bean的销毁_销毁bean需要实现什么类-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangwangyancom/article/details/127766952

该博客详细阐述了Spring框架中Bean的销毁过程，包括实现DisposableBean接口、XML配置的destroy方法以及@PreDestroy注解的使用。在Bean的生命周期结束时，会依次调用这些销毁方法。同时，文章介绍了如何在代码中触发Bean的销毁，通过ApplicationContext.getBeanFactory().destroyBean()方法。

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1、单词记忆

[dɪˈspəʊzəbl] disposable 用后即丢弃的。
[ˈnesəsəri] necessary 必要的

2、收集过程
registerdisposableBeanIfNecessary
1、实现disposableBean接口
2、xml属性中的destory
3、@preDestroy收集

public DisposableBeanAdapter(Object bean, String beanName, RootBeanDefinition beanDefinition,
			List<BeanPostProcessor> postProcessors, @Nullable AccessControlContext acc) {

		Assert.notNull(bean, "Disposable bean must not be null");
		this.bean = bean;
		this.beanName = beanName;
		//1、disposableBean
		this.invokeDisposableBean =
				(this.bean instanceof DisposableBean && !beanDefinition.isExternallyManagedDestroyMethod("destroy"));
		this.nonPublicAccessAllowed = beanDefinition.isNonPublicAccessAllowed();
		this.acc = acc;
		//1、destroy   xml属性
		String destroyMethodName = inferDestroyMethodIfNecessary(bean, beanDefinition);
		if (destroyMethodName != null && !(this.invokeDisposableBean && "destroy".equals(destroyMethodName)) &&
				!beanDefinition.isExternallyManagedDestroyMethod(destroyMethodName)) {
			this.destroyMethodName = destroyMethodName;
			Method destroyMethod = determineDestroyMethod(destroyMethodName);
			if (destroyMethod == null) {
				if (beanDefinition.isEnforceDestroyMethod()) {
					throw new BeanDefinitionValidationException("Could not find a destroy method named '" +
							destroyMethodName + "' on bean with name '" + beanName + "'");
				}
			}
			else {
				Class<?>[] paramTypes = destroyMethod.getParameterTypes();
				if (paramTypes.length > 1) {
					throw new BeanDefinitionValidationException("Method '" + destroyMethodName + "' of bean '" +
							beanName + "' has more than one parameter - not supported as destroy method");
				}
				else if (paramTypes.length == 1 && boolean.class != paramTypes[0]) {
					throw new BeanDefinitionValidationException("Method '" + destroyMethodName + "' of bean '" +
							beanName + "' has a non-boolean parameter - not supported as destroy method");
				}
				destroyMethod = ClassUtils.getInterfaceMethodIfPossible(destroyMethod);
			}
			this.destroyMethod = destroyMethod;
		}
		//3、 @preDestroy收集
		this.beanPostProcessors = filterPostProcessors(postProcessors, bean);
	}