foodbill.java

酒店管理系统

package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import javabean.*;

import javax.servlet.ServletException;
import javax.servlet.http.*;
import database.*;

public class FoodBill extends HttpServlet {

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

	}

	/**
	 * 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 {
		PrintWriter out = response.getWriter();
		
		String foodID=request.getParameter("foodID");
		int foodNumber = Integer.parseInt(request.getParameter("foodNumber"));
		
		HttpSession session = request.getSession();
        DietBillTable dietBill = new DietBillTable();
        
        Customer customer = (Customer)session.getAttribute("customer");
        String identifierID = customer.getIdentifierID();
        
        if(foodID == ""){
			response.sendRedirect("/hotel/foodBill.jsp?errMsg=Please enter the foodID!");
		}
        
        try{
        	connectDB con = new connectDB();
        	String sql = "select * from diet where foodID = '" + foodID + "'";
        	con.excuteQuery(sql);
        	if(!con.next())
        		response.sendRedirect("/hotel/foodBill.jsp?errMsg=The foodID is not exist!");;
        }catch(Exception e){
        	e.printStackTrace();
        }
        if (session.getAttribute("dietBill")!=null) {
       	 dietBill = (DietBillTable)session.getAttribute("dietBill");
        }

	     if (foodNumber != 0) {
	    		 dietBill.addItem(foodID, foodNumber);
	    	 try
	    	 {
	    		 session.setAttribute("dietBill", dietBill);
	    		 response.sendRedirect("/hotel/foodBill.jsp");
	    	 }
	    	 catch (Exception e)
	    	 {
	    		 e.printStackTrace();
	    	 }
	     } else {
	    	 try{
	    		 response.sendRedirect("/hotel/foodBill.jsp?errMsg=Please enter the food number!");;
	    	 }catch(Exception e){
	    		 e.printStackTrace();
	    	 }
	     }
	}

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

}