Validating User Input

一、Validating User Input Using JSTL Actions
    <%@ page contentType="text/html" %>
    <%@ taglib prefix="c" uri="" %>
     
   
     
       
     
     
     
       

         
         
           
             
             
           
           
             
             
           
           
             
             
           
           
             
             
             
           
           
             
             
           
           
             
             
             
           
             
             
           
           
             
             
           
           
             
             
           
           
             
             
             
           
           
             
               
                 
               
               
                 
               
               
                 
               
               
                 
               
             
           
           
             
             
           
           
             
             
           
           
             
           
         

	Please enter your Name
Name:	value="">
	Please enter your Birth Date
Birth Date:	value="">	(Use format yyyy-mm-dd)
	Please enter your Email Address
Email Address:	value="">	(Use format >
	Please select a valid Gender
Gender:	Male                                           Female                                                                               Male                                           Female
	Please enter a Lucky Number between 1 and 100
Lucky number:	value="">	(A number between 1 and 100)
	Please select only valid Favorite Foods
Favorite Foods:	${pizzaSelected ? 'checked' : ''}>Pizza                                   ${pastaSelected ? 'checked' : ''}>Pasta                                   ${chineseSelected ? 'checked' : ''}>Chinese

       

     
   

    The JSTL action is used with an EL expression that evaluates to true only if the condition is true .

二、Validating User Input Using a Bean
    ...
          class="com.ora.jsp.beans.userinfo.UserInfoBean">
     
   
   

     
     
                  test="${param.submitted && userInfo.userNameValid == false}">
         
         
       
       
         
         
       
       
         
         
       
       
         
         
         
       
       
         
         
       
       
         
         
       
       
         
         
       
       
         
         
       
        ...

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	Please enter your Name
Name:	value="">
	Please enter a valid Birth Date
Birth Date:	value="">	(Use format yyyy-mm-dd)
	Please select a valid Gender
Gender:	Male                                   Female                                                               Male                                   Female
	Please select only valid Favorite Foods
Favorite Foods:	${userInfo.pizzaSelected ? 'checked' : ''}>Pizza                           ${userInfo.pastaSelected ? 'checked' : ''}>Pasta                           ${userInfo.chineseSelected ? 'checked' : ''}>Chinese