You are creating a library of custom tags that mimic the HTML form tags. When the user submits a formthat fails validation， the JSP form is forwarded back to the user. The<t：textField> tag must support the ability to re-populate the form field with the request parameters from theuser’s last request. For example， if the user entered "Samantha" in the text field called firstName， then theform is re-populated like this：

<input type=’text’ name=’firstName’ value=’Samantha’ />

 Which tag handler method will accomplish thisgoal？（）

单项选择题WhichstatementistrueifthedoStartTagmethodreturnsEVAL_BODY_BUFFERED？（）

A.The tag handler must implement BodyTag.
B.The doAfterBody method is NOT called.
C.The setBodyContent method is called once.
D.It is never legal to return EVAL_BODY_BUFFERED from doStartTag.

单项选择题Assume the tag handler for a st：simple tag extends Simple Tag Support. In what way can scriptlet code beused in the body of st：simple？（）

A.Set the body content type to JSP in the TLD
B.Scriptlet code is NOT legal in the body of st：simple.
C.Add scripting-enabled="true" to the start tag for the st：simple element
D.Add a pass-through Classic tag with a body content type of JSP to the body of st：simple， and place the scriptlet code in the body of that tag

多项选择题Given： 11.<% java.util.Map map = new java.util.HashMap（）； 12.request.setAttribute（ map ， map）； 13.map.put（ a ，  b ）； 14.map.put（ b ，  c ）； 15.map.put（ c ，  d ）； %> 16.<%-- insert code here --%> Which three EL expressions， inserted at line 16， are valid and evaluate to  d ？（）

A.${map.c}
B.${map[c]}
C.${map["c"]}
D.${map.map.b}
E.${map[map.b]}

单项选择题You are building a dating web site. The client’s date of birth is collected along with lots of other information.You have created an EL function with the signature： calcAge（java.util.Date）：int and it is assigned to the name， age， in the namespace， funct. In one of your JSPsyou need to print a special message to clients who are younger than 25.  Which EL code snippet will returntrue for this condition？（）

A.${calcAge（client.birthDate） < 25}
B.${calcAge[client.birthDate] < 25}
C.${funct：age（client.birthDate） < 25}
D.${funct：age[client.birthDate] < 25}
E.${funct：calcAge（client.birthDate） < 25}

单项选择题You are creating an error page that provides a user-friendly screen whenever a server exception occurs.You want to hide the stack trace， but you do want to provide the exception’s error message to the user sothe user can provide it to the customer service agent at your company.  Which EL code snippet inserts thiserror message into the error page？（）

A.Message： <b>${exception.message}</b>
B.Message： <b>${exception.errorMessage}</b>
C.Message： <b>${request.exception.message}</b>
D.Message： <b>${pageContext.exception.message}</b>
E.Message： <b>${request.exception.errorMessage}</b>