Spring和SpringBoot项目初始化管理

为什么80%的码农都做不了架构师？>>>   

Spring

1. InitializingBean

void afterPropertiesSet() throws Exception;

Invoked by a BeanFactory after it has set all bean properties supplied

当bean中的参数都初始化完毕后调用此方法

2. DisposableBean

/**
 * Interface to be implemented by beans that want to release resources
 * on destruction. A BeanFactory is supposed to invoke the destroy
 * method if it disposes a cached singleton. An application context
 * is supposed to dispose all of its singletons on close.
 *
 * <p>An alternative to implementing DisposableBean is specifying a custom
 * destroy-method, for example in an XML bean definition.
 * For a list of all bean lifecycle methods, see the BeanFactory javadocs.
 *
 * @author Juergen Hoeller
 * @since 12.08.2003
 * @see org.springframework.beans.factory.support.RootBeanDefinition#getDestroyMethodName
 * @see org.springframework.context.ConfigurableApplicationContext#close
 */
public interface DisposableBean {

	/**
	 * Invoked by a BeanFactory on destruction of a singleton.
	 * @throws Exception in case of shutdown errors.
	 * Exceptions will get logged but not rethrown to allow
	 * other beans to release their resources too.
	 */
	void destroy() throws Exception;

}

当bean销毁的时候调用，用来做一些release resource

springboot

1. ApplicationRunner

/**
	 * Callback used to run the bean.
	 * @param args incoming application arguments
	 * @throws Exception on error
	 */
void run(ApplicationArguments args) throws Exception;

ApplicationArguments是SpringBoot中的一个接口，他的实现类是DefaultApplicationArguments

org.springframework.boot.DefaultApplicationArguments

org.springframework.boot.ApplicationArguments

Provides access to the arguments that were used to run a {@link SpringApplication}.

通过ApplicationArguments的注释可以看到通过ApplicationArguments获取SpringApplication启动的一些参数

2. CommandLineRunner

/**
	 * Callback used to run the bean.
	 * @param args incoming main method arguments
	 * @throws Exception on error
	 */
void run(String... args) throws Exception;

可以看出这两个接口的区别是run方法的参数，如果不需要获取SpringApplication的启动参数，可以直接使用CommandLineRunner

否者使用ApplicationRunner

总结

ApplicationRunner，CommandLineRunner是在容器初始化完毕后调用相应的方法

InitializingBean 在bean中的参数已经初始化完毕后调用afterPropertiesSet方法

转载于:https://my.oschina.net/kipeng/blog/1795101