亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

this represents the instance object of the current class. The current class is hosted by Spring. Spring creates the instance object of the class through the reflection mechanism, so we do not need to explicitly use the key value new to create the instance object of the class

Beans in spring are singletons by default, so this refers to the controller object

The controller class object is created and hosted by spring for you, and is a singleton by default