我看到过的最恐怖的一个接口：

org.springframework.beans.factory

Interface InitializingBean

All Known Implementing Classes:

AbstractAspectJAdvice, AbstractDataFieldMaxValueIncrementer, AbstractEntityManagerFactoryBean, AbstractFactoryBean, AbstractJasperReportsSingleFormatView, AbstractJasperReportsView, AbstractMessageListenerContainer, AbstractRemoteSlsbInvokerInterceptor, AbstractRequestLoggingFilter, AbstractRoutingDataSource, AbstractSequenceMaxValueIncrementer, AbstractSessionFactoryBean, AbstractSingletonProxyFactoryBean, AbstractSlsbInvokerInterceptor, AbstractTemplateView, AbstractUrlBasedView, AnnotationSessionFactoryBean, AspectJAfterAdvice, AspectJAfterReturningAdvice, AspectJAfterThrowingAdvice, AspectJAroundAdvice, AspectJMethodBeforeAdvice, AttributesJmxAttributeSource, AttributesTransactionAttributeSource, BatchSqlUpdate, BeanConfigurerSupport, BurlapClientInterceptor, BurlapProxyFactoryBean, BurlapServiceExporter, CciDaoSupport, CciLocalTransactionManager, CharacterEncodingFilter, CommonsLogFactoryBean, CommonsRequestLoggingFilter, ConfigurableJasperReportsView, ConfigurableMimeFileTypeMap, ConnectionSpecConnectionFactoryAdapter, ConnectorServerFactoryBean, CronTriggerBean, DaoSupport, DatabaseStartupValidator, DataSourceTransactionManager, DB2SequenceMaxValueIncrementer, DefaultMessageListenerContainer, DefaultMessageListenerContainer102, DefaultPersistenceUnitManager, DelegatingConnectionFactory, DelegatingConnectionFactory, DelegatingDataSource, DelegatingFilterProxy, EhCacheFactoryBean, EhCacheManagerFactoryBean, EisOperation, EventPublicationInterceptor, FieldRetrievingFactoryBean, FilterDefinitionFactoryBean, FreeMarkerConfigurationFactoryBean, FreeMarkerConfigurer, FreeMarkerView, GenericFilterBean, HessianClientInterceptor, HessianProxyFactoryBean, HessianServiceExporter, HibernateAccessor, HibernateAccessor, HibernateDaoSupport, HibernateDaoSupport, HibernateInterceptor, HibernateInterceptor, HibernateTemplate, HibernateTemplate, HibernateTransactionManager, HibernateTransactionManager, HsqlMaxValueIncrementer, HttpInvokerClientInterceptor, HttpInvokerProxyFactoryBean, HttpInvokerServiceExporter, InterfaceBasedMBeanInfoAssembler, InternalResourceView, IsolationLevelDataSourceRouter, JasperReportsCsvView, JasperReportsHtmlView, JasperReportsMultiFormatView, JasperReportsPdfView, JasperReportsXlsView, JaxRpcPortClientInterceptor, JaxRpcPortProxyFactoryBean, JdbcAccessor, JdbcDaoSupport, JdbcTemplate, JdoAccessor, JdoDaoSupport, JdoInterceptor, JdoTemplate, JdoTransactionManager, JmsAccessor, JmsDestinationAccessor, JmsGatewaySupport, JmsInvokerClientInterceptor, JmsInvokerProxyFactoryBean, JmsInvokerServiceExporter, JmsTemplate, JmsTemplate102, JndiObjectFactoryBean, JndiObjectLocator, JndiObjectTargetSource, JndiRmiClientInterceptor, JndiRmiProxyFactoryBean, JndiRmiServiceExporter, JobDetailBean, JpaAccessor, JpaDaoSupport, JpaInterceptor, JpaTemplate, JpaTransactionManager, JstlView, JtaTransactionManager, KeyNamingStrategy, LazyConnectionDataSourceProxy, ListFactoryBean, LocalConnectionFactoryBean, LocalContainerEntityManagerFactoryBean, LocalEntityManagerFactoryBean, LocalJaxRpcServiceFactoryBean, LocalPersistenceManagerFactoryBean, LocalSessionFactoryBean, LocalSessionFactoryBean, LocalSessionFactoryBean, LocalSlsbInvokerInterceptor, LocalStatelessSessionProxyFactoryBean, Log4jNestedDiagnosticContextFilter, MapFactoryBean, MappingCommAreaOperation, MappingRecordOperation, MappingSqlQuery, MappingSqlQueryWithParameters, MBeanClientInterceptor, MBeanExporter, MBeanProxyFactoryBean, MBeanServerConnectionFactoryBean, MBeanServerFactoryBean, MetadataMBeanInfoAssembler, MethodInvokingFactoryBean, MethodInvokingJobDetailFactoryBean, MethodInvokingRunnable, MethodInvokingTimerTaskFactoryBean, MethodMapTransactionAttributeSource, MultipartFilter, MySQLMaxValueIncrementer, NamedParameterJdbcDaoSupport, NotificationListenerBean, ObjectFactoryCreatingFactoryBean, OncePerRequestFilter, OpenEntityManagerInViewFilter, OpenPersistenceManagerInViewFilter, OpenSessionInViewFilter, OpenSessionInViewFilter, OpenSessionInViewInterceptor, OpenSessionInViewInterceptor, OracleSequenceMaxValueIncrementer, PersistenceExceptionTranslationInterceptor, PortletWrappingController, PostgreSQLSequenceMaxValueIncrementer, PreferencesPlaceholderConfigurer, PropertiesFactoryBean, PropertiesMethodNameResolver, RdbmsOperation, RedirectView, RemoteInvocationBasedAccessor, RequestContextFilter, ResourceFactoryBean, ResourceMapFactoryBean, RmiClientInterceptor, RmiProxyFactoryBean, RmiRegistryFactoryBean, RmiServiceExporter, ScheduledExecutorFactoryBean, SchedulerFactoryBean, ServerSessionMessageListenerContainer, ServerSessionMessageListenerContainer102, ServiceLocatorFactoryBean, ServletContextRequestLoggingFilter, ServletWrappingController, SetFactoryBean, SharedEntityManagerBean, SimpleJdbcDaoSupport, SimpleMessageListenerContainer, SimpleMessageListenerContainer102, SimpleRecordOperation, SimpleRemoteSlsbInvokerInterceptor, SimpleRemoteStatelessSessionProxyFactoryBean, SimpleThreadPoolTaskExecutor, SimpleTriggerBean, SingleConnectionFactory, SingleConnectionFactory, SingleConnectionFactory102, SqlCall, SqlFunction, SqlMapClientDaoSupport, SqlMapClientFactoryBean, SqlMapClientTemplate, SqlOperation, SqlQuery, SqlUpdate, StoredProcedure, ThreadPoolTaskExecutor, TilesConfigurer, TilesJstlView, TilesView, TimerFactoryBean, TimerManagerFactoryBean, TimerTaskExecutor, TopLinkAccessor, TopLinkDaoSupport, TopLinkInterceptor, TopLinkTemplate, TopLinkTransactionManager, TransactionAspectSupport, TransactionAwareConnectionFactoryProxy, TransactionAwareDataSourceProxy, TransactionInterceptor, TransactionProxyFactoryBean, TransactionTemplate, TypeDefinitionBean, UpdatableSqlQuery, UrlBasedRemoteAccessor, UserCredentialsConnectionFactoryAdapter, UserCredentialsDataSourceAdapter, VelocityConfigurer, VelocityEngineFactoryBean, VelocityLayoutView, VelocityToolboxView, VelocityView, WebLogicJndiMBeanServerFactoryBean, WebLogicJtaTransactionManager, WebLogicMBeanServerFactoryBean, WorkManagerTaskExecutor, XsltView

public interface InitializingBean  

Interface to be implemented by beans that need to react once all their properties have been set by a BeanFactory: for example, to perform custom initialization, or merely to check that all mandatory properties have been set.

An alternative to implementing InitializingBean is specifying a custom init-method, for example in an XML bean definition. For a list of all bean lifecycle methods, see the BeanFactory javadocs.

Author:

Rod Johnson

Rod Johnson果然是大牛，这么多实现类。