CODEWITHSUNDEEP
javajsphttp-redirect
PROXY
PROXY

Reputation: 629

Redirect pages in JSP?

I have to design several pages in jsp. After clicking on the submit button on the first page, the page should be automatically redirected to the second page.

Can you help with a quick example or a link to a tutorial that demonstrates how to implement this?

Upvotes: 56

Views: 305314

Answers (6)

Du-Lacoste
Du-Lacoste

Reputation: 12757

This should do the trick.

Click --> Submit Button on the First page

Add the below Code into Second Page, it will redirect to home.html page.

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body>
<c:redirect url="home.html"/>
</body>
</html>

Upvotes: 0

Hardik Thaker
Hardik Thaker

Reputation: 3078

Extending @oopbase's answer with return; statement.

Let's consider a use case of traditional authentication system where we store login information into the session. On each page we check for active session like,

/* Some Import Statements here. */

if(null == session || !session.getAttribute("is_login").equals("1")) {
    response.sendRedirect("http://domain.com/login");
}

// ....

session.getAttribute("user_id");

// ....
/* Some More JSP+Java+HTML code here */

It looks fine at first glance however; It has one issue. If your server has expired session due to time limit and user is trying to access the page he might get error if you have not written your code in try..catch block or handled if(null != session.getAttribute("attr_name")) everytime.

So by putting a return; statement I stopped further execution and forced to redirect page to certain location.

if(null == session || !session.getAttribute("is_login").equals("1")) {
    response.sendRedirect("http://domain.com/login");
    return;
}

Note that Use of redirection may vary based on the requirements. Nowadays people don't use such authentication system. (Modern approach - Token Based Authentication) It's just an simple example to understand where and how to place redirection(s).

Upvotes: 1

T04435
T04435

Reputation: 13992

Hello there: If you need more control on where the link should redirect to, you could use this solution.

Ie. If the user is clicking in the CHECKOUT link, but you want to send him/her to checkout page if its registered(logged in) or registration page if he/she isn't.

You could use JSTL core LIKE:

<!--include the library-->
<%@ taglib prefix="core" uri="http://java.sun.com/jsp/jstl/core" %>

<%--create a var to store link--%>
<core:set var="linkToRedirect">
  <%--test the condition you need--%>
  <core:choose>
    <core:when test="${USER IS REGISTER}">
      checkout.jsp
    </core:when>
    <core:otherwise>
      registration.jsp
    </core:otherwise>
  </core:choose>
</core:set>

EXPLAINING: is the same as...

 //pseudo code
 if(condition == true)
   set linkToRedirect = checkout.jsp
 else
   set linkToRedirect = registration.jsp

THEN: in simple HTML...

<a href="your.domain.com/${linkToRedirect}">CHECKOUT</a>

Upvotes: 2

SpaceTrucker
SpaceTrucker

Reputation: 13546

This answer also contains a standard solution using only the jstl redirect tag:

<c:redirect url="/home.html"/>

Upvotes: 36

BalusC
BalusC

Reputation: 1108557

Just define the target page in the action attribute of the <form> containing the submit button.

So, in page1.jsp:

<form action="page2.jsp">
    <input type="submit">
</form>

Unrelated to the problem, a JSP is not the best place to do business stuff, if you need to do any. Consider learning servlets.

Upvotes: 12

oopbase
oopbase

Reputation: 11385

<%
    String redirectURL = "http://whatever.com/myJSPFile.jsp";
    response.sendRedirect(redirectURL);
%>

Upvotes: 120

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