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| JSP的形式参数，默认值 |
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<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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