用session实现购物车（含设计分析及源代码）part3
2011-11-20 15:43
477 查看
最后的servlet层的编写：
首先是简单商品展示页（IndexServlet.servlet）：
点击商品超链接后显示商品的详细信息(BuyServlet.servlet)：
确认信息（CartServlet.servlet）：
购物车信息（ShowCart.servlet）：
这样我们的session购物车就简单的完成了。还有许多小缺点和bug希望各位积极提出意见。
首先是简单商品展示页（IndexServlet.servlet）：
package cn.zc.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.zc.domain.Product;
import cn.zc.service.ProductServiceImpl;
public class IndexServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Constructor of the object.
*/
public IndexServlet() {
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 {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
ProductServiceImpl psi=new ProductServiceImpl();//数据库service层
List<Product> entities=psi.findAll();//得到数据库数据
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE>");
out.println("<style>a{text-decoration:none;color:#666;font-size:20px;}");
out.println("a:hover{font-size:22px;color:#f00;}");
out.println("</style>");
out.println("</HEAD>");
out.println(" <BODY>");
out.println(" <ul style=\"list-style:none;text-align:left;\">");
for (int i=0;i<entities.size();i++){
out.println("<li><a href=\"BuyServlet?id="+(i+1)+"\">"+"商品名称： "+
//每个列出商品的名称和价格做成超链接点击时提交给BuyServlet
entities.get(i).getName()+" 参考价格： "+
entities.get(i).getPrice()+"</a></li>");
}
out.println(" </ul>");
out.println("<br><br>");
out.println("<a href=\"ShowCart\">查看购物车</a>");// 查看购物车连接跳转到ShowCart.servlet
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}点击商品超链接后显示商品的详细信息(BuyServlet.servlet)：
package cn.zc.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.zc.domain.Product;
import cn.zc.service.ProductServiceImpl;
public class BuyServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Constructor of the object.
*/
public BuyServlet() {
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 {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
ProductServiceImpl psi=new ProductServiceImpl();//数据库service层
int id=Integer.parseInt(request.getParameter("id"));
Product entity=psi.findById(id);//查找出指定id的商品
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.println(" <table border=\"1px\" width=\"500px\" height=\"200px\">");
out.println(" <tr height=\"50px\">");
out.println(" <td>商品名：</td>");
out.println(" <td>"+entity.getName()+"</td>");
out.println(" <td>实惠价：</td>");
out.println(" <td>"+entity.getPrice()+"</td>");
out.println(" </tr>");
out.println(" <tr>");
out.println(" <td>介绍：</td>");
out.println(" <td colspan=\"3\">"+entity.getSummary()+"</td>");
out.println(" </tr>");
out.println(" </table>");
out.println("<br>");
out.println("<form action=\"CarServlet\" method=\"post\">");
//点击下面的“加入购物车”提交按钮将数据提交给CarServlet提示用户已添加至购物车
out.println("<input type=\"hidden\" value=\""+id+"\" name=\"id\">");
out.println("购买数量：<input type=\"input\" name=\"buyNum\">");
out.println("<input type=\"submit\" value=\"加入购物车\">");
out.println("<br><br>");
out.println("<a href=\"IndexServlet\">返回首页继续购物</a>");
out.println("</form>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}确认信息（CartServlet.servlet）：
package cn.zc.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
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 cn.zc.domain.CarProduct;
import cn.zc.domain.Product;
import cn.zc.service.ProductServiceImpl;
public class CarServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Constructor of the object.
*/
public CarServlet() {
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 {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
ProductServiceImpl psi = new ProductServiceImpl();// 数据库service层
int id = Integer.parseInt(request.getParameter("id"));
Product entity = psi.findById(id);// 查找出指定id的商品
HttpSession session = request.getSession();// 创建session
/* 将加入购物车的商品id和购买数量存储到car购物车对象中 */
CarProduct carProduct = new CarProduct(entity, Integer.parseInt(request
.getParameter("buyNum")));
List<CarProduct> car = (List<CarProduct>) session.getAttribute("product");// 用列表存储CarProduct对象
if(car==null){
car=new ArrayList<CarProduct>();
}
car.add(carProduct);// 添加新加入购物车的商品
session.setAttribute("product", car);
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" 物品 : " + carProduct.getName()
+ " 已加入购物车！购买数量是： "
+ carProduct.getBuyNum());
out.println("<br><br>");
out.println("<a href=\"IndexServlet\">返回首页继续购物</a>");
out.println("<a href=\"ShowCart\">查看购物车</a>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* 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);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}购物车信息（ShowCart.servlet）：
package cn.zc.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
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 cn.zc.domain.CarProduct;
public class ShowCart extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Constructor of the object.
*/
public ShowCart() {
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 {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
showCar(request, response);// 调用查看购车函数
out.println(" <br><br><a href=\"IndexServlet\">返回首页继续购物</a>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
public void showCar(HttpServletRequest request, HttpServletResponse response)
throws IOException {// 查看购物车函数
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
List<CarProduct> car;
HttpSession session = request.getSession();
if (session.getAttribute("product") == null) {
out.println(" 你还没有买东西哟！");
} else {
car = (List<CarProduct>) session.getAttribute("product");
Double totalMoney = 0.00;// 消费总金额
out.println(" <table border=1px>");
for (CarProduct entity : car) {//以表格形式显示以购买商品信息
out.println(" <tr><td>商品名：</td><td>" + entity.getName()
+ "</td><td>单价：</td><td>" + entity.getPrice()
+ "<td>购买数量：</td><td>" + entity.getBuyNum()
+ "</td></tr>");
totalMoney += entity.getBuyNum() * entity.getPrice();
}
out.println(" <tr><td colspan=5>消费总额小计(RMB)：</td><td>"
+ totalMoney + "</td></tr>");
out.println(" </table>");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}这样我们的session购物车就简单的完成了。还有许多小缺点和bug希望各位积极提出意见。
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- 用session实现购物车（含设计分析及源代码）part1
- 用session实现购物车（含设计分析及源代码）part2
- BlogEngine.Net架构与源代码分析系列part13：实现分析（上）——HttpHandlers与HttpModules
- BlogEngine.Net架构与源代码分析系列part9：开发扩展（上）——Extension与管理上的实现
- BlogEngine.Net架构与源代码分析系列part14：实现分析（下）——网站页面上值得参考的部分
- 使用session技术来实现网上商城购物车的功能
- Chromium多线程模型设计和实现分析
- Session ArrayList 实现购物车程序
- 使用session实现简单的购物车 （将点击了购买链接的书籍放到购物车页面显示出来）。
- C 标准库 函数 源代码的实现 和 分析
- 购物车的实现及Cookie，session，数据库存储的优缺点
- 设计有穷自动机DFA实现C++简单程序的词法分析、扫描（编译原理实验） 推荐
- 看透springMvc源代码分析与实现这本书中第八章实例总结（controller和View）
- Silverlight企业应用快速开发平台框架设计（二）分析-平台实现重点是什么，要怎么做?
- 设计模式之建造者模式 c++实现和详细分析
- jQuery基于cookie实现的购物车实例分析
- [原创]java WEB学习笔记24：MVC案例完整实践(part 5)---删除操作的设计与实现
- JavaWeb_利用Session实现简易购物车
- cookie实现购物车与session的登录判断
- JAVAEE中用session实现简单的购物车