An interceptor which sets action properties based on the interfaces an action implements. For example, if the action implements ParameterAware
then the action context's parameter map will be set on it.
This interceptor is designed to set all properties an action needs if it's aware of servlet parameters, the servlet context, the session, etc. Interfaces that it supports are:
ServletContextAware
ServletRequestAware
ServletResponseAware
ParameterAware
RequestAware
SessionAware
ApplicationAware
PrincipalAware
这个连接器是用来设置参数的
自己的action继承了上面的几个接口,那么你所需的参数就会被设置到你的action中