org.springframework.beans.factory包下有一個接口是InitializingBean 只有一個方法：
/**
* Invoked by a BeanFactory after it has set all bean properties supplied
* (and satisfied BeanFactoryAware and ApplicationContextAware).
* <p>This method allows the bean instance to perform initialization only
* possible when all bean properties have been set and to throw an
* exception in the event of misconfiguration.
* @throws Exception in the event of misconfiguration (such
* as failure to set an essential property) or if initialization fails.
*/
void afterPropertiesSet() throws Exception;
這個方法將在所有的屬性被初始化後調用。
但是會在init前調用。
但是主要的是如果是延遲加載的話，則馬上執行。
所以可以在類上加上註解：
import org.springframework.context.annotation.Lazy;
@Lazy(false)
這樣spring容器初始化的時候afterPropertiesSet就會被調用。
只需要實現InitializingBean接口就行。
如果代碼在這裏初始化的話，半天都找不到。。
轉載：http://www.cnblogs.com/java-boy/archive/2012/12/21/2827729.html
