多个PostConstruct方法? [英] Multiple PostConstruct methods?

问题描述

在 Java的文档页中显示了PostConstruct那

It says in Java's documentation page for PostConstruct that

此注释只能注释一种方法

Only one method can be annotated with this annotation

但是我只是尝试使用PostConstruct注释一个独立应用程序的三种方法.没有编译错误，所有这三个错误都可以顺利调用和执行.

But I just tried annotating three methods of a standalone application with PostConstruct. No compile errors, and all three of them are invoked and executed smoothly.

那我想念什么?什么样的类可以并且不能存在多个PostConstruct注释?

So what am I missing? In what kind of class can and cannot exist multiple PostConstruct annotations?

推荐答案

是的，似乎Spring没有遵循此限制.我已经找到了用于处理此注释的代码，该注释为InitDestroyAnnotationBeanPostProcessor，以及特定的方法:

Yes, it's seem Spring doesn't follow this restriction. I have found code to process this annotation which is InitDestroyAnnotationBeanPostProcessor, and the specific method:

public void invokeInitMethods(Object target, String beanName) throws Throwable {
        Collection<LifecycleElement> initMethodsToIterate =
                (this.checkedInitMethods != null ? this.checkedInitMethods : this.initMethods);
        if (!initMethodsToIterate.isEmpty()) {
            boolean debug = logger.isDebugEnabled();
            for (LifecycleElement element : initMethodsToIterate) {
                if (debug) {
                    logger.debug("Invoking init method on bean '" + beanName + "': " + element.getMethod());
                }
                element.invoke(target);
            }
        }
    }

因此，spring支持多个PostConstruct

So, spring support multi PostConstruct

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