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关于Servlet Filter，下列说法正确的有（）
- A、Filter其实就是一个Servlet
- B、Filter可以产生response
- C、Filter可以在Servlet被调用之前截获request
- D、Filter可以哟活过来处理统一认证，过滤不雅字句等
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单选题Which is true about the web container request processing model？（）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
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If the init method on a filter throws an UnavailableException， then the container will make no further attempt to execute it.
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多选题关于Servlet Filter，下列说法正确的有（）AFilter其实就是一个ServletBFilter可以产生responseCFilter可以在Servlet被调用之前截获requestDFilter可以哟活过来处理统一认证，过滤不雅字句等
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多选题Which the three are true about servlet filters？（）AA filter must implement the destroy methodBA filter must implement the doFilter methodCA servlet may have multiple filters associated with itDA servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain interfaceEA filter that is part of a filter chain passes control to the next filter in the chain by invoking the filterChain forward methodFFor each element in the web application deployment descriptor， multiple instances of a filter may be created by the web container
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单选题在JAVA EE中，使用Servlet过滤器时，需要在web.xml通过（）元素将过滤器映射到Web资源。A
〈filter〉B
〈filter-mapping〉C
〈servlet〉D
〈servlet-mapping〉
考题
单选题在JAVA EE中，使用Servlet过滤器时，可以在web.xml文件的（）元素中包括〈init-param〉元素。A
〈filter〉B
〈filter-mapping〉C
〈filter-name〉D
〈filter-class〉
考题
多选题下列说法正确的是（）AFilter接口可以帮助我们在WEB应用中实施过滤技术BFilter接口拥有Init（FilterConfig filterConfig）方法CFilterChain是代码的过滤链，通过这个接口把过滤的任务在不同的Filter之间转移DFilterConfig接口代表了Filter的配置EFilterChain接口代表了Filter的配置
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单选题在J2EE中使用Servlet过滤器时，可以在web.xml文件的（）元素中包括＜init-param＞元素。A
＜filter＞B
＜filter-mapping＞C
＜filter-name＞D
＜filter-class＞
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