login.java

简单的餐厅管理系统

package controller;

import beans.User;

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

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 Login extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public Login() {
		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 {
		
		request.setCharacterEncoding("GBK");
		String userName,realName,password;
		userName = request.getParameter("username");
//		System.out.println(userName);
		password = request.getParameter("password");
		HttpSession mySession = request.getSession(true);
		
		if(userName ==null || userName.equals("")){
			mySession.setAttribute("errorMsg","没有输入正确用户名");
			response.sendRedirect("../left.jsp");
			return;
		}
		
		if(password ==null || password.equals("")){
			mySession.setAttribute("errorMsg","没有输入正确密码");
			response.sendRedirect("../left.jsp");
			return;
		}
		
		//mySession.removeAttribute("errorMsg");
	
		User temp = new User();
		String errorMsg = temp.getData(userName, password);
		mySession.setAttribute("username", userName);
		if(errorMsg == null){
//			mySession.setAttribute("errorMsg", errorMsg);
//			mySession.setAttribute("errorMsg",temp.getRealName());
			mySession.setAttribute("realname",temp.getRealName());
			mySession.setAttribute("type", Integer.valueOf(temp.getType()));
			response.sendRedirect("../left.jsp");
		}else{
				mySession.setAttribute("errorMsg",errorMsg);
				response.sendRedirect("../left.jsp");
		}
		
//		response.sendRedirect("../login.jsp");
		//
				//
	}

	/**
	 * 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
	}

}