JSP form parameters with default values

<html>
  <head><title>Create Person</title></head>
  <body>
    <h1>Enter your details</h1>
    <form action="displayDetails.jsp" method="post">
      <table>
        <tr><td>First name:</td> <td><input type="text" name="firstName" /></td></tr>
        <tr><td>Last name:</td>  <td><input type="text" name="lastName"  /></td></tr>
        <tr><td>Age:</td>        <td><input type="text" name="age"       /></td></tr>
      </table>
      <input type="submit" value="Submit details" />
    </form>
  </body>
</html>

//displayDetails.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>

<html>
  <head><title>Display details</title></head>
  <body>
    <h1>The details that you entered!</h1>
    <table>
      <tr><td>First name</td>
          <td><c:out value="${param.firstName}" /></td>
      </tr>
      <tr><td>Last name</td>
          <td><c:out value="${param.lastName}" /></td>
      </tr>
      <tr><td>Age</td>
          <td><c:out value="${param.age}" /></td>
      </tr>
      <%-- The following two values are not passed from the HTML form
           and are present to show the syntax for specifying default
           values --%>
      <tr><td>Partner's name</td>
          <td><c:out value="${param.partnerName}" default="Unknown name" /></td>
      </tr>
      <tr><td>Partner's age</td>
          <td><c:out value="${param.partnerAge}">
                Unknown age
              </c:out>
          </td>
      </tr>
    </table>
  </body>
</html>

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JSP form parameters with default values : Form « JSP « Java

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