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Commit 8564c37

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add serveral ways to configure beans in java readme
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‎springboot-source-code-analysis/(11)通过Java配置Bean的几种方式.md‎

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‎springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/ioc/ann/MyFactoryBean.java‎

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@Component
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public class MyFactoryBean implements FactoryBean<Animal> {
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/**
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* 返回要注入的类
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*/
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@Override
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public Animal getObject() throws Exception {
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return new Cat();
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}
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/**
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* 获取要注入类的类型
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*/
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@Override
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public Class<?> getObjectType() {
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return Animal.class;
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public boolean isSingleton() {
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return FactoryBean.super.isSingleton();
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}
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}
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### 通过Java配置Bean的几种方式
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#### 1.通过@Configuration注解注入Bean的方式
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```java
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@Configuration
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public class MyBeanConfiguration {
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/**
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* 通过 @Configuration注解 注入一个Bean
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*/
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@Bean("dog")
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public Animal getDog() {
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return new Dog();
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}
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}
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```
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#### 2.通过实现FactoryBean<?>接口的方式注入Bean
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```java
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@Component
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public class MyFactoryBean implements FactoryBean<Animal> {
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/**
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* 返回要注入的类
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*/
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@Override
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public Animal getObject() throws Exception {
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return new Cat();
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}
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/**
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* 获取要注入类的类型
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*/
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@Override
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public Class<?> getObjectType() {
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return Animal.class;
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}
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@Override
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public boolean isSingleton() {
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return FactoryBean.super.isSingleton();
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}
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}
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```
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#### 3.通过实现BeanDefinitionRegistryPostProcessor接口的方式注入Bean
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```java
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@Component
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public class MyBeanDefinitionRegistry implements BeanDefinitionRegistryPostProcessor {
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/**
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* 通过BeanDefinitionRegistryPostProcessor
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*/
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@Override
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public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry beanDefinitionRegistry) throws BeansException {
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RootBeanDefinition rootBeanDefinition = new RootBeanDefinition();
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rootBeanDefinition.setBeanClass(Monkey.class);
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beanDefinitionRegistry.registerBeanDefinition("monkey", rootBeanDefinition);
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}
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@Override
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public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
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}
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}
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```
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#### 4.通过实现ImportBeanDefinitionRegistrar接口的方式注入Bean
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```java
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public class MyImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {
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/**
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* 通过ImportBeanDefinitionRegistrar注入Bean
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*/
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@Override
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public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
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RootBeanDefinition rootBeanDefinition = new RootBeanDefinition();
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rootBeanDefinition.setBeanClass(Bird.class);
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registry.registerBeanDefinition("bird", rootBeanDefinition);
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}
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}
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```
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> 使用时:用 @Import(MyImportBeanDefinitionRegistrar.class) 进行注入
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