[Add] Spring bean 的生命周期

Author: c-rainstorm

java/Bean的生命周期.md

@@ -0,0 +1,104 @@
+# Spring bean 的生命周期
+
+## 概述
+
+![Spring bean 生命周期](http://image.rainstorm.vip/blog/spring/spring-bean-lifecycle.png)
+
+1. 注入属性
+2. `Aware` 的 setter 方法注入资源
+3. `BeanPostProcessor` 进行初始化前后的处理（`BeanPostProcessor`实现类不能处理 `BeanPostProcessor`实现类）
+4. `@PostConstruct`
+5. `@PreDestroy`
+
+## 测试类
+
+在 [boot-init](https://github.com/c-rainstorm/boot-init) 项目中, `BeanLifeCycleAllInOne`,`AfterBeanInitial`
+
+```java
+@Slf4j
+@Component
+public class BeanLifeCycleAllInOne implements BeanNameAware, ApplicationContextAware, BeanFactoryAware, EnvironmentAware, ResourceLoaderAware {
+
+    @Override
+    public void setBeanName(String name) {
+        log.info("BeanNameAware.setBeanName -- {}", name);
+    }
+
+    @Override
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+        log.info("ApplicationContextAware.setApplicationContext");
+    }
+
+
+    @Override
+    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+        log.info("BeanFactoryAware.setBeanFactory");
+    }
+
+    @Override
+    public void setEnvironment(Environment environment) {
+        log.info("EnvironmentAware.setEnvironment");
+    }
+
+
+    @Override
+    public void setResourceLoader(ResourceLoader resourceLoader) {
+        log.info("ResourceLoaderAware.setResourceLoader");
+    }
+
+    @PostConstruct
+    public void postConstruct() {
+        log.info("BeanLifeCycleAllInOne.postConstruct");
+    }
+
+    @PreDestroy
+    public void preDestroy() {
+        log.info("BeanLifeCycleAllInOne.preDestroy");
+    }
+}
+```
+
+```java
+@Slf4j
+@Component
+public class AfterBeanInitial implements BeanPostProcessor {
+    @Override
+    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
+        if (BeanLifeCycleAllInOne.class.getSimpleName().equalsIgnoreCase(beanName)) {
+            log.info("AfterBeanInitial.postProcessBeforeInitialization -- {}", beanName);
+        }
+        return bean;
+    }
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
+        if (BeanLifeCycleAllInOne.class.getSimpleName().equalsIgnoreCase(beanName)) {
+            log.info("AfterBeanInitial.postProcessAfterInitialization -- {}", beanName);
+        }
+        return bean;
+    }
+}
+
+```
+
+## 测试输出
+
+```log
+2019-09-01 11:05:36.426  INFO 53094 --- [           main] m.r.b.l.bean.BeanLifeCycleAllInOne       : BeanNameAware.setBeanName -- beanLifeCycleAllInOne
+2019-09-01 11:05:36.426  INFO 53094 --- [           main] m.r.b.l.bean.BeanLifeCycleAllInOne       : BeanFactoryAware.setBeanFactory
+2019-09-01 11:05:36.426  INFO 53094 --- [           main] m.r.b.l.bean.BeanLifeCycleAllInOne       : EnvironmentAware.setEnvironment
+2019-09-01 11:05:36.426  INFO 53094 --- [           main] m.r.b.l.bean.BeanLifeCycleAllInOne       : ResourceLoaderAware.setResourceLoader
+2019-09-01 11:05:36.426  INFO 53094 --- [           main] m.r.b.l.bean.BeanLifeCycleAllInOne       : ApplicationContextAware.setApplicationContext
+2019-09-01 11:05:36.426  INFO 53094 --- [           main] m.r.b.lifecycle.bean.AfterBeanInitial    : AfterBeanInitial.postProcessBeforeInitialization -- beanLifeCycleAllInOne
+2019-09-01 11:05:36.426  INFO 53094 --- [           main] m.r.b.l.bean.BeanLifeCycleAllInOne       : BeanLifeCycleAllInOne.postConstruct
+2019-09-01 11:05:36.427  INFO 53094 --- [           main] m.r.b.lifecycle.bean.AfterBeanInitial    : AfterBeanInitial.postProcessAfterInitialization -- beanLifeCycleAllInOne
+
+...
+
+2019-09-01 11:06:57.845  INFO 53094 --- [      Thread-16] m.r.b.l.bean.BeanLifeCycleAllInOne       : BeanLifeCycleAllInOne.preDestroy
+```
+
+## 参考
+
+1. [ Java 程序员必备的一些流程图 -  芋道源码](https://mp.weixin.qq.com/s/8D4OXsU7CoSHF68LtaF2YA)
+1. [Interface Aware](https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/beans/factory/Aware.html)