spring中service类代理的加载过程
@RestControllerpublic class HelloController {
@Autowired
UserService userService;
}
@Service
public class UserServiceImpl implements UserService {
}
关键步骤
- spring容器初始化HelloController
- 属性填充userService
- AutowiredAnnotationBeanPostProcessor完成userService填充
- spring容器初始化userService
- AnnotationAwareAspectJAutoProxyCreator将userService封装成代理类
流程
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#doCreateBean创建bean createBeanInstance创建HelloController实例
populateBean属性设置(设置UserService)
AutowiredAnnotationBeanPostProcessor#postProcessProperties设置Autowired属性
findAutowiringMetadata查找所有需要注入的属性
metadata.inject属性注入
element.inject(target, beanName, pvs)
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.AutowiredFieldElement#inject
beanFactory.resolveDependency从beanFactory中获取需要注入的对象
field.set(bean, value);利用反射进行属性设置
initializeBean初始化完成后的一些后置操作,userService创建时会在此处创建代理
@Autowired注解
Note that actual injection is performed through a BeanPostProcessor which in turn means that you cannot use @Autowired to inject references into BeanPostProcessor or BeanFactoryPostProcessor types. Please consult the javadoc for the AutowiredAnnotationBeanPostProcessor class (which, by default, checks for the presence of this annotation).
请注意,实际的注入是通过BeanPostProcessor执行的,这意味着您不能使用@Autowired将引用注入到BeanPostProcessor或BeanFactoryPostProcessor类型中。请咨询javadoc以获得AutowiredAnnotationBeanPostProcessor类(在默认情况下,该类检查是否存在此注释)。
@Autowired通过AutowiredAnnotationBeanPostProcessor来完成注入
AutowiredAnnotationBeanPostProcessor类
主要靠这个类完成属性注入
参考
- https://blog.csdn.net/qq_26344609/article/details/78905985
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