一、实验目标：
理解MVC模式的基本思想；理解两种模型：模型1及模型
熟练掌握MVC模式的编程。
二、实验内容：
1、继续完成上周未完成的作业；
2、请用模型2完成1个功能，功能自选，例如：登录、注册、计算税收或购物车等；
3、继续完善网上购图书程序，采用MVC模式，完成增加计算商品总价及添加商品数量等功能，用JavaBean改写，其中购物车和商品价格等内容都用JavaBean实现，JSP页面实现增加、删除所选图书，显示所选图书及其价格的功能。尽量用EL表达式或JSTL标签库，少用程序片及表达式。
购物车提示：javaBean：
Book.java：存储一本图书的信息
BookList.java：一条记录，用于记录订单的一条信息(可省略)
CartBook.java：购物车，用于存储用户所有购物信息
JSP：
index.jsp：购图书首页
addbook.jsp:添加一条图书信息至购物车。
delbook.jsp:删除一条图书信息至购物车
showCart.jsp:显示购物车的信息
实验代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注册邮箱</title>
</head>
<body>
<form action="dasedeal"method="post">
<table>
<tr>
<td>您的学号：</td>
<td><input type = "text" name = "UserNum"></td>
</tr>
<tr>
<td>您的姓名：</td>
<td><input type = "text" name = "UserName"></td>
</tr>
<tr>
<td>您的密码：</td>
<td><input type = "password" name = "Usercode"></td>
</tr>
<tr>
<td> 性别: </td>
<td>
<select name = "selectedComs">
<option value="男">男</option>
<option value="女">女</option>
</select>
</td>
</tr>
<tr>
<td><input type = "submit" value ="注册"></td>
<td><input type = "reset" value ="重置"></td>
</tr>
</table>
</form>
</body>
</html>
package beanDemo;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class dasedeal
*/
@WebServlet("/dasedeal")
public class dasedeal extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
//response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String UserNum = request.getParameter("UserNum");
String UserName = request.getParameter("UserName");
String Usercode = request.getParameter("Usercode");
String selectedComs = request.getParameter("selectedComs");
// if (isChinese(UserName)) {
if ( (Usercode == null ||"".equals(Usercode)) || (UserName == null ||"".equals(UserName))) {
request.getRequestDispatcher("fail.jsp").forward(request, response);
}
else {
request.setAttribute("num",UserNum);
request.setAttribute("name",UserName);
request.setAttribute("select",selectedComs );
request.getRequestDispatcher("success.jsp").forward(request, response);
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package beanDemo;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class dasedeal
*/
@WebServlet("/dasedeal")
public class dasedeal extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
//response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String UserNum = request.getParameter("UserNum");
String UserName = request.getParameter("UserName");
String Usercode = request.getParameter("Usercode");
String selectedComs = request.getParameter("selectedComs");
// if (isChinese(UserName)) {
if ( (Usercode == null ||"".equals(Usercode)) || (UserName == null ||"".equals(UserName))) {
request.getRequestDispatcher("fail.jsp").forward(request, response);
}
else {
request.setAttribute("num",UserNum);
request.setAttribute("name",UserName);
request.setAttribute("select",selectedComs );
request.getRequestDispatcher("success.jsp").forward(request, response);
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>对不起，登录失败</title>
</head>
<body>
<h2>对不起，登录失败,请仔细检查数据是否填写正确！</h2>
</body>
</html>
运行结果：
购物车代码
package cc.test.Controller;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.annotation.WebServlet;
import cc.test.vo.*;
/**
* 程序运行的首页
* 在此对书库内容进行初始化
* @author Administrator
*
*/
@WebServlet("/index.do")
public final class InitServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public InitServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session=request.getSession();
ArrayList<Book> bookList=null;//获取图书的相关信息
int num=0;//保存图书的本数
//当第一次访问采购网页，session对象中还没有book购物车信息时，进行初始化。
if (session.getAttribute("bookList")==null){
//在session对象中存储图书采购信息,将来可以换成从数据库中获取
bookList=bookStoreInit();
//将图书信息存入session对象中
session.setAttribute("bookList", bookList);
session.setAttribute("sumNum", String.valueOf(num));
}
//将生成的图书信息显示在网页上
response.sendRedirect("Shopping.jsp");
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
/**
* 初始化图书库
* 用一个列表来临时存储图书信息
* 以后此处可以改为从数据库中查询出图书信息
*/
private static ArrayList<Book> bookStoreInit(){
ArrayList<Book> bookList=null;
bookList = new ArrayList<Book>();
bookList.add(new Book("10101", "Java核心技术", "img\\10101.jpg", 0));
bookList.add(new Book("10102", "Java经典实例", "img\\10102.jpg", 0));
bookList.add(new Book("10103", "Java7", "img\\10103.jpg", 0));
bookList.add(new Book("10104", "JSP&Servlet", "img\\10104.jpg",0));
//System.out.print("init");
return bookList;
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
package cc.test.Controller;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
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 javax.servlet.http.HttpSession;
import cc.test.vo.Book;
/**
* Servlet implementation class DeleteServlet
*/
@WebServlet("/delete.view")
public class DeleteServlet extends HttpServlet {
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
// response.getWriter().append("Served at: ").append(request.getContextPath());
ArrayList<Book> bookList = null;
int bookNum = 0;
int sumNum = 0;
HttpSession session = request.getSession();
String id = request.getParameter("id");
String num1 = request.getParameter("num");
int num = Integer.valueOf(num1);
// int num = Integer.valueOf(request.getParameter("num"));
if(id!=null) {
bookList = (ArrayList<Book>)session.getAttribute("bookList");
sumNum = Integer.parseInt((String)session.getAttribute("sunNum"));
if(bookList != null) {
for(int i= 0; i<bookList.size();i++) {
Book book = bookList.get(i);
if(id.equals(book.getBookId())) {
bookNum = book.getBookNum() - num;
bookList.get(i).setBookNum(bookNum);
}
}
session.setAttribute("bookList", bookList);
session.setAttribute("sumNum", String.valueOf(sumNum-num));
}
}
response.setContentType("utf-8");
response.sendRedirect("cart.veiw");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package cc.test.Controller;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import cc.test.vo.Book;
public class CarServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/*判断得到session对象中存储的book信息是否为空
不为空的前提下，读出Book数组中的内容，并将数目不为1的图书信息显示在网页上。
*/
HttpSession session=request.getSession();
ArrayList<Book> bookList = (ArrayList<Book>)session.getAttribute("booList");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.print("<a href=index.do>返回首页</a>");
out.println("<table border='1'>");
if (bookList!=null) {
for (Book book : bookList) {
if (book.getBookNum()>0) {
out.print("<tr>");
out.print("<td><img src='"+book.getBookImg()+"'></td>");
out.print("<td>"+book.getBookName()+"</td>");
out.print("<td>共有"+book.getBookNum()+"本</td>");
out.print("<td><a href=delete.view?id="+book.getBookId()+"&num=1>删除1本</a></td>");
out.print("<td><a href=delete.view?id="+book.getBookId()+"&num="+book.getBookNum()+">删除所有</a></td>");
out.print("</tr>");
}
}
}
out.print("</table>");
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
package cc.test.Controller;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import cc.test.vo.Book;
public class ShopingServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ArrayList<Book> bookList=null;
int bookNum = 0;
int sumNum=0;
HttpSession session = request.getSession();
//获取从Shopping.jsp传来的request对象中的ID号
String id = request.getParameter("id");
//在ID号不为空的情况下，获取Session对象中的购物车信息，Book对象数组。
//找到数组中与ID对应的Book对象，将其属性bookNum数字加1
//将数组写回session对象中去。
if (id!=null){
bookList = (ArrayList<Book>)session.getAttribute("bookList");
sumNum=Integer.parseInt((String)session.getAttribute("sumNum"));
if (bookList!=null) {
for(int i=0;i<bookList.size();i++) {
Book book = bookList.get(i);
if (id.equals(book.getBookId())) {
bookNum = book.getBookNum()+1;
bookList.get(i).setBookNum(bookNum);
System.out.println(book.getBookName()+"shoppingnum:"+bookNum);
}
}
session.setAttribute("booList", bookList);
session.setAttribute("sumNum", String.valueOf(sumNum+1));
}
}
//跳转回Shopping.jsp
response.setContentType("UTF-8");
response.sendRedirect("Shopping.jsp");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
package cc.test.vo;
public class Book {
private String bookId; //书号
private String bookName;//书名
String bookImg; //书封面所在地址
private int bookNum; //购书本数
public Book(String bookId, String bookName, String bookImg, int bookNum) {
this.bookId = bookId;
this.bookName = bookName;
this.bookImg = bookImg;
this.bookNum = 0;
}
public void setBookNum(int bookNum) {
this.bookNum = bookNum;
}
public String getBookId() {
return bookId;
}
public String getBookName() {
return bookName;
}
public String getBookImg() {
return bookImg;
}
public int getBookNum() {
return bookNum;
}
}
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page import="cc.test.vo.Book" %>
<!--
程序运行的首页是/index.do
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<img src="img/cart.jpg" height="60px" width="60px">
<a href="cart.view">已采购
<c:out value="${sumNum}" default="没有任何"/>本书籍
</a><br>
<br>
<table border="1">
<%
ArrayList<Book> bookList=(ArrayList<Book>)session.getAttribute("bookList");
for (Book book:bookList){
out.println("<tr>") ;
out.println("<td> <img src='"+book.getBookImg()+ "'> </td>");
String id=book.getBookId();
out.println("<td> <a href=shopping.view?id="+id+">采购此书</a></td>");
out.println("</tr>") ;
}
%>
<%-- <c:forEach var="book" items="${bookList}">
<tr>
<td>
<img src='${book.bookImg}'>
</td>
<td><a href="shopping.view?id='${book.bookId }'">采购此书</a></td></tr>
</c:forEach>--%>
</table></body>
</html>
运行结果：
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