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Implementing FrontController

Pragya Keshap answered on February 21, 2023 Popularity 1/10 Helpfulness 1/10

answer Implementing FrontController

Implementing FrontController

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import com.rhuan.action.Command.AbstractCommand;
import com.rhuan.action.Command.HomeCommand;
import com.rhuan.action.Command.LoginCommand;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "MyAppController", urlPatterns = "/myapp/*")
public class MyAppController extends HttpServlet {

private static Logger logger = 
    LogManager.getLogger(MyAppController.class);

    private final String PAGE_ERROR = "/pageError.jsp";

    protected void doPost(HttpServletRequest request, 
   HttpServletResponse response) throws ServletException, IOException {
        processRequest(request,response);
}

protected void doGet(HttpServletRequest request, 
   HttpServletResponse response) throws ServletException, IOException {
        processRequest(request,response);
}

protected void processRequest(HttpServletRequest
                                 request, HttpServletResponse response)
throws ServletException, java.io.IOException {
        String resultPage;
AbstractCommand command = null;
        try {

//Create a correspondent Command.
if(request.getSession().getAttribute("USER") == null)
                command = new LoginCommand();

            else command = new HomeCommand();

//Execute the Command that return a page.
resultPage = command.execute();
} catch (Exception e) {
logger.error(e.getMessage());
resultPage = PAGE_ERROR;
}

//Dispatch to correspondent page.
getServletContext().getRequestDispatcher(resultPage)
                           .forward(request, response);

}
}

https://www.baeldung.com/java-front-controller-pattern

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: front-controller java

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Contributed on Feb 21 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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