Spring Application Tutorial-2 method injection

We usually use the lookup method injection, which allows spring to replace the abstract or concrete method of a bean, returning the result of the other bean in the lookup container, which is usually a non-singleton bean.

The scope of a stateless bean can generally be configured as a singleton single instance, if we inject prototype BEANB into the beana of Singleton, and want to call Beana getbeanb () each time Can return a new BEANB, this requirement cannot be achieved using traditional injection methods . Because singleton beans inject The associated bean only once, although the scope of the BEANB is the prototype type, the returned object is not the bean that was injected the first time.

If you want to return a new BEANB each time you call Beana's GETBEANB (), an alternative is to have the bean implement the Beanfactoryaware interface, allowing Beana to access the container's references, and the following code can be implemented in a way that achieves the purpose:

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Public class bean_a implements beanfactoryaware{

Private bean_b bean_b= null; Private beanfactory beanfactory= null; @Override Public void setbeanfactory (beanfactory beanfactory) throws beansexception { This . beanfactory=beanfactory;     } Public bean_b getbean_b () { return beanfactory. Getbean ("Bean_b", Bean_b. class);     }} 

Spring Application Tutorial-2 method injection