updateorderitemservlet.java

servlet实现网上书店查询

package com.ghy.bookstore.order.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.ghy.bookstore.order.model.OrderItem;

public class UpdateOrderItemServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UpdateOrderItemServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		request.setCharacterEncoding("utf-8");
		HttpSession session = request.getSession();
		OrderItem orderitem = new OrderItem();
		ArrayList list = (ArrayList) session.getAttribute("ShopCart");
		if (list != null) {
			// 更新书购买的数量
			for (int i = 0; i < list.size(); i++) {
				String count = "count" + String.valueOf(i);
				String amount = request.getParameter(count);
				orderitem = (OrderItem) list.get(i);
				orderitem.setMount(Integer.parseInt(amount));

			}
			// 删除选项被选择,清除list中相应元素
			for (int i = 0; i < list.size(); i++) {
				orderitem = (OrderItem) list.get(i);
				String del = "delete" + String.valueOf(i);
				String bookid = request.getParameter(del);
				if (bookid != null)
					list.remove(i);

			}

		}
		session.setAttribute("ShopCart", list);
		response.sendRedirect(request.getContextPath()
				+ "/jsp/order/orderitems.jsp");
	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}