src/servlet/LoginServlet.java

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package servlet;

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

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

import form.MessageForm;

import bean.Login;

public class LoginServlet extends HttpServlet {

	public static final String COOKIE_ID = "IDCOOKIE";
	public static final String COOKIE_PWD = "PWDCOOKIE";
	public static final String COOKIE_LOGO = "LOGOCOOKIE";
	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
		
		doGet(request,response);
	}
	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		
		String userName = "";
		String pwd = "";
		String temp = "";
		String number = "";
		String str = "";
		String type = "";
		Login login = new Login();
		RequestDispatcher rd = null;
		MessageForm messageForm = null;
		
		try{
			HttpSession session = request.getSession();
			
			request.setCharacterEncoding("GBK");	//中文转码
			response.setCharacterEncoding("GBK");

			str = request.getParameter("str");

			userName = request.getParameter("name");    //获得用户登录名
			pwd = request.getParameter("pwd"); 			//获得用户密码
			type = request.getParameter("type"); 		//获得登陆类型
			
			messageForm=login.getLogin(userName, pwd,type);//0,管理员，1学生，2教师
			
			if(messageForm != null){ //登陆成功

				session.setAttribute("login", messageForm.getLogo());	//用来判断是否通过登陆进入页面,及权限;//0,管理员，1学生，2教师