什么时候实例化一个spring bean [英] when is a spring bean instantiated

问题描述

ApplicationContext ctx = new ClassPathXmlApplicationContext(
    "com/springinaction/springidol/spring-idol.xml");
Performer performer = (Performer) ctx.getBean("duke");
performer.perform();

在上面，bean实例化的时间，创建ApplicationContext的时间或getBean（）的时间被调用？

In the above, when are the beans instantiated, when the ApplicationContext is created or when the getBean() is called?

推荐答案

假设bean是单例，并且没有配置为延迟初始化，那么它是在上下文时创建的启动了。 getBean（）只是把它搞砸了。

Assuming the bean is a singleton, and isn't configured for lazy initialisation, then it's created when the context is started up. getBean() just fishes it out.

Lazy-init bean只会在第一次引用时初始化，但是这个不是默认值。只有在第一次引用时才会创建范围内的bean（例如原型范围）。

Lazy-init beans will only be initialised when first referenced, but this is not the default. Scoped beans (e.g. prototype-scoped) will also only be created when first referenced.

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