[ch06] 6.1 Implemented DispatcherServlet.

Signed-off-by: Dongho Sim <dhsim86@gmail.com>

src/main/java/Lesson06/DispatcherServlet.java

@@ -0,0 +1,94 @@
+package Lesson06;
+
+import Lesson05.Member;
+
+import javax.servlet.RequestDispatcher;
+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;
+
+/**
+ * Created by Dongho on 2017. 3. 25..
+ */
+@WebServlet("*.do")
+public class DispatcherServlet extends HttpServlet {
+
+    @Override
+    protected void service(
+        HttpServletRequest request, HttpServletResponse response
+    ) throws ServletException, IOException {
+
+        response.setContentType("text/html; charset=UTF-8");
+
+        String servletPath = request.getServletPath();
+
+        try {
+
+            String pageControllerPath = null;
+
+            if ("/member/list.do".equals(servletPath)) {
+                pageControllerPath = "/member/list";
+            }
+            else if ("/member/add.do".equals(servletPath)) {
+                pageControllerPath = "/member/add";
+
+                if (request.getParameter("email") != null) {
+                    request.setAttribute("member",
+                        new Member().setEmail(request.getParameter("email"))
+                                    .setNo(Integer.parseInt(request.getParameter("no")))
+                                    .setName(request.getParameter("name"))
+                    );
+                }
+            }
+            else if ("/member/update.do".equals(servletPath)) {
+                pageControllerPath = "/member/update";
+
+                if (request.getParameter("email") != null) {
+                    request.setAttribute("member",
+                            new Member().setEmail(request.getParameter("email"))
+                                    .setNo(Integer.parseInt(request.getParameter("no")))
+                                    .setName(request.getParameter("name"))
+                    );
+                }
+            }
+            else if ("/member/delete.do".equals(servletPath)) {
+                pageControllerPath = "/member/delete";
+            }
+            else if ("/auth/login.do".equals(servletPath)) {
+                pageControllerPath = "/auth/login";
+            }
+            else if ("/auth/logout.do".equals(servletPath)) {
+                pageControllerPath = "/auth/logout";
+            }
+
+            RequestDispatcher requestDispatcher =
+                request.getRequestDispatcher(pageControllerPath);
+
+            requestDispatcher.include(request, response);
+
+            String viewUrl = (String)request.getAttribute("viewUrl");
+
+            if (viewUrl.startsWith("redirect:")) {
+                response.sendRedirect(viewUrl.substring(9));
+                return;
+            }
+            else {
+                requestDispatcher = request.getRequestDispatcher(viewUrl);
+                requestDispatcher.include(request, response);
+            }
+        }
+        catch (Exception e) {
+
+            e.printStackTrace();
+            request.setAttribute("error", e);
+
+            RequestDispatcher requestDispatcher =
+                request.getRequestDispatcher("/Error.jsp");
+
+            requestDispatcher.forward(request, response);
+        }
+    }
+}