1.实现InitializingBean重写afterPropertiesSet()方法。
@Component
@Slf4j
public class InitOneTest implements InitializingBean {
@Override
public void afterPropertiesSet() throws Exception {
log.info("InitOneTest init success");
}
}
2.注解@PostConstruct
在类构造方法之后执行
@Component
@Slf4j
public class InitTwoTest {
@PostConstruct
public void init(){
log.info("InitTwoTest init success");
}
}
3.实现CommandLineRunner,重写run()方法
@Component
@Slf4j
@Order(1)// 启动顺序
public class InitThreeTest implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
log.info("InitThreeTest initial success");
}
}
4.实现ApplicationRunner,重写run()方法
@Component
@Slf4j
@Order(2)// 启动顺序
public class InitFourTest implements ApplicationRunner {
@Override
public void run(ApplicationArguments args) throws Exception {
log.info("InitFourTest init success");
}
}
5.实现监听器ApplicationListener
注意点:这种方式在springmvc-spring的项目中使用的时候会出现执行两次的情况。这种是因为在加载spring和springmvc的时候会创建两个容器,都会触发这个事件的执行。这时候只需要在onApplicationEvent
方法中判断是否有父容器即可
@Component
@Slf4j
public class InitFiveTest implements ApplicationListener<ContextRefreshedEvent> {
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
if(event.getApplicationContext().getParent() == null){
log.info("InitFiveTest init success");
}
}
}