JavaWeb——Jsp入门JavaBean模式商品展示作业

心已赠人 2021-07-25 13:12 305阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70]

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*  疫情期间 朋友的作业 唉！！！
 *  帮忙搞搞吧

— 创建个Maven项目 （JBoss -->web application都行）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 1]  
来到了我的久违象牙白界面

*  先来看看小老妹的需求  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 2]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 3]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 4]
 *  ojbk 搞起  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 5]

DBHelper类的目的是建立与MySQL数据库的连接。

package util;
    
    import java.sql.Connection;
    import java.sql.DriverManager;
    
    public class DBHelper { 
    
        private static final String DRIVER = "com.mysql.jdbc.Driver";
    
        private static final String USERNAME = "root";
        private static final String PASSWORD = "xxxxxx";
        private static final String dbName = "shop_show";
        private static Connection con = null;
    
    
        private static final String URL ="jdbc:mysql://localhost/"+dbName+"?user="+USERNAME+"&password="+PASSWORD;
        //连接URL为 jdbc:mysql//服务器地址/数据库名?user=登陆用户名&password=密码
    
        //加载数据库驱动
        static { 
            try{ 
                Class.forName(DRIVER);
            }catch(Exception ex){ 
                ex.printStackTrace();
            }
        }
    
        //单例模式返回数据库连接对象
        public static Connection getConnection() throws Exception{ 
            if(con==null){ 
                con = DriverManager.getConnection(URL, USERNAME, PASSWORD);
                return con;
            }
            return con;
        }
    }

mysql启动和关闭外键约束的方法(FOREIGN\_KEY\_CHECKS)

[Err] 1451 -Cannot delete or update a parent row: a foreign key  constraint fails (...)

这是因为MySQL中设置了foreign key关联，造成无法更新或删除数据。可以通过设置FOREIGN\_KEY\_CHECKS变量来避免这种情况。

我们可以使用

SET FOREIGN_KEY_CHECKS=0;

来禁用外键约束.

之后再用

SET FOREIGN_KEY_CHECKS=1;

来启动外键约束.

eg：
    
    SET FOREIGN_KEY_CHECKS = 0;
    DELETE FROM TABLE_NAME_;
    SET FOREIGN_KEY_CHECKS = 1;

查看当前FOREIGN\_KEY\_CHECKS的值可用如下命令

SELECT  @@FOREIGN_KEY_CHECKS;

#### 在navicat中创建 数据库并执行以下语句创建items表和插入数据 ####

SET FOREIGN_KEY_CHECKS=0;
     
    -- ----------------------------
    -- Table structure for items
    -- ----------------------------
    DROP TABLE IF EXISTS `items`;
    CREATE TABLE `items` (
      `id` int(11) NOT NULL auto_increment,
      `name` varchar(50) default NULL,
      `city` varchar(50) default NULL,
      `price` int(11) default NULL,
      `number` int(11) default NULL,
      `picture` varchar(500) default NULL,
      PRIMARY KEY  (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;
     
    -- ----------------------------
    -- Records of items
    -- ----------------------------
    INSERT INTO `items` VALUES ('1', '沃特篮球鞋', '佛山', '180', '500', '001.jpg');
    INSERT INTO `items` VALUES ('2', '安踏运动鞋', '福州', '120', '800', '002.jpg');
    INSERT INTO `items` VALUES ('3', '耐克运动鞋', '广州', '500', '1000', '003.jpg');
    INSERT INTO `items` VALUES ('4', '阿迪达斯T血衫', '上海', '388', '600', '004.jpg');
    INSERT INTO `items` VALUES ('5', '李宁文化衫', '广州', '180', '900', '005.jpg');
    INSERT INTO `items` VALUES ('6', '小米3', '北京', '1999', '3000', '006.jpg');
    INSERT INTO `items` VALUES ('7', '小米2S', '北京', '1299', '1000', '007.jpg');
    INSERT INTO `items` VALUES ('8', 'thinkpad笔记本', '北京', '6999', '500', '008.jpg');
    INSERT INTO `items` VALUES ('9', 'dell笔记本', '北京', '3999', '500', '009.jpg');
    INSERT INTO `items` VALUES ('10', 'ipad5', '北京', '5999', '500', '010.jpg');

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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 7]  
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*  而且 最好不用中文版 --en 毛病太多  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 9]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 10]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 11]![在这里插入图片描述][20200524130119593.png]
 *  且 从新配置下 环境  
    不要忘记在工程文件中导入MySQL对应驱动程序的jar包  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 12]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 13]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 14]

#### 实体类（Items）设计 ####

Items类中数据成员对应表items的属性，
    右键Source选择为每个数据成员进行封装。

package entity;
    
    public class Items { 
    
        private int id; // 商品编号
        private String name; // 商品名称
        private String city; // 商品产地
        private int price; // 商品价格
        private int number; // 商品数量
        private String picture; // 商品图片
    
        public int getId() { 
            return id;
        }
    
        public void setId(int id) { 
            this.id = id;
        }
    
        public String getName() { 
            return name;
        }
    
        public void setName(String name) { 
            this.name = name;
        }
    
        public String getCity() { 
            return city;
        }
    
        public void setCity(String city) { 
            this.city = city;
        }
    
        public int getPrice() { 
            return price;
        }
    
        public void setPrice(int price) { 
            this.price = price;
        }
    
        public int getNumber() { 
            return number;
        }
    
        public void setNumber(int number) { 
            this.number = number;
        }
    
        public String getPicture() { 
            return picture;
        }
    
        public void setPicture(String picture) { 
            this.picture = picture;
        }
    }

#### 业务逻辑类（ItemsDAO）设计 ####

ItemsDAOS类主要是实现以后要在Jsp页面中运送数据的方法，
    包括获取所有商品资料，根据id获取对应商品资料和获取浏览记录中最近5条记录。

package dao;
    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.util.ArrayList;
    
    import entity.Items;
    import util.DBHelper;
    
    import static java.lang.System.out;
    
    public class ItemsDAO { 
    
        //获取数据库内所有的商品资料
        public static ArrayList<Items> getAllItems(){ 
            Connection conn = null;
            PreparedStatement stmt = null;
            ResultSet rs = null;
            ArrayList<Items> list = new ArrayList<Items>();  //商品集合
    
            try{ 
                conn = DBHelper.getConnection();
                String sql = "select * from items;";  //sql语句
                stmt = conn.prepareStatement(sql);
                rs = stmt.executeQuery();
                out.print(rs);
    
                while(rs.next()){ 
                    Items item = new Items();
                    item.setId(rs.getInt("id"));
                    item.setName(rs.getString("name"));
                    item.setCity(rs.getString("city"));
                    item.setPrice(rs.getInt("price"));
                    item.setNumber(rs.getInt("number"));
                    item.setPicture(rs.getString("picture"));
                    list.add(item);  //加入集合
                }
    
                return list;  //返回集合
    
            }catch(Exception ex){ 
                ex.printStackTrace();
                return null;
            }finally{ 
                //释放数据集对象
                if(rs!=null){ 
                    try{ 
                        rs.close();
                        rs = null;
                    }catch(Exception ex){ 
                        ex.printStackTrace();
                    }
                }
                //释放语句对象
                if(stmt!=null){ 
                    try{ 
                        stmt.close();
                        stmt=null;
                    }catch(Exception ex){ 
                        ex.printStackTrace();
                    }
                }
            }
        }
    
    
        //获取最近浏览的5条商品资料
        public ArrayList<Items> getViewList(String list){ 
            ArrayList<Items> itemList = new ArrayList<Items>();
            int iCount=5;//每次返回前五条记录
            if(list!=null&&list.length()>0){ 
                String[] arr = list.split(",");
    
                if(arr.length>=5)
                { 
                    for(int i=arr.length-1;i>=arr.length-iCount;i--){ 
                        itemList.add(getItemById(Integer.valueOf(arr[i])));
                    }
                }
                else{ 
                    for(int i=arr.length-1;i>=0;i--){ 
                        itemList.add(getItemById(Integer.valueOf(arr[i])));
                    }
                }
                return itemList;
            }else { 
                return null;
            }
        }
    
    }

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
    <%@ page import="dao.ItemsDAO" %>
    <%@ page import="entity.Items"  %>
    <%
      String path = request.getContextPath();
      String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
      <base href="<%=basePath%>">
    
      <title>My JSP 'index.jsp' starting page</title>
      <meta http-equiv="pragma" content="no-cache">
      <meta http-equiv="cache-control" content="no-cache">
      <meta http-equiv="expires" content="0">
      <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
      <meta http-equiv="description" content="This is my page">
      
      <style type="text/css">
        div{ 
          float: left;
          margin: 10px;
        }
        div dd{ 
          margin: 0px;
          font-size: 10px;
        }
        div dd.dd_name{ 
          color: blue;
        }
        div dd.dd_city{ 
          color: #000;
        }
      </style>
    </head>
    
    <body>
    <h1>商品展示</h1>
    <hr>
    
    <center>
      <table width="750" height="60" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td>
    
            
            <%
              ItemsDAO itemsDao = new ItemsDAO();
              ArrayList<Items> list = itemsDao.getAllItems();
              if(list!=null&&list.size()>0){ 
                for(int i=0;i<list.size();i++){ 
                  Items item = list.get(i);
            %>
            <div>
              <dl>
                <dt>
                  <a href="details.jsp?id=<%=item.getId() %>"><img src="images/<%=item.getPicture() %>" width="120" height="120"></a>
                </dt>
                <dd class="dd_name"><%=item.getName() %></dd>
                <dd class="dd_city">产地：<%=item.getCity() %>  价格：<%=item.getPrice() %></dd>
              </dl>
            </div>
            
            <%
                }
              }
            %>
    
    <%--        <%@ page contentType="text/html; charset=utf-8" %>--%>
    <%--        <%@ page language="java" %>--%>
    <%--        <%@ page import="com.mysql.jdbc.Driver" %>--%>
    <%--        <%@ page import="java.sql.*" %>--%>
    <%--        <%@ page import="java.util.*" %>--%>
    <%--        <%--%>
    <%--          String driverName="com.mysql.jdbc.Driver"; //驱动程序 --%>
    <%--          String userName="map"; //Mysql用户名 --%>
    <%--          String userPasswd="mapadmin"; //密码 --%>
    <%--          String dbName="maptest";//数据库名 --%>
    <%--          String tableName="deviceinfo";//数据表名 --%>
    
    <%--          String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd;--%>
    <%--          //连接URL为 jdbc:mysql//服务器地址/数据库名?user=登陆用户名&password=密码--%>
    
    <%--          Class.forName("com.mysql.jdbc.Driver").newInstance(); //加载驱动程序 --%>
    <%--          Connection conn=DriverManager.getConnection(url);     //获取数据库连接 --%>
    <%--          Statement stmt = conn.createStatement();              //创建Statement对象 --%>
    <%--          String sql="SELECT * FROM "+tableName;                //SQL语句--%>
    <%--          ResultSet rs = stmt.executeQuery(sql);                //执行SQL语句--%>
    
    <%--          List<String> list = new ArrayList<String>();         //list--%>
    <%--          while(rs.next()) { --%>
    <%--            list.add (rs.getString("Name"));//将Name加入到list中 --%>
    <%--          }--%>
    
    <%--          out.println("打印 list:");--%>
    <%--          out.print(list);--%>
    
    <%--          //关闭资源--%>
    <%--          rs.close();--%>
    <%--          stmt.close();--%>
    <%--          conn.close();--%>
    <%--        %>--%>
    
    
          </td>
        </tr>
      </table>
    </center>
    </body>
    </html>

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
    <%@ page import="dao.ItemsDAO" %>
    <%@ page import="entity.Items"  %>
    <%
        String path = request.getContextPath();
        String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
        <base href="<%=basePath%>">
    
        <title>My JSP 'details.jsp' starting page</title>
    
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
    
        <style type="text/css">
            div{ 
                float: left;
                margin: 10px;
            }
            div dd{ 
                margin: 0px;
                font-size: 10px;
            }
            div dd.dd_name{ 
                color: blue;
            }
            div dd.dd_city{ 
                color: #000;
            }
        </style>
    </head>
    
    <body>
    <h1>商品详情</h1>
    <hr>
    <center>
        <table width="750" height="60" cellpadding="0" cellspacing="0" border="0">
            <tr>
                
                <%
                    ItemsDAO itemsDao = new ItemsDAO();
                    Items item = itemsDao.getItemById(Integer.valueOf(request.getParameter("id")));
                    if(item!=null){ 
                %>
                <td width="70%" valign="top">
                    <table>
                        <tr>
                            <td rowspan="4"><img src="images/<%=item.getPicture() %>" width="200" height="200"/></td>
                        </tr>
                        <tr>
                            <td><B><%=item.getName() %></B></td>
                        </tr>
                        <tr>
                            <td>产地：<%=item.getCity() %></td>
                        </tr>
                        <tr>
                            <td>价格：<%=item.getPrice() %></td>
                        </tr>
                    </table>
                </td>
                <%
                    }
                %>
                <%
                    String list = "";
                    Cookie[] cookies = request.getCookies();
                    if(cookies!=null&&cookies.length>0){ 
                        for(Cookie c: cookies){ 
                            if(c.getName().equals("listViewCookie")){ 
                                list = c.getValue();
                            }
                        }
                    }
                    list+=request.getParameter("id")+",";
                    //如果浏览记录超过1000条，清零
                    String[] arr = list.split(",");
                    if(arr!=null&&arr.length>0){ 
                        if(arr.length>=1000)
                            list = "";
                    }
    
                    Cookie cookie = new Cookie("listViewCookie",list);
                    response.addCookie(cookie);
                %>
                
                <td width="30%" bgcolor="#EEE" align="center">
                    <br>
                    <b>您浏览过的商品</b><br>
                    
                    <%
                        ArrayList<Items> itemsList = itemsDao.getViewList(list);
                        if(itemsList!=null&&itemsList.size()>0){ 
                            for(Items i: itemsList)
                            { 
                    %>
                    <div>
                        <dl>
                            <dt>
                                <a href="details.jsp?id="<%=i.getId() %>"><img src="images/<%=i.getPicture() %>" width="120" height="90" border="1"></a>
                            </dt>
                            <dd class="dd_name"><%=i.getName() %></dd>
                            <dd class="dd_city">产地：<%=i.getCity() %>  价格：<%=i.getPrice() %></dd>
                        </dl>
                    </div>
                    <%
                            }
                        }
                    %>
                    
                </td>
            </tr>
        </table>
    </center>
    </body>
    </html>

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[ 传送门 ][Link 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 17]  
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70]: /images/20210725/ac2fe9ae94474232ac2d4dca024c0ae4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 1]: /images/20210725/527d44eb0a1143539b48bac71356a908.png
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[20200524130119593.png]: /images/20210725/4588ecef1acf42269ed67e635b676a10.png
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[Link 1]: https://www.cnblogs.com/cardiolith/p/9427623.html
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