Java web MVC - Admin-CRUD danh mục - 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 (categories)

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 IndexCategoryServlet kế thừa lớp BaseAdminServlet thực hiện chức năng quản lý trang hiển thị dữ liệu các danh mục

package binh.dev.admin.category;

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.Category;

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

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        List<Category> categoryList = DatabaseDao.getInstance().getCategoryDao().findAll();
        request.setAttribute("categoryList", categoryList);
        request.getRequestDispatcher("admin/category/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/categories làm chức năng view

<%-- 
    Document   : dashboard
    Created on : May 23, 2023, 6:10:20 PM
    Author     : binhdev
--%>

<%@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">

                <!-- Main Content -->
                 <!-- Topbar -->
                    <%@include file="../inc/header.jsp" %>
                    <!-- End of Topbar -->
                <!-- Begin Page Content -->
                <div class="container-fluid">

                    <!-- Page Heading -->
                    <h1 class="h3 mb-2 text-gray-800">Categories</h1>
                    <p class="mb-4">Danh sách các Loaị hàng cùng thuộc tính kèm theo 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">Category 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>Thumbnail</th>
                                            <th>Name</th>
                                            <th>#</th>
                                            <th>#</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <c:set var="index" value="0"/>
                                        <c:forEach items="${categoryList}" var="category">
                                        <c:set var="index" value="${index + 1}"/>
                                            <tr>
                                                <td>${index}</td>
                                                <td>
                                                    <img src="${category.thumbnail}" width="50" height="50" alt="alt"/>
                                                </td>
                                                <td>${category.name}</td>
                                                <td>
                                                    <a href="EditCategoryServlet?categoryId=${category.id}">Edit</a>
                                                </td>
                                                <td>
                                                    <a href="DeleteCategoryServlet?categoryId=${category.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>

2.2. Chức năng thêm mới

B1: Tạo controller CreateCategoryServlet kế thừa lớp BaseAdminServlet thực hiện chức năng quản lý trang hiển thị dữ liệu các danh mục

package binh.dev.admin.category;

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.model.Category;

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

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

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HttpSession session = request.getSession();

        String name = request.getParameter("name");
        String thumbnail = request.getParameter("thumbnail");

        if (name.isEmpty() || thumbnail.isEmpty()) {

            session.setAttribute("errorMessage", "Vui lòng điền đầy đủ thông tin đăng ký");
            request.getRequestDispatcher("admin/category/create.jsp").forward(request, response);
        } else {
            Category category = new Category(name, thumbnail);
            DatabaseDao.getInstance().getCategoryDao().insert(category);

            response.sendRedirect("IndexCategoryServlet");
        }

    }

}

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

<%-- 
    Document   : dashboard
    Created on : May 23, 2023, 6:10:20 PM
    Author     : binhdev
--%>

<%@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 t    his 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">
                    <h1 class="h3 mb-2 text-gray-800">Create Category</h1>
                    <form action="CreateCategoryServlet" method="post">
                        <div class="form-group">
                            <label for="exampleInputEmail1">Name</label>
                            <input type="text" name="name" class="form-control" placeholder="Enter name">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Picture</label>
                            <input type="text" name="thumbnail" class="form-control" placeholder="Enter link thumbnail">
                        </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 cập nhật

B1: Tạo controller EditCategoryServlet kế thừa lớp BaseAdminServlet thực hiện chức năng cập nhật danh mục

package binh.dev.admin.category;

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.CategoryDao;
import binh.dev.data.dao.DatabaseDao;
import binh.dev.data.model.Category;

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

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         HttpSession session = request.getSession();
        int categoryId = Integer.parseInt(request.getParameter("categoryId"));
        Category category = DatabaseDao.getInstance().getCategoryDao().find(categoryId);

        session.setAttribute("category", category);
        request.getRequestDispatcher("admin/category/edit.jsp").include(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        CategoryDao categoryDao = DatabaseDao.getInstance().getCategoryDao();
        HttpSession session = request.getSession();

        int categoryId = Integer.parseInt(request.getParameter("categoryId"));
        Category category = categoryDao.find(categoryId);

        String name = request.getParameter("name");
        String thumbnail = request.getParameter("thumbnail");

        category.setName(name);
        category.setThumbnail(thumbnail);
        if (name.isEmpty() || thumbnail.isEmpty()) {
            session.setAttribute("errorMessage", "Vui lòng điền đầy đủ thông tin");
            request.getRequestDispatcher("admin/category/edit.jsp").forward(request, response);
        } else {
            categoryDao.update(category);

            response.sendRedirect("IndexCategoryServlet");
        }

    }

}

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

<%-- 
    Document   : dashboard
    Created on : May 23, 2023, 6:10:20 PM
    Author     : binhdev
--%>

<%@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="EditCategoryServlet" method="post">
                        <input type="hidden" name="categoryId" value="${category.id}">
                        <div class="form-group">
                            <label for="exampleInputEmail1">Name</label>
                            <input type="text" name="name" class="form-control" placeholder="Enter name" value="${category.name}">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Name</label>
                            <input type="text" name="thumbnail" class="form-control" placeholder="Enter link thumbnail" value="${category.thumbnail}">
                        </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 DeleteCategoryServlet kế thừa lớp BaseAdminServlet thực hiện chức năng xoá danh mục

package binh.dev.admin.category;

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 DeleteCategoryServlet extends BaseServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        int categoryId = Integer.parseInt(request.getParameter("categoryId"));
        DatabaseDao.getInstance().getCategoryDao().delete(categoryId);
        
        response.sendRedirect("IndexCategoryServlet");
    }

    @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("IndexCategoryServlet");

Java web MVC – Admin-CRUD danh mục

1. Phân tích chức năng

2. Thực thi

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