/**
* 1) object creation: Single case/Multiple cases
* scope= "singleton", default value, default is Singleton "service/DAO/Tool Class"
* scope= "prototype", multiple examples; "Action object"
*
* 2) When to create?
* scope= "Prototype" creates an object when it is used.
* scope= "Singleton" before startup (container initialization), the bean has been created and the entire application has only one.
* 3) whether to delay the creation
* lazy-init= "false" defaults to false and does not delay creation, that is, when the object is created at startup
* lazy-init= "true" deferred initialization, objects are created when objects are used
* (only valid for single case)
* 4) After creating the object, Initialize/Destroy
* init-method= "Init_user" corresponds to the Init_user method of the object, after the object creation love executes "
* destroy-method= "Destroy_user" "is executed when invoking the Destriy method of the Container object (Container implementation Class)"
Spring Object Scope Property