bookcardelete.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 BookCarDelete 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"));

        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) {
                list.remove(i);

            }
        }

        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() {
    }
}