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Asked: 2026-05-18T02:17:33+00:00

I’m practising a bit on JSP and want to create a simple formular field.

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I’m practising a bit on JSP and want to create a simple formular field. The code below is working properly. Now i want that the last input stays in the formular fields. So when i type in a value “password” and a “name” both values should stay in the formular field no matter what the result of the if-else statement is.

For example i type in “user” and “1234” and press submit the formular fields get cleared and i don’t want that. The two values shall stay there after submitting. Sincerly i have no good idea how to solve this problem.

My suggestion would be to use application.setAttribute(“”,) and application.getAttribute(“”), but i don’t know how. I would be glad for any advise. Thank you! 

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
          "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de">

<head>
  <title>Practice</title>
</head>

<body>

<h2>Practice</h2>
<h3>Please enter your name and the password.</h3>
<form method="post" action="">
  <table>
<tr><td style="text-align:center">Name</td>
<td><input type="text" name="name" size="80" /></td>
</tr>
<tr><td style="text-align:center">Password</td>
<td><input type="text" name="password" size="80" /></td>
</tr>
<tr><td><input type="submit" value="Send" /></td>
<td><input type="reset" value="Reset" /></td>
</tr>
</table>
</form>

<%-- Testing name and password. --%>
<% String name = request.getParameter("name");
   String password = request.getParameter("password");
   if (name != null && name.equals("user") && password != null && password.equals("1234"))
     {
%>
       <p>Your Input is correct!</p>
<%   }

   else
     {
%>
       <p>Your input is not correct!</p>
<%   }
%>

</body>


</html>
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1 Answer

  1. Editorial Team

    Just fill their value attribute with the submitted value. In normal JSP EL that would be:

    <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
...
<input type="text" name="username" value="${fn:escapeXml(param.username)}" />
<input type="password" name="password" value="${fn:escapeXml(param.password)}" />

    The ${param.username} does basically the same as the following ugly scriptlet <% if (request.getParameter("username") != null) { out.print(request.getParameter("username")); } %>, only in a much more clean and consice way.

    The JSTL fn:escapeXml() function is there to prevent you from XSS attacks. Otherwise users would be able to enter "><script>alert('xss');</script> as name and get it executed (of course with a more malicious javascript which sends the cookies to another server for example instead of a simple alert).

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