JSP+Servlet实现简单购物车功能.doc

JSP+Servlet实现简单购物车功能1、 配置web.xml文件，将用到的Servlet添加到文件中。具体配置如下： Cart3Servlet cart.Cart3Servlet Cart3Servlet /servlet/Cart3Servlet eshop.jsp 2、 相应的页面A 显示购买页书名作者单价(RMB)数量form action=/servlet/Cart3Servlet method=post class=subinput type=hidden name=delindex value= /form action=/servlet/Cart3ServletB 显示商品页Servlet 实现购物车-购买Servlet实现购物车-购买form action=/servlet/Cart3Servlet method=post书目：eclipse开发工具介绍/刘鹏/20.6Tomcat工作原理/周慧/15.5Struts2.0开发详解/张晓华/20.5JSP应用开发/张建/30.9ORCALE数据库/Alax/19.4数量：C 结算页面Servlet实现购物车-结算Servlet实现购物车-结算书名作者单价(RMB)数量总价：form action=/cart3/eshop3.jsp class=sub method=post3、 相应的Servlet类的编写package cart;import java.io.IOException;import java.util.Vector;import javax.servlet.RequestDispatcher;import javax.servlet.ServletContext;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 shopping.Book;public class Cart3Servlet extends HttpServlet /* * */private static final long serialVersionUID = 1L;SuppressWarnings(unchecked)public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException/统一编码response.setContentType(text/html, charset=UTF-8);request.setCharacterEncoding(UTF-8);/获取sessionHttpSession session = request.getSession();if(session = null)response.sendRedirect(request.getContextPath()+/web/error.html);Vector list3 = (Vector) session.getAttribute(list3);String action = request.getParameter(action);/判断是否为结算/不是if(!checkout.equals(action)/添加图书boolean bl = false; /用来判断在session中list不为null的情况下 list中是否存在该图书信息的情况if(add.equals(action)Book book = this.getBook(request);if(list3 = null) /session中没有该信息时，创建一新的 直接添加list3 = new Vector();list3.addElement(book);else/list3不为null，并且其中有该图书的信息，则直接更新数量即可for(int i=0; ilist3.size(); i+)Book tb = list3.elementAt(i);if(tb.getName().equals(book.getName()tb.setQuantity(tb.getQuantity()+book.getQuantity();list3.setElementAt(tb, i);bl = true;/list3不为 null 并且其中没有该图书的信息，直接添加即可if(!bl)list3.addElement(book);/删除else if(del.equals(action)String di = request.getParameter(delindex);int index = Integer.parseInt(di);list3.removeElementAt(index);/更新session.setAttribute(list3, list3);String url = /cart3/eshop3.jsp;ServletContext sc = this.getServletContext();RequestDispatcher rd = sc.getRequestDispatcher(url);rd.forward(request, response);/是结算的情况 else if(checkout.equals(action)float sum = 0;for(int i=0; ilist3.size(); i+)Book b = list3.elementAt(i);sum += b.getPrice() * b.getQuantity();String amount = new Float(sum).toString();session.setAttribute(amount3, amount);String url = /cart3/chout3.jsp;ServletContext sc = this.getServletContext();RequestDispatcher rd = sc.getRequestDispatcher(url);rd.forward(request, response);private Book getBook(HttpServletRequest request)Book book = new Book();String temp = request.getParameter(book);String t = temp.split(/);String artist = t0;String name = t1;String price = t2;String sl = request.getParameter(sl);book.setArtist(artist);book.setName(name);book.setPrice(Float.parseFloat(price);book.setQuantity(Integer.parseInt(sl);return book;public void doGet(HttpServlet