《Java Web开发之道》书中源码

package com.servlet; import java.io.IOException; import java.sql.SQLException; import java.util.Arrays; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.dao.GoodsDao; import com.dao.OrderformDao; import com.dao.ShopcarDao; import com.dao.TempDao; import com.toolsbean.StringHandler; import com.valuebean.OrderformBean; import com.valuebean.ShopcarBean; import com.valuebean.UserBean; public class ShopcarServlet 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 servletpath=request.getServletPath(); if("/buy".equals(servletpath)) buy(request,response); else if("/showshopcar".equals(servletpath)) showshopcar(request,response); else if("/remove".equals(servletpath)) remove(request,response); else if("/clearshopcar".equals(servletpath)) clear(request,response); else if("/submitshopcar".equals(servletpath)) submitDispatcher(request,response); else if("/createorderform".equals(servletpath)) createorderform(request,response); } /** @功能：购买商品 */ protected void buy(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { String message=""; Integer buygoodsid=StringHandler.strToint(request.getParameter("buygoodsId")); if(buygoodsid==null){ message="<li>商品ID值错误！</li>"; message+="<a href='window.history.go(-1)'>返回</a>"; } else{ try { Date now=new Date(); //获取当前时间 TempDao tempDao=new TempDao(); String shopcarid=seeshopcarcookie(request,response); //查询客户端Cookie中是否保存了一个购物车ID值 if(shopcarid==null||shopcarid.equals("")||!tempDao.isexist(shopcarid)){ //没有保存 shopcarid=addshopcarcookie(request,response,now); //生成一个购物车ID保存到客户端Cookie中，并返回该ID值 tempDao.saveShopcarCreateTime(shopcarid, StringHandler.timeTostr(now)); //记录该购物车ID和创建时间到数据表中 } int i=-1; ShopcarDao shopcarDao=new ShopcarDao(); Object[] params={shopcarid,buygoodsid}; if(shopcarDao.isBuy(params)) //如果已经购买了该商品 i=shopcarDao.addBuyNum(params); //更新商品购买数量 else{ //没有购买该商品 params=new Object[]{shopcarid,buygoodsid,1}; i=shopcarDao.addBuyGoods(params); //添加该商品到购物车(tb_shopcar数据表)中 } shopcarDao.closed(); if(i<=0) message="<li>添加商品到购物车失败！</li><br>"; else message="<li>添加商品到购物车成功！</li><br>"; message+="<a href='javascript:window.history.go(-1)'>返回</a>"; message+="&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"; message+="<a href='showshopcar'>查看购物车<a/>"; } catch (SQLException e) { e.printStackTrace(); } } request.setAttribute("message",message); RequestDispatcher rd=request.getRequestDispatcher("/message.jsp"); rd.forward(request,response); } private String seeshopcarcookie(HttpServletRequest request,HttpServletResponse response){ String webname=request.getContextPath(); webname=webname.substring(1); Cookie[] coks=request.getCookies(); String shopcarid=""; int i=0; for(;i<coks.length;i++){ Cookie icok=coks[i]; if(icok.getName().equals(webname+".usershopcar")){ shopcarid=icok.getValue(); break; } } return shopcarid; } private String addshopcarcookie(HttpServletRequest request,HttpServletResponse response,Date date){ String webname=request.getContextPath(); webname=webname.substring(1); String shopcarid="car"+StringHandler.getSerial(date); Cookie shopcar=new Cookie(webname+".usershopcar",shopcarid); shopcar.setPath("/"); int maxage=60*60*24*3; //设置cookie的有效期为3天 shopcar.setMaxAge(maxage); response.addCookie(shopcar); return shopcarid; } protected void showshopcar(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { String shopcarid=seeshopcarcookie(request,response); if(shopcarid!=null&&!shopcarid.equals("")){ ShopcarBean shopcar=new ShopcarDao().getShopcar(shopcarid); request.setAttribute("shopcar",shopcar); } RequestDispatcher rd=request.getRequestDispatcher("/showShopcar.jsp"); rd.forward(request,response); } protected void remove(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { Integer goodsId=StringHandler.strToint(request.getParameter("goodsId")); String shopcarid=seeshopcarcookie(request,response); if(shopcarid!=null&&!shopcarid.equals("")&&goodsId!=null){ ShopcarDao shopcarDao=new ShopcarDao(); int i=shopcarDao.deleteGoods(shopcarid,goodsId); if(i<=0) request.setAttribute("message","●删除商品失败！"); else request.setAttribute("message","●删除商品成功！"); shopcarDao.closed(); } showshopcar(request,response); } protected void clear(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { String shopcarid=seeshopcarcookie(request,response); if(shopcarid!=null&&!shopcarid.equals("")){ ShopcarDao shopcarDao=new ShopcarDao(); int i=shopcarDao.clearShopcar(shopcarid); if(i<=0) request.setAttribute("message","●清空购物车失败！"); else request.setAttribute("message","●清空购物车成功！"); shopcarDao.closed(); } RequestDispatcher rd=request.getRequestDispatcher("/showShopcar.jsp"); rd.forward(request,response); } protected void submitDispatcher(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException { String whichsubmit=request.getParameter("whichsubmit"); if(whichsubmit==null) payforMoney(request,response); else updatebuyNum(request,response); } private void payforMoney(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException { if(shopcar_validateBuyNum(request, response)){ String buygoodsids=StringHandler.ArrayToString(request.getParameterValues("buygoodsids")); String buygoodsnum=StringHandler.ArrayToString(request.getParameterValues("buygoodsnum")); request.setAttribute("buygoodsids", buygoodsids); request.setAttribute("buygoodsnum", buygoodsnum); RequestDispatcher rd=request.getRequestDispatcher("/fillOrderform.jsp"); rd.forward(request,response); } else showshopcar(request,response); } protected void updatebuyNum(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException { shopcar_validateBuyNum(request, response); showshopcar(request,response); } private boolean shopcar_validateBuyNum(HttpServletRequest request,HttpServletResponse response){ boolean mark=true; String[] goodsStoreNums=request.getParameterValues("buygoodsstorenum"); String[] buyNums=request.getParameterValues("buygoodsnum"); String[] goodsIds=request.getParameterValues("buygoodsids"); String shopcarid=seeshopcarcookie(request,response); if(goodsIds!=null&&goodsIds.length!=0&&shopcarid!=null){ Map messages=new HashMap(); Object[] params=new Object[3]; ShopcarDao shopcarDao=new ShopcarDao(); for(int i=0;i<goodsIds.length;i++){ int int_buyNum=Integer.parseInt(buyNums[i]); int int_goodsStoreNums=Integer.parseInt(goodsStoreNums[i]); if(int_buyNum>int_goodsStoreNums){ mark=false; messages.