做了两个JSP页面 一个JAVABEAN 一个SERVLET
一个ShoppingServlet
一个BookBean
是个简单的网络书店。。
又ShoppingServlet控制,里面有个删除书本的功能(红色字那部分),但是不行
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*; public class ShoppingServlet extends HttpServlet{
public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException{
HttpSession session=req.getSession();
Vector buyList=(Vector)session.getAttribute("shoppingcart");
String action=req.getParameter("action");
if(action.equals("ADD"))
{
boolean match=false;
String name=req.getParameter("name");
String quantity=req.getParameter("quantity");
String author=req.getParameter("author");
String publisher=req.getParameter("publisher");
String price=req.getParameter("price");
myBean.BookBean bk=new myBean.BookBean();
bk.setName(name);
bk.setAuthor(author);
bk.setPublisher(publisher);
bk.setPrice(Float.parseFloat(price));
bk.setQuantity(Integer.parseInt(quantity));
if(buyList==null)
{
buyList=new Vector();
buyList.addElement(bk);
}
else{
for(int i=0;i <buyList.size();i++)
{
myBean.BookBean book=(myBean.BookBean)buyList.elementAt(i);
if(book.getName().equals(bk.getName()))
{
book.setQuantity(book.getQuantity()+bk.getQuantity());
buyList.setElementAt(book,i);
match=true;
}
}
if(!match)
buyList.addElement(bk);
}
session.setAttribute("shoppingcart",buyList);
String url="/Shopping.jsp";
RequestDispatcher rd=req.getRequestDispatcher(url);
rd.forward(req,res);
}
else if(action.equals("CHECKOUT"))
{
float total=0;
for(int i=0;i <buyList.size();i++)
{
myBean.BookBean order=(myBean.BookBean)buyList.elementAt(i);
float price=order.getPrice();
int quantity=order.getQuantity();
total=total+(price*quantity);
}
session.setAttribute("amount",""+total);
String url="/Checkout.jsp";
RequestDispatcher rd=req.getRequestDispatcher(url);
rd.forward(req,res);
}
else if(action.equals("DELETE"))
{
String dname=req.getParameter("name");
for(int i=0;i <buyList.size();i++)
{
myBean.BookBean dorder=(myBean.BookBean)buyList.elementAt(i);
if(dorder.getName().equals(dname))
{
int id=dorder.indexOf();
buyList.removeElementAt(x);
}
}
session.setAttribute("shoppingcart",buyList);
String url="/Checkout.jsp";
RequestDispatcher rd=req.getRequestDispatcher(url);
rd.forward(req,res);
}
}
}
一个ShoppingServlet
一个BookBean
是个简单的网络书店。。
又ShoppingServlet控制,里面有个删除书本的功能(红色字那部分),但是不行
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*; public class ShoppingServlet extends HttpServlet{
public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException{
HttpSession session=req.getSession();
Vector buyList=(Vector)session.getAttribute("shoppingcart");
String action=req.getParameter("action");
if(action.equals("ADD"))
{
boolean match=false;
String name=req.getParameter("name");
String quantity=req.getParameter("quantity");
String author=req.getParameter("author");
String publisher=req.getParameter("publisher");
String price=req.getParameter("price");
myBean.BookBean bk=new myBean.BookBean();
bk.setName(name);
bk.setAuthor(author);
bk.setPublisher(publisher);
bk.setPrice(Float.parseFloat(price));
bk.setQuantity(Integer.parseInt(quantity));
if(buyList==null)
{
buyList=new Vector();
buyList.addElement(bk);
}
else{
for(int i=0;i <buyList.size();i++)
{
myBean.BookBean book=(myBean.BookBean)buyList.elementAt(i);
if(book.getName().equals(bk.getName()))
{
book.setQuantity(book.getQuantity()+bk.getQuantity());
buyList.setElementAt(book,i);
match=true;
}
}
if(!match)
buyList.addElement(bk);
}
session.setAttribute("shoppingcart",buyList);
String url="/Shopping.jsp";
RequestDispatcher rd=req.getRequestDispatcher(url);
rd.forward(req,res);
}
else if(action.equals("CHECKOUT"))
{
float total=0;
for(int i=0;i <buyList.size();i++)
{
myBean.BookBean order=(myBean.BookBean)buyList.elementAt(i);
float price=order.getPrice();
int quantity=order.getQuantity();
total=total+(price*quantity);
}
session.setAttribute("amount",""+total);
String url="/Checkout.jsp";
RequestDispatcher rd=req.getRequestDispatcher(url);
rd.forward(req,res);
}
else if(action.equals("DELETE"))
{
String dname=req.getParameter("name");
for(int i=0;i <buyList.size();i++)
{
myBean.BookBean dorder=(myBean.BookBean)buyList.elementAt(i);
if(dorder.getName().equals(dname))
{
int id=dorder.indexOf();
buyList.removeElementAt(x);
}
}
session.setAttribute("shoppingcart",buyList);
String url="/Checkout.jsp";
RequestDispatcher rd=req.getRequestDispatcher(url);
rd.forward(req,res);
}
}
}
楼主【soyen】截止到2008-07-27 19:22:53的历史汇总数据(不包括此帖):
发帖的总数量:6 发帖的总分数:100 每贴平均分数:16
回帖的总数量:6 得分贴总数量:0 回帖的得分率:0%
结贴的总数量:6 结贴的总分数:100
无满意结贴数:1 无满意结贴分:20
未结的帖子数:0 未结的总分数:0
结贴的百分比:100.00% 结分的百分比:100.00%
无满意结贴率:16.67 % 无满意结分率:20.00 %
敬礼!
假的话,在查出来以后,多给个成员变量(BOOLEAN型),进行更改
购物车的数据是一个Collection 中放多个javaBean ,在这个javaBean中就有这个要删除的ID,获的要删除的id,
遍历 这个Collection ,找出相同的ID,就从这个Collection中移去,在将这个Collection,
放入Session中去,就OK! 数据库中删除
这个太简单了,就是一个SQL 语句就能搞定.
{
String dname=req.getParameter("name");
for(int i=0;i<buyList.size();i++)
{
myBean.BookBean dorder=(myBean.BookBean)buyList.elementAt(i);
if(dorder.getName().equals(dname))
{
int id=buyList.indexOf(dorder);
buyList.removeElementAt(id);
}
}
session.setAttribute("shoppingcart",buyList);
String url="/Checkout.jsp";
RequestDispatcher rd=req.getRequestDispatcher(url);
rd.forward(req,res);
}
就是这段代码,我要用到VECTOR,我大概按照了5楼那位朋友的说法做了,但是就是没法实现这个功能。