Issue
I wondered if it is possible to send HTML page using both Servlet and JSP. And no, I don't want JSP to do all work by forwarding the request from Servlet. I want Servlet to write "hello" and JSP to write "user's name".
index.html:
<html><body>
<form action="MyServlet" method="POST">
Enter name: <input type="text" name="name">
<button>Submit name</button>
</form>
</body></html>
MyServlet.java:
@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PrintWriter pw = resp.getWriter();
pw.println("hello ");
RequestDispatcher dispatch = req.getRequestDispatcher("test.jsp");
dispatch.forward(req, resp);
}
}
test.jsp:
<html><body>
<%= request.getParameter("name") %>
</body></html>
After filling my form:
, I expected to get hello elephant. But I only get elephant. I tried to put pw.flush() inside servlet's code which gave an opposite result - just hello.
Now I am stuck, as I don't understand what is wrong. I guess when I flushed a stream, response was committed, so rest of code didn't run. But why user didn't get hello message when I didn't commit (flush) a stream? Can I even do such a thing as I described? Looks like I am missing some elementary things here.
Solution
Use RequestDispatcher.include(ServletRequest, ServletResponse) instead of forward. Change
dispatch.forward(req, resp);
to
dispatch.include(req, resp);
Answered By - Elliott Frisch
Answer Checked By - Mary Flores (JavaFixing Volunteer)
