businessprocess.java

实现一个servlet、JSP部署

/*
 * Created on 2005-3-11
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package shopping;

import java.io.IOException;
import java.util.HashMap;

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

/**
 * @author Administrator
 * 
 * TODO To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Style - Code Templates
 */
public class BusinessProcess {
	public void processRequest(HttpServletRequest req, HttpServletResponse res,
			HashMap names, HashMap cards) throws ServletException, IOException {
		String page = req.getParameter("page");
		if (page != null) {
			if (page.equals("login")) {
				processLogin(req, res, names);
			} else if (page.equals("main")) {
				processMain(req, res);
			} else if (page.equals("detail")) {
				processDetail(req, res);
			} else if (page.equals("cardInsert")) {
				processCardInsert(req, res, cards);
			}
		} else {
			req.getRequestDispatcher("error.jsp").forward(req, res);
		}
	}

	/**
	 * @param req
	 * @param res
	 * @param cards
	 * @throws IOException
	 * @throws ServletException
	 */
	private void processCardInsert(HttpServletRequest req,
			HttpServletResponse res, HashMap cards) throws ServletException,
			IOException {
		if (req.getParameter("cardNo") != null
				&& !req.getParameter("cardNo").equals("")) {
			if (cards.containsKey(req.getParameter("cardNo"))) {
				String money = (String) cards.get(req.getParameter("cardNo"));
				if (Double.parseDouble(money)
						- Double.parseDouble(req.getParameter("total")) > 0) {
					req.getRequestDispatcher("shopEnd.jsp").forward(req, res);
				} else {
					System.out.println("You money is not enough!!!");
				}
			} else {
				System.out.println("The Card No. doesn't exist!!!");
			}
		}
	}

	/**
	 * @param req
	 * @param res
	 * @throws IOException
	 * @throws ServletException
	 */
	private void processDetail(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		System.out.println("processDetail");
		Cart cart = new Cart();
		cart.setTotal(req.getParameter("total"));
		req.setAttribute("cart", cart);
		req.getRequestDispatcher("cardNoInsert.jsp").forward(req, res);
	}

	/**
	 * @param req
	 * @param res
	 * @throws IOException
	 * @throws ServletException
	 */
	private void processMain(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		String[] sn = req.getParameterValues("sn");
		String[] name = req.getParameterValues("goodsName");
		String[] price = req.getParameterValues("goodsPrice");
		String[] number = req.getParameterValues("number");
		String[] goodsName = new String[sn.length];
		String[] goodsPrice = new String[sn.length];
		String[] goodsNumber = new String[sn.length];
		Cart cart = new Cart();
		if (sn != null) {
			for (int i = 0; i < sn.length; i++) {
				int tempsn = Integer.parseInt(sn[i]);
				goodsName[i] = name[tempsn - 1];
				goodsPrice[i] = price[tempsn - 1];
				goodsNumber[i] = number[tempsn - 1];
			}
			cart.setGoodsName(goodsName);
			cart.setGoodsPrice(goodsPrice);
			cart.setGoodsNumber(goodsNumber);
			cart.computeTotal();
			System.out.println(cart);
			req.setAttribute("cart", cart);
		}
		req.getRequestDispatcher("shoppingDetail.jsp").forward(req, res);
	}

	/**
	 * @param req
	 * @param res
	 * @param names
	 * @throws IOException
	 * @throws ServletException
	 */
	private void processLogin(HttpServletRequest req, HttpServletResponse res,
			HashMap names) throws ServletException, IOException {
		System.out.println("processLogin");
		if (req.getParameter("userid") != null
				&& !req.getParameter("userid").equals("")
				&& req.getParameter("password") != null
				&& !req.getParameter("password").equals("")) {
			if (names.containsKey(req.getParameter("userid").trim())
					&& names.containsValue(req.getParameter("password").trim())) {
				req.getRequestDispatcher("main.jsp").forward(req, res);
			} else {
				req.getRequestDispatcher("loginfailed.jsp").forward(req, res);
			}
		} else {
			req.getRequestDispatcher("loginfailed.jsp").forward(req, res);
		}

	}
}