addbasketcontroller.java

数据库exercise4作业,JSP

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

import estore.*;

/** 
* a servlet that takes input from ShowBooks.jsp
* and adds the selected book to a user's basket.
*
* @author A Jiayi
* @version 1.0
*/

public class AddBasketController extends HttpServlet {

	/**
	* Processes requests for HTTP <code>POST</code> methods.
	* @param request servlet request
	* @param response servlet response
	*/
	public void doPost(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {

		response.setContentType("text/html;charset=UTF-8");
		HttpSession session = request.getSession(true);
		EStoreBasket basket = (EStoreBasket)session.getAttribute("basket");

		if (basket == null) {
			basket = new EStoreBasket();
			session.setAttribute("basket", basket);
		}

		String[] isbns = request.getParameterValues("select");
		if (isbns != null) {
			for (int i = 0; i < isbns.length; i++) {
				basket.addItem(isbns[i]);
			}
		}
		session.setAttribute("basket", basket);
		response.sendRedirect("/E-Store/viewbasket.jsp");
	}
}