Javaweb学生信息管理系统（Mysql+JSP+MVC+CSS）

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项目源码及数据库：

链接：https://pan.baidu.com/s/1ktUyxbOI9lljWr-HRTRIiQ?pwd=1024
提取码：1024

 

目录

一.项目介绍

二.运行效果

1.登录界面

2.主界面（点击学号修改学生信息）

3.增加学生界面

​编辑

三.项目目录结构

 四.代码展示

1.jsp及css代码

 ①登录界面代码（login.jsp）

②登录界面css（login.css）

③注册用户界面（register.jsp）

④注册用户界面css（index.css）

⑤修改密码界面（UpdateLoginID.jsp）

⑥注销用户界面（DeleteLoginID.jsp）

⑦登录成功主界面（index.jsp）

⑧登陆成功界面css（show.css）

⑨点击学号，修改学生信息界面（StudentInfo.jsp）

⑩增加学生信息（add.jsp）

⑪上传作业操作（UpAndDown.jsp）

2.三层架构

①表示层Servlet

②业务逻辑层Service

③数据访问层Dao

④通用的数据库操作（DBUtils.java）

3.JavaBean封装数据

①分页帮助类（Page.java）

②封装学生信息（Student.java）

4.项目所需jar包

五.数据库表格

①登录注册表格login

②学生信息表格student1

一.项目介绍

本系统主要实现对基于Javaweb学生信息管理系统所需的各项基本功能，能够对学生信息进行增删改查等功能，并可以实现用户注册、用户登陆等功能。

数据库：mysql

开发工具：Eclipse

开发环境：JDK+Tomcat

二.运行效果

1.登录界面

2.主界面（点击学号修改学生信息）

3.增加学生界面

三.项目目录结构

 四.代码展示

1.jsp及css代码

 ①登录界面代码（login.jsp）

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<link href="css/login.css" type="text/css" rel="stylesheet">
<meta charset="UTF-8">

<title>学生信息管理系统-登录界面</title>
</head>
<body>
	<form action="CheckLoginServlet" method="post">
		<div class="content">
			<div class="wrap">
				<div class="login-box">
					<div class="login-frame">
						<h2>
							用户登录 <a href="register.jsp"> 立即注册</a>
						</h2>
						<div class=item>
							<input type="text" name="UID" placeholder="用户名">
						</div>
						<div class=item>
							<input type="password" name="upwd" placeholder="密码">
						</div>
						<input type="submit" class="login-btn" value="登 录">
						<div class=item1>
							<a href="UpdateLoginPwd.jsp"> 修改密码</a> 
							<a	href="DeleteLoginID.jsp"> 注销用户</a>
						</div>
						<%
							String error = (String) request.getAttribute("error");
							String error0 = (String) request.getAttribute("error0");
							String error1 = (String) request.getAttribute("error1");
							String error2 = (String) request.getAttribute("error2");
							String error3 = (String) request.getAttribute("error3");
							String error4 = (String) request.getAttribute("error4");

							if (error != null) 
								if (error.equals("loginError")) 
									out.println("用户名或密码错误！登录失败！");
								 else if (error.equals("nologinError")) 
									response.sendRedirect("QueryStudentByPageServlet");
								
							

							if (error0 != null) 
								if (error0.equals("loginError")) 
									out.println("用户名或密码错误！修改失败！");
								 else if (error0.equals("nologinError")) 
									if (error1 != null) 
								if (error1.equals("noupdateError")) 
									out.println("密码修改成功！");
								
									
								
							
							if (error2 != null) 
								if (error2.equals("loginError")) 
									out.println("用户名或密码错误！注销失败！");
								 else if (error2.equals("nologinError")) 
									if (error3 != null) 
								if (error3.equals("nodeleteError")) 
									out.println("账户注销成功！");
								
									
								
							
							if (error4 != null) 
								if (error4.equals("noaddError")) 
									out.println("账户注册成功！");
								
							
							%>
						</div>
					</div>
				</div>
			</div>
	</form>

</body>



</html>

②登录界面css（login.css）

*margin:0;padding:0;
atext-decoration:none;color:#666;
a:hover
	text-decoration:underline;
	color:E4393C;

html,body

	font:12px/150% Arial,Verdana;


.wrap
	width:1000px;
	margin:0 auto;

.left
	float:left;


.content
	background:url(../image/login.jpg);
	background-size: cover;
	width:1280px;
	height:559px;


.login-frame
	margin:50px 5% 50px 5%;
	float:right;
	padding:60px;
	background:white;
	background-color:rgba(255,255,255,0.9);
	border-radius:25px;
	order-right:1px #bdbdbd solid;
	width:280px;
	height:230px;



.login-frame h2
	font-size:25px;
	height:40px;
	margin-buttom:25px;

.login-frame h2 a
	font-size:15px;
	color:#59c2c5;
	padding-left:20px;
	background:url(../image/icon5.jpg)no-repeat;


.login-frame .item
	height:60px;
	margin-buttom:40px;


.login-frame .item input
	line-height:40px;
	width:260px;
	border:none;
	border-bottom: 1px solid #59c2c5;


.login-btn
	display:block;
	height:50px;display:block;
	height:50px;
	color:#fff;
	background:#59c2c5;
	width:265px;
	font-size:16px;
	line-height:30px;
	text-align:center;
	border-radius:10px;
	border:none;
	color:#fff;
	background:#59c2c5;
	width:265px;
	font-size:16px;
	line-height:30px;
	text-align:center;
	border-radius:10px;
	border:none;

.login-frame .item1
	dislpay:flex;
	justify-content: space-between;
	margin-top:1 rem;

.login-frame .item1 a
	line-height:40px;
	font-size:1.1rem;
	margin-top:5 rem;
	padding:1rem 3rem;

③注册用户界面（register.jsp）

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<link href="css/index.css" type="text/css" rel="stylesheet">
<meta charset="UTF-8">
<script type = "text/javascript" src = "js/jquery-3.6.0.js"></script>
	
	<script type = "text/javascript">
	function check()
	
		var UID = $("#UID").val();
		var upwd = $("#upwd").val();
		var upwd1 = $("#upwd1").val();
		if(upwd != upwd1)
			alert("两次输入的密码不一致，请重新输入！");
			return false;
		
		
		return true;
	
	 $(document).ready(function()
	 );
	</script>
<title>注册账号</title>
</head>
<body>
	<form action = "AddLoginIDServlet" method = "post" onsubmit = "return check()">
	<div class = "content">
		<div class = "box">
		<div class = "item1">
		<h2>用户注册</h2>
		</div>
		<div class = "item">
		<input type = "text" name = "UID" id = "UID" placeholder="账号"/><br/>
		</div>
		<div class = "item">
		<input type = "password" name = "upwd" id = "upwd" placeholder="密码"/><br/>
		</div>
		<div class = "item">
		<input type = "password" name = "upwd1" id = "upwd1" placeholder="确认密码"/><br/>
		</div>
		<input type = "submit" class = "btn" value = "注册"/><br/>
		<a href = "login.jsp">返回</a>
		<%
		String error4 = (String) request.getAttribute("error4");
		if (error4!= null) 
		if (error4.equals("addError")) 
			out.println("注册失败！账户名已经存在！");
		 
	
	%>
	</div>
	</div>
	</form>
	
</body>
</html>

④注册用户界面css（index.css）

*margin:0;padding:0;
html,body

	font:12px/150% Arial,Verdana;

.content
	background:url(../image/login.jpg);
	background-size: cover;
	width:1280px;
	height:559px;

.box
	margin:60px 18% 60px 18%;
	float:right;
	padding:30px;
	background:white;
	background-color:rgba(255,255,255,0.9);
	border-radius:15px;
	

.item
	height:60px;
	margin-buttom:40px;

.item input
	line-height:40px;
	width:260px;
	border:none;
	border-bottom: 1px solid #59c2c5;
	border-radius:3px;

.item1
	font-size:15px;
	height:40px;

.btn
	display:block;
	height:50px;
	color:#fff;
	background:#59c2c5;
	width:265px;
	font-size:16px;
	line-height:30px;
	text-align:center;
	border-radius:10px;
	border:none;

⑤修改密码界面（UpdateLoginID.jsp）

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<link href="css/index.css" type="text/css" rel="stylesheet">
<meta charset="UTF-8"><script type = "text/javascript" src = "js/jquery-3.6.0.js"></script>
	
	<script type = "text/javascript">
	function check()
	
		var upwd = $("#upwd").val();
		var upwd1 = $("#upwd1").val();
		var upwd2 = $("#upwd2").val();
		if(upwd1 != upwd2)
			alert("两次输入的密码不一致，请重新输入！");
			return false;
		
		
		return true;
	
	 $(document).ready(function()
	 );
	</script>

<title>更改账号密码</title>
</head>
<body>
	<form action = "UpdateLoginPwdServlet" method = "post" onsubmit = "return check()">
	<div class = "content">
	<div class = "box">
	<div class= "item1"><h2>修改密码</h2></div>
	<div class = item>
	<input type = "text" name = "UID" id = "UID" placeholder="账号"/><br/>
	</div>
	<div class = item>
	<input type = "password" name = "upwd" id = "upwd" placeholder="旧密码"/><br/>
	</div>
	<div class = item>
	<input type = "password" name = "upwd1" id = "upwd1" placeholder="新密码"/><br/>
	</div>
	<div class = item>
	<input type = "password" name = "upwd2" id = "upwd2" placeholder="确认密码"/><br/>
	</div>
	<input type = "submit" class = "btn" value = "提交"/><br/>
	<a href = "login.jsp">返回</a>
	<%
	String error0 = (String) request.getAttribute("error0");
	if (error0!= null) 
		if (error0.equals("loginError")) 
			out.println("用户名或密码错误，请重新输入！");
		 else if (error0.equals("nologinError")) 
			response.sendRedirect("login.jsp");
		
	
	%>
	</div>
	</div>
	</form>
</body>
</html>

⑥注销用户界面（DeleteLoginID.jsp）

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<link href="css/index.css" type="text/css" rel="stylesheet">
<meta charset="UTF-8">
<title>注销账号</title>
</head>
<body>
	<form action = "DeleteLoginIDServlet" method = "post">
	<div class = "content">
	<div class = "box">
	<div class = "item1">
	<h2>注销账号</h2>
	</div>
	<div class = "item">
	<input type = "text" name = "UID" id = "UID" placeholder="账号"/><br/>
	</div>
	<div class = "item">
	<input type = "password" name = "upwd" id = "upwd" placeholder="密码"/><br/>
	</div>
	<input type = "submit" class = "btn" value = "注销"/><br/>
	<a href = "login.jsp">返回</a>
	<%
	String error2 = (String) request.getAttribute("error2");
	if (error2!= null) 
	if (error2.equals("loginError")) 
			out.println("用户名或密码错误！注销失败！");
		
	
		%>
	</div>
	</div>

	</form>
</body>
</html>

⑦登录成功主界面（index.jsp）

点击学号进入单个学生信息展示界面，可修改学生信息

点击删除删除学生信息

<%@page import="student.entity.Page"%>
<%@page import="java.util.List"%>
<%@page import="student.entity.Student"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
	<script type = "text/javascript" src = "js/jquery-3.6.0.js"></script>
	
	<script type = "text/javascript">
	 $(document).ready(function()
	 	$("tr:odd").css("background-color","lightgrey");
	 
	 );
	</script>
	
<link href="css/show.css" type="text/css" rel="stylesheet">
<meta charset="UTF-8">
<title>学生信息列表</title>
</head>
<body>

	<div class = "content">
	<div class = "box">
	<table  border="2" cellspacing="0">
		<tr>
			<th><h2>学号</h2></th>
			<th><h2>姓名</h2></th>
			<th><h2>年龄</h2></th>
			<th><h2>专业</h2></th>
			<th><h2>操作</h2></th>
		</tr>
		<%
		Page page1 = (Page)request.getAttribute("page1");
		
		for(Student student:page1.getStudents())
			%>
			<tr>
				<td><a href = "QueryStudentBySnoServlet?sno=<%=student.getSno()%>"><%=student.getSno() %></a></td>
				<td><%=student.getName() %></td>
				<td><%=student.getAge() %></td>
				<td><%=student.getDept() %></td>
				<td><a href = "DeleteStudentServlet?sno=<%=student.getSno() %>">删除</a></td>
			</tr>
			<%			
		
		%>
		</table>
		<div class = item>
		<a href = "add.jsp">增加学生</a>
		</div>
	<% 
		if(page1.getCurrentPage()==page1.getTotalPage()-1)
		%>
		<div class = item>
		<a href = "QueryStudentByPageServlet?currentPage=0">首页</a>
		<a href = "QueryStudentByPageServlet?currentPage=<%=page1.getCurrentPage()-1%>">上一页</a>
		</div>
		<% 
		
		else if(page1.getCurrentPage()==0)
			%>
			<div class = item>
			<a href = "QueryStudentByPageServlet?currentPage=<%=page1.getCurrentPage()+1%>">下一页</a>
			<a href = "QueryStudentByPageServlet?currentPage=<%=page1.getTotalPage()-1%>">尾页</a>
			</div>
			<%
		
		else
			%>
			<div class = item>
			<a href = "QueryStudentByPageServlet?currentPage=0">首页</a>
			<a href = "QueryStudentByPageServlet?currentPage=<%=page1.getCurrentPage()-1%>">上一页</a>
			<a href = "QueryStudentByPageServlet?currentPage=<%=page1.getCurrentPage()+1%>">下一页</a>
			<a href = "QueryStudentByPageServlet?currentPage=<%=page1.getTotalPage()-1%>">尾页</a>
			</div>
			<%
		
		%>
		<input type = "button" value = "上传作业" class = "btn"  onclick = "location = 'UpAndDown.jsp'"/><br/>
			<%
	String error = (String)request.getAttribute("error");
	if(error!=null)
	if(error.equals("addError"))
		out.println("增加失败！");
	
	else if(error.equals("noaddError"))
		out.println("增加成功！");
	
	
	
	String error1 = (String)request.getAttribute("error1");
	if(error1!=null)
	if(error1.equals("deleteError"))
		out.println("删除失败！");
	
	else if(error1.equals("nodeleteError"))
		out.println("删除成功！");
	
	
	String error2 = (String)request.getAttribute("error2");
	if(error2!=null)
	if(error2.equals("updateError"))
		out.println("修改失败！");
	
	else if(error2.equals("noupdateError"))
		out.println("修改成功！");
	
	
	
	
	String error3 = (String)request.getAttribute("error3");
	if(error3!=null)
	if(error3.equals("uploadError"))
		out.println("上传失败！");
	
	else if(error3.equals("nouploadError"))
		out.println("上传成功！");
	
	
	%>
		</div>
		</div>
</body>
</html>

⑧登陆成功界面css（show.css）

*margin:0;padding:0;
html,body

	font:12px/150% Arial,Verdana;

.content
	background:url(../image/index.JPG);
	background-size: cover;
	width:1280px;
	height:559px;

.box
	margin:60px 18% 60px 18%;
	float:right;
	padding:30px;
	background:white;
	background-color:rgba(255,255,255,0.9);
	border-radius:15px;
	

.item
	height:40px;
	
	border-radius:15px;

.item a
	background-color: lightgrey;
	text-decoration: none;
	font-size:15px;
	color:black;
	border-radius:3px;

.item1
	font-size:15px;
	height:40px;

table
	width:100%;
	border-collapse:collapse;

table body
	diaplay:block;
	height:300px;
	overflow-y: scroll;

table td
	border:1px solid #A6A6A6;
	height:60px;
	width:300px;
	text-align: center;
	font-size: 15px;

table th
	height:60px;
	border:1px solid #A6A6A6;

⑨点击学号，修改学生信息界面（StudentInfo.jsp）

<%@page import="student.entity.Student"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<link href="css/index.css" type="text/css" rel="stylesheet">
<title>修改学生信息</title>
</head>
<body>
	<%
		Student student = (Student)request.getAttribute("student");
	%>		
	<form action = "UpdateStudentServlet" method = "post">
	<div class = "content">
	<div class = "box">
	<div class = "item1">
	<h2>修改学生信息</h2>
	</div>
		<div class = "item">
		学号:<input type = "text" name = "sno" value ="<%=student.getSno()%>" readonly = "readonly"/><br/>
		</div>
		<div class = "item">
		姓名:<input type = "text" name = "name" value ="<%=student.getName()%>"/><br/>
		</div>
		<div class = "item">
		年龄:<input type = "text" name = "age" value ="<%=student.getAge()%>"/><br/>
		</div>
		<div class = "item">
		专业:<input type = "text" name = "dept" value ="<%=student.getDept()%>"/><br/>
		</div>
		<input type = "submit" class = "btn" value = "修改"/>
		<a href = "QueryStudentByPageServlet">返回</a>
		</div>
		</div>
	</form>
</body>
</html>

⑩增加学生信息（add.jsp）

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<link href="css/index.css" type="text/css" rel="stylesheet">
<script type = "text/javascript" src = "js/jquery-3.6.0.js"></script>
	
	<script type = "text/javascript">
	function check()
	
		var sname = $("#sname").val();
		var sno = $("#sno").val();
		var sage = $("#sage").val();
		var sdept = $("#sdept").val();
		if(!(sno>1&&sno<2000))
			alert("学号有误！必须是1-2000");
			return false;
		
		if(!(sname.length>1&&sname.length<5))
			alert("姓名有误！必须是2-4位");
			return false;
		
		if(!(sage>1&&sage<100))
			alert("年龄有误！必须是1-100");
			return false;
		
		return true;
	
	 $(document).ready(function()
	 );
	</script>
	
<title>增加学生信息</title>
</head>
<body>
	<form action = "AddStudentServlet" method = "post"  onsubmit = "return check()">
	<div class = "content">
	<div class = "box">
	<div class = "item2">
	<h2>增加学生信息</h2>
	</div>
	<div class = "item">
	<input type = "text" name = "name" id = "sname" placeholder="姓名"/><br/>
	</div>
	<div class = "item">
	<input type = "text" name = "sno" id = "sno" placeholder="学号"/><br/>
	</div>
	<div class = "item">
	<input type = "text" name = "age" id = "sage" placeholder="年龄"/><br/>
	</div>
	<div class = "item">
	<input type = "text" name = "dept" id = "sdept" placeholder="专业"/><br/>
	</div>
	<input type = "submit" class = "btn" value = "增加"/><br/>
	<a href = "QueryStudentByPageServlet">返回</a>
	</div>
	</div>
	</form>
</body>
</html>

⑪上传作业操作（UpAndDown.jsp）

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<link href="css/index.css" type="text/css" rel="stylesheet">
<title>上传作业</title>
</head>
<body>
	<form action ="UploadServlet" method = "post" enctype = "multipart/form-data">
	<div class = "content">
	<div class = "box">
	<div class = "item2">
	<h2>上传作业</h2>
	</div>
	<div class = "item">
	<input type = "text" name="sno" placeholder="学号"/><br/>
	</div>
	<div class = "item">
	<input type = "text" name = "name" placeholder="姓名"/><br/>
	</div>
	<input type = "file" name = "spiature"/>
	<br/>
	<br/>
	<input type = "submit" class = "btn" value ="上传"/>
	<a href = "QueryStudentByPageServlet">返回</a>
	</div>
	</div>
	</form>
</body>
</html>

2.三层架构

①表示层Servlet

检查登录的用户名和密码是否匹配（CheckLoginServlet.java）

package student.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;


public class CheckLoginServlet extends HttpServlet 
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("utf-8");
		String ID = request.getParameter("UID");
		String pwd = request.getParameter("upwd");
		IStudentService service = new StudentServiceImpl();
		boolean result = service.checkLoginID(ID,pwd);
		response.setContentType("text/html;charest=UTF-8");
		response.setCharacterEncoding("utf-8");
		if(!result) 
			request.setAttribute("error", "loginError");
		else 
			request.setAttribute("error", "nologinError");
		
		request.getRequestDispatcher("login.jsp").forward(request, response);
	

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		// TODO Auto-generated method stub
		doGet(request, response);

注册账户表示层（AddLoginIDServlet.java）

package student.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

/**
 * Servlet implementation class AddLoginIDServlet
 */
public class AddLoginIDServlet extends HttpServlet 
	private static final long serialVersionUID = 1L;
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("utf-8");
		String ID = request.getParameter("UID");
		String pwd = request.getParameter("upwd");
		IStudentService studentService = new StudentServiceImpl();
		boolean result = studentService.addLoginID(ID,pwd);
		
		response.setContentType("text/html;charest=UTF-8");
		response.setCharacterEncoding("utf-8");
		if(!result) 
			request.setAttribute("error4", "addError");
			request.getRequestDispatcher("register.jsp").forward(request, response);
		else 
			request.setAttribute("error4", "noaddError");
			request.getRequestDispatcher("login.jsp").forward(request, response);
		
		
	

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		// TODO Auto-generated method stub
		doGet(request, response);

修改密码表示层（UpdateLoginPwdServlet.java）

package student.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

/**
 * Servlet implementation class UpdateLoginPwdServlet
 */
public class UpdateLoginPwdServlet extends HttpServlet 
	private static final long serialVersionUID = 1L;
       
   
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("utf-8");
		String ID = request.getParameter("UID");
		String pwd = request.getParameter("upwd");
		String pwd1 = request.getParameter("upwd1");
		IStudentService service = new StudentServiceImpl();
		boolean result = service.checkLoginID(ID,pwd);
		response.setContentType("text/html;charest=UTF-8");
		response.setCharacterEncoding("utf-8");
		if(!result) 
			request.setAttribute("error0", "loginError");
			request.getRequestDispatcher("UpdateLoginPwd.jsp").forward(request, response);
		else 
			request.setAttribute("error0", "nologinError");
			boolean result1 = service.updateLoginPwd(ID,pwd1);
			if(!result1) 
				request.getRequestDispatcher("UpdateLoginPwd.jsp").forward(request, response);
			else 
				request.setAttribute("error1", "noupdateError");
				request.getRequestDispatcher("login.jsp").forward(request, response);
			
		
	

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		// TODO Auto-generated method stub
		doGet(request, response);

注销用户表示层（DeleteLoginIDServlet.java）

package student.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

/**
 * Servlet implementation class DeleteLoginIDServlet
 */
public class DeleteLoginIDServlet extends HttpServlet 
	private static final long serialVersionUID = 1L;
    
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("utf-8");
		String ID = request.getParameter("UID");
		String pwd = request.getParameter("upwd");
		IStudentService service = new StudentServiceImpl();
		boolean result = service.checkLoginID(ID,pwd);
		boolean result1 = service.deleteLoginID(ID);
		response.setContentType("text/html;charest=UTF-8");
		response.setCharacterEncoding("utf-8");
		if(!result) 
			request.setAttribute("error2", "loginError");
			request.getRequestDispatcher("DeleteLoginID.jsp").forward(request, response);
		else 
			request.setAttribute("error2", "nologinError");
			if(!result1) 
				request.setAttribute("error3", "deleteError");
				request.getRequestDispatcher("DeleteLoginID.jsp").forward(request, response);
			else 
				request.setAttribute("error3", "nodeleteError");
				request.getRequestDispatcher("login.jsp").forward(request, response);
		
		
	

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		// TODO Auto-generated method stub
		doGet(request, response);

分页显示（QueryStudentByPageServlet.java）

package student.servlet;

import java.io.IOException;
import java.util.List;

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

import student.entity.Page;
import student.entity.Student;
import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

public class QueryStudentByPageServlet extends HttpServlet 
	private static final long serialVersionUID = 1L;
    public QueryStudentByPageServlet() 
        super();
    
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		IStudentService studentService = new StudentServiceImpl();
		int count = studentService.getTotalCount();
		
		Page page = new Page();
		
		
		String cPage = request.getParameter("currentPage");
		
		if(cPage == null) 
			cPage = "0";
		
		int currentPage = Integer.parseInt(cPage);
		page.setCurrentPage(currentPage);

		int totalCount = studentService.getTotalCount();
		page.setTotalCount(totalCount);
		int pageSize = 4;
		
		page.setPageSize(pageSize);
		
		List<Student> students = studentService.queryStudentsByPage(currentPage, pageSize);
		
		page.setStudents(students);
		request.setAttribute("page1", page);
		request.getRequestDispatcher("index.jsp").forward(request, response);
	

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		// TODO Auto-generated method stub
		doGet(request, response);

按学号查询学生信息（QueryStudentBySnoServlet.java）

package student.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import student.entity.Student;
import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

public class QueryStudentBySnoServlet extends HttpServlet 
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
	request.setCharacterEncoding("UTF-8");
	int sno = Integer.parseInt(request.getParameter("sno"));
	IStudentService service = new StudentServiceImpl();
	Student student = service.queryStudentBySno(sno);
	request.setAttribute("student", student);//将查询到的request信息放在request域中
	request.getRequestDispatcher("StudentInfo.jsp").forward(request,response);
	

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		doGet(request, response);

增加学生信息（AddStudentServlet.java）

package student.servlet;

import java.io.IOException;

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

import student.entity.Student;
import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

public class AddStudentServlet extends HttpServlet 

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("utf-8");
		String name = request.getParameter("name");
		int sno = Integer.parseInt(request.getParameter("sno"));
		int age = Integer.parseInt(request.getParameter("age"));
		String dept = request.getParameter("dept");
		Student student = new Student(name, sno, age, dept);
		
		IStudentService studentService = new StudentServiceImpl();
		boolean result = studentService.addStudent(student);
		
		response.setContentType("text/html;charest=UTF-8");
		response.setCharacterEncoding("utf-8");
		if(!result) 
			request.setAttribute("error", "addError");
		else 
			request.setAttribute("error", "noaddError");
		
		request.getRequestDispatcher("QueryStudentByPageServlet").forward(request, response);
	

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		doGet(request, response);

删除学生信息（DeleteStudentServlet.java）

package student.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

/**
 * Servlet implementation class DeleteStudentServlet
 */
public class DeleteStudentServlet extends HttpServlet 
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("utf-8");
		int sno = Integer.parseInt(request.getParameter("sno"));
		IStudentService service = new StudentServiceImpl();
		boolean result = service.deleteStudentBySno(sno);
		response.setContentType("text/html;charest=UTF-8");
		response.setCharacterEncoding("utf-8");
		if(!result) 
			request.setAttribute("error1", "deleteError");
		else 
			request.setAttribute("error1", "nodeleteError");
		
		request.getRequestDispatcher("QueryStudentByPageServlet").forward(request, response);
	

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		// TODO Auto-generated method stub
		doGet(request, response);

修改学生信息表示层（UpdateStudentServlet.java）

package student.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import student.entity.Student;
import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;

public class UpdateStudentServlet extends HttpServlet 

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;


	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("UTF-8");
		String name = request.getParameter("name");
		int sno = Integer.parseInt(request.getParameter("sno"));
		int age = Integer.parseInt(request.getParameter("age"));
		String dept = request.getParameter("dept");
		Student student = new Student(name, age, dept);
		
		System.out.println(sno);
		
		IStudentService service = new StudentServiceImpl();
		boolean result = service.updateStudentBySno(sno, student);
		
		response.setContentType("text/html;charest=UTF-8");
		response.setCharacterEncoding("utf-8");
		if(!result) 
			request.setAttribute("error2", "updateError");
		else 
			request.setAttribute("error2", "noupdateError");
		

		request.getRequestDispatcher("QueryStudentByPageServlet").forward(request, response);
	
		

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		doGet(request, response);

上传作业（UploadServlet.java）

package student.servlet;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import student.service.IStudentService;
import student.service.impl.StudentServiceImpl;


public class UploadServlet extends HttpServlet 
	private static final long serialVersionUID = 1L;
    
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		String name = null;
		int sno = -1;
		
		boolean isMutipart = ServletFileUpload.isMultipartContent(request);
		if(isMutipart) 
			DiskFileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);
			factory.setRepository(new File("D:\\\\uploadtemp"));
			List<FileItem> items = null;
				try 
					items = upload.parseRequest(request);
				 catch (FileUploadException e) 
					// TODO Auto-generated catch block
					e.printStackTrace();
				
			Iterator<FileItem> iter = items.iterator();
			while(iter.hasNext()) 
				FileItem item= iter.next();
				String fileName = item.getName();
				String itemName = item.getFieldName();
				if(item.isFormField()) 
					if(itemName.equals("name"))
						name = item.getString("utf-8");
					else if(itemName.equals("sno")) 
						sno =Integer.parseInt(item.getString("utf-8"));
					else 
						
					
				else 
					//定义上传路径：指定上传的位置
					String path = "D:\\\\upload";
					File file = new File(path,fileName);
						try 
							item.write(file);
							 catch (Exception e) 
							e.printStackTrace();
							
			
		
		IStudentService studentService = new StudentServiceImpl();
		boolean result = studentService.upLoadWork(sno,name);
		
		System.out.println(name+sno);
		System.out.println(result);
		if(!result) 
			request.setAttribute("error3", "uploadError");
			request.getRequestDispatcher("QueryStudentByPageServlet").forward(request, response);
			
		else
			request.setAttribute("error3", "nouploadError");
			request.getRequestDispatcher("QueryStudentByPageServlet").forward(request, response);
			
		
		
	


	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
		// TODO Auto-generated method stub
		doGet(request, response);

②业务逻辑层Service

Service接口（IStudentService.java）

package student.service;

import java.util.List;

import student.entity.Student;

public interface IStudentService 
	//查询全部学生信息
	public List<Student> queryAllStudents();
	//按照学号查询学生信息
	public Student queryStudentBySno(int sno);
	//删除学生信息
	public boolean deleteStudentBySno(int sno) ;
	
	//更改学生信息
	public boolean updateStudentBySno(int sno, Student student) ;
	
	//增加学生信息
	public boolean addStudent(Student student) ;
	
	//查询总数据
	public int getTotalCount();
	//分页
	public List<Student> queryStudentsByPage(int current, int pageSize);
	//检查登陆账户和密码
	public boolean checkLoginID(String ID,String pwd);
	//注册账户
	public boolean addLoginID(String ID, String pwd);
	//更改密码
	public boolean updateLoginPwd(String ID,String pwd1);
	//注销账号
	public boolean deleteLoginID(String ID);
	//判断ID是否存在
	public boolean IDExist(String ID);
	//判断上传作业输入的学生信息是否存在
	public boolean upLoadWork(int sno, String name);

接口的实现类（StudentServiceImpl.java）

package student.service.impl;

import java.util.List;

import student.dao.IStudentDao;
import student.dao.impl.StudentDaoImpl;
import student.entity.Student;
import student.service.IStudentService;
import student.util.DBUtil;

//业务逻辑层：逻辑性的增删改查（增：查+增），对dao层进行的组装
public class StudentServiceImpl implements IStudentService
	IStudentDao studentDao = new StudentDaoImpl();
	//查询全部学生信息
	public List<Student> queryAllStudents()
		return studentDao.queryAllStudents();
	
	//按照学号查询学生信息
	public Student queryStudentBySno(int sno) 
		return studentDao.queryStudentBySno(sno);
		
	
	//删除学生信息
	public boolean deleteStudentBySno(int sno) 
		if(studentDao.isExist(sno)) 
			return studentDao.deleteStudentBySno(sno);
		
			return false;
	
	
	
	//更改学生信息
	public boolean updateStudentBySno(int sno, Student student) 
			return studentDao.updateStudentBySno(sno, student);
	
	
	
	//增加学生信息
	public boolean addStudent(Student student) 
		if(!studentDao.isExist(student.getSno())) 
			studentDao.addStudent(student);
			return true;
		else 
			System.out.println("学号重复！");
			return false;
		
	
	
	//查询总条数
	@Override
	public int getTotalCount() 
		return studentDao.getTotalCount();
	
	//查询当前页的数据集合
	@Override
	public List<Student> queryStudentsByPage(int current, int pageSize) 
		return studentDao.queryStudentByPage(current, pageSize);
	
	
	
	@Override
	public boolean checkLoginID(String ID, String pwd) 
		return studentDao.checkLoginID(ID, pwd);
	
	@Override
	public boolean addLoginID(String ID, String pwd) 
		return studentDao.addLoginID(ID,pwd);
					
	
	@Override
	public boolean updateLoginPwd(String ID, String pwd1) 
		return studentDao.updateLoginPwd(ID,pwd1);
	
	@Override
	public boolean deleteLoginID(String ID) 
		return studentDao.deleteLoginID(ID);
	
	@Override
	public boolean IDExist(String ID) 
		return studentDao.IDExist(ID);
	
	@Override
	public boolean upLoadWork(int sno, String name) 
		return studentDao.upLoadWork(sno,name);

③数据访问层Dao

接口（IStudentDao.java）

package student.dao;

import java.util.List;

import student.entity.Student;

public interface IStudentDao 
	public boolean updateLoginPwd(String ID,String pwd1);


	//查询全部学生信息
	public List<Student> queryAllStudents();
	
	
	//判断此人是否存在
	public boolean isExist(int sno) ;
	
	//增加学生信息
	public boolean addStudent(Student student);
	//删除学生信息
	public boolean deleteStudentBySno(int sno);
	
	//根据sno找到要修改的学生，然后再进行修改
	public boolean  updateStudentBySno(int sno,Student student);
	//根据学号查询学生信息
	public Student queryStudentBySno(int sno);
	
	//查询总数据数
	public int getTotalCount();
	//currentPage:当前页（页码）pageSize:页面大小（每页显示的数据条数）
	public List<Student> queryStudentByPage(int currentPage,int pageSize);
	
	public boolean checkLoginID(String ID,String pwd);


	public boolean addLoginID(String ID, String pwd);


	public boolean deleteLoginID(String ID);


	public boolean IDExist(String ID);


	public boolean upLoadWork(int sno, String name);

接口的实现类（StudentDaoImpl.java）

package student.dao.impl;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import student.dao.IStudentDao;
import student.entity.Student;
import student.util.DBUtil;

public class StudentDaoImpl implements IStudentDao
	
	private final String URL = "jdbc:mysql://localhost:3306/STUDENT?useSSL=false&serverTimezone=UTC";
	private final String UserName = "root";
	private final String Pwd = "123456";

	String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
	//查询全部学生信息
	public List<Student> queryAllStudents()
		PreparedStatement pstmt = null;
		Student student = null;
		List<Student> students = new ArrayList<>();
		ResultSet rs = null;
		try 
			String sql = "select * from student1";
			rs = DBUtil.executeQuery(sql, null);
			while(rs.next()) 
				int sno= rs.getInt("sno");
				String name = rs.getString("name");
				int age = rs.getInt("age");
				String dept = rs.getString("dept");
				student = new Student(name, sno, age, dept);
				students.add(student);
			
			return students;
			
		 catch(Exception e) 
			e.printStackTrace();
			return null;
		
		finally 
			DBUtil.closeAll(rs, pstmt, DBUtil.connection);
	
	
	
	
	//判断此人是否存在
	public boolean isExist(int sno) 
		return queryStudentBySno(sno) == null? false:true;
	
	
	//增加学生信息
	public boolean addStudent(Student student) 
		String sql = "insert into student1(name,sno,age,dept) values(?,?,?,?)";
		Object[] params = student.getName(),student.getSno(),student.getAge(),student.getDept();
		return DBUtil.executeUpdate(sql, params);
	
	//删除学生信息
	public boolean deleteStudentBySno(int sno) 
		String sql = "delete from student1 where sno =?";
		Object[] params = sno;
		return DBUtil.executeUpdate(sql, params);
	
	
	//根据sno找到要修改的学生，然后再进行修改
	public boolean  updateStudentBySno(int sno,Student student) 
		String sql = "update student1 set name =?,age=?,dept=? where sno=?";
		Object[] params = student.getName(),student.getAge(),student.getDept(),sno;
		
		return DBUtil.executeUpdate(sql, params);
		
	
	//根据学号查询学生信息
	public Student queryStudentBySno(int sno)
		PreparedStatement pstmt = null;
		Student student = null;
		Connection connection = null;
		ResultSet rs = null;
		try 
			Class.forName(JDBC_DRIVER);
			connection = DriverManager.getConnection(URL,UserName,Pwd);
			String sql = "select * from student1 where sno = ?";
			pstmt = connection.prepareStatement(sql);
			pstmt.setInt(1, sno);
			rs = pstmt.executeQuery();
			if(rs.next()) 
				int no= rs.getInt("sno");
				String name = rs.getString("name");
				int age = rs.getInt("age");
				String dept = rs.getString("dept");
				student = new Student(name, no, age, dept);
			
			return student;
			
		 catch (ClassNotFoundException e) 
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		 catch(SQLException e) 
			e.printStackTrace();
			return null;
		catch(Exception e) 
			e.printStackTrace();
			return null;
		
		finally 
			DBUtil.closeAll(rs, pstmt, DBUtil.connection);
				

	


	@Override
	public int getTotalCount() //查询总数据数
		String sql = "select count(1) from student1";
		return DBUtil.getTotalCount(sql);
	


	@Override
	public List<Student> queryStudentByPage(int currentPage, int pageSize) 
		String sql = "select * from student1 order by sno asc limit ?,?";
		Object[] params = currentPage*pageSize,pageSize;
		
		List<Student> students = new ArrayList<>();
		ResultSet rs = DBUtil.executeQuery(sql, params);
		try 
			while(rs.next()) 
				Student student = new Student(rs.getString("name"),rs.getInt("sno"),rs.getInt("age"),rs.getString("dept"));
				students.add(student);
			
		 catch (SQLException e) 
			e.printStackTrace();
		catch (Exception e) 
			e.printStackTrace();
		
		return students;
	


	@Override
	public boolean checkLoginID(String ID, String pwd)
		int count = 0;
		String sql = "select * from login where ID=? and pwd=?";
		Object[] params = ID,pwd;
		ResultSet rs = DBUtil.executeQuery(sql, params);
		try 
			while(rs.next()) 
				count++;
			
			if(count>0)
				return true;
			else
				return false;
		 catch (SQLException e) 
			e.printStackTrace();
			
				return false;
	


	@Override
	public boolean addLoginID(String ID, String pwd) 
		// TODO Auto-generated method stub
		String sql = "insert into login(ID,pwd) values(?,?)";
		Object[] params = ID,pwd;
		return DBUtil.executeUpdate(sql, params);
	


	@Override
	public boolean updateLoginPwd(String ID, String pwd1) 
		String sql = "update login set pwd =? where ID=?";
		Object[] params = pwd1,ID;
		return DBUtil.executeUpdate(sql, params);
	


	@Override
	public boolean deleteLoginID(String ID) 
		String sql = "delete from login where ID =?";
		Object[] params = ID;
		return DBUtil.executeUpdate(sql, params);
	


	@Override
	public boolean IDExist(String ID) 
		String sql = "select *from login where ID = ?";
				Object[] params = ID;
		return DBUtil.executeUpdate(sql, params);
	


	@Override
	public boolean upLoadWork(int sno, String name) 
		int count = 0;
		String sql = "select *from student1 where sno = ? and name = ?";
		Object[] params = sno,name;
		ResultSet rs = DBUtil.executeQuery(sql, params);
		try 
			while(rs.next()) 
				count++;
			
			if(count>0)
				return true;
			else
				return false;
		 catch (SQLException e) 
			e.printStackTrace();
			
				return false;

④通用的数据库操作（DBUtils.java）

package student.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import j
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