这篇文章主要讲解了“Spring中有哪些bean”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“Spring中有哪些bean”吧！
Spring中有两种bean, 用的最多的是 annotationBean,但是对于一些客制化的需求,可以使用 factoryBean, 它提供了三个接口
@Nullable
T getObject() throws Exception;
@Nullable
Class getObjectType();
default boolean isSingleton() {
return true;
}
定义
@Component
class AutoMoneyHouseExtApiProxyCreator : BeanFactoryPostProcessor {
private val 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)
.addConstructorArgValue(railId)
.addConstructorArgValue(mhId)
.beanDefinition
val railsDisbBeanName = "rails-disb-${provider.name}"
registry.registerBeanDefinition(railsDisbBeanName, railsDisbBeanDef)
val paymentBeanDef = BeanDefinitionBuilder.rootBeanDefinition(DisbursementCPAPIImpl::class.java)
.addConstructorArgValue(mhId)
.addConstructorArgReference(railsDisbBeanName)
.addConstructorArgValue(provider)
.beanDefinition
registry.registerBeanDefinition(Service.PAYMENT.name + "-" + provider.name, paymentBeanDef)
}
// Balance API
val railsBalBeanDef = BeanDefinitionBuilder.rootBeanDefinition(AccountBalanceRpcServiceProxyFactoryBean::class.java)
.addConstructorArgValue(railId)
.addConstructorArgValue(mhId)
.beanDefinition
val railsBalBeanName = "rails-bal-${provider.name}"
registry.registerBeanDefinition(railsBalBeanName, railsBalBeanDef)
val balanceBeanDef = BeanDefinitionBuilder.rootBeanDefinition(BalanceAPIServiceAdapter::class.java)
.addConstructorArgValue(mhId)
.addConstructorArgReference(railsBalBeanName)
.beanDefinition
registry.registerBeanDefinition("BALANCE-" + provider.name, balanceBeanDef)
}
}
class DisbursementRpcServiceProxyFactoryBean(private val railId: String, private val 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(private val railId: String, private val mhId: MoneyHouseID)
: FactoryBean {
@Autowired无锡人流医院哪家好 http://www.ytsg029.com/
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
}
使用
@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)
}
精髓
生成beanDef:
BeanDefinitionBuilder.rootBeanDefinition(DisbursementRpcServiceProxyFactoryBean::class.java)
.addConstructorArgValue(railId)
.addConstructorArgValue(mhId)
.beanDefinition
注册bean
registry.registerBeanDefinition(railsDisbBeanName, railsDisbBeanDef)
其中 registry:
void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException;
registry = beanFactory
感谢各位的阅读，以上就是“Spring中有哪些bean”的内容了，经过本文的学习后，相信大家对Spring中有哪些bean这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！
