[Share Code] Bài tập quản lý sản phẩm sử dụng Session, JSTL, JavaBean trong lập trình JSP/Servlet

Bài tập quản lý sản phẩm sử dụng Session, JSTL, JavaBean trong lập trình JSP/Servlet

#add.jsp

Name: Học Lập Trình Từ A - Z (HTML/CSS/JS - Bootstrap/JQuery - AngularJS - PHP/Laravel - Java v.v)
Address: Số 8, Tôn Thất Thuyết, Mỹ Đình, Từ Liêm, Hà Nội, Nam Từ Liêm, Hà Nội, 100000
Telephone: 0967025996
Price range: $$$

<%-- 
    Document   : add
    Created on : Aug 17, 2020, 8:22:48 PM
    Author     : Diep
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
	<title>Add Product</title>
	<!-- Latest compiled and minified CSS -->
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"/>

	<!-- jQuery library -->
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

	<!-- Popper JS -->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>

	<!-- Latest compiled JavaScript -->
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
</head>
<body>
	<div class="container">
		<div class="panel panel-primary">
			<div class="panel-heading">
				<h2 class="text-center">Add Product</h2>
			</div>
			<div class="panel-body">
                            <form method="post">
				<div class="form-group">
				  <label for="usr">Name:</label>
                                  <input type="text" value="${index}" name="index" style="display: none;"/>
                                  <input required="true" value="${product.name}" type="text" class="form-control" id="name" name="name"/>
				</div>
				<div class="form-group">
				  <label for="email">Category:</label>
                                  <input required="true" value="${product.category}" type="text" class="form-control" id="category" name="category"/>
				</div>
				<div class="form-group">
				  <label for="price">Price:</label>
                                  <input type="number" value="${product.price}" class="form-control" id="price" name="price"/>
				</div>
				<div class="form-group">
				  <label for="description">Description:</label>
                                  <input type="text" value="${product.description}" class="form-control" id="description" name="description"/>
				</div>
				<button class="btn btn-success">Register</button>
                            </form>
			</div>
		</div>
	</div>
</body>
</html>

#list.jsp

<%-- 
    Document   : add
    Created on : Aug 17, 2020, 8:22:48 PM
    Author     : Diep
--%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
	<title>Add Product</title>
	<!-- Latest compiled and minified CSS -->
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"/>

	<!-- jQuery library -->
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

	<!-- Popper JS -->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>

	<!-- Latest compiled JavaScript -->
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
</head>
<body>
	<div class="container">
		<div class="panel panel-primary">
			<div class="panel-heading">
				<h2 class="text-center">List Product</h2>
			</div>
			<div class="panel-body">
                            <table class="table table-bordered">
                                <thead>
                                    <tr>
                                        <th>No</th>
                                        <th>Name</th>
                                        <th>Category</th>
                                        <th>Price</th>
                                        <th>Description</th>
                                        <th></th>
                                        <th></th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <c:forEach var="product" items="${productList}" varStatus="loop">
                                        <tr>
                                            <td>${loop.index + 1}</td>
                                            <td>${product.name}</td>
                                            <td>${product.category}</td>
                                            <td>${product.price}</td>
                                            <td>${product.description}</td>
                                            <td>
                                                <a href="add?id=${loop.index}">
                                                    <button class="btn btn-warning">Edit</button>
                                                </a>
                                            </td>
                                            <td>
                                                <form method="post">
                                                    <input name="index" value="${loop.index}" style="display: none"/>
                                                    <button class="btn btn-danger" name="action" value="delete">Delete</button>
                                                </form>
                                            </td>
                                        </tr>
                                    </c:forEach>
                                </tbody>
                            </table>
			</div>
		</div>
	</div>
</body>
</html>

#AddProductServlet.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package servlet;

import bean.Product;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Diep
 */
public class AddProductServlet extends HttpServlet {

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        int index = -1;
        if(request.getParameter("id") != null) {
            index = Integer.parseInt(request.getParameter("id"));
        }
        //save product into session
        HttpSession session = request.getSession(false);
        List<Product> productList = new ArrayList<>();

        if(session.getAttribute("productList") != null) {
            productList = (List<Product>) session.getAttribute("productList");
        }
        Product product = new Product();
        if(productList.size() > index && index != -1) {
            product = productList.get(index);
        } else {
            index = -1;
        }
        System.out.println(product);
        
        request.setAttribute("product", product);
        request.setAttribute("index", index);
        
        RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/product/add.jsp");
        dispatcher.forward(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String name = request.getParameter("name");
        String category = request.getParameter("category");
        float price = Float.parseFloat(request.getParameter("price"));
        String description = request.getParameter("description");
        int index = Integer.parseInt(request.getParameter("index"));
        
        Product product = new Product(name, category, description, price);
        //save product into session
        HttpSession session = request.getSession(false);
        List<Product> productList = new ArrayList<>();
        
        if(session.getAttribute("productList") != null) {
            productList = (List<Product>) session.getAttribute("productList");
        }
        if(index >= 0) {
            productList.set(index, product);
        } else {
            productList.add(product);
        }
        
        session.setAttribute("productList", productList);
        
        response.sendRedirect("add");
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

#ListProductServlet.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package servlet;

import bean.Product;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Diep
 */
public class ListProductServlet extends HttpServlet {

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/product/list.jsp");
        dispatcher.forward(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String action = request.getParameter("action");
        int index = Integer.parseInt(request.getParameter("index"));
        
        if(action.equalsIgnoreCase("delete")) {
            //save product into session
            HttpSession session = request.getSession(false);
            List<Product> productList = new ArrayList<>();

            if(session.getAttribute("productList") != null) {
                productList = (List<Product>) session.getAttribute("productList");
                productList.remove(index);
            }

            session.setAttribute("productList", productList);
        }

        response.sendRedirect("list");
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

#Product.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package bean;

import java.io.Serializable;

/**
 *
 * @author Diep
 */
public class Product implements Serializable{
    String name, category, description;
    float price;

    public Product() {
    }

    public Product(String name, String category, String description, float price) {
        this.name = name;
        this.category = category;
        this.description = description;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCategory() {
        return category;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Product{" + "name=" + name + ", category=" + category + ", description=" + description + ", price=" + price + '}';
    }
    
    
}

Phản hồi từ học viên

5

(Dựa trên đánh giá ngày hôm nay)