Java web MVC - Admin-CRUD người dùng - Amzuni - Học lập trình trực tuyến

1. Phân tích chức năng

Xây dựng chức năng:

Hiển thị
Thêm
Sửa
Xoá

dữ liệu bảng danh mục (users)

2. Thực thi

Đối với mối chức năng chúng ta sẽ có 1 controller riêng để đảm nhiệm

2.1. Chức năng hiển thị

B1: Tạo controller IndexUserServlet kế thừa lớp BaseAdminServlet thực hiện chức năng quản lý trang hiển thị dữ liệu các người dùng

package binh.dev.admin.user;

import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.util.List;
import binh.dev.BaseServlet;
import binh.dev.data.dao.DatabaseDao;
import binh.dev.data.model.User;

/**
 *
 * @author binhdev
 */
public class IndexUserServlet extends BaseServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       List<User> userList = DatabaseDao.getInstance().getUserDao().findAll();
       request.setAttribute("userList", userList);
       request.getRequestDispatcher("admin/user/index.jsp").include(request, response);
    }

  
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
    }
}

B2: Tạo giao diện index.jsp trong thư mục web/admin/users làm chức năng view

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<!DOCTYPE html>
<html lang="en">

     <head>

        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <meta name="description" content="">
        <meta name="author" content="">

        <title>CornSalad Admin - Dashboard</title>

        <!-- Custom fonts for this template-->
        <link href="./assets/admin/vendor/fontawesome-free/css/all.min.css" rel="stylesheet" type="text/css">
        <link
            href="https://fonts.googleapis.com/css?family=Nunito:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i"
            rel="stylesheet">

        <!-- Custom styles for this template-->
        <link href="./assets/admin/css/sb-admin-2.min.css" rel="stylesheet">
    </head>

    <body id="page-top">

        <!-- Page Wrapper -->
        <div id="wrapper">

            <!-- Sidebar -->
            <%@include file="../inc/sidebar.jsp" %>
            <!-- End of Sidebar -->

            <!-- Content Wrapper -->
            <div id="content-wrapper" class="d-flex flex-column">
                <%@include file="../inc/header.jsp" %>
                <!-- Main Content -->
                <!-- Begin Page Content -->
                <div class="container-fluid">

                    <!-- Page Heading -->
                    <h1 class="h3 mb-2 text-gray-800">Users</h1>
                    <p class="mb-4">Danh sách các user đã đăng ký trong CornSalad Store .</p>

                    <!-- DataTales Example -->
                    <div class="card shadow mb-4">
                        <div class="card-header py-3">
                            <h6 class="m-0 font-weight-bold text-primary">Users Table</h6>
                        </div>
                        <div class="card-body">

                            <div class="table-responsive">
                                <table class="table table-bordered" id="dataTable" width="100%" cellspacing="0">
                                    <thead>
                                        <tr>
                                            <th>STT</th>
                                            <th>Email</th>
                                            <th>Pass</th>
                                            <th>Role</th>
                                            <th>#</th>
                                            <th>#</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <c:set var="index" value="0"/>
                                        <c:forEach items="${userList}" var="user">
                                            <c:set var="index" value="${index + 1}"/>
                                            <tr>
                                                <td>${index}</td>
                                                <td>${user.email} </td>
                                                <td>${user.password}</td>
                                                <td>${user.role}</td>
                                                <td>
                                                    <a href="EditUserServlet?userId=${user.id}">Edit</a>
                                                </td>
                                                <td>
                                                    <a href="DeleteUserServlet?userId=${user.id}">Delete</a>
                                                </td>
                                            </tr>
                                        </c:forEach>
                                    </tbody>
                                </table>
                            </div>

                        </div>
                    </div>

                </div>
                <!-- /.container-fluid -->
                <!-- End of Main Content -->

                <!-- Footer -->
                <%@include file="../inc/footer.jsp" %>
                <!-- End of Footer -->

            </div>
            <!-- End of Content Wrapper -->

        </div>
        <!-- End of Page Wrapper -->

        <!-- Scroll to Top Button-->
        <a class="scroll-to-top rounded" href="#page-top">
            <i class="fas fa-angle-up"></i>
        </a>



        <!-- Bootstrap core JavaScript-->
        <script src="./assets/admin/vendor/jquery/jquery.min.js"></script>
        <script src="./assets/admin/vendor/bootstrap/js/bootstrap.bundle.min.js"></script>

        <!-- Core plugin JavaScript-->
        <script src="./assets/admin/vendor/jquery-easing/jquery.easing.min.js"></script>

        <!-- Custom scripts for all pages-->
        <script src="./assets/admin/js/sb-admin-2.min.js"></script>

        <!-- Page level plugins -->
        <script src="./assets/admin/vendor/chart.js/Chart.min.js"></script>

        <!-- Page level custom scripts -->
        <script src="./assets/admin/js/demo/chart-area-demo.js"></script>
        <script src="./assets/admin/js/demo/chart-pie-demo.js"></script>

    </body>

</html>

B1: Tạo controller CreateUserServlet kế thừa lớp BaseAdminServlet thực hiện chức năng quản lý trang hiển thị dữ liệu các người dùng

package binh.dev.admin.user;

import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import binh.dev.BaseServlet;
import binh.dev.data.dao.DatabaseDao;
import binh.dev.data.dao.UserDAO;
import binh.dev.data.model.User;

/**
 *
 * @author binhdev
 */
public class CreateUserServlet extends BaseServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.getRequestDispatcher("admin/user/create.jsp").include(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        String repeatPass = request.getParameter("repeatPass");
        String role = request.getParameter("role");
        UserDAO userDao = DatabaseDao.getInstance().getUserDao();
        User user = userDao.find(email);
        HttpSession session = request.getSession();
        //        Kiểm tra thông tin đăng ký 
        // Xử lý lỗi khi nhập thông tin thiếu
        if (email.isEmpty() || password.isEmpty() || repeatPass.isEmpty() || role.isEmpty()) {

            session.setAttribute("errorMessage", "Vui lòng điền đầy đủ thông tin đăng ký");
            request.getRequestDispatcher("admin/user/create.jsp").forward(request, response);
            // Xử lý lỗi khi emai trùng
        } else if (user != null) {
            session.setAttribute("errorMessage", "Email trùng");
            request.getRequestDispatcher("admin/user/create.jsp").forward(request, response);
            // Xử lý lỗi khi mật khẩu nhập lại không đúng
        } else if (!password.equals(repeatPass)) {
            session.setAttribute("errorMessage", "Mật khẩu nhập lại không trùng");
            request.getRequestDispatcher("admin/user/create.jsp").forward(request, response);
        } else {
            // Xử lý thông tin đăng ký hợp lệ
            user = new User(email, password, role);
            userDao.insert(user);
            response.sendRedirect("IndexUserServlet");
        }
    }

}

B2: Tạo tập tin create.jsp trong thư mục web/admin/users làm chức năng view

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<!DOCTYPE html>
<html lang="en">

    <head>

        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <meta name="description" content="">
        <meta name="author" content="">

        <title>CornSalad Admin - Dashboard</title>

        <!-- Custom fonts for this template-->
        <link href="./assets/admin/vendor/fontawesome-free/css/all.min.css" rel="stylesheet" type="text/css">
        <link
            href="https://fonts.googleapis.com/css?family=Nunito:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i"
            rel="stylesheet">

        <!-- Custom styles for this template-->
        <link href="./assets/admin/css/sb-admin-2.min.css" rel="stylesheet">
        <link href="./assets/admin/css/style.css" rel="stylesheet">
    </head>

    <body id="page-top">

        <!-- Page Wrapper -->
        <div id="wrapper">

            <!-- Sidebar -->
            <%@include file="../inc/sidebar.jsp" %>
            <!-- End of Sidebar -->

            <!-- Content Wrapper -->
            <div id="content-wrapper" class="d-flex flex-column">
                <!-- Topbar -->
                <%@include file="../inc/header.jsp" %>
                <!-- End of Topbar -->
                <!-- Main Content -->
                <div class="container-fluid">
                    <form action="CreateUserServlet" method="post">
                        <div class="form-group">
                            <label for="exampleInputEmail1">Name</label>
                            <input type="email" name="email" class="form-control" placeholder="Enter Email">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Password</label>
                            <input type="text" name="password" class="form-control" placeholder="Enter password">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Repeat Password</label>
                            <input type="text" name="repeatPass" class="form-control" placeholder="Enter Repeat Password">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1" >Role:</label>
                            <select name="role" class="form-sub-select">
                                <option value="User">User </option>
                                <option value="Admin">Admin </option>
                            </select>
                            <div class="form-text text-muted" >
                                ${errorMessage}
                                <c:remove var="errorMessage" scope="session" />
                            </div>
                        </div>

                        <button type="submit" class="btn btn-primary">Submit</button>
                    </form>
                </div>
                <!-- End of Main Content -->

                <!-- Footer -->
                <%@include file="../inc/footer.jsp" %>
                <!-- End of Footer -->

            </div>
            <!-- End of Content Wrapper -->

        </div>
        <!-- End of Page Wrapper -->

        <!-- Scroll to Top Button-->
        <a class="scroll-to-top rounded" href="#page-top">
            <i class="fas fa-angle-up"></i>
        </a>



        <!-- Bootstrap core JavaScript-->
        <script src="./assets/admin/vendor/jquery/jquery.min.js"></script>
        <script src="./assets/admin/vendor/bootstrap/js/bootstrap.bundle.min.js"></script>

        <!-- Core plugin JavaScript-->
        <script src="./assets/admin/vendor/jquery-easing/jquery.easing.min.js"></script>

        <!-- Custom scripts for all pages-->
        <script src="./assets/admin/js/sb-admin-2.min.js"></script>

        <!-- Page level plugins -->
        <script src="./assets/admin/vendor/chart.js/Chart.min.js"></script>

        <!-- Page level custom scripts -->
        <script src="./assets/admin/js/demo/chart-area-demo.js"></script>
        <script src="./assets/admin/js/demo/chart-pie-demo.js"></script>

    </body>

</html>

2.3. Chức năng cập nhật

B1: Tạo controller EditUserServlet kế thừa lớp BaseAdminServlet thực hiện chức năng cập nhật người dùng

package binh.dev.admin.user;

import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import binh.dev.BaseServlet;
import binh.dev.data.dao.DatabaseDao;
import binh.dev.data.dao.UserDAO;
import binh.dev.data.model.User;

/**
 *
 * @author binhdev
 */
public class EditUserServlet extends BaseServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HttpSession session = request.getSession();
        int userId = Integer.parseInt(request.getParameter("userId"));
        User user1 = DatabaseDao.getInstance().getUserDao().find(userId);
        session.setAttribute("user1", user1);
        request.getRequestDispatcher("admin/user/edit.jsp").include(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        UserDAO userDao = DatabaseDao.getInstance().getUserDao();
        HttpSession session = request.getSession();
        int userId = Integer.parseInt(request.getParameter("userId"));
        User user = userDao.find(userId);
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        String role = request.getParameter("role");

//        user.setEmail(email);
        user.setPassword(password);
        user.setRole(role);
        if (email.isEmpty() || password.isEmpty() || role.isEmpty()) {
            session.setAttribute("errorMessage", "Vui lòng điền đầy đủ thông tin");
            request.getRequestDispatcher("admin/user/edit.jsp").forward(request, response);
            // Xử lý lỗi khi thay đổi email
        } else if (!email.equals(user.getEmail())) {
            session.setAttribute("errorMessage", "Không được thay đổi Email");
            request.getRequestDispatcher("admin/user/edit.jsp").forward(request, response);

        } else {
            userDao.update(user);
            response.sendRedirect("IndexUserServlet");
        }

    }

}

B2: Tạo tập tin update.jsp trong thư mục web/admin/users làm chức năng view

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<!DOCTYPE html>
<html lang="en">

     <head>

        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <meta name="description" content="">
        <meta name="author" content="">

        <title>CornSalad Admin - Dashboard</title>

        <!-- Custom fonts for this template-->
        <link href="./assets/admin/vendor/fontawesome-free/css/all.min.css" rel="stylesheet" type="text/css">
        <link
            href="https://fonts.googleapis.com/css?family=Nunito:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i"
            rel="stylesheet">

        <!-- Custom styles for this template-->
        <link href="./assets/admin/css/sb-admin-2.min.css" rel="stylesheet">
        <link href="./assets/admin/css/style.css" rel="stylesheet">
    </head>

    <body id="page-top">

        <!-- Page Wrapper -->
        <div id="wrapper">

            <!-- Sidebar -->
            <%@include file="../inc/sidebar.jsp" %>
            <!-- End of Sidebar -->

            <!-- Content Wrapper -->
            <div id="content-wrapper" class="d-flex flex-column">
                <!-- Topbar -->
                <%@include file="../inc/header.jsp" %>
                <!-- End of Topbar -->
                <!-- Main Content -->
                <div class="container-fluid">
                    <form action="EditUserServlet?userId=${user1.id}" method="post">
                        <input type="hidden" name="userId" value="${user1.id}">
                        <div class="form-group">
                            <label for="exampleInputEmail1">Email</label>
                            <input type="email" name="email" class="form-control" placeholder="Enter Email" value="${user1.email}" >
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Password</label>
                            <input type="text" name="password" class="form-control" placeholder="Enter Password" value="${user1.password}">

                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Role</label>
                            <select name="role" class="form-control">
                                <option value="User">${user1.role} </option>
                                <option value="user">User </option>
                                <option value="admin">Admin </option>
                            </select>
                        </div>
                        <div class="form-text text-muted" >
                            ${errorMessage}
                            <c:remove var="errorMessage" scope="session" />
                        </div>

                        <button type="submit" class="btn btn-primary">Submit</button>
                    </form>
                </div>
                <!-- End of Main Content -->

                <!-- Footer -->
                <%@include file="../inc/footer.jsp" %>
                <!-- End of Footer -->

            </div>
            <!-- End of Content Wrapper -->

        </div>
        <!-- End of Page Wrapper -->

        <!-- Scroll to Top Button-->
        <a class="scroll-to-top rounded" href="#page-top">
            <i class="fas fa-angle-up"></i>
        </a>



        <!-- Bootstrap core JavaScript-->
        <script src="./assets/admin/vendor/jquery/jquery.min.js"></script>
        <script src="./assets/admin/vendor/bootstrap/js/bootstrap.bundle.min.js"></script>

        <!-- Core plugin JavaScript-->
        <script src="./assets/admin/vendor/jquery-easing/jquery.easing.min.js"></script>

        <!-- Custom scripts for all pages-->
        <script src="./assets/admin/js/sb-admin-2.min.js"></script>

        <!-- Page level plugins -->
        <script src="./assets/admin/vendor/chart.js/Chart.min.js"></script>

        <!-- Page level custom scripts -->
        <script src="./assets/admin/js/demo/chart-area-demo.js"></script>
        <script src="./assets/admin/js/demo/chart-pie-demo.js"></script>

    </body>

</html>

2.3. Chức năng xoá

B1: Tạo controller DeleteUserServlet kế thừa lớp BaseAdminServlet thực hiện chức năng xoá người dùng

package binh.dev.admin.user;

import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import binh.dev.BaseServlet;
import binh.dev.data.dao.DatabaseDao;

/**
 *
 * @author binhdev
 */
public class DeleteUserServlet extends BaseServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         int userId = Integer.parseInt(request.getParameter("userId"));
        DatabaseDao.getInstance().getUserDao().delete(userId);
        
        response.sendRedirect("IndexUserServlet");
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       
    }
}

B2: Với chức năng xoá thì chúng ta không cần giao diện chỉ sử lý việc xoá dữ liệu xong chuyển hướng trang lại trang index trong method doGet

response.sendRedirect("IndexUserServlet");

Java web MVC – Admin-CRUD người dùng

1. Phân tích chức năng

2. Thực thi

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