Spring自定义Bean创建与销毁方式的总结

深藏阁楼爱情的钟 2022-05-22 04:08 155阅读 0赞

### 1.注解方式 ###

在 bean 初始化时会经历几个阶段，首先可以使用注解 `@PostConstruct`, `@PreDestroy` 来在 bean 的创建和销毁阶段进行调用:

@Component
    public class AnnotationBean { 
        private final static Logger LOGGER = LoggerFactory.getLogger(AnnotationBean.class);
    
        @PostConstruct
        public void start(){
            LOGGER.info("AnnotationBean start");
        }
    
        @PreDestroy
        public void destroy(){
            LOGGER.info("AnnotationBean destroy");
        }
    }

### 2.实现InitializingBean, DisposableBean接口 ###

@Service
    public class SpringLifeCycleService implements InitializingBean,DisposableBean{ 
        private final static Logger LOGGER = LoggerFactory.getLogger(SpringLifeCycleService.class);
        @Override
        public void afterPropertiesSet() throws Exception {
            LOGGER.info("SpringLifeCycleService start");
        }
    
        @Override
        public void destroy() throws Exception {
            LOGGER.info("SpringLifeCycleService destroy");
        }
    }

### 3.JAVA Config方式 ###

@Configuration
    public class LifeCycleConfig { 
    
    
        @Bean(initMethod = "start", destroyMethod = "destroy")
        public SpringLifeCycle create(){
            SpringLifeCycle springLifeCycle = new SpringLifeCycle() ;
    
            return springLifeCycle ;
        }
    }
    
    public class SpringLifeCycle{ 
    
        private final static Logger LOGGER = LoggerFactory.getLogger(SpringLifeCycle.class);
        public void start(){
            LOGGER.info("SpringLifeCycle start");
        }
    
    
        public void destroy(){
            LOGGER.info("SpringLifeCycle destroy");
        }
    }

### 4. XML配置方式 ###