withdraw.java

来自「用jsp＋servlet」· Java 代码 · 共 107 行

package server;



import java.io.IOException;

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

public class Withdraw extends HttpServlet {

	/**
	 * 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 {
		doPost(request, response);
	}

	/**
	 * 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 {
		DBConnection db = new DBConnection();
		HttpSession session = request.getSession();
		String accountnumber = session.getAttribute("accountnumber") + "";
		String pin = session.getAttribute("pin") + "";
		String amount = request.getParameter("negaamount");
		double temp = 0.0;
		try {
			temp = Double.parseDouble(amount);
			session.setAttribute("format", null);
			if (temp < 0) {
				session.setAttribute("format", "bad");
				response.sendRedirect("welcome.jsp");
			} else {
				session.setAttribute("format", null);
				double origin = 0.0;
				db.executeQuery("select * from atm where accountnumber="
						+ accountnumber + " and pin=" + pin);
				if (db.rs_next()) {
					origin = db.rs_getDouble("balanceamount");

				}
				db.rs_close();
				origin -= temp;
				db.execute("update atm set balanceamount =" + origin
						+ "where accountnumber=" + accountnumber + " and pin="
						+ pin);
				response.sendRedirect("welcome.jsp");
			}
		} catch (NumberFormatException e) {
			session.setAttribute("format", "bad");
			response.sendRedirect("welcome.jsp");
			// TODO: handle exception
		}
	}

	/**
	 * The doPut method of the servlet. <br>
	 * 
	 * This method is called when a HTTP put request is received.
	 * 
	 * @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 doPut(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// Put your code here
	}

}