Bean 的定義 Property Explained in…? class Instantiating beans name Naming beans scope Bean scopes constructor arguments Dependency Injection properties Dependency Injection autowiring mode Autowiring collaborators lazy-initialization mode Lazy-initialized beans initialization method Initialization callbacks destruction method Destruction callbacks 也可以定義bean之后再加入容器。 registerSingleton(..)?and?registerBeanDefinition(..). 可以通過 id 和name給bean命名。 component scanning的方式， Spring會給沒有命名的Component自動命名， 基本上是采用簡單的類名并將其初始字符轉換為小寫 其他命名： <alias name="fromName" alias="toName"/> 一般狀況， 是空的構造函數就可以。 有靜態方法 <bean id="clientService" class="examples.ClientService" factory-method="createInstance"/> public class ClientService { private static ClientService clientService = new ClientService(); private ClientService() {} public static ClientService createInstance() { return clientService; } } } 使用實例工廠化方法 <bean id="serviceLocator" class="examples.DefaultServiceLocator"> <!-- inject any dependencies required by this locator bean --> </bean> <!-- the bean to be created via the factory bean --> <bean id="clientService" factory-bean="serviceLocator" factory-method="createClientServiceInstance"/> public class DefaultServiceLocator { private static ClientService clientService = new ClientServiceImpl(); public ClientService createClientServiceInstance() { return clientService; } } }