bookcarmodify.java

网上购书系统

package action;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import datamanage.po.PoBook;


public class BookCarModify extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        int BookId=Integer.parseInt(request.getParameter("BookId"));
//        String BookName=request.getParameter("BookName");
//        String BookAuthor=request.getParameter("BookAuthor");
//        String BookPublish=request.getParameter("BookPublish");
//        String BookPubDate=request.getParameter("BookPubDate");
//        Float BookPrice=Float.parseFloat(request.getParameter("BookPrice"));
//        int BookNum=Integer.parseInt(request.getParameter("BookNum"));
        int SelectNum=Integer.parseInt(request.getParameter("SelectNum"));

//        PoBook pb=new PoBook();

//        pb.setBookId(BookId);
//        pb.setBookName(BookName);
//        pb.setBookAuthor(BookAuthor);
//        pb.setBookPublish(BookPublish);
//        pb.setBookPubDate(BookPubDate);
//        pb.setBookPrice(BookPrice);
//        pb.setSelectNum(SelectNum);

        List list = (List) request.getSession().getAttribute("list");
        for (int i = 0; i < list.size(); i++) {
            PoBook op = (PoBook) list.get(i);
            if (op.getBookId() == BookId) {
                op.setSelectNum(SelectNum);
            }
        }

        request.getSession().setAttribute("list", list);

        float totalprice=0;
        for (int i = 0; i < list.size(); i++) {
            PoBook op = (PoBook) list.get(i);

            totalprice=totalprice+(op.getBookPrice()*op.getSelectNum());
        }
        request.getSession().setAttribute("totalprice", totalprice);
        response.sendRedirect("BookCarList.jsp");
    }
    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }
}