selectbookaction.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 SelectBookAction 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"));
        String bookPath=request.getParameter("BookPath");

        PoBook pb=new PoBook();

        pb.setBookId(bookid);
        pb.setBookName(bookname);
        pb.setBookAuthor(bookauthor);
        pb.setBookPublish(bookpublish);
        pb.setBookPubDate(bookpubdate);
        pb.setBookPrice(bookprice);
        pb.setBookPath(bookPath);
        pb.setSelectNum(1);

        List list = (List) request.getSession().getAttribute("list");

        if (list == null) {
            list = new ArrayList();
        }
        boolean flag = false;

        for (int i = 0; i < list.size(); i++) {
            PoBook op = (PoBook) list.get(i);
            System.out.println("列表中有的书ID是" + op.getBookId());
            System.out.println("你点的书ID是" + pb.getBookId());
            if (op.getBookId() == pb.getBookId()) {
                op.setSelectNum(op.getSelectNum() + 1);
                flag = true;
            }
        }
        if (flag == false) {
            list.add(pb);
            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() {
    }
}