I am using a session scope to store the bean,and i want to project the bean value to the jsp page when needed like this way
request.getSession().setAttribute("bean", bean);
response.sendRedirect("test.jsp");
And in the jsp i am using the below code to get the value on jsp
<% bean1 bean = (bean1) session.getAttribute("bean");
%>
<%= bean.getValue() %>
Instead of using a session scope i want to use a request scope,so can i set my attribute in my servlet in this way
request.setAttribute("bean", bean);
So how can i call it on my jsp
can i say
<% bean1 bean = (bean1) request.getAttribute("bean");
But it is showing error.Or instead of using scriplet how can i show my output using JSTL.
You're not understanding what a redirect is. A redirect is a response you send to the browser so that the browser sends another, new request to the location you redirected to. So, when you call sendRedirect("test.jsp"), the browser will send a new request to test.jsp. And obviously, all the attributes you have stored in the current request won't be available anymore.
It's impossible, without context, to say if a redirect is something you should do in this case, or if you should instead forward to the JSP. A forward is very different from a redirect, since it only transfers the responsibility of the current request and response to another component. In that case, there would be a unique request, and the JSP could find the attribute set by the servlet in the request.
The only thing I can say is that, in a properly designed MVC application, the JSP is used as a view, and there should never be a direct request to the view. Each request should go through a controller.
Related
i have this scenario. User enter some stuff on jsp form in browser and submit. In servlet i process the request and show the jsp page1 to client which has just continue
button. Now on click of continue, i want to forward this request to another jsp page2 with all request parameter present on page1. basically i want to get all request parameters which were present in first request on page 2 also? I am not getting how should i go
for this? I dont think i can use jsp forward as per my understanding it would work only when both when we want to forward from jsp (on server side) not on client side?
There are two ways to implement that:
output all parameters in hidden fields, and submit them in the 2nd request
store everything in the session
Following are a pair of ways to achieve this
Put the information in session object in first request and access it from session object in second.
On the intermediate page displayed, have hidden form elements which will carry the values and send it back on continuing.
You can use Servlet Forward to pass all request parameters to another JSP or Servlet:
getServletContext().getRequestDispatcher("/yourJSP.jsp").forward(request, response);
Servlet forward will forward the existing request to another JSP or Servlet, so all the request parameters and attributes will be available to the destination JSP or Servlet (The reason you can use the Servlet forward is that JSP is also a Servlet after translation).
You may find following resources useful:
Pass data from servlet to jsp
Servlet Redirect vs Forward
I want to pass parameters from one jsp to another.
I have tried using the post method, <jsp:forward/>, but it doesn't work.
I have created a <form> in html (parameters passed using POST), which is submitted to a servlet which processes the request and forwards it to another servlet that displays a page.
From this servlet i have created links to another jsp, passing through the parameters as GETs in the URL. However, I actually want to pass the parameters to another jsp using POST, and then pass it on to another jsp.
What solutions do you have or this problem?
Check out the Request Dispatcher. You need to forward the request to the landing JSP.
http://docs.oracle.com/javaee/6/api/javax/servlet/RequestDispatcher.html
Sounds like you are creating a multipage form that gathers information from the user across several distinct pages. In that case one option is to use hidden fields on a form to store the previous values. This of course means that as the pages progress the amount of data passing back and forth from client to server increases.
You may consider a server side approach by storing the interim values in a database for instance, then only passing a token back to the client. When the next JSP page is submitted, use the token to look up the values in the database.
JSP has built-in request object.when one jsp redirect to another jsp with some parameter, you can get parameter value using this request object.
<%
String param1 = request.getParameter("parameter_name");
%>
you can find example here -
http://www.roseindia.net/jsp/RequestObjectInJSP.shtml
Why don't you call a page on the click of a submit button by creating
an url in the below format (in javascript):- var
url="your_page_name.jsp?value1="+encodeURIComponent(document.getElementById("your_text_field_or_any_other_field_id"));
and then call the page by using your url
document.your_form_name.action=url;
document.your_form_name.submit();
and then use request.getParameter() method either in servlet
or in the jsp that u'v metioned in the url (servlet or the jsp u'll be
calling thorugh u'r jsp).
How can I send a an object got it from a bean in a JSP page to a Servlet after clicking an hyperlink??
something like...
...
<td align="center"><% if(j.getClubActual().isIsResource()){ request.setAttribute("equipo", j.getClubActual());%>
<%= j.getClubActual().getNombre()%><%}%>
</td>
...
But when I try to recover it in the teamServlet, the request object is empty.
Thanks in advance.
What object you are trying to send?
If you want to "send" objects, I think your safest bet is to use HTTP session to do that. You can't send "objects" (or beans) with a hyperlink to a servlet. You can only send parameters values usually in form of strings.
The lifetime of a HTTP request ends when its associated HTTP response is finished sending the data (read: the HTML page generated by JSP). Clicking a link will create a brand new HTTP request which doesn't contain the attributes of any previous request at all.
You need to send the unique identifier of the Java object in question as a request parameter. Ultimately, the HTML must end up to basically look like this:
link
In the servlet, you can get the request parameter as follows:
String clubId = request.getParameter("clubId");
You can use this value to re-obtain the Java object associated with the given ID from some data store.
Club club = clubService.find(Long.valueOf(clubId));
// ...
I am working on a JSP project. I have a page that calls another JSP.
Now the problem is, how to pass or use a variable in the called JSP page in its calling page?
You can save the variable in the HTTPSession or ServletContext object.
And in the calling JSP page, use or check session attribute for the variable.
session.setAttribute(objectId, Object); to set the variable.
session.getAttribute(objectId); to get the variable.
I have a page that calls another jsp
page
The problem lies here in this sentence.
Try to follow MVC. Use JSP just for rendering the View, and Servlet as a Controller.
Here, simple.souther.us, you find simple and awesome tutorials for newbies.
Your design should be
take one input param on page1.jsp
post it to some servlet , process it there, forward request to page1 jsp and pass param taken from page 1 as attribute
See Also
why-business-logic-should-be-moved-out-of-jsp ?
why use<bean:include instead of <jsp:include in struts?
from the documentation for bean:include
Perform an internal dispatch to the specified application component (or external URL) and make the response data from that request available as a bean of type String. This tag has a function similar to that of the standard jsp:include tag, except that the response data is stored in a page scope attribute instead of being written to the output stream. If the current request is part of a session, the generated request for the include will also include the session identifier (and thus be part of the same session).
first hit on google
bean:include works almost like jsp:include except that the result is stored in the page scope. This means that your code on the current page can access the results and manipulate it. See this page.