初始化和销毁

初始化方法

@PostConstruct

implements InitializingBean 覆盖afterPropertiesSet() 方法

@Bean(initMethod = "初始化方法")

如果同时存在按照上述顺序执行


public class Bean1 implements InitializingBean {
    private static final Logger log = LoggerFactory.getLogger(Bean1.class);

    @PostConstruct
    public void init1() {
        log.debug("初始化1");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        log.debug("初始化2");
    }

    public void init3() {
        log.debug("初始化3");
    }
}


[DEBUG] 11:02:30.164 [main] com.onethink.a07.Bean1              - 初始化1 
[DEBUG] 11:02:30.164 [main] com.onethink.a07.Bean1              - 初始化2 
[DEBUG] 11:02:30.164 [main] com.onethink.a07.Bean1              - 初始化3

Aware 方法的扩展

aware方法会在 @PostConstruct 之前执行


public class Bean1 implements InitializingBean, BeanNameAware, ApplicationContextAware {
    private static final Logger log = LoggerFactory.getLogger(Bean1.class);

    @PostConstruct
    public void init1() {
        log.debug("初始化1");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        log.debug("初始化2");
    }

    public void init3() {
        log.debug("初始化3");
    }

    @Override
    public void setBeanName(String name) {
        log.debug("初始化4");
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        log.debug("初始化5");

    }
}


[DEBUG] 11:13:52.334 [main] com.onethink.a07.Bean1              - 初始化4 
[DEBUG] 11:13:52.334 [main] com.onethink.a07.Bean1              - 初始化5 
[DEBUG] 11:13:52.334 [main] com.onethink.a07.Bean1              - 初始化1 
[DEBUG] 11:13:52.334 [main] com.onethink.a07.Bean1              - 初始化2 
[DEBUG] 11:13:52.334 [main] com.onethink.a07.Bean1              - 初始化3

销毁方法

@PreDestroy

implements DisposableBean 重写destroy()

@Bean(destroyMethod = "destroy3")


public class Bean2 implements DisposableBean {
    private static final Logger log = LoggerFactory.getLogger(Bean2.class);

    @PreDestroy
    public void destroy1() {
        log.debug("销毁1");
    }

    @Override
    public void destroy() throws Exception {
        log.debug("销毁2");
    }

    public void destroy3() {
        log.debug("销毁3");
    }
}


public class A07_1 {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(A07_1.class, args);
        context.close();
     
    }

    @Bean(destroyMethod = "destroy3")
    public Bean2 bean2() {
        return new Bean2();
    }
}


[DEBUG] 11:02:30.631 [main] com.onethink.a07.Bean2              - 销毁1 
[DEBUG] 11:02:30.631 [main] com.onethink.a07.Bean2              - 销毁2 
[DEBUG] 11:02:30.631 [main] com.onethink.a07.Bean2              - 销毁3