef)
}
/ / Balance API
Val railsBalBeanDef = BeanDefinitionBuilder.rootBeanDefinition (AccountBalanceRpcServiceProxyFactoryBean::class.java)
.addConstructor ArgValue (railId)
.addConstructor ArgValue (mhId)
.beanDefinition
Val railsBalBeanName = "rails-bal-$ {provider.name}"
Registry.registerBeanDefinition (railsBalBeanName, railsBalBeanDef)
Val balanceBeanDef = BeanDefinitionBuilder.rootBeanDefinition (BalanceAPIServiceAdapter::class.java)
.addConstructor ArgValue (mhId)
.addConstructorArgReference (railsBalBeanName)
.beanDefinition
Registry.registerBeanDefinition ("BALANCE-" + provider.name, balanceBeanDef)
}
}
Class DisbursementRpcServiceProxyFactoryBean (privateval railId: String, privateval mhId: MoneyHouseID)
: FactoryBean {
@ Autowired
Lateinit var restTemplate: RestTemplate
@ Value ("\ ${application.railsGateway.url}")
Var railsGatewayUrl: String = ""
Override fun getObject (): DisbursementRpcService {
Val client = JsonRpcRestClient (URL (URL (railsGatewayUrl), railId + DisbursementRpcService.SERVICE_PATH)
Codecs.NO_NULL_FIELD_ORDERED_MAPPER, restTemplate
MapOf ("mhId" to mhId))
Return ProxyUtil.createClientProxy (javaClass.classLoader, DisbursementRpcService::class.java, client)
}
Override fun getObjectType () = DisbursementRpcService::class.java
}
Class AccountBalanceRpcServiceProxyFactoryBean (privateval railId: String, privateval mhId: MoneyHouseID)
: FactoryBean {
@ Autowired which is a good http://www.ytsg029.com/ in Wuxi abortion Hospital
Lateinit var restTemplate: RestTemplate
@ Value ("\ ${application.railsGateway.url}")
Var railsGatewayUrl: String = ""
Override fun getObject (): AccountBalanceRpcService {
Val client = JsonRpcRestClient (URL (URL (railsGatewayUrl), railId + AccountBalanceRpcService.SERVICE_PATH)
Codecs.NO_NULL_FIELD_ORDERED_MAPPER, restTemplate
MapOf ("mhId" to mhId))
Return ProxyUtil.createClientProxy (javaClass.classLoader, AccountBalanceRpcService::class.java, client)
}
Override fun getObjectType () = AccountBalanceRpcService::class.java
}
Use
@ Target (AnnotationTarget.FIELD)
Annotation class Rail (val id: String)
Enum class ServiceProvider constructor (val providerName: String, vararg list: Service) {
@ Rail ("ttt") TTTT (MHHIDs.TTTT, Service.CONVERSION, Service.PAYMENT)
Val services: Array = arrayOf (* list)
}
Essence
Generate beanDef:
BeanDefinitionBuilder.rootBeanDefinition (DisbursementRpcServiceProxyFactoryBean::class.java)
.addConstructor ArgValue (railId)
.addConstructor ArgValue (mhId)
.beanDefinition
Register for bean
Registry.registerBeanDefinition (railsDisbBeanName, railsDisbBeanDef)
Where registry:
Void postProcessBeanFactory (ConfigurableListableBeanFactory beanFactory) throws BeansException
Registry = beanFactory
Thank you for your reading, the above is the content of "what is bean in Spring". After the study of this article, I believe you have a deeper understanding of what bean is in Spring, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!
