deletebookservlet.java

网上购书系统！jsp+servlet+jdbc实现！数据库sqlserver2

package myservlet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import beans.BookInfoBean;

public class DeletebookServlet 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 {
        request.setCharacterEncoding("GBK");
        String shu = new String(request.getParameter("id").getBytes(),"GB2312");

        response.setContentType(CONTENT_TYPE);

        HttpSession session = request.getSession();
        Object obj = session.getAttribute("book"); //获得用户选择的书
        ArrayList list = (ArrayList) obj;

        System.out.println(shu);

        BookInfoBean bean = new BookInfoBean();
        //从选购中删除客户不要的书

        for (int j = 0; j < list.size(); j++) { //内循环控制客户选的书名
            bean = (BookInfoBean) list.get(j);
            //删除客户不要的书
            if (bean.getNum().equals(shu)) {
                list.remove(bean);
                break;
            }
        }

        session.setAttribute("book", list);
        response.sendRedirect("shopcar.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() {
    }
}