src/edu/school/servlet/StudentServlet.java

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package edu.school.servlet;

import edu.school.entity.*;
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 edu.school.utils.WebUtils;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

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



public class StudentServlet extends BaseServlet {
    private StudentService service=new StudentServiceImpl();
    private TeacherService teacherService=new TeacherServiceImpl();
    private InstructorService instructorService=new InstructorServiceImpl();

    private AdminService adminService=new AdminServiceImpl();
		
	//添加学生信息
    protected void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//添加
        String stuno=request.getParameter("stuno");
        String realname=request.getParameter("realname");
        String pwd=request.getParameter("pwd");
        Date nowtime=new Date();
        if(service.existsStuno(stuno)){
            request.setAttribute("msg","该学号已存在");
            request.setAttribute("stuno",stuno);
            request.setAttribute("realname",realname);
            request.setAttribute("pwd",pwd);
            request.getRequestDispatcher("/WEB-INF/student/edit_student.jsp").forward(request,response);//返回到登陆界面
        }else {
            try {
                SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd");
                String createDate=simpleDateFormat.format(nowtime);
                System.out.println("已到达"+createDate);
                service.addStudent(new Student(null,stuno,realname,pwd,createDate));
            }catch(Exception e) {};
            response.sendRedirect(request.getContextPath()+"/StudentServlet?action=list");//重定向防止重复提交哦

        }
    }
    //注册
    protected void registe(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//添加
        String stuno=request.getParameter("stuno");
        String realname=request.getParameter("realname");
        String pwd=request.getParameter("pwd");
        String type=request.getParameter("type");