JSTL Core Tag Example

The <c:if> is a JSTL core tag which is used for testing conditions. It is more or like an if statement in Java which evaluates a condition and executes a block of code if the result is true.

Syntax:

<c:if test="${condition}">
...
..
</c:if>

Example of <c:if> tag

Let's first create Student bean class:
package net.javaguides.jstl;

public class Student {

    private String firstName;
    private String lastName;
    private boolean goldCustomer;

    public Student(String firstName, String lastName, boolean goldCustomer) {
        super();
        this.firstName = firstName;
        this.lastName = lastName;
        this.goldCustomer = goldCustomer;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public boolean isGoldCustomer() {
        return goldCustomer;
    }

    public void setGoldCustomer(boolean goldCustomer) {
        this.goldCustomer = goldCustomer;
    }
}
In this example, we will test if the student is a gold member or not using <c:if> tag:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@ page import="java.util.*,net.javaguides.jstl.Student" %>

<%
 // just create some sample data ... normally provided by MVC
 List<Student> data = new ArrayList<>();

 data.add(new Student("Ramesh", "Fadatare", false));
 data.add(new Student("John", "Cena", false));
 data.add(new Student("Tom", "Cruise", false));
 data.add(new Student("Tony", "Stark", false));
 data.add(new Student("Prakash", "Jadhav", true));
 pageContext.setAttribute("myStudents", data);
%>

<html>
<body>
 <table border="1">
 <tr>
  <th>First Name</th>
  <th>Last Name</th>
  <th>Gold Customer</th>
 </tr> 
 <c:forEach var="tempStudent" items="${myStudents}">  
  <tr>
   <td>${tempStudent.firstName}</td>
   <td>${tempStudent.lastName}</td>
   <td>
    <c:if test="${tempStudent.goldCustomer}">
     Special Discount
    </c:if>    
    <c:if test="${not tempStudent.goldCustomer}">     -
    </c:if>    
   </td> 
  </tr>  
 </c:forEach>
 </table>
</body>
</html>

Output

Notice that the output here, we have iterated over each student and we have checked the condition for a special discount of each student and printed the same against each student.



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