题目内容

下面关于过滤器的生命周期的描述,正确的是( )

A. 当客户请求访问的URL与为过滤器映射的URL匹配时,Servlet容器将先创建过滤器对象,再依次调用init()、doFilter()和destroy()方法
B. 当客户发出的请求URL与为过滤器映射的URL匹配时,Servlet容器将调用过滤器的doFilter()方法
C. 当Web应用终止时,Servlet容器将先调用过滤器对象的destroy()方法,然后销毁过滤器对象
D. 当Web应用启动时,Servlet容器会初始化web.xml中配置的过滤器

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下面选项,能解决POST提交方式,参数的中文乱码问题的是( )

A. public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException { response.setContentType("text/html;charset=UTF-8"); chain.doFilter(request, response); }
B. public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException { request.setCharacterEncoding("UTF-8"); chain.doFilter(request, response); }
C. public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException { response.setCharacterEncoding("UTF-8"); chain.doFilter(request, response); }
D. public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException { request.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); chain.doFilter(request, response); }

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下面选项中,与过滤器有关的接口是( )

A. javax.servlet.Filter
B. javax.servlet.FilterChain
C. javax.servlet.FilterConfig
D. javax.servlet.ServletConfig

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已知,在web.xml文件中元素的配置信息如下:RequestFiltercn.itcast.RequestFilter以下选项中,能够使RequestFilter为应用根目录下的out.jsp提供过滤的配置是( )

A. RequestFilter/out.jsp
B. cn.itcast.RequestFilter/out.jsp
C. RequestFilter/out
D. RequestFilter/*

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过滤器配置中,用于匹配用户请求的URL的元素是____。

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