java：spring使用【XXXPostProcessor】添加bean定义，修改bean定义、代理bean

# 项目代码资源：

可能还在审核中，请等待。。。
https://download.csdn.net/download/chenhz2284/89433361

# 项目代码

【pom.xml】

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>2.3.12.RELEASE</version>
</dependency>
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId><version>2.3.12.RELEASE</version>
</dependency>
<dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.2.11</version>
</dependency>

【application.properties】

server.port=8080
spring.application.name=myBeanMainmanagement.server.port=7001
management.endpoints.web.exposure.include=*

【IMainBean4.java】

package com.chz.myBeanMain.bean;public interface IMainBean4
{String getName();
}

【MainBean1.java】

package com.chz.myBeanMain.bean;@Slf4j
@Getter
@Setter
@Component
public class MainBean1 {public MainBean1(){log.info("chz >>> MainBean1.<init>()");}private String name = "MainBean1";
}

【MainBean2.java】

package com.chz.myBeanMain.bean;@Slf4j
@Getter
@Setter
// @Component   // 注意没有注解
public class MainBean2 {public MainBean2(){log.info("chz >>> MainBean2.<init>()");}private String name = "MainBean2";
}

【MainBean3.java】

package com.chz.myBeanMain.bean;@Slf4j
@Getter
@Setter
// @Component   // 注意没有注解
public class MainBean3 {public MainBean3(){log.info("chz >>> MainBean3.<init>()");}private String name = "MainBean3";
}

【MainBean4.java】

package com.chz.myBeanMain.bean;@Slf4j
@Getter
@Setter
@Component
public class MainBean4 implements IMainBean4 {public MainBean4(){log.info("chz >>> MainBean4.<init>()");}private String name = "MainBean4";
}

【MainBean4Proxy.java】

package com.chz.myBeanMain.bean;public class MainBean4Proxy implements IMainBean4{private MainBean4 mainBean4;public MainBean4Proxy(MainBean4 mainBean4){this.mainBean4 = mainBean4;}@Overridepublic String getName() {return "[我被代理了："+ mainBean4.getName()+"]";}
}

【MainController.java】

package com.chz.myBeanMain.controller;@Slf4j
@RestController
@RequestMapping("/main")
public class MainController {@Autowired(required = false)private MainBean1 mainBean1;@Autowired(required = false)private MainBean2 mainBean2;@Autowired(required = false)private MainBean3 mainBean3;@Autowired(required = false)private IMainBean4 mainBean4;@GetMapping("/mainBean1")public String mainBean1() {return "mainBean1: " + mainBean1.getName();}@GetMapping("/mainBean2")public String mainBean2() {return "mainBean2: " + mainBean2.getName();}@GetMapping("/mainBean3")public String mainBean3() {return "mainBean3: " + mainBean3.getName();}@GetMapping("/mainBean4")public String mainBean4() {return "mainBean4: " + mainBean4.getName();}
}

【MyBeanDefinitionRegistryPostProcessor.java】

package com.chz.myBeanMain.postProcessor;@Slf4j
@Component
public class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor
{@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException{log.info("chz >>> MyBeanDefinitionRegistryPostProcessor.postProcessBeanDefinitionRegistry():");// 修改bean的属性BeanDefinition mainBean1 = registry.getBeanDefinition("mainBean1");mainBean1.getPropertyValues().add("name", "[mainBean1 - 我被MyBeanDefinitionRegistryPostProcessor改了]");}@Overridepublic void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException{log.info("chz >>> MyBeanDefinitionRegistryPostProcessor.postProcessBeanFactory():");// 添加一个beanMainBean2 mainBean2 = new MainBean2();mainBean2.setName(mainBean2.getName() + " - 我是通过MyBeanDefinitionRegistryPostProcessor新加的bean");beanFactory.registerSingleton("mainBean2", mainBean2);}
}

【MyBeanFactoryPostProcessor.java】

package com.chz.myBeanMain.postProcessor;@Slf4j
@Component
public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor
{@Overridepublic void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException{log.info("chz >>> MyBeanFactoryPostProcessor.postProcessBeanFactory():");// 添加一个beanMainBean3 mainBean3 = new MainBean3();mainBean3.setName(mainBean3.getName() + " - 我是通过MyBeanFactoryPostProcessor新加的bean");beanFactory.registerSingleton("mainBean3", mainBean3);}
}

【MyBeanPostProcessor.java】

package com.chz.myBeanMain.postProcessor;@Slf4j
@Component
public class MyBeanPostProcessor implements BeanPostProcessor
{@Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {log.info("chz >>> MyBeanPostProcessor.postProcessBeforeInitialization(): {}", beanName);return bean;}@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException{log.info("chz >>> MyBeanPostProcessor.postProcessAfterInitialization(): {}", beanName);if( (bean instanceof IMainBean4) && !(bean instanceof MainBean4Proxy)){// 代码beanbean = new MainBean4Proxy((MainBean4)bean);}return bean;}
}

【MyBeanMainTest.java】

package com.chz.myBeanMain;@SpringBootApplication
public class MyBeanMainTest {public static void main(String[] args) {SpringApplication.run(MyBeanMainTest.class, args);}
}