spring BeanFactory 的getbean 有几个重载的方法

有四个：（要学会去查看spring的api）
1： T getBean(Class requiredType)
Return the bean instance that uniquely matches the given object type, if any.
2： Object getBean(String name)
Return an instance, which may be shared or independent, of the specified bean.
3： T getBean(String name, Class requiredType)
Return an instance, which may be shared or independent, of the specified bean.
4： Object getBean(String name, Object... args)
Return an instance, which may be shared or independent, of the specified bean.

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