手把手教你写SpringBoot插件02利用ApplicationContextInitializer注入类

Z时代
2024-01-10
分类：综合

1.必须先学会SPI的使用

手把手教你写Spring Boot插件01-SPI规范

2.创建ApplicationContextInitializer字类

利用applicationContext把我们的类注入到Spring 的bean 工厂

主要如果有依赖其他的类，主要要把setLazyInit设置为true，避免循环依赖无法注入


public class EnhancePulg implements ApplicationContextInitializer {
@Override
public void initialize(ConfigurableApplicationContext applicationContext) {
//注册到bean工厂
DefaultListableBeanFactory configurableListableBeanFactory = (DefaultListableBeanFactory) applicationContext.getBeanFactory();
GenericBeanDefinition JpaSqlAspectBeanDefinition  = new GenericBeanDefinition();
JpaSqlAspectBeanDefinition.setBeanClassName("JpaSqlAspect");
JpaSqlAspectBeanDefinition.setBeanClass(JpaSqlAspect.class);
JpaSqlAspectBeanDefinition.setLazyInit(true);
configurableListableBeanFactory.registerBeanDefinition("JpaSqlAspect",JpaSqlAspectBeanDefinition);
GenericBeanDefinition JpaImplBeanDefinition  = new GenericBeanDefinition();
JpaImplBeanDefinition.setBeanClassName("JpaImpl");
JpaImplBeanDefinition.setBeanClass(JpaImpl.class);
JpaImplBeanDefinition.setLazyInit(true);
configurableListableBeanFactory.registerBeanDefinition("JpaImpl",JpaImplBeanDefinition);
}
public void  get(){
        System.out.println("dasdasd");
}
}