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;}
a{text-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 java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import student.entity.Student;
//通用的数据库操作方法
public class DBUtil {
private static final String URL = "jdbc:mysql://localhost:3306/STUDENT?useSSL=false&serverTimezone=UTC";
private static final String UserName = "root";
private static final String Pwd = "123456";
private static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
public static Connection connection = null;
public static PreparedStatement pstmt = null;
public static ResultSet rs = null;
//查询总数
public static int getTotalCount(String sql){
int count = -1;
try {
pstmt = createPreParedStatement(sql,null);
rs = pstmt.executeQuery();
if(rs.next()) {
count = rs.getInt(1);
}
} catch (SQLException e) {
e.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}finally {
closeAll(rs,pstmt,connection);
}
return count;
}
//增删改
public static boolean executeUpdate(String sql,Object[] params) {
try {
pstmt = createPreParedStatement(sql,params);
int count = pstmt.executeUpdate();
System.out.println(count);
if(count>0) {
return true;
}
else {
return false;
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
return false;
} catch(SQLException e) {
e.printStackTrace();
return false;
}catch(Exception e) {
e.printStackTrace();
return false;
}
finally {
closeAll(null,pstmt,connection);
}
}
public static void closeAll(ResultSet rs,Statement stmt,Connection connection){
try{
if(rs!=null)rs.close();
if(pstmt!=null)pstmt.close();
if(connection!=null)connection.close();
}catch(SQLException e) {
e.printStackTrace();
}
}
public static PreparedStatement createPreParedStatement(String sql,Object[] params) throws ClassNotFoundException, SQLException {
pstmt = getConnection().prepareStatement(sql);
if(params!=null) {
for(int i = 0;i<params.length;i++) {
pstmt.setObject(i+1, params[i]);
}
}
return pstmt;
}
public static Connection getConnection() throws ClassNotFoundException, SQLException {
Class.forName(JDBC_DRIVER);
return DriverManager.getConnection(URL,UserName,Pwd);
}
//通用的查
public static ResultSet executeQuery(String sql,Object[] params){
List<Student> students = new ArrayList<>();
Student student = null;
try {
pstmt = createPreParedStatement(sql,params);
rs = pstmt.executeQuery();
return rs;
} catch(SQLException e) {
e.printStackTrace();
return null;
}catch(Exception e) {
e.printStackTrace();
return null;
}
}
}
3.JavaBean封装数据
①分页帮助类（Page.java）
package student.entity;
import java.util.List;
//分页帮助类
public class Page {
private int currentPage;
private int pageSize;
private int totalCount;
private int totalPage;
private List<Student> students;
public Page() {
}
public Page(int currentPage, int pageSize, int totalCount, int totalPage, List<Student> students) {
this.currentPage = currentPage;
this.pageSize = pageSize;
this.totalCount = totalCount;
this.totalPage = totalPage;
this.students = students;
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
this.totalPage = this.totalCount%this.pageSize==0?this.totalCount/this.pageSize:this.totalCount/this.pageSize+1;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public int getTotalPage() {
return totalPage;
}
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
}
②封装学生信息（Student.java）
package student.entity;
public class Student {
private String name;
private int sno;
private int age;
private String dept;
public Student(int sno) {
this.sno = sno;
}
public Student() {
}
public Student(String name, int age, String dept) {
this.name = name;
this.age = age;
this.dept = dept;
}
public Student(String name, int sno, int age, String dept) {
this.name = name;
this.sno = sno;
this.age = age;
this.dept = dept;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getSno() {
return sno;
}
public void setSno(int sno) {
this.sno = sno;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getDept() {
return dept;
}
public void setDept(String dept) {
this.dept = dept;
}
public String toString() {
return this.getSno()+"-"+this.getName()+"-"+this.getAge()+"-"+this.getDept();
}
}
4.项目所需jar包
项目需要3个jar包，前两个jar包属于文件上传所需，最后一个为连接数据库的jar包
下载官网地址：https://mvnrepository.com/
五.数据库表格
本人用的是mysql数据库，直接在mysql数据库中新建表格
①登录注册表格login
②学生信息表格student1
