bean的初始化和销毁实际是spring本身的特性,这里因为基于spring boot的,所以这里只关注通过annotation来实现的方式;

首先定义配置类:

@Configuration
public class DemoBeanConfiguration {
    @Bean
    public DemoBean getBean() {
        return new DemoBean();
    }
}

----------
public class DemoBean {
    private void init() {
        System.out.println("init");
    }
    
    private void destroy() {
        System.out.println("destroy");
    }
}

然后在@Bean中定义init和destroy方法

    @Bean(initMethod = "init", destroyMethod = "destroy")
    public DemoBean getBean() {
        return new DemoBean();
    }

运行main方法:

    public static void main(String[] args) {
        ConfigurableApplicationContext run = SpringApplication.run(SpringBootDemoApplication.class);
        DemoBean bean = run.getBean(DemoBean.class);
        run.close();
    }

控制台分别打印init和destroy