src/edu/school/servlet/LoginServlet.java

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package edu.school.servlet;

import edu.school.entity.Admin;
import edu.school.entity.Instructor;
import edu.school.entity.Student;
import edu.school.entity.Teacher;
import edu.school.service.AdminService;

import edu.school.service.InstructorService;
import edu.school.service.StudentService;
import edu.school.service.TeacherService;
import edu.school.service.impl.AdminServiceImpl;
import edu.school.service.impl.InstructorServiceImpl;
import edu.school.service.impl.StudentServiceImpl;
import edu.school.service.impl.TeacherServiceImpl;


import java.io.IOException;

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



/**
 * 处理登录得请求
 */
public class LoginServlet extends BaseServlet {
	private static final long serialVersionUID = 1L;
	private StudentService service=  new StudentServiceImpl();
	private AdminService as=new AdminServiceImpl();
	private TeacherService teacherService=new TeacherServiceImpl();
	private InstructorService instructorService=new InstructorServiceImpl();
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    //登录操作
    protected void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//处理登录
        String username = request.getParameter("username").trim();//接收学号/工号
        String pwd = request.getParameter("pwd").trim();
        int type=Integer.parseInt(request.getParameter("type").trim());
	       switch (type) {
	       case 1:
				   Student student=service.login(username,pwd);
				   System.out.println(username+pwd+"type=1"+student);
				   if(student==null){
					   request.setAttribute("msg","学号不存在或者密码错误"); //绑定参数
					   request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request,response);
				   }else {
					   request.getSession().setAttribute("student", student);
					   request.getSession().setAttribute("type", 1);
					   request.getRequestDispatcher("/WEB-INF/views/main.jsp").forward(request,response);
				   }