mainbilldo.java

简单的餐厅管理系统

package controller.bill;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
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.Bill;
import beans.Order;
import beans.User;

public class MainBillDo extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public MainBillDo() {
		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());
		}
		if(type != 2){
			//跳转至主页面
			mySession.setAttribute("errorMsg", "只能服务员能够操作点菜单");
			RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
			rd.forward(request, response);
			return;
		}
		String action = request.getParameter("action");
		if(action == null){
			mySession.setAttribute("errorMsg", "不正确的操作");
			RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
			rd.forward(request, response);
			return;
		}else{
			if(action.equals("queryBill")){
				//执行查询方法
				doQueryBill(request,response);
				return;
			}
			if(action.equals("addBill")){
				doAddBill(request,response);
				return;
			}
			if(action.equals("modifyBill")){
				doModifyBill(request,response);
				return;
			}
		}
		mySession.setAttribute("errorMsg", "错误操作");
		RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
		rd.forward(request, response);
	}

	private void doModifyBill(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		HttpSession mySession = request.getSession();
		if(validateOperation("不能执行新的点菜单修改",request,response)){
			//跳转至填写修改页面一项
			RequestDispatcher rd = getServletContext().getRequestDispatcher("/waiter/bill/modifyBillShow.jsp");
			rd.forward(request, response);
			return;
		}
	}

	private void doAddBill(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		HttpSession mySession = request.getSession();
		if(validateOperation("不能执行新的点菜单增加",request,response)){
			Hashtable billInfor = new Hashtable();
			billInfor.put("action", "new");
			Bill billItem = new Bill();
			billItem.setBeginTime(new Date());
			String userName = (String)mySession.getAttribute("username");
			User waiter = new User();
			waiter.getWaiterData(userName);
			billItem.setWaiter(waiter);
			billItem.setType(1);
			mySession.setAttribute("billInfor", billInfor);
			
			//跳转至添加页面一项
			RequestDispatcher rd = getServletContext().getRequestDispatcher("/waiter/bill/addBill.jsp");
			rd.forward(request, response);
			return;
		}
		
	}

	private void doQueryBill(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		RequestDispatcher rd = getServletContext().getRequestDispatcher("/waiter/bill/queryBillShow.jsp");
		rd.forward(request, response);
		return;
	}
	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
	}

}