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spring-learn's Introduction

spring-learn

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介绍

spring底层学习demo

1.Spring IOC容器

1. Spring注入方式

  1. set方法注入
  2. 构造方法注入

2.Bean的装配

1. Bean的作用域

  1. singleton 单例获取
  2. prototype 每次请求都创建实例

2. Bean的生命周期

  1. 定义、初始化、使用、销毁
  2. 待补充...

3. Spring aware - 让bean获取spring容器的服务

  1. BeanNameAware 可以获取容器中bean的名称
  2. ApplicationContextAware 当前的applicationContext， 这也可以调用容器的服务

4. Bean的自动装配

  1. byName 根据属性名称自动装配-set注入
  2. byType 在容器中查找指定属性类型进行装配-set注入
  3. constructor 与byType类似-构造方法注入

5. Bean的注解

  1. @Autowired 可以注解list和map；
  2. @Order(1) 改变注解顺序，list中有效
  3. @Qualifier("beanServiceImplOne") 一个接口有多个实现，指定其中一个

6. try catch return

  1. 只要有finally，无论try中是否有return，finally中的代码都会被执行！ 并且会在return之前被执行

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