Java Reference
In-Depth Information
You'll start with the controller class. In Listing 14‐1, you have implemented a simple controller that
responds to any HTTP GET request made to the /users/* path. The mapping of this relationship is
dei ned in the web.xml i le:
< url‐pattern > /users/* < /url‐pattern >
In the listing, you map the controller class com.devchronicles.mvc.plain.FrontController to
the request URL /users/* . Therefore, for every request made to this URL, it is directed to the
FrontController class for processing.
Alternatively, you can annotate the controller class with the request URL like so:
@WebServlet({"/users/*"}). This annotation removes the need to dei ne the servlet
mapping in the web.xml .
The doGet() method is invoked for such requests, and an Action
object is retrieved from the
AbstractActionFactory , which determines the location of the view that should be returned to the user.
LISTING 14 ‐1: The refactored UserService class
package com.devchronicles.mvc.plain;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FrontController extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Action action =
AbstractActionFactory. getInstance ().getAction(request);
String view = action.execute(request, response);
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