servletsubmit.java

jsp实现的购物车功能

package jspcart.cart;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import jspcart.books.*;
import jspcart.conn.*;

public class servletSubmit 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();

    DBConnection db=new DBConnection();
    Book book=new Book();
    List l=new ArrayList();
    l=book.getBooks(db);
    Iterator it=l.iterator();

    String id[]=request.getParameterValues("flag");
    CartShopping carts=new CartShopping();//购物车

    for (int i = 0; i < id.length; i++) {
 //        Book book = ((Book[])getServletContext().getAttribute("it"))[i];
         Book b=(Book)it.next();

         int num = Integer.parseInt(request.getParameter("t" + id[i]));

         ItemBook item = new ItemBook(b,num);
         carts.additem(item);
       }
       request.getSession().setAttribute("cart",carts);
//    response.sendRedirect("showcart.jsp");
       request.getRequestDispatcher("CartShop.jsp").forward(request,response);
  }
  //Process the HTTP Post request
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    doGet(request, response);
  }
  //Clean up resources
  public void destroy() {
  }
}