应用Servlet实现购物车.doc

精品文档应用Servlet实现购物车具体实现过程1、 创建封装商品信息的值JavaBean-GoodsSinglepackage com.yxq.valuebean;public class GoodsSingle private String name;/保存商品名称private float price; /保存商品价格private int num;/保存商品购买数量public String getName() return name;public void setName(String name) = name;public int getNum() return num;public void setNum(int num) this.num = num;public float getPrice() return price;public void setPrice(float price) this.price = price;2、 创建工具JavaBean- MyTools 实现字符型数据转换为整型及乱码处理package com.yxq.toolbean;import java.io.UnsupportedEncodingException;public class MyTools public static int strToint(String str)/将String型数据转换为int型数据的方法if(str=null|str.equals()str=0;int i=0;tryi=Integer.parseInt(str); /把str 转换成 int 类型的变量catch(NumberFormatException e) / try-catch就是监视try中的语句,如果抛出catch中声明的异常类型i=0;e.printStackTrace(); /把Exception的详细信息打印出来return i;public static String toChinese(String str)/进行转码操作的方法if(str=null)str=;try str=new String(str.getBytes(ISO-8859-1),gb2312); catch (UnsupportedEncodingException e) str=;e.printStackTrace();return str;3、 创建购物车JavaBean- ShopCar实现添加、删除，购物车制作package com.yxq.toolbean;package com.yxq.toolbean;import java.util.ArrayList;import com.yxq.valuebean.GoodsSingle;public class ShopCar private ArrayList buylist=new ArrayList();/用来存储购买的商品public void setBuylist(ArrayList buylist) this.buylist = buylist;/* * 功能 向购物车中添加商品 * 参数 single为GoodsSingle类对象，封装了要添加的商品信息 */public void addItem(GoodsSingle single)if(single!=null)if(buylist.size()=0)/如果buylist中不存在任何商品GoodsSingle temp=new GoodsSingle();temp.setName(single.getName();temp.setPrice(single.getPrice();temp.setNum(single.getNum();buylist.add(temp);/存储商品else/如果buylist中存在商品int i=0;for(;i=buylist.size()/说明buylist中不存在要添加的商品GoodsSingle temp=new GoodsSingle();temp.setName(single.getName();temp.setPrice(single.getPrice();temp.setNum(single.getNum();buylist.add(temp);/存储商品/* * 功能 从购物车中移除指定名称的商品 * 参数 name表示商品名称 */public void removeItem(String name)for(int i=0;i1)/如果商品的购买数量大于1temp.setNum(temp.getNum()-1);/则将购买数量减1break; /结束for循环else if(temp.getNum()=1)/如果商品的购买数量为1buylist.remove(i); /从buylist集合对象中移除该商品4、 创建实例首页面index.jsp，初始化商品信息5、 创建处理用户访问首页面请求的Servlet- IndexServletpackage com.yxq.servlet;import java.io.IOException;import java.util.ArrayList;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 com.yxq.valuebean.GoodsSingle;public class IndexServlet extends HttpServlet private static ArrayList goodslist=new ArrayList();protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException doPost(request,response);protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException HttpSession session=request.getSession();session.setAttribute(goodslist,goodslist);response.sendRedirect(show.jsp);static/静态代码块String names=苹果,香蕉,梨,橘子;float prices=2.8f,3.1f,2.5f,2.3f;for(int i=0;i4;i+)GoodsSingle single=new GoodsSingle();single.setName(namesi);single.setPrice(pricesi);single.setNum(1);goodslist.add(single);6、 show.jsp显示商品信息提供商品如下名称价格(元/斤)购买没有商品可显示！% elsefor(int i=0;ia href=doCar?action=buy&id=购买7、 创建处理用户购买、移除、清空购物车请求的Servlet Servlet- BuyServletpackage com.yxq.servlet;import java.io.IOException;import java.util.ArrayList;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 com.yxq.toolbean.MyTools;import com.yxq.toolbean.ShopCar;import com.yxq.valuebean.GoodsSingle;public class BuyServlet extends HttpServlet protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException doPost(request,response);protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException String action=request.getParameter(action);/获取action参数值if(action=null)action=;if(action.equals(buy)/触发了“购买”请求buy(request,response);/调用buy()方法实现商品的购买if(action.equals(remove)/触发了“移除”请求remove(request,response);/调用remove()方法实现商品的移除if(action.equals(clear)/触发了“清空购物车”请求clear(request,response);/调用clear()方法实现购物车的清空/实现购买商品的方法protected void buy(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException HttpSession session=request.getSession();String strId=request.getParameter(id);/获取触发“购买”请求时传递的id参数，该参数存储的是商品在goodslist对象中存储的位置int id=MyTools.strToint(strId);ArrayList goodslist=(ArrayList)session.getAttribute(goodslist);GoodsSingle single=(GoodsSingle)goodslist.get(id);ArrayList buylist=(ArrayList)session.getAttribute(buylist);/从session范围内获取存储了用户已购买商品的集合对象if(buylist=null)buylist=new ArrayList();ShopCar myCar=new ShopCar();myCar.setBuylist(buylist); /将buylist对象赋值给ShopCar类实例中的属性myCar.addItem(single);/调用ShopCar类中addItem()方法实现商品添加操作session.setAttribute(buylist,buylist);response.sendRedirect(show.jsp);/将请求重定向到show.jsp页面/实现移除商品的方法protected void remove(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException HttpSession session=request.getSession();ArrayList buylist=(ArrayList)session.getAttribute(buylist);String name=request.getParameter(name);ShopCar myCar=new ShopCar();myCar.setBuylist(buylist);/将buylist对象赋值给ShopCar类实例中的属性myCar.removeItem(MyTools.toChinese(name);/调用ShopCar类中removeItem ()方法实现商品移除操作response.sendRedirect(shopcar.jsp);/实现清空购物车的方法protected void clear(HttpSe