lowqueryorderdo.java

简单的餐厅管理系统

package controller.order;

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

import javax.servlet.RequestDispatcher;
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 beans.Order;

public class LowQueryOrderDo extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public LowQueryOrderDo() {
		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 {

		HttpSession mySession = request.getSession();
		String orderID = request.getParameter("orderID");
		if(orderID == null){
			mySession.setAttribute("errorMsg", "请输入正确的ID名");
			//跳转至次查询页面
			RequestDispatcher rd = getServletContext().getRequestDispatcher("../queryOrderShow.jsp");
			rd.forward(request, response);
			return;
		}
		
		Order temp = new Order();
		String errorMsg = temp.getData(orderID);
		mySession.setAttribute("errorMsg", errorMsg);
		
		if(errorMsg != null){
			mySession.setAttribute("errorMsg", errorMsg);
			response.sendRedirect("../queryOrder.jsp");
			return;
		}
		
		//设置orderInfor
		Hashtable orderInfor = new Hashtable();
		orderInfor.put("action", "ok");
		orderInfor.put("orderItem", temp);
		request.setAttribute("orderInfor", orderInfor);
		
		
		//跳转至显示订单信息页面
		RequestDispatcher rd = getServletContext().getRequestDispatcher("/queryOrderResult.jsp");
		rd.forward(request, response);
		return;
	}

	/**
	 * 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
	}

}