Servlet -print invalid password in the same page
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开发者_如何学C.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
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:
- Servlets tag info page - contains hello world example and several useful links.
加载中,请稍侯......
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