JAVA分级测试——选课系统（补发）
博客园似乎上传图片多了之后会出现各种问题，所以只能直接上代码了
<!DOCTYPE HTML>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title>石家庄铁道大学学生选课系统</title>
<link rel="stylesheet" type="text/css" href="css/login®ister.css">
<link rel="icon" type="image/x-ico" href="images/stu.ico">
</head>
<body>
<!--Header-->
<header>
<nav>
<ul>
<a href="Login.html"><li>首页</li></a>
</ul>
</nav>
</header> <!--Main-->
<main>
<div class="container">
<img class="login_bg" src="data:images/login.png">
<form class="form" action="LoginServlet" method="post">
<h3>学生选课管理系统</h3>
用户类别:<select name="UserSort" size="1">
<option value="1">学生</option>
<option value="2">教师</option>
<option value="3">管理员</option>
</select>
<input type="text" autofocus="autofocus" name="username" value="" placeholder="用户名" required="required">
<input type="password" name="password" value="" placeholder="密码" required="required">
<input id="submit" type="submit" name="submit" value="登录">
<input id="submit" type="reset" name="submit" value="清空">
</form>
</div>
</main> <!--Footer-->
<footer>
<div class="info">
<ul>
<a href="#"><li>学生选课管理系统</li></a>
<a href="#"><li>帮助与反馈</li></a>
</ul>
</div>
<div class="copyright">
© Copyright. All rights reserved. Design by <a href="http://www.github.com/Soarkey/">Soarkey</a>
</div>
</footer>
</body>
</html>
Login.html
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
alert("${message}"); /* 提示信息 */
document.location.href='${url}'; /* 页面转换 */
</script>
</head>
<body> </body>
</html>
message.jsp
<%@page import="bean.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset=UTF-8>
<title>错误信息</title>
<link rel="stylesheet" type="text/css" href="css/message.css">
<link rel="icon" type="image/x-ico" href="images/stu.ico">
</head>
<body>
<main>
<div class="message">
<div class="left">
<%
//获取提示信息
String info = (String) request.getAttribute("info");
//如果提示信息不为空，则输出
if(info != null){
%>
<h3><%=info%></h3>
<%
}
//获取登录成功的用户信息
User user = (User) session.getAttribute("user");
//判断用户是否登录
if(user != null){ }else{
//out.print("<script>alert('对不起！您还未登录！');</script>");
%>
<p><%="对不起！您还未登录！"%></p>
<%
}
%>
</div>
<div class="right">
<a class="relogin" href="Login.html">重新登录></a>
</div>
</div>
</main> <footer>
<div class="info">
<ul>
<a href="#"><li>学生选课管理系统</li></a>
<a href="#"><li>联系我们</li></a>
</ul>
</div>
<div class="copyright">
© Copyright. All rights reserved. Design by <a href="http://www.github.com/Soarkey/">Soarkey</a>
</div>
</footer>
</body>
</html>
error.jsp
<%@page import="bean.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>管理员后台界面</title>
<link rel="stylesheet" type="text/css" href="css/user&admin.css">
<link rel="icon" type="image/x-ico" href="images/stu.ico">
</head>
<body>
<header>
<div class="title">
<span>管理员操作界面</span>
</div>
<nav>
<div class="userinfo">
<ul>
<li>${UNAME}</li>
<li><a href="UserExitServlet">退出登录</a></li>
</ul>
</div>
</nav>
</header> <main>
<div class="container">
<div class="select">
<h3>请选择操作</h3>
<ul id="accordion" class="accordion">
<li>
<div id="user-info" class="link">教师信息管理</div>
<ul class="submenu">
<li><a onclick="show_insert_user()">新增教师信息</a></li>
</ul>
</li>
<li>
<div class="link">学生信息管理</div>
<ul class="submenu">
<li><a onclick="show_insert_student()">新增学生信息</a></li>
</ul>
</li>
</ul>
</div>
<div id="result" class="result">
<p class="welcome">欢迎使用学生选课管理系统！</p>
</div>
</div>
</main> <footer>
<div class="copyright">
© Copyright. All rights reserved. Design by <a href="http://www.github.com/Soarkey/">Soarkey</a>
</div>
</footer> <script src="js/jquery-3.1.1.min.js"></script>
<script src="js/admin.js"></script>
</body>
</html>
A_Home.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body bgcolor="#e5eecc">
<form name="Seekfrom"
action="${pageContext.request.contextPath}/ElectCourseServlet"
method="post" target="_self">
<table align="center">
<tr>
<td align="center" colspan="4">
<h3>搜索课程</h3>
<hr>
</td>
</tr>
<tr>
<td><input name="seek" type="radio" value="模糊查询" checked>模糊查询
<input name="seek" type="radio" value="精确查询">精确查询</td>
<td width="80px"><select name="select">
<option>名称</option>
<option>编号</option>
<option>授课教师</option>
</select></td>
<td><input type="text" name="name" /></td>
<td align="center" colspan="2"><input type="submit"
value="搜 索"></td>
</tr>
</table>
</form>
<br>
<table align="center" width="1000" border="1">
<tr>
<td align="center" ><b>课程信息</b></td>
</tr>
</table>
<table align="center" width="1000" border="1" height="120"
cellpadding="1" cellspacing="1"> <tr align="center" ">
<td><b>编号</b></td>
<td><b>名称</b></td>
<td><b>上课教师</b></td>
<td><b>限制人数</b></td>
<td><b>可选人数</b></td>
<td><b>是否选修</b>
</tr>
<c:forEach items="${requestScope.list}" var="c">
<tr align="center" bgcolor="white">
<td>${c.getCNO()}</td>
<td>${c.getCName()}</td>
<td>${c.getCTeacher()}</td>
<td>${c.getCLimitNum()}</td>
<td>${c.getCResidueNum()}</td>
<td><a
href="${pageContext.request.contextPath}/ElectCourseServlet?id=elect&No=${c.getCNO()}">选修</a></td>
</tr>
</c:forEach>
</table>
</body>
</html>
ElectCourse.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<link rel="stylesheet" type="text/css" href="css/login®ister.css">
<link rel="icon" type="image/x-ico" href="images/stu.ico">
</head>
<body>
<body bgcolor="#e5eecc">
<form action="${pageContext.request.contextPath}/AddStudent_Servlet"
method="post" id="myform">
<h3> 添加学生信息：</h3>
<table width="650px" border="1" align="center" cellpadding="2"
cellspacing="2" bgcolor="#EEE8AA">
<tr>
<td width="150px" align="center">身 份：</td>
<td>学 生</td>
</tr>
<tr>
<td width="150px" align="center"><label for="No">学
号：</label></td>
<td><input type="text" name="No" size="19" id="No" /></td>
</tr>
<tr>
<td width="150px" align="center"><label for="username">姓
名：</label></td>
<td><input type="text" name="username" size="19" id="username" /></td>
</tr>
<tr>
<td width="150px" align="center">性 别：</td>
<td><input type="radio" name="sex" value='男' checked>男
<input type="radio" name="sex" value='女'>女</td>
</tr>
<tr>
<td width="150px" align="center"><label for="class">班 级：</label></td>
<td><input type="text" name="class" size="19" id="class" /></td>
</tr>
<tr>
<td width="150px" align="center"><label for="major">专 业：</label></td>
<td><input type="text" name="department" size="19"
id="department" /></td>
</tr>
<tr>
<td width="150px" align="center"><label for="password">密 码：</label></td>
<td><input id="password" name="password" type="password"
size="20"></td>
</tr>
<tr>
<td width="150px" align="center"><label for="password_2">确认新密码：</label></td>
<td><input type="password" name="password_2" size="20"
id="password_2" /></td>
</tr>
<tr>
<td align="center" colspan="2"><input type="submit" value="添加">
<input name="reset"
type="reset" value="重 置"></td>
</tr>
</table>
</form>
</body>
</html>
AddStudent.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>学生选课界面</title>
<link rel="stylesheet" type="text/css" href="css/user&admin.css">
<link rel="icon" type="image/x-ico" href="images/stu.ico">
</head>
<body>
<header>
<div class="title">
<span>学生操作界面</span>
</div>
<nav>
<div class="userinfo">
<ul>
<li>${UNAME}</li>
<li><a href="UserExitServlet">退出登录</a></li>
</ul>
</div>
</nav>
</header> <main>
<div class="container">
<div class="select">
<h3>请选择操作</h3>
<ul id="accordion" class="accordion">
<li>
<div id="user-info" class="link">个人信息管理</div>
<ul class="submenu">
<li><a href="${pageContext.request.contextPath}/StudentInfoServlet?id=update" target="result" onclick="$('div#result').load(this.href);return false;">修改个人信息</a></li>
</ul>
</li>
<li>
<div class="link">课程信息管理</div>
<ul class="submenu">
<li><a href="${pageContext.request.contextPath}/ElectCourseServlet?id=seekall" target="result" onclick="$('div#result').load(this.href);return false;">选课</a></li>
<li><a onclick="show_course_teacher()">查看课程信息</a></li>
</ul>
</li>
</ul>
</div>
<div id="result" class="result">
<p class="welcome">欢迎使用学生选课管理系统！</p>
</div>
</div>
</main> <footer>
<div class="copyright">
© Copyright. All rights reserved. Design by <a href="http://www.github.com/Soarkey/">Soarkey</a>
</div>
</footer> <script src="js/jquery-3.1.1.min.js"></script>
<script src="js/admin.js"></script>
</body>
</html>
S_Home.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>教师管理界面</title>
<link rel="stylesheet" type="text/css" href="css/user&admin.css">
<link rel="icon" type="image/x-ico" href="images/stu.ico">
</head>
<body>
<header>
<div class="title">
<span>教师操作界面</span>
</div>
<nav>
<div class="userinfo">
<ul>
<li>${UNAME}</li>
<li><a href="UserExitServlet">退出登录</a></li>
</ul>
</div>
</nav>
</header> <main>
<div class="container">
<div class="select">
<h3>请选择操作</h3>
<ul id="accordion" class="accordion">
<li>
<div id="user-info" class="link">个人信息管理</div>
<ul class="submenu">
<li><a href="${pageContext.request.contextPath}/TeacherInfoServlet?id=update" target="result" onclick="$('div#result').load(this.href);return false;">修改个人信息</a></li>
</ul>
</li>
<li>
<div class="link">课程信息管理</div>
<ul class="submenu">
<li><a onclick="show_insert_course()">新增选课信息</a></li>
<li><a onclick="show_course_teacher()">查看课程信息</a></li>
</ul>
</li>
</ul>
</div>
<div id="result" class="result">
<p class="welcome">欢迎使用学生选课管理系统！</p>
</div>
</div>
</main> <footer>
<div class="copyright">
© Copyright. All rights reserved. Design by <a href="http://www.github.com/Soarkey/">Soarkey</a>
</div>
</footer> <script src="js/jquery-3.1.1.min.js"></script>
<script src="js/admin.js"></script>
</body>
</html>
T_Home.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<link rel="stylesheet"
href="http://jqueryvalidation.org/files/demo/site-demos.css"> <script
src="http://static.runoob.com/assets/jquery-validation-1.14.0/lib/jquery.js"></script>
<script
src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/jquery.validate.min.js"></script>
<script
src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/localization/messages_zh.js"></script>
<script type="text/javascript">
$().ready(function() {
$("#myform").validate({/*表单信息验证*/
rules : {
username : "required",
No : {
required : true,
digits : true
},
age : {
required : true,
digits : true
},
collage : "required",
department : "required",
password : "required",
password_2 : {
required : true,
equalTo : "#password"
}
},
messages : {
username : {
required : "请输入姓名",
},
No : {
required : "请输入学号",
digits : "只能输入数字串",
},
age : {
required : "请输入年龄",
digits : "只能输入数字串",
},
collage : {
required : "请输入所在学院",
},
department : {
required : "请输入所在专业",
},
password : {
required : "请输入密码",
},
password_2 : {
required : "请确认密码",
equalTo : "两次密码输入不一致",
}
}
});
});
</script>
</head>
<body>
<form
action="${pageContext.request.contextPath}/UpdateTeacherInfoServlet"
method="post" id="myform">
<h3> 修改教师信息：</h3>
<table width="650px" border="1" align="center" cellpadding="2"
cellspacing="2">
<tr>
<td width="150px" align="center">身 份：</td>
<td>教 师</td>
</tr>
<tr>
<td width="150px" align="center"><label for="No">工
号：</label></td>
<td>${t.getTNo()}</td>
</tr>
<tr>
<td width="150px" align="center"><label for="username">姓 名：</label></td>
<td><input type="text" name="username" size="19" id="username"
value="${t.getTName()}" /></td>
</tr>
<tr>
<td width="150px" align="center">性 别：</td>
<td><input type="radio" name="sex" value='男' checked>男
<input type="radio" name="sex" value='女'>女</td>
</tr>
<tr>
<td width="150px" align="center"><label for="age">专 业：</label></td>
<td><input type="text" name="major" size="19" id="age"
value="${t.getTMajor()}" /></td>
</tr>
<tr>
<td width="150px" align="center"><label for="collage">职 称：</label></td>
<td><input type="text" name="level" size="19" id="collage"
value="${t.getTLevel()}" /></td>
</tr>
<tr>
<td width="150px" align="center"><label for="password">新
密 码：</label></td>
<td><input id="password" name="password" type="password"
size="20"></td>
</tr>
<tr>
<td width="150px" align="center"><label for="password_2">确认新密码：</label></td>
<td><input type="password" name="password_2" size="20"
id="password_2" /></td>
</tr>
<tr>
<td align="center" colspan="2"><input type="submit"
value="确认修改"></td>
</tr>
<tr>
<td colspan="2">
<font color="red">${message}</font>
</td>
</tr>
</table>
</form>
</body>
</html>
UpdateTeacherInfo.jsp
后台代码：
因为大部分代码都大同小异，只展示选课部分的代码
package servlet; import java.io.IOException;
import java.util.ArrayList;
import java.util.List; import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import bean.Course;
import service.CService;
import service.EService; /**
* Servlet implementation class MyCourseServlet
*/
@WebServlet("/ElectCourseServlet")
public class ElectCourseServlet extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public ElectCourseServlet() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String id = request.getParameter("id");
if (id.equals("seekall")) {// 查询所有课程分配
List<Course> list = new ArrayList<>();
list = new CService().seekAll_C(list);
request.setAttribute("list", list); // 把list储存在request对象中
request.getRequestDispatcher("/jsp/course/ElectCourse.jsp").forward(request, response);// 转到/AllBookInfo.jsp页面
} else if (id.equals("elect")) {// 选课
String cNo = request.getParameter("No"); //
String sNo = (String) request.getSession().getAttribute("UNAME");
String message = "";
message = new EService().elect_C(cNo, sNo, message);
if (message == null || message.equals("")) {
request.getSession().setAttribute("message", "选课成功！");
} else {
request.getSession().setAttribute("message", message); }
request.getSession().setAttribute("url", "ElectCourseServlet?id=seekall");
response.sendRedirect("Message.jsp");
}
} /**
* @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);
} }
ElectCourseServlet.java
package service; import java.util.ArrayList;
import java.util.List; import bean.Course;
import bean.Student;
import dao.ElectCSql;
import dao.MinusResidueNumSql;
import dao.SeekElectedSql;
import service.CService;
import service.SService; public class EService {
public String elect_C(String cNo, String sNo, String message) {
List<Course> list = new ArrayList<>();
list = new CService().seek_C("编号", "精确查询", cNo, list);// 根据课程编号获得课程名称
String cname = ((Course) list.toArray()[0]).getCName();
String tname = ((Course) list.toArray()[0]).getCTeacher();
List<Student> list2 = new ArrayList<>();
list2 = new SService().seek_S("学号", "精确查询", sNo, list2);// 根据学号获得姓名
String sname = ((Student) list2.toArray()[0]).getSName();
Boolean bool = new SeekElectedSql().seekExist_Sql(cNo, sNo);// 判断该课是否选过
if (bool == true) {
message = "该课已选，请选其它课";
bool = false;
} else if (bool == false) {
Boolean bool2 = new MinusResidueNumSql().seekResidueNum_Sql(cNo);// 判断可选人数，并修改
if (bool2 == true) {
bool = new ElectCSql().electC_Sql(cNo, cname, sNo, sname,tname);// 根据课程编号和学号选课
} else if (bool2 == false) {
message = "该班学生已满，请选其它课";
}
}
return message;
}
}
EService.java
package dao; import java.sql.Connection;
import java.sql.PreparedStatement; import database.MysqlLinking; public class ElectCSql {
public Boolean electC_Sql(String cNo, String cname, String sNo, String sname,String tname) {
(new MysqlLinking()).getLink();// 连接数据库
Connection conn = MysqlLinking.conn;// 得到连接数据库的Connection对象
Boolean bool = false;
if (conn != null) {
try {
// 插入注册信息的SQL语句(使用?占位符) //添加选课信息
String sql = "insert into electcourse (C_No,S_No,T_Name,C_Name,S_Name) values(?,?,?,?,?)";
// 创建PreparedStatement对象
PreparedStatement ps = conn.prepareStatement(sql);
// 对SQL语句中的参数动态赋值
ps.setString(1, cNo);
ps.setString(2, sNo);
ps.setString(3, tname);
ps.setString(4, cname);
ps.setString(5, sname);
// 执行更新操作
int count = ps.executeUpdate();
if (count >= 1) {
bool = true;
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
// 发送数据库连接错误提示信息
System.out.println("数据库连接错误！");
}
return bool;
}
}
ElectCSql
package dao; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet; import database.MysqlLinking; public class MinusResidueNumSql {
public Boolean seekResidueNum_Sql(String cNo) {
(new MysqlLinking()).getLink();// 连接数据库
Connection conn = MysqlLinking.conn;// 得到连接数据库的Connection对象
Boolean bool = false;
if (conn != null) {
try {
String sql = "select * from course where C_No=?"; // 根据课程编号查询课程的可选人数
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, cNo);
ResultSet rs = ps.executeQuery();
int residueNum = 0;
while (rs.next()) {
residueNum = Integer.valueOf(rs.getString("C_ResidueNum"));
}
if (residueNum > 0) {
try {
String sql_2 = "update course set C_ResidueNum=? where C_No=?";
PreparedStatement ps_2 = conn.prepareStatement(sql_2);
int re = residueNum - 1;// 课程可选人数减一
ps_2.setString(1, String.valueOf(re));
ps_2.setString(2, cNo);
int count = ps_2.executeUpdate();
if (count >= 1) {
bool = true;
}
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
// 发送数据库连接错误提示信息
System.out.println("数据库连接错误！");
}
return bool;
}
}
MinusResidueNumSql
package dao; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.List; import bean.Course;
import database.MysqlLinking; public class SeekCSql {
public List<Course> seekC_Sql(String select, String seek, String name, List<Course> list) {
(new MysqlLinking()).getLink();// 连接数据库
Connection conn = MysqlLinking.conn;// 得到连接数据库的Connection对象
if (conn != null) {
try {
String sql = "";
PreparedStatement ps = null;
if (seek.equals("模糊查询")) {// 条件查询课程
sql = "select * from course where " + select + " like '%" + name + "%'";
ps = conn.prepareStatement(sql);
} else if (seek.equals("精确查询")) {
sql = "select * from course where " + select + "=?";
// 创建PreparedStatement对象
ps = conn.prepareStatement(sql);
ps.setString(1, name);
}
ResultSet rs = ps.executeQuery(); while (rs.next()) {
Course c = new Course();
c.setCNO(rs.getString("C_No"));
c.setCName(rs.getString("C_Name"));
c.setCTeacher(rs.getString("C_Teacher"));
list.add(c);
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
// 发送数据库连接错误提示信息
System.out.println("数据库连接错误！");
}
return list;
}
}
SeekCSql.java
package dao; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet; import database.MysqlLinking; public class SeekElectedSql {
public Boolean seekExist_Sql(String cNo, String sNo) {
(new MysqlLinking()).getLink();// 连接数据库
Connection conn = MysqlLinking.conn;// 得到连接数据库的Connection对象
Boolean bool = false;
if (conn != null) {
try {
// 插入注册信息的SQL语句(使用?占位符)
String sql = "select * from electcourse where C_No=? and S_No=?";// 根据课程编号和学号判断该课是否已选
// 创建PreparedStatement对象
PreparedStatement ps = conn.prepareStatement(sql);
// 对SQL语句中的参数动态赋值
ps.setString(1, cNo);
ps.setString(2, sNo);
// 执行更新操作
ResultSet rs = ps.executeQuery();
while (rs.next()) {
bool = true;
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
// 发送数据库连接错误提示信息
System.out.println("数据库连接错误！");
}
return bool;
}
}
SeekElectedSql.java
整体项目结构如图：
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