CODEWITHSUNDEEP
javajsp
Learner
Learner

Reputation: 21393

Accessing request attributes in JSP

I am practicing JSP with small programs and came across small issue.

I have my first jsp page with a form and a code that sets the request attribute.

<form action="process.jsp" method="post">

    User: <input type="text" name="userName">
    <br/><br/>

    <input type="submit" value="Submit"/>

</form>

<%request.setAttribute("sampleKey","myValue");%>

This is how my process.jsp looks like:

Welcome <%=request.getParameter("userName")%>
<br/>
The attribute is <%=request.getAttribute("sampleKey")%>

When I access first page and submit to process.jsp page then I was expecting the request attribute will have its value, but I am getting null here.

This is just a sample program for learning, I am aware that we should not use scriplets.

What is the issue here, can you please tell me?

Upvotes: 3

Views: 5473

Answers (3)

user2575725
user2575725

Reputation:

Problem is you are using html from to submit request to process.jsp. Hence your request attribute gets lost.

Option 1, Use hidden field in the same form and get it using req.getParameter().

Option 2, Use session attribute instead of request.

Upvotes: 0

Rakesh Raka
Rakesh Raka

Reputation: 26

The issue is in <% request.setAttribute("sampleKey","myValue"); %> this code because of request . use

instead of

and then you can get in process.jsp page by this type .

session.getAttribute("sampleKey");

Upvotes: 0

Ravi K Thapliyal
Ravi K Thapliyal

Reputation: 51711

The issue is that when you submit the <form>, it makes a new POST request to process.jsp and hence any request attributes set before aren't available anymore. What you need is to use the session scope instead, which will keep its attributes across several requests coming from the same user.

So, in your JSP form a session attribute set as

<% session.setAttribute("sampleKey","myValue"); %>

can then be retrieved in your process.jsp as

Welcome ${param.userName}
<br/>
The attribute is ${sampleKey}

Upvotes: 3

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