SpringBoot启动时初始化参数

1、通过@PostConstruct注解进行初始化

@Component
public class InitParam {
    @PostConstruct
    public void init(){
        System.out.println("==========@PostConstruct初始化");
    }
}

2、通过实现InitializingBean接口，重写afterPropertiesSet方法进行初始化

@Component
public class InitParam implements InitializingBean{
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("==========实现InitializingBean接口初始化");
    }
}

3、通过监听器方式，实现ApplicationListener，重写onApplicationEvent方法

@Component
public class InitParam implements ApplicationListener<ContextRefreshedEvent> {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
        System.out.println("==========实现ApplicationListener监听器初始化");
    }
}

4、通过实现CommandLineRunner接口，Spring Boot项目启动时会执行run方法

@Component
public class InitParam implements CommandLineRunner {
    @Override
	public void run(String... args) throws Exception {
        System.out.println("==========实现CommandLineRunner接口初始化");
    }
}