SpringBoot启动时加载方法

方式一：实现ServletContextListener接口

      @Component
      public class SpringBootInitialization1 implements ServletContextListener {
            @Override
	    public void contextInitialized(ServletContextEvent sce) {
		System.out.println("方式一：实现ServletContextListener接口");
	    }
      }

方式二：方法上加注解@PostConstruct

      @Component
      public class SpringBootInitialization2 {
            @PostConstruct
            public static void init() {
		System.out.println("方式二：方法上加注解@PostConstruct");
            }

      }

方式三：实现ServletContextAware接口

@Component
public class SpringBootInitialization3 implements ServletContextAware {

	@Override
	public void setServletContext(ServletContext servletContext) {
		System.out.println("方式三：实现ServletContextAware接口");
	}

}

方式四：实现ApplicationListener接口

@Component
public class SpringBootInitialization4 implements ApplicationListener<ContextRefreshedEvent> {

	@Override
	public void onApplicationEvent(ContextRefreshedEvent event) {
		System.out.println("方式四：实现ApplicationListener<ContextRefreshedEvent>接口");
	}

}

方式五：实现ApplicationRunner接口

@Component
public class SpringBootInitialization5 implements ApplicationRunner {

	@Override
	public void run(ApplicationArguments args) throws Exception {
		System.out.println("方式五：实现ApplicationRunner接口");
	}

}

方式六：实现CommandLineRunner接口

@Component
public class SpringBootInitialization6 implements CommandLineRunner {

	@Override
	public void run(String... args) throws Exception {
		System.out.println("方式六：实现CommandLineRunner接口");

	}

}