1 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
2 <%--
3 Created by IntelliJ IDEA.
4 User: tony
5 Date: 2019/8/29
6 Time: 16:53
7 To change this template use File | Settings | File Templates.
8 --%>
9 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
10 <html>
11 <head>
12 <title>我的购物车</title>
13 <%--导入bootstrap框架--%>
14 <link rel="stylesheet" href="../bootstrap/css/bootstrap.min.css">
15 <script src="../bootstrap/js/jquery.min.js"></script>
16 <script src="../bootstrap/js/bootstrap.min.js"></script>
17 </head>
18 <body>
19
20 <div class="container">
21
22 <div class="panel panel-primary">
23 <div class="panel-heading">
24 <h1>我的购物车</h1>
25 </div>
26 <div class="panel-body">
27
28 <table class="table table-striped table-bordered table-hover text-center">
29
30 <tr>
31 <td>编号</td>
32 <td>图片</td>
33 <td>菜名</td>
34 <td>风味</td>
35 <td>餐馆</td>
36 <td>价格</td>
37 <td>数量</td>
38 <td>小计</td>
39 <td>操作</td>
40 </tr>
41
42 <c:forEach items="${car.map}" var="m">
43 <tr>
44 <td>${m.value.fid}</td>
45 <td><img width="35px" src="../${m.value.img}"/></td>
46 <td>${m.value.fname}</td>
47 <td>${m.value.ftype}</td>
48 <td>${m.value.fshop}</td>
49 <td>${m.value.fprice}.00元</td>
50 <td>
51 <a href="/food?param=change&cha=jian&fid=${m.value.fid}" style="text-decoration: none;" class="btn btn-primary glyphicon glyphicon-minus"></a>
52 ${m.value.itemNum}
53 <a href="/food?param=change&cha=jia&fid=${m.value.fid}" style="text-decoration: none;" class="btn btn-primary glyphicon glyphicon-plus"></a>
54 </td>
55 <td>${m.value.itemPrice}.00元</td>
56 <td>
57 <a class="btn btn-danger" href="/food?param=removeall&fid=${m.value.fid}">移除全部</a>
58 </td>
59 </tr>
60 </c:forEach>
61
62 <tr>
63 <td colspan="9">
64 数量共：${car.sumnum}件， 总金额：${car.sumprice}.00元，
65 </td>
66 </tr>
67
68 </table>
69 <a class="btn btn-success btn-lg btn-block" href="/food?param=list">继续点餐</a>
70 </div>
71
72 <div class="panel-footer text-right">
73 海底捞列表页
74 </div>
75 </div>
76
77 </div>
78
79 </body>
80 </html>
1 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
2 <%--
3 Created by IntelliJ IDEA.
4 User: Administrator
5 Date: 2019/8/29
6 Time: 19:57
7 To change this template use File | Settings | File Templates.
8 --%>
9 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
10 <html>
11 <head>
12 <title>海底捞列表页</title>
13 <link rel="stylesheet" href="../bootstrap/css/bootstrap.min.css">
14 <script src="../bootstrap/js/jquery.min.js"></script>
15 <script src="../bootstrap/js/bootstrap.min.js"></script>
16 </head>
17 <body>
18 <div class="container">
19 <div class="panel panel-primary">
20 <div class="panel-heading">
21 <h1>海底捞列表页</h1>
22 </div>
23 <div class="panel-body">
24 <div class="form-group">
25 <div class="row">
26 <c:forEach items="${flist}" var="f">
27 <div class="col-md-3">
28 <div class="thumbnail">
29 <img src="../${f.img}">
30 <div class="caption">
31 <h5>${f.fname}(${f.fshop}:${f.ftype})</h5>
32 <p>￥：${f.fprice}元</p>
33 <p>
34 <a href="/food?param=add&foodid=${f.fid}" class="btn btn-primary" role="button">开始点餐</a>
35 <a href="#" class="btn btn-warning" role="button">查看评论</a>
36 </p>
37 </div>
38 </div>
39 </div>
40 </c:forEach>
41 </div>
42 </div>
43 <a href="/food?param=view" class="btn btn-primary col-md-3 btn-lg" style="float: right;">查看购物车</a>
44 </div>
45 <div class="panel-footer text-right">
46 海底捞列为您服务
47 </div>
48 </div>
49 </div>
50 </body>
51 </html>
1 package com.food.servlet;
2
3 import com.food.dao.FoodDao;
4 import com.food.entity.Car;
5 import com.food.entity.Car2;
6 import com.food.entity.CarItem;
7 import com.food.entity.Food;
8
9 import javax.servlet.ServletException;
10 import javax.servlet.annotation.WebServlet;
11 import javax.servlet.http.HttpServlet;
12 import javax.servlet.http.HttpServletRequest;
13 import javax.servlet.http.HttpServletResponse;
14 import javax.servlet.http.HttpSession;
15 import java.io.IOException;
16 import java.math.BigDecimal;
17 import java.util.HashMap;
18 import java.util.Map;
19
20 @WebServlet("/food")
21 public class FoodServlet extends HttpServlet {
22 //需要一个dao对象
23 private FoodDao foodDao = new FoodDao();
24
25 /**
26 * dopost，根据参数名判断进入哪一个servlet
27 * @param request
28 * @param response
29 * @throws ServletException
30 * @throws IOException
31 */
32 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
33 doGet(request,response);
34 }
35
36 /**
37 * doget
38 * @param request
39 * @param response
40 * @throws ServletException
41 * @throws IOException
42 */
43 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
44 String param = request.getParameter("param");//param=list
45 if (!(param==null || "".equals(param))){
46 if ("list".equals(param)){////展示所有的菜品信息
47 foodlist(request,response);
48 } else if ("add".equals(param)) {//点餐
49 foodadd(request,response);
50 } else if ("view".equals(param)) {//查看购物车
51 foodview(request,response);
52 } else if ("removeall".equals(param)){
53 foodremoveall(request,response);
54 } else if("change".equals(param)){
55 foodchange(request,response);
56 }else{
57 throw new RuntimeException("参数错误。。。。");
58 }
59 }
60
61 }
62
63 /**
64 * 购物车中加-减按钮servlet
65 * @param request
66 * @param response
67 * @throws IOException
68 */
69 private void foodchange(HttpServletRequest request, HttpServletResponse response) throws IOException {
70 HttpSession session = request.getSession();
71 Car2 car = (Car2) session.getAttribute("car");
72 Map<Integer, CarItem> map = car.getMap();
73 String cha = request.getParameter("cha");
74 String fid = request.getParameter("fid");
75 CarItem carItem = map.get(Integer.parseInt(fid));
76 if ("jian".equals(cha)){
77 if (carItem.getItemNum()-1<1){
78 carItem.setItemNum(0);
79 }else{
80 carItem.setItemNum(carItem.getItemNum()-1);
81 }
82 }else if ("jia".equals(cha)){
83 carItem.setItemNum(carItem.getItemNum()+1);
84 }
85 map.put(Integer.parseInt(fid),carItem);
86 car.setMap(map);
87 session.setAttribute("car",car);
88 response.sendRedirect("/html/foodcar.jsp");
89 }
90
91 /**
92 * 购物车中移除按钮servlet
93 * @param request
94 * @param response
95 * @throws IOException
96 */
97 private void foodremoveall(HttpServletRequest request, HttpServletResponse response) throws IOException {
98 String fid = request.getParameter("fid");
99 HttpSession session = request.getSession();
100 Car2 car = (Car2)session.getAttribute("car");
101 Map<Integer, CarItem> map = car.getMap();
102 map.remove(Integer.parseInt(fid));
103 car.setMap(map);
104 session.setAttribute("car",car);
105 response.sendRedirect("/html/foodcar.jsp");
106 }
107
108 /**
109 * 菜品展示servlet
110 * @param request
111 * @param response
112 * @throws IOException
113 */
114 private void foodview(HttpServletRequest request, HttpServletResponse response) throws IOException {
115 response.sendRedirect("/html/foodcar.jsp");
116 }
117
118 /**
119 * 菜品添加servlet
120 * @param request
121 * @param response
122 * @throws ServletException
123 * @throws IOException
124 */
125 private void foodadd(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
126 //获取菜品id
127 String foodid = request.getParameter("foodid");
128 //找到菜品
129 Food food = foodDao.findFoodById(Integer.parseInt(foodid));
130 //构造一个session
131 HttpSession session = request.getSession();
132 //从session中拿购物车(car)对象
133 Object obj = session.getAttribute("car");
134 //声明一个map对象
135 Map<Integer,CarItem> map = null;
136 //构造一个空的购物车
137 Car2 car = new Car2();
138 if (obj == null){//第一次添加到购物车
139 //构造一个map对象
140 map = new HashMap<>();
141 //构造子项
142 CarItem i = new CarItem();
143 i.setImg(food.getImg());
144 i.setFname(food.getFname());
145 i.setFshop(food.getFshop());
146 i.setFtype(food.getFtype());
147 i.setFid(food.getFid());
148 i.setFprice(food.getFprice());
149 //小计金额与小计数量
150 i.setItemNum(1);
151 i.setItemPrice(food.getFprice()*1);
152 //添加到集合中
153 map.put(food.getFid(),i);
154 }else {//购物车中有小项
155 //判断添加的菜品是否有重复的,怎么判断?
156 map = ((Car2)obj).getMap();//转换为购物车对象,从购物车中拿到map对象
157 boolean b = map.keySet().contains(food.getFid());//根据菜品的id判断
158 if (b){//重复的菜品,数量加一，小计已经在CarItem类中计算了
159 CarItem carItem = map.get(food.getFid());
160 carItem.setItemNum(carItem.getItemNum()+1);
161 }else{//不是重复的菜品
162 //构造子项
163 CarItem i = new CarItem();
164 i.setImg(food.getImg());
165 i.setFname(food.getFname());
166 i.setFshop(food.getFshop());
167 i.setFtype(food.getFtype());
168 i.setFid(food.getFid());
169 i.setFprice(food.getFprice());
170 //小计金额与小计数量
171 i.setItemNum(1);
172 i.setItemPrice(food.getFprice()*1);
173 //添加到集合中
174 map.put(food.getFid(),i);
175 }
176 }
177 System.out.println("总金额"+car.getSumnum()+car.getSumprice());
178 car.setMap(map);
179 session.setAttribute("car",car);
180 response.sendRedirect("/html/foodcar.jsp");
181 }
182
183 /**
184 * 菜品列表servlet
185 * @param request
186 * @param response
187 * @throws ServletException
188 * @throws IOException
189 */
190 private void foodlist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
191 request.setAttribute("flist",foodDao.getFoodList());
192 request.getRequestDispatcher("/html/foodlist.jsp").forward(request,response);
193 }
194 }
1 package com.food.entity;
2
3 import java.math.BigDecimal;
4 import java.util.Iterator;
5 import java.util.Map;
6
7 /**
8 * 购物车
9 * 包括每一种菜品小项 总计每一种菜品数量（不包括相同的菜品）、总计金额
10 */
11 public class Car2 {
12 private int sumnum;//总数量数量
13 private int sumprice;//总金额
14 private Map<Integer,CarItem> map;//购物车中的每一项（每一个菜品信息）
15
16 public Car2() {
17 }
18
19 @Override
20 public String toString() {
21 return "Car2{" +
22 "sumnum=" + sumnum +
23 ", sumprice=" + sumprice +
24 ", map=" + map +
25 '}';
26 }
27
28 public int getSumnum() {
29 return sumnum;
30 }
31
32 public void setSumnum(int sumnum) {
33 this.sumnum = sumnum;
34 }
35
36 public int getSumprice() {
37 return sumprice;
38 }
39
40 public void setSumprice(int sumprice) {
41 this.sumprice = sumprice;
42 }
43
44 public Map<Integer, CarItem> getMap() {
45 return map;
46 }
47
48 /**
49 * 计算总数量与计算总价格
50 * @param map
51 */
52 public void setMap(Map<Integer, CarItem> map) {
53 int a = 0;
54 int b = 0;
55 Iterator<CarItem> i = map.values().iterator();
56 while (i.hasNext()){
57 CarItem c = i.next();
58 a+=c.getItemNum();
59 b+=c.getItemPrice();
60 }
61 this.sumnum=a;
62 this.sumprice=b;
63 this.map = map;
64 }
65 }
1 package com.food.entity;
2
3 import java.io.Serializable;
4 import java.math.BigDecimal;
5
6 /**
7 * 购物车中每一个小项
8 * 小项中包括food类中的 信息 与小计数量、小计金额
9 */
10 public class CarItem extends Food implements Serializable {
11 private int itemNum;//购物车中小项的菜品数量
12 private int itemPrice;//购物车中小项的菜品价格小计
13
14 public CarItem() {
15 }
16
17 @Override
18 public String toString() {
19 return "CarItem{" +
20 "itemNum=" + itemNum +
21 ", itemPrice=" + itemPrice +
22 '}';
23 }
24
25 public int getItemNum() {
26 return itemNum;
27 }
28
29 public void setItemNum(int itemNum) {
30 this.itemNum = itemNum;
31 }
32
33 public int getItemPrice() {
34 return this.getItemNum()*this.getFprice();
35 }
36
37 public void setItemPrice(int itemPrice) {
38 this.itemPrice = itemPrice;
39 }
40 }
1 package com.food.entity;
2
3 import java.io.Serializable;
4 import java.math.BigDecimal;
5
6 /**
7 * 菜品类
8 */
9 public class Food implements Serializable {
10 private int fid;//int(11) NOT NULL购物车id
11 private String fname;//varchar(20) NULL购物车商品名称
12 private String ftype;//varchar(20) NULL购物车中商品类型
13 private String fshop;//varchar(100) NULL购物车中的商品
14 private int fprice;//decimal(9,2) NULL价格
15 private String img;//varchar(30) NULL图片
16
17 @Override
18 public String toString() {
19 return "Food{" +
20 "fid=" + fid +
21 ", fname='" + fname + '\'' +
22 ", ftype='" + ftype + '\'' +
23 ", fshop='" + fshop + '\'' +
24 ", fprice=" + fprice +
25 ", img='" + img + '\'' +
26 '}';
27 }
28
29 public Food() {
30 }
31
32 public int getFid() {
33 return fid;
34 }
35
36 public void setFid(int fid) {
37 this.fid = fid;
38 }
39
40 public String getFname() {
41 return fname;
42 }
43
44 public void setFname(String fname) {
45 this.fname = fname;
46 }
47
48 public String getFtype() {
49 return ftype;
50 }
51
52 public void setFtype(String ftype) {
53 this.ftype = ftype;
54 }
55
56 public String getFshop() {
57 return fshop;
58 }
59
60 public void setFshop(String fshop) {
61 this.fshop = fshop;
62 }
63
64 public int getFprice() {
65 return fprice;
66 }
67
68 public void setFprice(int fprice) {
69 this.fprice = fprice;
70 }
71
72 public String getImg() {
73 return img;
74 }
75
76 public void setImg(String img) {
77 this.img = img;
78 }
79 }
页面效果
