I need to populate some request with data and redirect back. Is there Spring RedirectAttributes analog for Java EE? I have searched and found 2 solutions, but they also have limitation:
Response.sendRedirect()
In this case I will lost all destroys request attributes. I can use Session attributes but in this case I need some mechanism that can determine when redirect comes in or when there is no redirect and data must be removed.
getRequestDispatcher(String path).forward(request,response)
The problem with path - I need to send redirect to URL not to give something jsp or Servlet by name. Is there any way to "convert" redirect URL to path? For example how I can go forward to
"http://localhost:8080/WebAppname/"?
You can use the sendRedirect and pass the parameters as part of the query string. So what you would be redirecting can be something like below
http://localhost:8080/WebAppname/myRedirect.action?param1=value1¶m2=value2
Related
I have a scenario where from one page in AEM, I need to call another AEM page in the same application and I need to pass some hidden parameters. I choose to do it via POST and below are the steps which I followed:
From page "A", I did a form submission via POST to the sling servlet and passed some parameters.
2. In the servlet, using request dispatcher I redirected the same request and response to a different page in doPost method using the following code snippet:
request.getRequestDispatcher("/content/company/en/apps/welcomepage.html").forward(request, response);
When I run the code, I am able to call the servlet through form submission but I am not able to redirect to a new page. I see the below error in logs:
18.10.2017 14:41:00.802 ERROR [127.0.0.1 [1508352060795] POST /bin/rap/welcomepage HTTP/1.1] org.apache.sling.servlets.post.impl.operations.ModifyOperation Exception during response processing.
javax.jcr.nodetype.ConstraintViolationException: No matching property definition: appointmentTypeId = platform001d
at org.apache.jackrabbit.oak.jcr.delegate.NodeDelegate.setProperty(NodeDelegate.java:522)
at org.apache.jackrabbit.oak.jcr.session.NodeImpl$35.perform(NodeImpl.java:1375)
at org.apache.jackrabbit.oak.jcr.session.NodeImpl$35.perform(NodeImpl.java:1363)
at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.perform(SessionDelegate.java:208)
at org.apache.jackrabbit.oak.jcr.session.ItemImpl.perform(ItemImpl.java:112)
at org.apache.jackrabbit.oak.jcr.session.NodeImpl.internalSetProperty(NodeImpl.java:1363)
If I try the same code in doGet method it works fine. Also if I use response.sendRedirect("/content/company/en/apps/welcomepage.html") it works fine too. But the problem with this is it initiates it as a new request to the page and it looses all the parameters which I get from the form submission. Could someone please let me know like how can I redirect a request to a page in AEM via POST since I need to pass some hidden parameters whic should not be visible in the url ?
Here is the way I understand your question
User visits page "A"
User fills a form, then submits.
Your custom servlet handles the submitted POST request and calls:
request.getRequestDispatcher("/content/company/en/apps/welcomepage.html").forward(request, response);
You get the ConstraintViolationException
Why do you get this exception?
Since you are using forward the POST request is forwarded to /content/company/en/apps/welcomepage.html that node is most likely of type cq:Page, which has constraints on which properties can be added. Think of it as a simple post request trying to store parameters on the cq:Page node.
What can you do?
Since I don't understand your use-case and particularly why you need to preserve the submit params, I cannot recommend a specific solution. However, since you don't want the parameters in the URL, here is a potential solution you can try:
In your servlet handler, see those hidden params to cookies on the response.
use response.sendRedirect("/content/company/en/apps/welcomepage.html")
On any of the components in /content/company/en/apps/welcomepage.html, you can get the request cookies and process them however you like. same way you wanted to process those hidden params.
Now the flow becomes:
User visits page "A"
User fills a form, then submits.
Your custom servlet handles the submitted POST request, adds your special params to cookies on the response, then calls response.sendRedirect("/content/company/en/apps/welcomepage.html")
User's browser receives a 301 response with the cookies, sets the cookies in the browser then requests "/content/company/en/apps/welcomepage.html"
Your components handle the request and get the params from the cookies, then retuns the appropriate response.
On Form Submit my url changes from
localhost:8080/Workflow/admin/GetReports?fname=Form1
to
localhost:8080/Workflow/admin/EditReport
Form action is EditReport(Servlet Name).
Now on EditReport i perform the databse operations and forward the request to the GetReports?fname=Formname Servlet using Request Dispatcher.So that i am on the same page which is the first one (1) i started from.
Now Everything works fine on the .jsp page But the url remains unchanged that is the second one (2).
So how to rewrite the url i.e. from admin/EditReport to /admin/GetReports?fname=Form1
Are you using dispatcher.forward because you are setting some Attributes in
the Request?
If not, then you don't need to use Forward. Instead of that, use response.sendRedirect("url for GetReports?fname=Form1")
But If you are setting some Attributes in the request, then I am wondering if your workflow is a correct one because URLs like this "Workflow/admin/GetReports?fname=Form1" should Not be arrived upon after doing some processing. They should be simple HTTP GET requests only.
I'm looking for an example using MultiPageMessagesSupport from pretty faces.
<lifecycle>
<phase-listener>com.ocpsoft.pretty.faces.event.MultiPageMessagesSupport</phase-listener>
</lifecycle>
After a click on a h:commandButton I POST-REDIRECT-GET to my Home with prettyfaces.
I'd like to pass a facesMessages: How do you make this ?
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Hey Man The Message is There Youhouhou, So CRAZY!!");
return "pretty:home";
FacesMessages are stored as request attributes. Since you execute a redirect, the server will start a new request, so you will loose all the attributes from the last request. You could:
Store the messages in session, retrieve them, store them as request attributes (using FacesContext.getCurrentInstance().addMessage) and remove them from session. This is the naive solution.
Searching more on the net, looks like you can use the FlashScope to solve this problem. Refer to Adding faces message to redirected page using ExternalContext.redirect() and JSF 2.1 Redirect Preserving error message
My Servlet response type is html and my response contains a hyperlink to another web site.So, now i want to capture the information about whether the user clicked the link or not? and also calculate the total clicks? i am using Tomcat 7 as a server.
Is this possible in setting response header (302 or 404)?...
Please Guide me to get out of this issue?
Yes, you can use a 302: instead of providing the link to the other website, you provide a link to your own servlet, do your accounting and then send back a redirection (301/302) http status with the other web-site URL in the response Location header.
This maybe a bit simplistic though, since the user will leave your original page (is this what you want ?) and search engines may not like this if your web app is public.
I think right now you are redirecting the request(link for another website) at client side.In this approach your server cannot get the information about the click.
What you can do create a servlet and call this servlet on click now this servlet is responsible to redirect the request to another website. Add an static integer counter and increment this when servlet call each time.
Use the method setStatus():-
setStatus(HttpServletResponse.SC_FOUND);
or
setStatus(HttpServletResponse.SC_NOT_FOUND);
In my servlet i'm trying to response.sendRedirect() a request to another servlet (which is deployed via different .war). I understood that sendRedirect() makes a new request while forwarding, but looks like there is no mechanism to change new request's method type. Basically i'm trying to see if there is an option to choose Get or Post while calling sendRedirect.
Please suggest me if there is a way to change the request type or if not i'm trying to understand why it is not allowed.
response.sendRedirect is always a GET [also in broad term , redirect always GET s]. You can forward for your choice
See Also
java-servlet-difference-between-send-redirect-and-forward-in-servlets
URL Redirection
response.sendRedirect will always be a get as Jigar mentioned.
You can post to the target by having a hidden form with method post and submitting it with javascript when the page is loaded.