Java web MVC - Admin-CRUD sản phẩm - Amzuni - Học lập trình trực tuyến

1. Phân tích chức năng

Xây dựng chức năng:

Hiển thị
Thêm
Sửa
Xoá

dữ liệu bảng sản phẩm (products)

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 IndexProductServlet kế thừa lớp BaseAdminServlet thực hiện chức năng quản lý trang hiển thị dữ liệu các sản phẩm

package binh.dev.admin.product;

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.Product;

/**
 *
 * @author binhdev
 */
public class IndexProductServlet extends BaseServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        List<Product> productList = DatabaseDao.getInstance().getProductDao().findAll();
        request.setAttribute("productList", productList);
        request.getRequestDispatcher("admin/product/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/products 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" %>
<%@ taglib prefix = "fmt" uri = "http://java.sun.com/jsp/jstl/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>SB Admin 2 - 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">PRODUCT</h1>
                    <p class="mb-4">Danh sách tất cả mặt hàng có trong bảng product</p>

                    <!-- DataTales Example -->
                    <div class="card shadow mb-4">
                        <div class="card-header py-3">
                            <h6 class="m-0 font-weight-bold text-primary">DataTables Example</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>Picture</th>
                                            <th>Name</th>
                                            <th>Description</th>
                                            <th>Price</th>
                                            <th>Quantity</th>
                                            <th>Category</th>
                                            <th>#</th>
                                            <th>#</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <c:set var="index" value="0"/>
                                        <c:forEach items="${productList}" var="product">
                                            <c:set var="index" value="${index + 1}"/>
                                            <tr>
                                                <td>${index}</td>
                                                <td>
                                                    <img src="${product.thumbnail}" width="50" height="50" alt="alt"/>
                                                </td>
                                                <td>${product.name}</td>
                                                <td>${product.description}</td>
                                                <td>
                                                    <fmt:setLocale value = "en_US"/>
                                                    <fmt:formatNumber type="currency" value = "${product.price}" /> 
                                                </td>
                                                <td>${product.quantity}</td>
                                                <td>${product.category.name}</td>
                                                <td>
                                                    <a href="EditProductServlet?productId=${product.id}">Edit</a>
                                                </td>
                                                <td>
                                                    <a href="DeleteProductServlet?productId=${product.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 CreateProductServlet kế thừa lớp BaseAdminServlet thực hiện chức năng quản lý trang hiển thị dữ liệu các sản phẩm

package binh.dev.admin.product;

import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.MultipartConfig;
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.Product;
import java.util.List;
import binh.dev.data.model.Category;
import binh.dev.data.model.Gallery;
import binh.dev.util.Constants;
import binh.dev.util.UploadFileHelper;

/**
 *
 * @author binhdev
 */
@MultipartConfig(
        fileSizeThreshold = 1024 * 1024 * 10, // 10 MB
        maxFileSize = 1024 * 1024 * 50, // 50 MB
        maxRequestSize = 1024 * 1024 * 100 // 100 MB
)
public class CreateProductServlet 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/product/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 description = request.getParameter("description");
        double price = Double.parseDouble(request.getParameter("price"));
        int quantity = 0;
        if(request.getParameter("quantity") == null)
        {
            session.setAttribute("errorMessage", "Vui lòng điền đầy đủ thông tin");
            request.getRequestDispatcher("admin/product/create.jsp").forward(request, response); 
           
        }else
        {
            quantity = Integer.parseInt(request.getParameter("quantity"));
        }
        int categoryId = Integer.parseInt(request.getParameter("categoryId"));
        Product product = new Product(name, description, price, quantity, categoryId);

        if (name.isEmpty() || description.isEmpty() ) {
            session.setAttribute("errorMessage", "Vui lòng điền đầy đủ thông tin");
            request.getRequestDispatcher("admin/product/edit.jsp").forward(request, response);
        }

        int productId = DatabaseDao.getInstance().getProductDao().insert(product);

        createGallery(productId, request);

        response.sendRedirect("IndexProductServlet");

    }

    private void createGallery(int productId, HttpServletRequest request) {
        List<String> photos = UploadFileHelper.uploadFile(Constants.UPLOAD_DIR, request);
        for (int i = 0; i < photos.size(); i++) {
            Gallery g = new Gallery(Constants.UPLOAD_DIR + "/" + photos.get(i), productId);
            DatabaseDao.getInstance().getGalleryDao().insert(g);
        }
    }
}

B2: Tạo tập tin create.jsp trong thư mục web/admin/products 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="CreateProductServlet" method="post" enctype="multipart/form-data">
                        <div class="form-group">
                            <label for="exampleInputEmail1">Picture</label>
                            <input type="file" name="photos" multiple="multiple" />
                        </div>
                        <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">Description</label>
                            <input type="text" name="description" class="form-control" placeholder="Enter Description">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Category</label>
                            <select name="categoryId" class="form-control">
                                <c:forEach items="${categoryList}" var="category">
                                    <option value="${category.id}">${category.name}</option>
                                </c:forEach>
                            </select>
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Price</label>
                            <input type="number" name="price" class="form-control" placeholder="Enter Price">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Quantity</label>
                            <input type="number" name="quantity" class="form-control" placeholder="Enter Quantity">
                        </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 EditProductServlet kế thừa lớp BaseAdminServlet thực hiện chức năng cập nhật sản phẩm

package binh.dev.admin.product;

import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.MultipartConfig;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import java.util.List;
import binh.dev.BaseServlet;
import binh.dev.data.dao.Database;
import binh.dev.data.dao.DatabaseDao;
import binh.dev.data.dao.GalleryDao;
import binh.dev.data.dao.ProductDao;
import binh.dev.data.model.Category;
import binh.dev.data.model.Gallery;
import binh.dev.data.model.Product;
import binh.dev.util.Constants;
import binh.dev.util.UploadFileHelper;

/**
 *
 * @author binhdev
 */
@MultipartConfig(
        fileSizeThreshold = 1024 * 1024 * 10, // 10 MB
        maxFileSize = 1024 * 1024 * 50, // 50 MB
        maxRequestSize = 1024 * 1024 * 100 // 100 MB
)
public class EditProductServlet extends BaseServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HttpSession session = request.getSession();
        int productId = Integer.parseInt(request.getParameter("productId"));
        Product product = DatabaseDao.getInstance().getProductDao().find(productId);
        List<Category> categoryList = DatabaseDao.getInstance().getCategoryDao().findAll();
        session.setAttribute("product", product);
        session.setAttribute("categoryList", categoryList);
        request.getRequestDispatcher("admin/product/edit.jsp").include(request, response);
    }

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

        int productId = Integer.parseInt(request.getParameter("productId"));
        Product product = productDao.find(productId);

        String name = request.getParameter("name");
        String description = request.getParameter("description");
        double price = Double.parseDouble(request.getParameter("price"));
        int quantity = Integer.parseInt(request.getParameter("quantity"));
        int categoryId = Integer.parseInt(request.getParameter("categoryId"));
        product.setName(name);
        product.setDescription(description);
        product.setPrice(price);
        product.setQuantity(quantity);
        product.setCategoryId(categoryId);

//        if (name.isEmpty() || description.isEmpty() ) {
//            session.setAttribute("errorMessage", "Vui lòng điền đầy đủ thông tin");
//            request.getRequestDispatcher("admin/product/edit.jsp").forward(request, response);
//        }

        productDao.update(product);

        updateGallery(product.getId(), request);

        response.sendRedirect("IndexProductServlet");
    }

    private void updateGallery(int productId, HttpServletRequest request) {
        GalleryDao galleryDao = DatabaseDao.getInstance().getGalleryDao();
        galleryDao.deleteByProduct(productId);

        List<String> photos = UploadFileHelper.uploadFile(Constants.UPLOAD_DIR, request);
        for (int i = 0; i < photos.size(); i++) {
            Gallery g = new Gallery(Constants.UPLOAD_DIR + "/" + photos.get(i), productId);
            galleryDao.insert(g);
        }
    }

}

B2: Tạo tập tin update.jsp trong thư mục web/admin/products 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="EditProductServlet" method="post" enctype="multipart/form-data">
                        <input type="hidden" name="productId" value="${product.id}">
                        <div class="form-group">
                            <div class="row">
                                <c:forEach items="${product.galleries}" var="photo">
                                    <div class="col-md-3">
                                        <img class="p-thumbnail" src="${photo.url}" alt="alt"/>
                                    </div>
                                </c:forEach>
                            </div>
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Picture</label>
                            <input type="file" name="photos" multiple="multiple" />
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Name</label>
                            <input type="text" name="name" class="form-control" placeholder="Enter name" value="${product.name}">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Description</label>
                            <input type="text" name="description" class="form-control" placeholder="Enter Description" value="${product.description}">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Category</label>
                            <select name="categoryId" class="form-control">
                                <c:forEach items="${categoryList}" var="cat">
                                    <option <c:if test="${cat.id == category.id}">selected</c:if>  value="${cat.id}">${cat.name}</option>
                                </c:forEach>
                            </select>
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Price</label>
                            <input type="number" name="price" min="0" class="form-control" placeholder="Enter Price" value="${product.price}">
                        </div>
                        <div class="form-group">
                            <label for="exampleInputEmail1">Quantity</label>
                            <input type="number" name="quantity" class="form-control" placeholder="Enter Quantity" value="${product.quantity}">
                        </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 DeleteProductServlet kế thừa lớp BaseAdminServlet thực hiện chức năng xoá sản phẩm

package loi.dev.admin.product;

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 DeleteProductServlet extends BaseServlet {

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

    }

    @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

Java web MVC – Admin-CRUD sản phẩm

1. Phân tích chức năng

2. Thực thi

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