使用cookies查询商品详情

易买网项目完工，把一些新知识记录下来，以便以后查阅，也方便他人借阅。介绍使用cookies查询商品详情。

第一步：建立商品实体类。

第二步：连接Oracle数据库。

第三步：使用三层架构。

效果图如下：

当我看中新疆牛肉干，商品点击时，进入查看商品详情页。

 

商品详情页：

核心代码如下：

 <%
    //创建商品业务逻辑对象
    productBiz prodctbiz = new productBizImpl();

List productlist = prodctbiz.findproductList();
 request.setAttribute("productlist",product);
%>
//EL表达式

核心架包
<%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
//EL表达式：

                
                 
class="ck">
                    

                        

                        
class="title">${news.ep_name}
                        
class="price">￥${news.ep_price}.00
                    
                    
                    
                    
                    
        

第二步：在Servlet创建addcookie.java页面,获取商品id：（注意：必须在web.xml写入）

        
    
    addcookie
    class>Servlet.addcookieclass>
    
    
  
  
      addcookie
      /addcookie
  

 

package Servlet;



import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class addcookie extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public addcookie() {
        super();
    }

    /**
     * Destruction of the servlet. 

     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

            doPost(request, response);
    }

    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("utf-8");
         //获取商品id
        String id = request.getParameter("id");
        //转发的页面
        response.setHeader("refresh", "0;url=/yimaiWang/product-view.jsp?id="+id);

        
        
        Cookie[] cookies = request.getCookies();
    
        String visitlist = null;
        if (cookies != null) { 
            for (Cookie cookie : cookies) {
                if (cookie.getName().equals("visitlist")) {
                    visitlist = cookie.getValue();
                    break;
                }
            }
            if (visitlist == null) {
            
                Cookie cookie = new Cookie("visitlist", id);
                cookie.setMaxAge(180);
                response.addCookie(cookie);
                
            } else {
        
                String[] existIds = visitlist.split(",");
                for (String exsitId : existIds) {
                    if (exsitId.equals(id)) {
                        
                        return;
                    }
                }
            
                Cookie cookie = new Cookie("visitlist", visitlist + "," + id);
                cookie.setMaxAge(180);
                response.addCookie(cookie);
                
            }
        } else {
        
            Cookie cookie = new Cookie("visitlist", id);
            cookie.setMaxAge(180);
            response.addCookie(cookie);
            
        }
    }


}

第三步：跳转商品详情页product-view.jsp(这俩个查询语句不同，一个是查询商品id，一个是商品List集合)

public easybuy_product findProductForid(int id) {
    con=this.getConnection();
    int i =id;
    String sql = "select * from easybuy_product where ep_id =?";

    easybuy_product pd = new easybuy_product();
    
    try 
    {
        st=con.prepareStatement(sql);
        st.setInt(1,id);
        rs=st.executeQuery();    
        
        while(rs.next())
        {
            
            
            pd.setEp_id(rs.getInt(1));
            pd.setEp_name(rs.getString(2));
            pd.setEp_description(rs.getString(3));
            pd.setEp_price(rs.getInt(4));
            pd.setEp_stock(rs.getInt(5));
            pd.setEpc_id(rs.getInt(6));
            pd.setEpc_child_id(rs.getInt(7));
            pd.setEp_file_name(rs.getString(8));
        }
    } catch (SQLException e) 
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return null;
    }finally{
        this.ShiFang(rs, st, con);
        
    }
    
    return pd;
}
}

public List product(String id) {
    List listproduct=new ArrayList();
    // TODO Auto-generated method stub

    con = this.getConnection();
    
    String sql="select * from easybuy_product where ep_id=?";
    try {
        st=con.prepareStatement(sql);
        st.setString(1,id);
        rs=st.executeQuery();
        while(rs.next()){
            easybuy_product product = new easybuy_product();
            product.setEp_id(rs.getInt(1));
            product.setEp_name(rs.getString(2));
            product.setEp_description(rs.getString(3));
            product.setEp_price(rs.getInt(4));
            product.setEp_stock(rs.getInt(5));
            product.setEpc_id(rs.getInt(6));
            product.setEpc_child_id(rs.getInt(7));
            product.setEp_file_name(rs.getString(8));
            
              

            listproduct.add(product);
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    
        this.ShiFang(rs, st, con);
    }
    
    return listproduct;
}

 

<%
//获取商品id
int id = Integer.parseInt(request.getParameter("id"));
productBiz bizvoid = new productBizImpl();
easybuy_product shop = bizvoid.findProductForid(id);
request.setAttribute("shop",shop);
%>

<% 
     //获取商品id
request.setCharacterEncoding("utf-8");
String a = request.getParameter("id");
%>
 <%
      
    //创建商品信息业务逻辑对象
  productBiz productbiz = new productBizImpl();

 List list =productbiz.product(a);
  request.setAttribute("list",list);
  
  %>
    
class="main">
     
        
<%=shop.getEp_name() %>
            
        
class="infos">
             
            
class="thumb">
            
class="buy">
            
商品描述：class="price">${product.ep_description}
                
商城价：class="price">￥${product.ep_price}.00
           if test="${product.ep_stock==null}"> 
                      
class="w1 c">缺货
                            if>
                   if test="${product.ep_stock!=null}"> 
                      
class="w1 c">有货
                            if>
                            if test="${name==null}"> 
                            
                            
                            
                            if>

 

转载于:https://www.cnblogs.com/wlx520/p/4578836.html