JSP教程第7、8讲笔记

继续开发网上购物商城
先解决页面显示的问题
显示商品的具体信息
首页面的分页功能
用户登录、注册界面设计
将商品添加到购物车，将商品从购物车删除，清空购物车，修改购物车的数量，购物流程mvc设计
难点，修改需要购买的商品数量，使用隐藏表单

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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"><link rel="stylesheet" type="text/css" href="mycss/Untitled-3.css"></head><body><table width="80%" border="0.5" align="center"><tr><td height="117" colspan="2" align="center"><jsp:include flush="true" page="head.jsp"></jsp:include></td></tr><tr><td width="21%" height="198"><jsp:include flush="true" page="left.jsp"></jsp:include></td></td><td width="74%"><jsp:include flush="true" page="right.jsp"></jsp:include></td></td></tr><tr><td height="121" colspan="2" align="center"><jsp:include flush="true" page="tail.jsp"></jsp:include></td></tr>
</table></body>
</html>

head.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<table width="100%" border="0.5"><tr><td height="10" colspan="3" bgcolor="#FF9999"></td></tr><tr><td width="26%" align="center"><img src="data:images/logo5.jpg" width="183" height="53" align="middle" /></td><td width="40%" align="center" valign="middle"><img src="data:images/logo22.jpg" width="367" height="85" align="middle" /></td><td width="13%" align="center" valign="middle" bordercolor="#FFFFFF"><p><img src="data:images/logo1.jpg" width="30" height="29" align="top" />【我的账号】</p><p><img src="data:images/logo12.jpg" width="32" height="28" /><a href="ShoppingClServlet?type=show">【我的购物车】</a></p></td></tr><tr><td height="10" colspan="3" bgcolor="#FF99FF"></td></tr><tr><td colspan="3"><table width="100%" border="0.5" align="center"><tr><td width="15%" align="center" class="navi">首页</td><td width="13%" align="center">&nbsp;</td><td width="13%" align="center" class="navi">香港电影</td><td width="13%" align="center">&nbsp;</td><td width="13%" align="center" class="navi">大陆电影</td><td width="10%" align="center">&nbsp;</td><td width="11%" align="center" class="navi">关于我们</td><td width="12%" align="center">&nbsp;</td></tr></table></td></tr>
</table>

tail.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><table width="100%" border="0" align="center"><tr><td align="center" bgcolor="#FF6699" class="abc">合作伙伴：搜狐 网易 腾讯 新浪</td></tr><tr><td align="center" class="abc">地址：湖北省十堰市 客户热线：400-820-8820</td></tr><tr><td align="center" class="abc">邮编：100000 客服邮箱：fashionshopping@sina.com</td></tr><tr><td align="center" class="abc">Copyright 天马星空科技有限公司</td></tr>
</table>

left.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<table width="100%" border="0.5" align="center"><tr><td align="center" valign="middle"><table width="100%" border="0.5"><tr><td align="center"><img src="data:images/9.jpg" width="276" height="50" /></td></tr><tr><td align="center">滚动的图片</script></td></tr></table></td></tr><tr><td valign="middle" bgcolor="#FF66FF">&nbsp;</td></tr><tr><td valign="middle"><table width="100%" border="0.5"><tr><td colspan="3" align="center"><img src="data:images/logo23.jpg" width="190" height="75" /></td></tr><tr><td align="center" class="abc">销量榜</td><td align="center" class="abc">商品名称</td><td align="center" class="abc">点击次数</td></tr><tr><td align="center" class="abc">1</td><td align="center" class="abc"><a href="head.html">倚天屠龙记</a></td><td align="center" class="abc">55</td></tr><tr><td align="center" class="abc">2</td><td align="center" class="abc">西游记</td><td align="center" class="abc">11</td></tr><tr><td align="center" class="abc">3</td><td align="center" class="abc">笑傲江湖</td><td align="center" class="abc">5</td></tr><tr><td align="center" class="abc">4</td><td align="center" class="abc">西厢记</td><td align="center" class="abc">4</td></tr><tr><td align="center" class="abc">5</td><td align="center" class="abc">红楼梦</td><td align="center" class="abc">3</td></tr><tr><td align="center" class="abc">6</td><td align="center" class="abc">水浒传</td><td align="center" class="abc">2</td></tr><tr><td align="center" class="abc">7</td><td align="center" class="abc">射雕英雄传</td><td align="center" class="abc">1</td></tr></table></td></tr>
</table>

right.jsp

<%@ page language="java" import="java.util.*,com.tingwei.model.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";//使用GoodsBeanBO，完成分页（也可以先走servlet）
GoodsBeanBO gbb=new GoodsBeanBO();
String s_pageNow=(String)request.getAttribute("pageNow");
int pageSize=9;
int pageNow=1;
if(s_pageNow!=null)
{pageNow=Integer.parseInt(s_pageNow);
}
//默认显示第一页
ArrayList al=gbb.getGoodsByPage(pageSize,pageNow);
//得到总共有多少页
int pageCount=gbb.getPageCount(pageSize);
%>
<table width="80%" border="0.5" align="center"><tr valign="middle"><td colspan="3" align="center" class="abc"><img src="data:images/logo24.jpg" width="203" height="47" /></td></tr><tr><td width="32%" align="center" valign="middle" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(0)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(0)).getGoodsId() %>"><%=((GoodsBean)al.get(0)).getGoodsName() %></a></td><td width="30%" align="center" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(1)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(1)).getGoodsId() %>"><%=((GoodsBean)al.get(1)).getGoodsName() %></a></td><td width="38%" align="center" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(2)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(2)).getGoodsId() %>"><%=((GoodsBean)al.get(2)).getGoodsName() %></a></td></tr><tr><td width="32%" align="center" valign="middle" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(3)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(3)).getGoodsId() %>"><%=((GoodsBean)al.get(3)).getGoodsName() %></a></td><td width="30%" align="center" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(4)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(4)).getGoodsId() %>"><%=((GoodsBean)al.get(4)).getGoodsName() %></a></td><td width="38%" align="center" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(5)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(5)).getGoodsId() %>"><%=((GoodsBean)al.get(5)).getGoodsName() %></a></td></tr><tr><td width="32%" align="center" valign="middle" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(6)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(6)).getGoodsId() %>"><%=((GoodsBean)al.get(6)).getGoodsName() %></a></td><td width="30%" align="center" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(7)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(7)).getGoodsId() %>"><%=((GoodsBean)al.get(7)).getGoodsName() %></a></td><td width="38%" align="center" class="abc"><p><img src="data:images/<%=((GoodsBean)al.get(8)).getPhoto() %>" width="100" height="100" /></p><a href="ShowGoodsClServlet?type=showItem&id=<%=((GoodsBean)al.get(8)).getGoodsId() %>"><%=((GoodsBean)al.get(8)).getGoodsName() %></a></td></tr>
<tr>
<td colspan="3" align="center">
<%if(pageNow!=1){%><a href="ShowGoodsClServlet?type=fenye&pageNow=<%=pageNow-1%>">上一页</a>&nbsp;<%}%><%  for(int i=1;i<=pageCount;i++){%><a href="ShowGoodsClServlet?type=fenye&pageNow=<%=i %>">[<%=i %>]</a><% }%><%if(pageNow!=pageCount){%><a href="ShowGoodsClServlet?type=fenye&pageNow=<%=pageNow+1%>">下一页</a>&nbsp;<%}%>
</td>
</tr>
</table>

showItem.jsp

<%@ page language="java" import="java.util.*,com.tingwei.model.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
//取出要显示的信息
GoodsBean gb=(GoodsBean)request.getAttribute("goodsInfo");
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>My JSP 'showItem.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"><link rel="stylesheet" type="text/css" href="mycss/Untitled-3.css"><script type="text/javascript">//响应返回购物大厅事件function returnHall(){window.open("index.jsp","_self");}//响应点击购买货物的事件，用此函数检测window.alert(goodsId);function addGoods(goodsId){window.open("ShoppingClServlet?type=addGoods&goodsId="+goodsId,"_self");}</script></head><body>
<table width="80%" border=0 align="center"><tr><td align="center"><jsp:include flush="true" page="head.jsp"></jsp:include></td></tr><tr><td height="309" align="center"><table width="100%" border="1px"><tr><td colspan="2">&nbsp;</td></tr><tr><td width="25%" rowspan="7"><img src="data:images/<%=gb.getPhoto() %>" width="267" height="166" /></td><td align="center"><%=gb.getGoodsName() %></td></tr><tr><td align="left">价格：<%=gb.getGoodsPrice() %> </td></tr><tr><td align="left">&nbsp;</td></tr><tr><td align="left">ISBN:<%=gb.getGoodsId()%></td></tr><tr><td align="left">类型：<%=gb.getType() %></td></tr><tr><td align="left">出版商:<%=gb.getPublisher() %></td></tr><tr><td align="left">简介：<%=gb.getGoodsIntro() %></td></tr><tr><td colspan="2">&nbsp;</td></tr><tr><td height="43" colspan="2"><form id="form1" name="form1" method="post" action="返回购物大厅"><label><input type="button" name="Submit" onclick="addGoods(<%=gb.getGoodsId() %>);" value="购买" /></label><input type="button" name="Submit2" onclick="returnHall();" value="返回购物大厅" /></form></td></tr></table></td></tr><tr><td height="22" align="center"><jsp:include flush="true" page="tail.jsp"></jsp:include></td></tr>
</table></body>
</html>

shoppingCar.jsp

<%@ page language="java" import="java.util.*,com.tingwei.model.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
//取出ArrayList里的购物信息
ArrayList al=(ArrayList)request.getAttribute("myCarInfo");
//从session中取出购物车
ShoppingBO sbo=(ShoppingBO)session.getAttribute("mycar");
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>My JSP 'showShoppingCar.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"><link rel="stylesheet" type="text/css" href="mycss/Untitled-3.css"><script type="text/javascript">function delAll(){window.open("ShoppingClServlet?type=delAll","-self");}</script></head><body><center><table width="80%" border="1" align="center"><tr><td align="center"><jsp:include flush="true" page="head.jsp"></jsp:include></td></tr><tr><td align="center"><form action="ShoppingClServlet?type=updateGoods" method="post"><table width="100%" border="1"><tr><td colspan="6" align="center"><img src="data:images/logo3.jpg" width="756" height="66" align="middle" /></td></tr><tr><td width="29%" align="center" valign="middle">编号</td><td width="16%" align="center" valign="middle">书名</td><td width="16%" align="center" valign="middle">单价</td><td colspan="3" align="left" valign="middle">数量</td></tr><%for(int i=0;i<al.size();i++){GoodsBean gb=(GoodsBean)al.get(i);%><tr><td align="center" valign="middle"><%=gb.getGoodsId() %></td><td align="center" valign="middle"><%=gb.getGoodsName() %></td><td align="center" valign="middle">￥<%=gb.getGoodsPrice() %></td><td width="13%" ><input type="hidden" name="goodsId" value="<%=gb.getGoodsId() %>"/><input name="newNums" type="text" value="<%=sbo.getGoodsNumById(gb.getGoodsId()+"") %>" size="7"/>&nbsp;</td><td width="13%" ><a href="ShoppingClServlet?type=delGoods&goodsId=<%=gb.getGoodsId() %>">删除</a></td><td width="13%" ><a href="ShowGoodsClServlet?type=showItem&id=<%=gb.getGoodsId() %>">查看</a></td></tr><%}%><tr><td align="center" valign="middle">&nbsp;</td><td align="center" valign="middle"><input type="submit" name="Submit" onclick="delAll();" value="删除全部书籍" />  </td><td align="center" valign="middle">&nbsp;<input type="submit" name="Submit2" value="修改数量" /></td><td colspan="3" align="center" valign="middle">&nbsp;</td></tr><tr><td colspan="6" align="center" valign="middle">&nbsp;</td></tr></table></form><tr><td height="20" colspan="2" align="left" valign="middle">您共选择了价值￥<font color=red><%=sbo.getTotalPrice() %></font>的商品，点击<a href="index.jsp">此处</a>继续购物。</td><td height="20" colspan="4" align="right" valign="middle"><img src="data:images/logo25.jpg" width="85" height="30" /></td></tr></table></td></tr><tr><td align="center"><jsp:include flush="true" page="tail.jsp"></jsp:include></td></tr>
</table>
</center></body>
</html>

ConnDB.java

package com.tingwei.model;
import java.sql.*;
public class ConnDB {private Connection ct=null;public Connection getConn(){try {Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");String url="jdbc:microsoft:sqlserver://127.0.0.1:1433;databaseName=testdb";String user="sa";String pass="tingwei";ct=DriverManager.getConnection(url,user,pass);} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}return ct;}
}

GoodsBean.java

package com.tingwei.model;public class GoodsBean {private long goodsId;private String goodsName;private String goodsIntro;private float goodsPrice;private int goodsNum;private String publisher;private String photo;private String type;public long getGoodsId() {return goodsId;}public void setGoodsId(long goodsId) {this.goodsId = goodsId;}public String getGoodsIntro() {return goodsIntro;}public void setGoodsIntro(String goodsIntro) {this.goodsIntro = goodsIntro;}public String getGoodsName() {return goodsName;}public void setGoodsName(String goodsName) {this.goodsName = goodsName;}public float getGoodsPrice() {return goodsPrice;}public void setGoodsPrice(float goodsPrice) {this.goodsPrice = goodsPrice;}public String getPhoto() {return photo;}public void setPhoto(String photo) {this.photo = photo;}public String getPublisher() {return publisher;}public void setPublisher(String publisher) {this.publisher = publisher;}public String getType() {return type;}public void setType(String type) {this.type = type;}public int getGoodsNum() {return goodsNum;}public void setGoodsNum(int goodsNum) {this.goodsNum = goodsNum;}
}

GoodsBeanBO.java

//处理与goods表相关的操作
package com.tingwei.model;
import java.sql.*;
import java.util.ArrayList;
public class GoodsBeanBO {private ResultSet rs=null;private Connection ct=null;private PreparedStatement ps=null;//根据商品id显示商品信息的方法public GoodsBean getGoodsBean(String id){GoodsBean gb=new GoodsBean();try {ct=new ConnDB().getConn();ps=ct.prepareStatement("select * from goods where goodsId=?");ps.setString(1, id);//没看到很麻烦rs=ps.executeQuery();if(rs.next()){gb.setGoodsId(rs.getInt(1));gb.setGoodsName(rs.getString(2));gb.setGoodsIntro(rs.getString(3));gb.setGoodsPrice(rs.getFloat(4));gb.setGoodsNum(rs.getInt(5));gb.setPublisher(rs.getString(6));gb.setPhoto(rs.getString(7));gb.setType(rs.getString(8));}} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{//关闭资源this.close();}return gb;}/** 分页显示货物信息* @parameter int pageSize;每页显示记录数* @author someone* @parameter int pageNow 显示第几页* ctrl+shift+m自动引包*/public ArrayList getGoodsByPage(int pageSize,int pageNow){ArrayList al=new ArrayList();try {ct=new ConnDB().getConn();ps=ct.prepareStatement("select top "+pageSize+" * from goods where goodsId not in (select top "+(pageNow-1)*pageSize+" goodsId from goods)");rs=ps.executeQuery();while(rs.next()){GoodsBean gb=new GoodsBean();gb.setGoodsId(rs.getInt(1));gb.setGoodsName(rs.getString(2));gb.setGoodsIntro(rs.getString(3));gb.setGoodsPrice(rs.getFloat(4));gb.setGoodsNum(rs.getInt(5));gb.setPublisher(rs.getString(6));gb.setPhoto(rs.getString(7));gb.setType(rs.getString(8));al.add(gb); //very important,don't forget }} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{this.close();}return al;}//得到总共有多少页public int getPageCount(int pageSize){int pageCount=0;int rowCount=0;try {ct=new ConnDB().getConn();ps=ct.prepareStatement("select count(*) from goods");rs=ps.executeQuery();if(rs.next()){rowCount=rs.getInt(1);if(rowCount%pageSize==0){pageCount=rowCount/pageSize;}else{pageCount=rowCount/pageSize+1;}}} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}return pageCount;}//关闭数据库方法public void close(){try {if(rs!=null)rs.close();if(ps!=null)ps.close();if(ct!=null)ct.close();} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}
}

ShoppingBO.java

//处理与购物有关的逻辑
//添加商品、删除商品、清空商品、修改货物数量、显示已选商品清单
package com.tingwei.model;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.Iterator;
public class ShoppingBO {private float totalPrice=0;//购物车商品总价private ResultSet rs=null;private Connection ct=null;private PreparedStatement ps=null;HashMap <String,String>hm=new HashMap<String,String>();//泛型，明确告诉编译器key值和value值都是String类型的//添加商品public void addGoods(String goodsId,String goodsNum){hm.put(goodsId,goodsNum);}//删除商品public void delGoods(String goodsId){hm.remove(goodsId);}//清空商品public void clearGoods(){hm.clear();}//修改货物数量public void updateGoods(String goodsId,String newNum){hm.put(goodsId, newNum);}//显示已选商品清单public ArrayList showMyCar(){ArrayList <GoodsBean>al=new ArrayList<GoodsBean>();//明确告诉编译器，ArrayList放的是GoodsBeantry {String sub="";String sql="select * from goods where goodsId in";//使用迭代器，完成从HashMap中取出货物idIterator it=hm.keySet().iterator();sub="(";while(it.hasNext()){//取出goodsIdString goodsId=(String)it.next();//判断goodsId是否是最后一个idif(it.hasNext()){sub+=goodsId+",";}else{sub+=goodsId+")";}}sql+=sub;//不可少System.out.println("执行的sql语句"+sql);ct=new ConnDB().getConn();ps=ct.prepareStatement(sql);rs=ps.executeQuery();//总价清空this.totalPrice=0;while(rs.next()){GoodsBean gb=new GoodsBean();int goodsId=rs.getInt(1);gb.setGoodsId(goodsId);gb.setGoodsName(rs.getString(2));gb.setGoodsIntro(rs.getString(3));gb.setGoodsPrice(rs.getFloat(4));float unit=rs.getFloat(4);gb.setGoodsNum(rs.getInt(5));gb.setPublisher(rs.getString(6));gb.setPhoto(rs.getString(7));gb.setType(rs.getString(8));this.totalPrice+=unit*Integer.parseInt(this.getGoodsNumById(goodsId+""));al.add(gb);}} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{this.close();}return al;}/** 根据商品id得到商品顾客选择的商品数量* @param goodsId* @return 商品数量*/public String getGoodsNumById(String goodsId){return (String)hm.get(goodsId);}//返回购物车总价的方法,不必单独写，可以在showMyCar中使用现成的数据来计算public float getTotalPrice(){return this.totalPrice;}//  关闭数据库方法public void close(){try {if(rs!=null)rs.close();if(ps!=null)ps.close();if(ct!=null)ct.close();} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}
}

//用于演示HashMap的用法，在此项目中不需要此文件
package com.tingwei.model;
import java.util.*;
public class TestHashMap {public static void main(String []args){HashMap hm=new HashMap();hm.put("1", "3");hm.put("2", "4");hm.put("5", "100");//删除"2"hm.remove("2");//取出所有key//使用迭代器Iterator it=hm.keySet().iterator();while(it.hasNext()){//取出keyString key=(String)it.next();System.out.println("key=="+key);//根据key取出valueString nums=(String)hm.get(key);System.out.println("nums=="+nums);}}}

ShowGoodsClServlet.java

package com.tingwei.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 com.tingwei.model.*;
public class ShowGoodsClServlet extends HttpServlet {/*** 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");response.setCharacterEncoding("utf-8");//设置编码别放错位置PrintWriter out = response.getWriter();//判断需要控制的类型String type=request.getParameter("type");if(type.equals("showItem")){//          得到要显示的商品idString goodsId=request.getParameter("id");//调用BOGoodsBeanBO gbb=new GoodsBeanBO();GoodsBean gb=gbb.getGoodsBean(goodsId);//把gb放入requestrequest.setAttribute("goodsInfo",gb);request.getRequestDispatcher("showItem.jsp").forward(request, response);}else if(type.equals("fenye")){String pageNow=request.getParameter("pageNow");//把pageNow放入requestrequest.setAttribute("pageNow", pageNow);//跳转回购物大厅request.getRequestDispatcher("index.jsp").forward(request, response);}}/*** 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 {this.doGet(request, response);}}

ShoppingClServlet.java

package com.tingwei.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 com.tingwei.model.*;
import java.util.ArrayList;
public class ShoppingClServlet extends HttpServlet {/*** 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");response.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();//得带type值，从而知道顾客需要的购物操作String type=request.getParameter("type");
//      调用ShoppingBO，完成购物功能,??这里有问题，会造成有多个购物车，必须保证始终只有一个购物车，解决办法采用session//1.先试图从session中取出一个购物车ShoppingBO sbo=(ShoppingBO)request.getSession().getAttribute("mycar");if(sbo==null){//创建一个购物车，并放入sessionsbo=new ShoppingBO();request.getSession().setAttribute("mycar", sbo);}if(type.equals("addGoods")){//          获得要购买的商品idString goodsId=request.getParameter("goodsId");sbo.addGoods(goodsId, "1");}else if(type.equals("delGoods")){//得到要删除的商品idString goodsId=request.getParameter("goodsId");//从购物车中删除sbo.delGoods(goodsId);}else if(type.equals("show")){//do nothing}else if(type.equals("delAll")){sbo.clearGoods();}else if(type.equals("updateGoods")){//接收商品idString goodsId[]=request.getParameterValues("goodsId");String newNums[]=request.getParameterValues("newNums");for(int i=0;i<goodsId.length;i++){//测试是否得到System.out.println("id=="+goodsId[i]+"数量="+newNums[i]);sbo.updateGoods(goodsId[i], newNums[i]);}//sbo.updateGoods(goodsId, newNum)}
//      把购物车的商品信息取出来，准备显示ArrayList al=sbo.showMyCar();//放入request中request.setAttribute("myCarInfo", al);//跳转到showShoppingCar.jsprequest.getRequestDispatcher("showShoppingCar.jsp").forward(request, response);}/*** 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 {this.doGet(request, response);}}

WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>ShowGoodsClServlet</servlet-name><servlet-class>com.tingwei.servlet.ShowGoodsClServlet</servlet-class></servlet><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>ShoppingClServlet</servlet-name><servlet-class>com.tingwei.servlet.ShoppingClServlet</servlet-class></servlet><servlet-mapping><servlet-name>ShowGoodsClServlet</servlet-name><url-pattern>/ShowGoodsClServlet</url-pattern></servlet-mapping><servlet-mapping><servlet-name>ShoppingClServlet</servlet-name><url-pattern>/ShoppingClServlet</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list>
</web-app>

mycss/Untitled-3.css

.abc {font-family: "新宋体";font-size: 9px;
}.navi {font-family: "新宋体";font-size: 12px;background-color: #33FF00;
}

运行结果：

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