A. It is impossible to determine the deepest nesting depth because it is impossible for tag handlers that extend SimpleTagSupport to communicate with their parent and child tags
B. Create a private non-static attribute in the tag handler class called count of type int initialized to      oIncrement count in the doTag method. If the tag has a body， invoke the fragment for that body. Otherwise， output the value of count
C. Start a counter at 1. Call getChildTags（）. If it returns null， output the value of the counter.      Otherwise， increment counter and continue from where getChildTags（） is called. Skip      processing of the body.
D. If the tag has a body， invoke the fragment for that body. Otherwise， start a counter at 1. Call      getParent（）. If it returns null， output the value of the counter. Otherwise， increment the counter      and continue from where getParent（） is called.

A. JspWriter w = pageContext.getOut（）；w.print（“Company”）；
B. JspWriter w = pageContext.getWriter（）；w.print（“Company”）；
C. JspWriter w = new JspWriter（pageContext.getOut（））； w.print（“Company”）；
D. JspWriter w = new JspWriter （pageContext.getResponse（））； w.print（“Company”）；

A. new InputStream（“/WEB-INF/nyressrc.bin”）；
B. ctx.getInputStream（“/WEB-INF/nyresrc.bin”）；
C. ctx.getresourceAsStream（“/WEB-INF/nyresrc.bin”）；
D. new InputStream（“/WEB-INF/nyresrc.bin”）；
E. getClass（）.getResourceAsStream（“/WEB-INF/nyresrc.bin”）；

A. HttpSession session = request.getSession（）；
B. HttpSession session = request.getSession（id）；
C. HttpSession session = request.getSession（true）；
D. HttpSession session = request.getSession（false）；
E. HttpSession session = request.getSession（“jsessionid”）

A. The developer must ensure that every URL is properly encoded using the appropriate URL rewriting APIs
B. The developer must provide an alternate mechanism for managing sessions and abandon theHttpSession mechanism entirely
C. The developer can ignore this issue. Web containers are required to support automatic URL rewriting when cookies are not supported
D. The developer must ass the string ？id= to the end of every URL to ensure that the conversion with the browser can continue.

A.
B.
C.
D.
E.

A. public void valueUnbound（HttpSessionEvent ev）{...}
B. public void sessionPassivated（HttpSessionEvent ev）{...}
C. public void sessionDidActivate（HttpSessionEvent ev）{...}
D. public void sessionWillPassivate（HttpSessionEvent ev）{...}

A. A filter must implement the destroy method
B. A filter must implement the doFilter method
C. A servlet may have multiple filters associated with it
D. A servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain  interface
E. A filter that is part of a filter chain passes control to the next filter in the chain by invoking the filterChain forward method
F. For each  element in the web application deployment descriptor， multiple instances of a filter may be created by the web container

A.A
B.B
C.C
D.D
E.E

A. The attribute foo is placed in the application
B. A ServletContextListener registered for that servlet is notified
C. A ServletAttributeListener registered for that servlet is notified
D. An HttpSessionAttributeListener registered for that servlet is notified