Question

I need from one JSP open another JSP, and send POST parameters to this JSP. I need to make same result as response.sendRedirect(url); but using this way I cant use POST request. Also note that I can’t use requestDispatcher because this JSP in another context. I think I need to use something like this:

    URL url = new URL("http://www.somesite.com");
    URLConnection conn = url.openConnection();
    ....
    writer.write(data);

But I’m not sure that I will open new page.

EDIT: @jaxb, yes, i tried it. But when I use it, I get only new page in existing page (i.e. I change page1 to page2, but not open new one with sending POST data to it).

Answer 1

I guess what you need is a way to construct a valid HTTP Post Request. When I had a similar problem I found a httpclient library shared at http://www.devx.com/Java/Article/17679/1954 to be quite useful and simple to use. It exposes simple methods for setting your post request and then calling a post method to do the actual post. Everything is quite well explained in the article and I would recommend you to give it a try.

At the end of this article the author (Vlad Patryshev) says:

Answer to the Eternal Question
Now you know how an HTML form (GET or POST) gets passed to the server as an HTTP request and how you can reproduce this behavior in your Java program—without overloading it with protocol details. You could say this solution answers the eternal question: How can one call a servlet or JSP from another servlet or JSP?

this I feel is quite similar to what you may be looking for.