querybilldo.java

简单的餐厅管理系统

package controller.bill;

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

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 util.DealOrder;
import util.DealBill;

import beans.Bill;
import beans.Order;

public class QueryBillDo extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public QueryBillDo() {
		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");
		request.setCharacterEncoding("GBK");
		
		HttpSession mySession = request.getSession();
		int type = 0;
		if(mySession.getAttribute("type")!= null){
			type = Integer.parseInt(mySession.getAttribute("type").toString());
		}

		
		String action = request.getParameter("action");
		if(action == null){
			//没有给出主要信息，跳转至主页
			mySession.setAttribute("errorMsg", "错误操作");
			RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
			rd.forward(request, response);
			return;
		}else{
			if(type != 2){
				//跳转至主页面
				mySession.setAttribute("errorMsg", "只能服务员能够查询点菜单,请登录服务员");
				RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
				rd.forward(request, response);
				return;
			}
			if(action.equals("queryOneBill")){
				doQueryOneBill(request,response);
				return;
			}
			if(action.equals("queryAllBill")){
				
				doQueryAllBill(request,response);
				return;
			}
		}
		//跳转到主页面
		mySession.setAttribute("errorMsg", "错误操作");
		RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
		rd.forward(request, response);
	}

	private void doQueryAllBill(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		HttpSession mySession = request.getSession();
		DealBill totalBills = new DealBill();
		
		String errorMsg = totalBills.generateBills();
		//设置request属性
		mySession.setAttribute("errorMsg", errorMsg);
		Vector temp = totalBills.getBills();
		request.setAttribute("allbill", temp);
		
		//跳转至显示所有的bill的页面
		RequestDispatcher rd = getServletContext().getRequestDispatcher("/waiter/bill/showBills.jsp");
		rd.forward(request, response);
		return;
	}

	private void doQueryOneBill(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		HttpSession mySession = request.getSession();
		Hashtable billInfor = (Hashtable)mySession.getAttribute("billInfor");
		if(validateOperation("不能执行新的查询点菜单",request,response)){
			String billID = request.getParameter("billID");
			if(billID == null){
				mySession.setAttribute("errorMsg", "请输入正确的ID名");
				//跳转至次查询页面
				RequestDispatcher rd = getServletContext().getRequestDispatcher("/waiter/bill/queryBillShow.jsp");
				rd.forward(request, response);
				return;
			}
			
			Bill temp = new Bill();
			String errorMsg = temp.getData(billID);
			mySession.setAttribute("errorMsg", errorMsg);
			
			//设置billInfor
			billInfor = new Hashtable();
			billInfor.put("action", "ok");
			billInfor.put("bill", temp);
			
			if(temp.getType() == 2){
				billInfor.put("action", "checked");
			}
			mySession.setAttribute("billInfor", billInfor);
			
			
			//跳转至显示订单信息页面
			RequestDispatcher rd = getServletContext().getRequestDispatcher("/waiter/bill/billResult.jsp");
			rd.forward(request, response);
			return;
		}
	}

	
	//判断能不能执行操作
	private boolean validateOperation(String show,HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{
		HttpSession mySession = request.getSession();
		Hashtable billInfor = (Hashtable)mySession.getAttribute("billInfor");
		if(billInfor != null){
			String action = (String)billInfor.get("action");
			if(action!=null){
				if(action.equals("modify")){
					mySession.setAttribute("errorMsg",show+", 请完成这个点菜单的填写");
					//跳转至修改订单的信息一栏
					RequestDispatcher rd = getServletContext().getRequestDispatcher("/waiter/bill/modifybill.jsp");
					rd.forward(request, response);
					return false;
				}
	
			}
		}
		return true;
	}
	/**
	 * 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
	}

}