changepassword.java

简单的餐厅管理系统

package controller;

import java.io.IOException;
import java.io.PrintWriter;

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.User;

public class ChangePassword extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public ChangePassword() {
		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");
		
		String action = request.getParameter("action");
		
		
			doChangeWaiterPassword(request,response);
			return;

	}

	private void doChangeWaiterPassword(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		HttpSession mySession = request.getSession();
		int type = 0;
		if(mySession.getAttribute("type")!=null){
			type =Integer.parseInt(mySession.getAttribute("type").toString());
		}
		if(type == 2){
			String username = (String)mySession.getAttribute("username");
			String password = (String)request.getParameter("oldPassword");
			if(password == null){
				password = "";
			}
			User change = new User();
			String errorMsg = change.getData(username, password);
			if(errorMsg == null){
				String newPassword = (String)request.getParameter("newPassword");
				change.setPassword(newPassword);
				String message = change.changePassword();
				
				if(message == null){
					mySession.setAttribute("errorMsg", "操作成功");
				}else{
					mySession.setAttribute("errorMsg", "数据库错误");
				}
				RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
				rd.forward(request, response);
				return;
			}
			
			mySession.setAttribute("errorMsg", "密码错误");
			response.sendRedirect("../waiter/changepassword.jsp");
			return;
		}
		mySession.setAttribute("errorMsg", "你不具有权限，请重新登陆");
		RequestDispatcher rd = getServletContext().getRequestDispatcher("/main.jsp");
		rd.forward(request, response);
		return;
	}

	/**
	 * 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
	}

}