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Editorial Team
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Asked: 2026-05-18T09:35:32+00:00

I have tried a program where if username matches password, welcome message should be

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I have tried a program where if username matches password, welcome message should be displayed in someother page. If it doesn,t match error should be in the same page. I have tried this 

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class WelcomeUser extends HttpServlet {
    public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
        String name=request.getParameter("name");
        String pwd=request.getParameter("pwd");
        response.setContentType("text/html");
        PrintWriter out=response.getWriter();

        if (!(name.equals(pwd))) {
            out.println("Invalid");
            request.getRequestDispatcher("login.html").forward(request,response);
        } else {
            out.println("<html>");
            out.println("<body>");
            out.println("Welcome"+name);
            out.println("</html>");
            out.println("</body>");
        }
    }
}

What change should I make to print invalid user in the same page? It compiles fine but I am not getting invalid in the login page

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1 Answer

  1. Editorial Team

    Don’t ever use out.print for HTML in a servlet. There the JSP is for. Set it as request attribute and just let JSP display it with help of EL.

    request.setAttribute("message", "Invalid"); // Will be available as ${message}
request.getRequestDispatcher("login.jsp").forward(request,response);

    Rename login.html to login.jsp and add the following somewhere next to the submit button.

    ${message}

    See also:

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