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  • JAVA遇见HTML——Servlet篇：应用MVC架构实现项目

    java关键字“this”只能用在方法方法体内。当一个对象创建之后，java虚拟机就会给这个对象分配一个引用自身的指针，这个指针的名字就是this。只能在非静态方法中使用

      1 package servlet;
  2 
  3 import java.io.IOException;
  4 import java.io.PrintWriter;
  5 
  6 import javax.servlet.ServletException;
  7 import javax.servlet.http.HttpServlet;
  8 import javax.servlet.http.HttpServletRequest;
  9 import javax.servlet.http.HttpServletResponse;
 10 
 11 public class GetInitParameterServlet extends HttpServlet {
 12     
 13     private String username;//用户名
 14     private String password;//密码
 15     
 16     public String getUsername() {
 17         return username;
 18     }
 19 
 20     public void setUsername(String username) {
 21         this.username = username;
 22     }
 23 
 24     public String getPassword() {
 25         return password;
 26     }
 27 
 28     public void setPassword(String password) {
 29         this.password = password;
 30     }
 31 
 32     /**
 33      * Constructor of the object.
 34      */
 35     public GetInitParameterServlet() {
 36         super();
 37     }
 38 
 39     /**
 40      * Destruction of the servlet. <br>
 41      */
 42     public void destroy() {
 43         super.destroy(); // Just puts "destroy" string in log
 44         // Put your code here
 45     }
 46 
 47     /**
 48      * The doGet method of the servlet. <br>
 49      *
 50      * This method is called when a form has its tag value method equals to get.
 51      * 
 52      * @param request the request send by the client to the server
 53      * @param response the response send by the server to the client
 54      * @throws ServletException if an error occurred
 55      * @throws IOException if an error occurred
 56      */
 57     public void doGet(HttpServletRequest request, HttpServletResponse response)
 58             throws ServletException, IOException {
 59 
 60         doPost(request,response);
 61     }
 62 
 63     /**
 64      * The doPost method of the servlet. <br>
 65      *
 66      * This method is called when a form has its tag value method equals to post.
 67      * 
 68      * @param request the request send by the client to the server
 69      * @param response the response send by the server to the client
 70      * @throws ServletException if an error occurred
 71      * @throws IOException if an error occurred
 72      */
 73     public void doPost(HttpServletRequest request, HttpServletResponse response)
 74             throws ServletException, IOException {
 75 
 76         response.setContentType("text/html;charset=utf-8");
 77         PrintWriter out = response.getWriter();
 78         out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
 79         out.println("<HTML>");
 80         out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
 81         out.println("  <BODY>");
 82         out.print("    This is ");
 83         out.print(this.getClass());
 84         out.println(", using the POST method");
 85         out.println("<h2>"+"用户名："+this.getUsername()+"</h2>");
 86         out.println("<h2>"+"密码："+this.getPassword()+"</h2>");
 87         out.println("  </BODY>");
 88         out.println("</HTML>");
 89         out.flush();
 90         out.close();
 91     }
 92 
 93     /**
 94      * Initialization of the servlet. <br>
 95      *
 96      * @throws ServletException if an error occurs
 97      */
 98     public void init() throws ServletException {
 99         // Put your code here
100         this.setUsername(this.getInitParameter("username"));
101         this.setPassword(this.getInitParameter("password"));
102     }
103 
104 }

    web.xml

     1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" 
 3     xmlns="http://java.sun.com/xml/ns/javaee" 
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 5     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 6     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 7   <display-name></display-name>
 8   <servlet>
 9     <description>This is the description of my J2EE component</description>
10     <display-name>This is the display name of my J2EE component</display-name>
11     <servlet-name>GetInitParameterServlet</servlet-name>
12     <servlet-class>servlet.GetInitParameterServlet</servlet-class>
13       <init-param>
14       <param-name>username</param-name>
15       <param-value>admin</param-value>
16       </init-param>
17       <init-param>
18       <param-name>password</param-name>
19       <param-value>123456</param-value>
20       </init-param>
21   </servlet>
22 
23   <servlet-mapping>
24     <servlet-name>GetInitParameterServlet</servlet-name>
25     <url-pattern>/servlet/GetInitParameterServlet</url-pattern>
26   </servlet-mapping>    
27   <welcome-file-list>
28     <welcome-file>index.jsp</welcome-file>
29   </welcome-file-list>
30 </web-app>
     1 <%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'index.jsp' starting page</title>
13     <meta http-equiv="pragma" content="no-cache">
14     <meta http-equiv="cache-control" content="no-cache">
15     <meta http-equiv="expires" content="0">    
16     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17     <meta http-equiv="description" content="This is my page">
18     <!--
19     <link rel="stylesheet" type="text/css" href="styles.css">
20     -->
21   </head>
22   
23   <body>
24     <h1>获取初始化参数演示案例</h1>
25     <hr>
26     <a href="servlet/GetInitParameterServlet">获取初始化参数servlet</a>
27   </body>
28 </html>

    设计类的时候主要考虑两方面因素：设计这个类的属性和方法

    entity：实体层

    集合类型：序列、set、hashset

    购买商品的集合：用Map类型表示购买商品的集合，键：商品对象，值：商品购买的数量

    键：Items商品类型，值：Integer购买的数量

    代码实现：

     1 package entity;
 2 
 3 import java.util.HashMap;
 4 import java.util.Iterator;
 5 import java.util.Map;
 6 import java.util.Set;
 7 
 8 //购物车类
 9 public class Cart {
10     //购买商品的集合
11     private HashMap<Items,Integer> goods;
12     //购物车的总金额
13     private double totalPrice;
14     //构造方法
15     public Cart() {
16         //初始化属性
17         goods = new HashMap<Items,Integer>();
18         totalPrice=0.0;
19     }
20     public HashMap<Items, Integer> getGoods() {
21         return goods;
22     }
23     public void setGoods(HashMap<Items, Integer> goods) {
24         this.goods = goods;
25     }
26     public double getTotalPrice() {
27         return totalPrice;
28     }
29     public void setTotalPrice(double totalPrice) {
30         this.totalPrice = totalPrice;
31     }
32     
33     //添加商品进购物车的方法
34     public boolean addGoodsInCart(Items item,int number)//参数：商品对象item，商品数量number
35     {//判断购物车是否包含该商品
36         if(goods.containsKey(item))//如果此映射包含对于指定键的映射关系，则返回 true。
37         {
38             goods.put(item, goods.get(item)+number);//在此映射中关联指定值与指定键。
39         }
40         else{//第一次购买这个商品
41             goods.put(item, number);
42         }
43         //当你添加和删除商品之后，都应该重新计算购物车的总金额
44         calTotalPrice();//重新计算购物车的总金额
45         return true;
46     }
47     
48     //删除商品的方法
49     public boolean removeGoodsFromCart(Items item)
50     {
51         goods.remove(item);//从此映射中移除指定键的映射关系（如果存在）。
52         calTotalPrice();//重新计算购物车的总金额
53         return true;
54     }
55     
56     //统计购物车的总金额
57     public double calTotalPrice(){
58         
59         double sum=0.0;
60         //遍历Map类型的集合
61         Set<Items> keys=goods.keySet();//获得键的集合
62         //set类型用for循环是没法遍历的，必须使用迭代器
63         Iterator<Items> it=keys.iterator();//获得迭代器对象
64         //Iterator用while遍历
65         while(it.hasNext()){
66             //遍历商品对象
67             Items i=it.next();
68             //计算总价格：单价*购买数量
69             sum+=i.getPrice()*goods.get(i);//调用get方法取得每个键对应的value
70             }
71         this.setTotalPrice(sum);//设置购物车的总金额
72         return this.getTotalPrice();//返回总金额
73         }
74     public static void main(String[] args){
75         //先创建两个商品对象
76         Items i1 = new Items(1,"沃特篮球鞋","温州",200,500,"001.jpg");
77         Items i2 = new Items(2,"李宁运动鞋","广州",300,500,"002.jpg");
78         Items i3 = new Items(1,"沃特篮球鞋","温州",200,500,"001.jpg");
79     
80         Cart c = new Cart();
81         c.addGoodsInCart(i1, 1);
82         c.addGoodsInCart(i2, 2);
83         //再次购买沃特篮球鞋，购买3双
84         c.addGoodsInCart(i3, 3);
85         
86         // 通过entrySet方法，返回Map中的所有键值对
87         //遍历购物商品的集合
88         Set<Map.Entry<Items, Integer>> items= c.getGoods().entrySet();//Entry<Items, Integer>键值对对象
89         for(Map.Entry<Items, Integer> obj:items)
90         {
91             System.out.println(obj);
92         }
93         
94         
95         System.out.println("购物车的总金额："+c.getTotalPrice());
96     }
97 
98 }

    重写Items类中的两个方法：equals(Object)，hashCode()

     

     1     //改写hashCode生成规则
 2     @Override
 3     public int hashCode() {//hashCode是这个对象的哈希码
 4         // TODO Auto-generated method stub
 5         return this.getId()+this.getName().hashCode();//商品的编号、商品的名称如果这两个都相同，那生成的hashCode也相同（相同的字符串，hashCode也相同）
 6     }
 7 
 8     //判断这两个对象的内容是否相同 
 9     @Override
10     public boolean equals(Object obj) {
11         // 如果当前对象就等于传进来的对象，则这是两个相同的对象
12         if(this==obj){
13             return true;
14         }
15         
16         //判断是否属于商品类
17         if(obj instanceof Items){//使用 instanceof 判断一个实例是否属于某种类型
18             Items i=(Items)obj;
19             //判断商品编号和商品名称都和当前商品完全一样的话,要比较的商品对象和我自身的这个对象它的内容是相同的
20             if(this.getId()==i.getId()&&this.getName().equals(i.getName())){
21                 return true;
22             }
23             else
24             {
25                 return false;
26             }
27         }
28         else{
29             return false;
30         }
31     }

    编写Servlet：添加商品进购物车

    path是项目的根目录，服务器的根目录：WebRoot

    代码实现：

      1 package servlet;
  2 
  3 import java.io.IOException;
  4 import java.io.PrintWriter;
  5 
  6 import javax.servlet.ServletException;
  7 import javax.servlet.http.HttpServlet;
  8 import javax.servlet.http.HttpServletRequest;
  9 import javax.servlet.http.HttpServletResponse;
 10 
 11 import dao.ItemsDAO;
 12 import entity.Cart;
 13 import entity.Items;
 14 
 15 public class CartServlet extends HttpServlet {
 16 
 17     private String action ; //表示购物车的动作 ,add,show,delete
 18     //商品业务逻辑类的对象
 19     private ItemsDAO idao = new ItemsDAO();
 20     
 21     
 22     /**
 23      * Constructor of the object.
 24      */
 25     public CartServlet() {
 26         super();
 27     }
 28 
 29     /**
 30      * Destruction of the servlet. <br>
 31      */
 32     public void destroy() {
 33         super.destroy(); // Just puts "destroy" string in log
 34         // Put your code here
 35     }
 36 
 37     /**
 38      * The doGet method of the servlet. <br>
 39      *
 40      * This method is called when a form has its tag value method equals to get.
 41      * 
 42      * @param request the request send by the client to the server
 43      * @param response the response send by the server to the client
 44      * @throws ServletException if an error occurred
 45      * @throws IOException if an error occurred
 46      */
 47     public void doGet(HttpServletRequest request, HttpServletResponse response)
 48             throws ServletException, IOException {
 49         doPost(request,response);
 50     }
 51 
 52     /**
 53      * The doPost method of the servlet. <br>
 54      *
 55      * This method is called when a form has its tag value method equals to post.
 56      * 
 57      * @param request the request send by the client to the server
 58      * @param response the response send by the server to the client
 59      * @throws ServletException if an error occurred
 60      * @throws IOException if an error occurred
 61      */
 62     public void doPost(HttpServletRequest request, HttpServletResponse response)
 63             throws ServletException, IOException {
 64 
 65         response.setContentType("text/html;charset=utf-8");
 66         PrintWriter out = response.getWriter();
 67         if(request.getParameter("action")!=null)
 68         {
 69             this.action = request.getParameter("action");
 70             if(action.equals("add")) //如果是添加商品进购物车
 71             {
 72                 if(addToCart(request,response))
 73                 {
 74                     request.getRequestDispatcher("/success.jsp").forward(request, response);
 75                 }
 76                 else
 77                 {
 78                     request.getRequestDispatcher("/failure.jsp").forward(request, response);
 79                 }
 80             }
 81             if(action.equals("show"))//如果是显示购物车
 82             {
 83                 request.getRequestDispatcher("/cart.jsp").forward(request, response);
 84             }
 85             if(action.equals("delete")) //如果是执行删除购物车中的商品
 86             {
 87                 if(deleteFromCart(request,response))
 88                 {
 89                     request.getRequestDispatcher("/cart.jsp").forward(request, response);
 90                 }
 91                 else
 92                 {
 93                     request.getRequestDispatcher("/cart.jsp").forward(request, response);
 94                 }
 95             }
 96         }
 97         
 98     }
 99 
100     //添加商品进购物车的方法
101     private boolean addToCart(HttpServletRequest request, HttpServletResponse response)
102     {//商品id
103         String id = request.getParameter("id");
104         //商品数量
105         String number = request.getParameter("num");
106         //商品资料
107         Items item = idao.getItemsById(Integer.parseInt(id));//Integer.parseInt(id)转换成整型
108         
109         //是否是第一次给购物车添加商品,需要给session中创建一个新的购物车对象
110         if(request.getSession().getAttribute("cart")==null)
111         {
112             Cart cart = new Cart();
113             //填到session当中
114             request.getSession().setAttribute("cart",cart);
115         }
116         //获得session对象
117         Cart cart = (Cart)request.getSession().getAttribute("cart");
118         if(cart.addGoodsInCart(item, Integer.parseInt(number)))//Integer.parseInt(number)字符串类型强转成int类型
119         {
120             return true;
121         }
122         else
123         {
124             return false;
125         }
126         
127     }
128     
129     //从购物车中删除商品
130     private boolean deleteFromCart(HttpServletRequest request, HttpServletResponse response)
131     {
132         String id = request.getParameter("id");
133         Cart cart = (Cart)request.getSession().getAttribute("cart");
134         Items item = idao.getItemsById(Integer.parseInt(id));
135         if(cart.removeGoodsFromCart(item))
136         {
137             return true;
138         }
139         else
140         {
141             return false;
142         }
143     }
144     
145     /**
146      * Initialization of the servlet. <br>
147      *
148      * @throws ServletException if an error occurs
149      */
150     public void init() throws ServletException {
151         // Put your code here
152     }
153 
154 }

    detail.jsp

      1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" %>
  2 <%@ page import="entity.Items"%>
  3 <%@ page import="dao.ItemsDAO"%>
  4 <%
  5 String path = request.getContextPath();
  6 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  7 %>
  8 
  9 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 10 <html>
 11   <head>
 12     <base href="<%=basePath%>">
 13     
 14     <title>My JSP 'details.jsp' starting page</title>
 15     
 16     <meta http-equiv="pragma" content="no-cache">
 17     <meta http-equiv="cache-control" content="no-cache">
 18     <meta http-equiv="expires" content="0">    
 19     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 20     <meta http-equiv="description" content="This is my page">
 21     <!--
 22     <link rel="stylesheet" type="text/css" href="styles.css">
 23     -->
 24     <link href="css/main.css" rel="stylesheet" type="text/css">
 25     <script type="text/javascript" src="js/lhgcore.js"></script>
 26     <script type="text/javascript" src="js/lhgdialog.js"></script>
 27     <script type="text/javascript">
 28       function selflog_show(id)//id要购买的商品编号 ，num购买商品数量，&action=add添加商品进购物车，path是项目的根目录，服务器的根目录：WebRoot
 29       { 
 30          var num =  document.getElementById("number").value; 
 31          J.dialog.get({id: 'haoyue_creat',title: '购物成功', 600,height:400, link: '<%=path%>/servlet/CartServlet?id='+id+'&num='+num+'&action=add', cover:true});
 32       }
 33       function add()
 34       {
 35          var num = parseInt(document.getElementById("number").value);
 36          if(num<100)
 37          {
 38             document.getElementById("number").value = ++num;
 39          }
 40       }
 41       function sub()
 42       {
 43          var num = parseInt(document.getElementById("number").value);
 44          if(num>1)
 45          {
 46             document.getElementById("number").value = --num;
 47          }
 48       }
 49      
 50     </script>
 51     
 52     <style type="text/css">
 53        hr{
 54          
 55          border-color:FF7F00; 
 56        }
 57        
 58        div{
 59           float:left;
 60           margin-left: 30px;
 61           margin-right:30px;
 62           margin-top: 5px;
 63           margin-bottom: 5px;
 64          
 65        }
 66        div dd{
 67           margin:0px;
 68           font-size:10pt;
 69        }
 70        div dd.dd_name
 71        {
 72           color:blue;
 73        }
 74        div dd.dd_city
 75        {
 76           color:#000;
 77        }
 78        div #cart
 79        {
 80          margin:0px auto;
 81          text-align:right; 
 82        }
 83        span{
 84          padding:0 2px;border:1px #c0c0c0 solid;cursor:pointer;
 85        }
 86        a{
 87           text-decoration: none; 
 88        }
 89     </style>
 90   </head>
 91   
 92   <body>
 93     <h1>商品详情</h1>
 94     <a href="index.jsp">首页</a> >> <a href="index.jsp">商品列表</a>
 95     <hr>
 96     <center>
 97       <table width="750" height="60" cellpadding="0" cellspacing="0" border="0">
 98         <tr>
 99           <!-- 商品详情 -->
100           <% 
101              ItemsDAO itemDao = new ItemsDAO();
102              Items item = itemDao.getItemsById(Integer.parseInt(request.getParameter("id")));
103              if(item!=null)
104              {
105           %>
106           <td width="70%" valign="top">
107              <table>
108                <tr>
109                  <td rowspan="5"><img src="images/<%=item.getPicture()%>" width="200" height="160"/></td>
110                </tr>
111                <tr>
112                  <td><B><%=item.getName() %></B></td> 
113                </tr>
114                <tr>
115                  <td>产地：<%=item.getCity()%></td>
116                </tr>
117                <tr>
118                  <td>价格：<%=item.getPrice() %>￥</td>
119                </tr>
120                <tr>
121                  <td>购买数量：<span id="sub" onclick="sub();">-</span><input type="text" id="number" name="number" value="1" size="2"/><span id="add" onclick="add();">+</span></td>
122                </tr> 
123              </table>
124              <div id="cart">
125                <img src="images/buy_now.png"><a href="javascript:selflog_show(<%=item.getId()%>)"><img src="images/in_cart.png"></a><a href="servlet/CartServlet?action=show"><img src="images/view_cart.jpg"/></a>
126              </div>
127           </td>
128           <% 
129             }
130           %>
131           <% 
132               String list ="";
133               //从客户端获得Cookies集合
134               Cookie[] cookies = request.getCookies();
135               //遍历这个Cookies集合
136               if(cookies!=null&&cookies.length>0)
137               {
138                   for(Cookie c:cookies)
139                   {
140                       if(c.getName().equals("ListViewCookie"))
141                       {
142                          list = c.getValue();
143                       }
144                   }
145               }
146               
147               list+=request.getParameter("id")+",";
148               //如果浏览记录超过1000条，清零.
149               String[] arr = list.split(",");
150               if(arr!=null&&arr.length>0)
151               {
152                   if(arr.length>=1000)
153                   {
154                       list="";
155                   }
156               }
157               Cookie cookie = new Cookie("ListViewCookie",list);
158               response.addCookie(cookie);
159           
160           %>
161           <!-- 浏览过的商品 -->
162           <td width="30%" bgcolor="#EEE" align="center">
163              <br>
164              <b><font color="#FF7F00">您浏览过的商品</font></b><br>
165              <!-- 循环开始 -->
166              <% 
167                 ArrayList<Items> itemlist = itemDao.getViewList(list);
168                 if(itemlist!=null&&itemlist.size()>0 )
169                 {
170                    System.out.println("itemlist.size="+itemlist.size());
171                    for(Items i:itemlist)
172                    {
173                          
174              %>
175              <div>
176              <dl>
177                <dt>
178                  <a href="details.jsp?id=<%=i.getId()%>"><img src="images/<%=i.getPicture() %>" width="120" height="90" border="1"/></a>
179                </dt>
180                <dd class="dd_name"><%=i.getName() %></dd> 
181                <dd class="dd_city">产地:<%=i.getCity() %>&nbsp;&nbsp;价格:<%=i.getPrice() %> ￥ </dd> 
182              </dl>
183              </div>
184              <% 
185                    }
186                 }
187              %>
188              <!-- 循环结束 -->
189           </td>
190         </tr>
191       </table>
192     </center>
193   </body>
194 </html>

    success.jsp

      1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" %>
  2 <%@ page import="entity.Items"%>
  3 <%@ page import="dao.ItemsDAO"%>
  4 <%
  5 String path = request.getContextPath();
  6 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  7 %>
  8 
  9 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 10 <html>
 11   <head>
 12     <base href="<%=basePath%>">
 13     
 14     <title>My JSP 'details.jsp' starting page</title>
 15     
 16     <meta http-equiv="pragma" content="no-cache">
 17     <meta http-equiv="cache-control" content="no-cache">
 18     <meta http-equiv="expires" content="0">    
 19     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 20     <meta http-equiv="description" content="This is my page">
 21     <!--
 22     <link rel="stylesheet" type="text/css" href="styles.css">
 23     -->
 24     <link href="css/main.css" rel="stylesheet" type="text/css">
 25     <script type="text/javascript" src="js/lhgcore.js"></script>
 26     <script type="text/javascript" src="js/lhgdialog.js"></script>
 27     <script type="text/javascript">
 28       function selflog_show(id)//id要购买的商品编号 ，num购买商品数量，&action=add添加商品进购物车，path是项目的根目录，服务器的根目录：WebRoot
 29       { 
 30          var num =  document.getElementById("number").value; 
 31          J.dialog.get({id: 'haoyue_creat',title: '购物成功', 600,height:400, link: '<%=path%>/servlet/CartServlet?id='+id+'&num='+num+'&action=add', cover:true});
 32       }
 33       function add()
 34       {
 35          var num = parseInt(document.getElementById("number").value);
 36          if(num<100)
 37          {
 38             document.getElementById("number").value = ++num;
 39          }
 40       }
 41       function sub()
 42       {
 43          var num = parseInt(document.getElementById("number").value);
 44          if(num>1)
 45          {
 46             document.getElementById("number").value = --num;
 47          }
 48       }
 49      
 50     </script>
 51     
 52     <style type="text/css">
 53        hr{
 54          
 55          border-color:FF7F00; 
 56        }
 57        
 58        div{
 59           float:left;
 60           margin-left: 30px;
 61           margin-right:30px;
 62           margin-top: 5px;
 63           margin-bottom: 5px;
 64          
 65        }
 66        div dd{
 67           margin:0px;
 68           font-size:10pt;
 69        }
 70        div dd.dd_name
 71        {
 72           color:blue;
 73        }
 74        div dd.dd_city
 75        {
 76           color:#000;
 77        }
 78        div #cart
 79        {
 80          margin:0px auto;
 81          text-align:right; 
 82        }
 83        span{
 84          padding:0 2px;border:1px #c0c0c0 solid;cursor:pointer;
 85        }
 86        a{
 87           text-decoration: none; 
 88        }
 89     </style>
 90   </head>
 91   
 92   <body>
 93     <h1>商品详情</h1>
 94     <a href="index.jsp">首页</a> >> <a href="index.jsp">商品列表</a>
 95     <hr>
 96     <center>
 97       <table width="750" height="60" cellpadding="0" cellspacing="0" border="0">
 98         <tr>
 99           <!-- 商品详情 -->
100           <% 
101              ItemsDAO itemDao = new ItemsDAO();
102              Items item = itemDao.getItemsById(Integer.parseInt(request.getParameter("id")));
103              if(item!=null)
104              {
105           %>
106           <td width="70%" valign="top">
107              <table>
108                <tr>
109                  <td rowspan="5"><img src="images/<%=item.getPicture()%>" width="200" height="160"/></td>
110                </tr>
111                <tr>
112                  <td><B><%=item.getName() %></B></td> 
113                </tr>
114                <tr>
115                  <td>产地：<%=item.getCity()%></td>
116                </tr>
117                <tr>
118                  <td>价格：<%=item.getPrice() %>￥</td>
119                </tr>
120                <tr>
121                  <td>购买数量：<span id="sub" onclick="sub();">-</span><input type="text" id="number" name="number" value="1" size="2"/><span id="add" onclick="add();">+</span></td>
122                </tr> 
123              </table>
124              <div id="cart">
125                <img src="images/buy_now.png"><a href="javascript:selflog_show(<%=item.getId()%>)"><img src="images/in_cart.png"></a><a href="servlet/CartServlet?action=show"><img src="images/view_cart.jpg"/></a>
126              </div>
127           </td>
128           <% 
129             }
130           %>
131           <% 
132               String list ="";
133               //从客户端获得Cookies集合
134               Cookie[] cookies = request.getCookies();
135               //遍历这个Cookies集合
136               if(cookies!=null&&cookies.length>0)
137               {
138                   for(Cookie c:cookies)
139                   {
140                       if(c.getName().equals("ListViewCookie"))
141                       {
142                          list = c.getValue();
143                       }
144                   }
145               }
146               
147               list+=request.getParameter("id")+",";
148               //如果浏览记录超过1000条，清零.
149               String[] arr = list.split(",");
150               if(arr!=null&&arr.length>0)
151               {
152                   if(arr.length>=1000)
153                   {
154                       list="";
155                   }
156               }
157               Cookie cookie = new Cookie("ListViewCookie",list);
158               response.addCookie(cookie);
159           
160           %>
161           <!-- 浏览过的商品 -->
162           <td width="30%" bgcolor="#EEE" align="center">
163              <br>
164              <b><font color="#FF7F00">您浏览过的商品</font></b><br>
165              <!-- 循环开始 -->
166              <% 
167                 ArrayList<Items> itemlist = itemDao.getViewList(list);
168                 if(itemlist!=null&&itemlist.size()>0 )
169                 {
170                    System.out.println("itemlist.size="+itemlist.size());
171                    for(Items i:itemlist)
172                    {
173                          
174              %>
175              <div>
176              <dl>
177                <dt>
178                  <a href="details.jsp?id=<%=i.getId()%>"><img src="images/<%=i.getPicture() %>" width="120" height="90" border="1"/></a>
179                </dt>
180                <dd class="dd_name"><%=i.getName() %></dd> 
181                <dd class="dd_city">产地:<%=i.getCity() %>&nbsp;&nbsp;价格:<%=i.getPrice() %> ￥ </dd> 
182              </dl>
183              </div>
184              <% 
185                    }
186                 }
187              %>
188              <!-- 循环结束 -->
189           </td>
190         </tr>
191       </table>
192     </center>
193   </body>
194 </html>

    failure.jsp

     1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'success.jsp' starting page</title>
13       <meta http-equiv="pragma" content="no-cache">
14     <meta http-equiv="cache-control" content="no-cache">
15     <meta http-equiv="expires" content="0">    
16     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17     <meta http-equiv="description" content="This is my page">
18     <!--
19     <link rel="stylesheet" type="text/css" href="styles.css">
20     -->
21 
22   </head>
23   
24   <body>
25     <center>
26       <img src="images/add_cart_failure.jpg"/>
27       <hr>
28       
29       <br>
30       <br>
31       <br>
32       
33     </center>
34   </body>
35 </html>

     显示购物车

    商品删除

    带有确认功能的对话框
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  • 原文地址：https://www.cnblogs.com/songsongblue/p/9757088.html
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