新网网站负责人核验现场拍摄照片电子件湖北洲天建设集团有限公司网站
1.题目要求
利用servlet实现对书籍书名、单价、数量等信息的添加，计算总价。
要求：输入两次表单信息，在一个成功返回的页面里面显示两次的数据。
2.Book实体类
package com.hjj.sevletgk.hw7.book;/*** @author:嘉佳 Date:2023/10/8 15:16**/public class Book {private double price;private int num;private String bookName;private double totalPrice;public Book(){}public Book(double price, int num, String bookName) {this.price = price;this.num = num;this.bookName = bookName;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public int getNum() {return num;}public void setNum(int num) {this.num = num;}public String getBookName() {return bookName;}public void setBookName(String bookName) {this.bookName = bookName;}public double getTotalPrice() {return this.price*this.num;}public void setTotalPrice(double totalPrice) {this.totalPrice = totalPrice;}}
3.sevlet
package com.hjj.sevletgk.hw7.booksevlet;import com.hjj.sevletgk.hw7.book.Book;import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;@WebServlet("/book")
public class BookServlet extends HttpServlet {private List<Book> bookList=new ArrayList<>();@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String bookName=req.getParameter("bookName");double price = Double.parseDouble(req.getParameter("price"));int num = Integer.parseInt(req.getParameter("num"));// 把录入的信息添加到列表中Book book = new Book(price,num,bookName);bookList.add(book);// 计算总价int totalNum=0;double totalPrice = 0;for (Book b : bookList) {totalNum += b.getNum();totalPrice += b.getTotalPrice();}req.setAttribute("bookList", bookList);req.setAttribute("totalPrice", totalPrice);req.setAttribute("totalNum", totalNum);// 转发到结果页面RequestDispatcher dispatcher = req.getRequestDispatcher("hw7/result.jsp");dispatcher.forward(req, resp);}
}
4.jsp
(1) order.jsp
<%--Created by IntelliJ IDEA.User: ALASIJIADate: 2023/10/8Time: 15:11To change this template use File | Settings | File Templates.
--%>
<%@page contentType="text/html;charset=UTF-8"%>
<%@page pageEncoding="UTF-8"%>
<html>
<head><meta charset="UTF-8"><title>信息录入</title>
</head>
<body>
<h2>请输入购书信息</h2>
<form method="post" action="${pageContext.request.contextPath}/book" ><label for="bookName">书名</label><input type="text" name="bookName" id="bookName" required><br/><label for="price">单价</label><input type="text" name="price" id="price" required><br/><label for="num">数量</label><input type="text" name="num" id="num" required><br/><input type="submit" value="提交"/>
</form>
</body>
</html>
(2) result.jsp
<%--Created by IntelliJ IDEA.User: ALASIJIADate: 2023/10/8Time: 15:09To change this template use File | Settings | File Templates.
--%>
<%@page contentType="text/html;charset=UTF-8" %>
<%@page pageEncoding="UTF-8" %>
<%@page import="com.hjj.sevletgk.hw7.book.Book" %>
<%@ page import="java.util.List" %>
<html>
<head><title>信息查看</title><meta charset="UTF-8"><style>h2 {text-align: center;}table {/* 合并边框 */border-collapse: collapse;height: 80px;/* 居中 */margin: 0 auto;}th {/* 内边距 */padding: 5px 20px;}table, th, td {border: 1px solid #000;}</style>
</head>
<body>
<%--
id：指定实例化的 JavaBean 对象的名称
class：指定要实例化的 JavaBean 对象的类的全类名
--%>
<jsp:useBean id="Book" class="com.hjj.sevletgk.hw7.book.Book"/>
<jsp:setProperty name="Book" property="*"/>
<h2>商品总价</h2>
<%request.setCharacterEncoding("UTF-8");
%><table><tr><th>书名</th><th>价格</th><th>数量</th><th>总价</th></tr><% for (Book book : (List<Book>) request.getAttribute("bookList")) { %><tr><td><%= book.getBookName() %></td><td><%= book.getPrice() %></td><td><%= book.getNum() %></td><td><%= book.getTotalPrice() %></td></tr><% } %><tr><%-- 该单元格要横跨 2 列--%><td colspan="2"><b>总计:</b></td><td><b>商品总数:</b><%= request.getAttribute("totalNum") %></td><td><b>总价:</b><%= request.getAttribute("totalPrice") %></td></tr></table>
</body>
</html>