[EDIT]controllerの修正

src/main/java/com/example/demo/app/presentation/controller/UserController.java

@@ -32,4 +32,18 @@ public class UserController {
 	    return "user_register_confirm";
 	}
 	
+	@PostMapping("/user/register/complete")
+	public String completeRegister(HttpSession session) {
+
+	    UserForm userForm =
+	            (UserForm) session.getAttribute("userForm");
+
+	    // DBへの登録処理
+
+	    session.removeAttribute("userForm");
+
+	    return "redirect:/login";
+	}
+
+
 }