Here, protocol information is retrieved from the request object (by means of the EL's pageContext implicitobject) and tested using a simple string comparison.
It might seem limiting to need to explicitly specify the MRO of an object rather than rely on its implicit resolution through inheritance syntax.
需要显式地指定对象的MRO,而不是依赖于通过继承语法建立的隐式解析,这似乎不太方便。
3
Support for multiple interfaces per object: in CORBA, the interface identifier is implicit because only one object interface is supported, whereas DCOM supports multiple interfaces per object.