单项选择题
A.The init method on a filter is called the first time a servlet mapped to that filter is invoked.
B.A filter defined for a servlet must always forward control to the next resource in the filter chain.
C.Filters associated with a named servlet are applied in the order they appear in the web application deployment descriptor file.
D.If the init method on a filter throws an UnavailableException， then the container will make no further attempt to execute it.
多项选择题 Whichthreearetrueaboutservletfilters？（）
单项选择题 All of your JSPs need to have a link that permits users to email the web master. This web application islicensed to many small businesses， each of which have a different email address for the web master. Youhave decided to use a context parameter that you specify in the deployment descriptor， like this： 42.<context-param> 43.<param-name>webmasterEmail</param-name> 44.<param-value>master@example.com</param-value> 45.</context-param> Which JSP code snippet creates this email link？（）
单项选择题 WhichensuresthataJSPresponseisoftype"text/plain"？（）