Filter to process form data
Hello,
I am implementing MVC model for my Web project. In which i pass the values of a login web page to a servlet.
I want to implement filter which checks if user name and password are entered.
I am not sure how to call the filter from a Web page. I tied to do same was as calling a servlet but Tomcat gives exception.
my filter is
package controller;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import communication.ServerComm;
publicclass InitialFilterimplements Filter{
private ServerComm server;
private FilterConfig config =null;
publicvoid init(FilterConfig config)throws ServletException{
this.config = config;
}
publicvoid destroy(){
config =null;
}
publicvoid doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)throws IOException, ServletException{
//casting request response objects
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
String username = (String)request.getParameter("Username").trim();
String password = (String)request.getParameter("Password").trim();
//checks if username and password are entered.
if(username.equals("")||password.equals("")){
res.sendRedirect(req.getContextPath()+"/relogin.html");
return;
}
server =new ServerComm(username);
req.setAttribute("initserver", server);
res.sendRedirect(req.getContextPath()+"/LoginHandler");
}
}
Thanks in advance
