JavaWeb项目-选课系统

1、项目需求：

本项目所开发的学生选课系统完成学校对学生的选课信息的统计与管理，减少数据漏掉的情况，同时也节约人力、物力和财力。告别以往的人工统计。

2.系统要求与功能设计

2.1 页面要求

（1）能够在Tomcat服务器中正确部署，并通过浏览器查看；

（2）网站页面整体风格统一；

（3）首页(登录页)要求实现不同用户登录后，进入的功能页不相同。

（4）教师功能页：有添加课程、修改个人信息、浏览选课学生信息三个模块。

（5）学生功能页：有修改个人信息、浏览课程信息、选课三个功能模块。

（5）管理员功能页：有添加教师信息、添加学生信息两个模块。

2.2功能要求：

（1）添加教师信息：管理员可以添加教师基本信息，教师基本信息包括：教师工号（八位数字组成，例如02000081）、教师姓名、教师性别、教师所在学院、职称（教授、副教授、讲师、助教）组成；

（2）添加学生信息：管理可以添加学生基本信息，学生基本信息包括学号（八位数字组成，例如20180052）、学生姓名、学生性别、所在班级、所属专业组成；

（3）添加课程信息：教师登陆后，可以添加自己任职的课程基本信息，课程基本信息包括：课程编号（六位数字组成，例如050013），课程名称、选课人数、任课教师（任课教师不需录入，那位教师填写课程信息，那位教师就是任课教师）；

（4）修改个人信息：教师或学生登陆后可以修改个人信息，但教师工号或学号不能修改，另外教师或学生只能修改自己的信息，无法看到或修改其他学生或教师的基本信息。

（5）浏览课程信息：学生登陆后可以看到所有课程的列表信息，点击课程名称可以查看课程的详细信息,包括已选课人数；点击教师名称可以查看教师的详细信息。

（6）选课：进入选课页面，课程信息列表显示所有选课人数未达到课程设置的选课人数上限，点击课程名称可以看到课程详细信息，点击课程详细信息页面的“选课”按钮，可以实现选课功能。

（7）浏览选课学生信息：教师进入该页面后，可以看到自己设置的课程信息列表，点击课程名称，可以看到，选择该课程的所有学生基本信息列表。

（8）登陆功能：管理员、教师、学生登陆后可以看到不同的功能页面，教师或学生登陆后只能看到自己的相关信息，不同教师、不同学生登陆后无法查看其他人的信息。（要求至少创建两个教师用户、十个学生用户演示选课过程）

3数据库设计：

要求实现课程基本信息表、教师基本信息表、学生基本信息表、选课基本信息表。（提示：选课基本信息包括课程编号、教师编号、学号等基本信息）

4、WEB发布：

要求可以实现在浏览器直接访问系统。

源代码

package test1;
import java.sql.*;
import java.util.regex.Pattern;

public class Data {
    //common
    private String userid;
    private String password;
    private String name;
    private String sex;
    //teacher
    private String school;
    private String rank;
    //student
    private String classe;
    private String object;
    //ideas
    public String getUserid() {
        return userid;
    }
    public void setUserid(String userid) {
        this.userid = userid;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getSchool() {
        return school;
    }
    public void setSchool(String school) {
        this.school = school;
    }
    public String getRank() {
        return rank;
    }
    public void setRank(String rank) {
        this.rank = rank;
    }
    public String getClasse() {
        return classe;
    }
    public void setClasse(String classe) {
        this.classe = classe;
    }
    public String getObject() {
        return object;
    }
    public void setObject(String object) {
        this.object = object;
    }
    //class data;
    private String classid;
    private String classname;
    private String classpup;
    private String classpupnow;
    private String classteacher;
    //ideas
    public String getClassid() {
        return classid;
    }
    public void setClassid(String classid) {
        this.classid = classid;
    }
    public String getClassname() {
        return classname;
    }
    public void setClassname(String classname) {
        this.classname = classname;
    }
    public String getClasspup() {
        return classpup;
    }
    public void setClasspup(String classpup) {
        this.classpup = classpup;
    }
    public String getClasspupnow() {
        return classpupnow;
    }
    public void setClasspupnow(String classpupnow) {
        this.classpupnow = classpupnow;
    }
    public String getClassteacher() {
        return classteacher;
    }
    public void setClassteacher(String classteacher) {
        this.classteacher = classteacher;
    }
    //连接数据库***********************************************************************
    public Connection getConnection()//连接数据库
    {
        try{
            Class.forName("com.mysql.cj.jdbc.Driver");
            //System.out.println("加载驱动成功");
        }catch(ClassNotFoundException e)
        {
            e.printStackTrace();
        }
        String user="root";
        String password="123456";
        String url = "jdbc:mysql://localhost:3306/ztest01?useSSL=false&serverTimezone=GMT&characterEncoding=utf-8&autoReconnect=true";
        Connection con=null;
        try{
            con=DriverManager.getConnection(url,user,password);
            //System.out.println("数据库连接成功");
        }catch(SQLException e)
        {
            e.printStackTrace();
        }
        return con;
    }
    //关闭方法**********************************************************************
     public  void close (Connection con)
        {
            try{
                if(con!=null)
                {
                    con.close();
                }
            }catch(SQLException e)
                {
                    e.printStackTrace();
                }
        }
     public  void close (PreparedStatement preparedStatement)
     {
            try{
                if(preparedStatement!=null)
                {
                    preparedStatement.close();
                }
            }catch(SQLException e)
            {
                e.printStackTrace();
            }
      }
     public  void close(ResultSet resultSet)
      {
            try{
                if(resultSet!=null)
                {
                    resultSet.close();
                }
            }catch(SQLException e)
            {
                e.printStackTrace();
            }
       }
    //数据库操作*******************************************************************
        public void addstudent(String userid,String name,String sex,String classe,String object,String password)//add student
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;       
            try {
                String sql = "insert into students (userid,name,sex,classe,object,password) values (?,?,?,?,?,?)";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,userid);
                preparedStatement.setString(2,name);
                preparedStatement.setString(3,sex);
                preparedStatement.setString(4,classe);
                preparedStatement.setString(5,object);
                preparedStatement.setString(6,password);
                preparedStatement.executeUpdate();
                
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }
        }
        public void addteacher(String userid,String name,String sex,String school,String ranks,String password)//add teacher
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;       
            try {
                String sql = "insert into teachers (userid,name,sex,school,ranks,password) values (?,?,?,?,?,?)";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,userid);
                preparedStatement.setString(2,name);
                preparedStatement.setString(3,sex);
                preparedStatement.setString(4,school);
                preparedStatement.setString(5,ranks);
                preparedStatement.setString(6,password);
                preparedStatement.executeUpdate();
                
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }
        }
        
        public void reviseteacher(String userid,String name,String sex,String school,String ranks)//revise teacher
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;       
            try {
                String sql = "update teachers set name=?, sex=?, school=?, ranks=? where userid=?";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,name);
                preparedStatement.setString(2,sex);
                preparedStatement.setString(3,school);
                preparedStatement.setString(4,ranks);
                preparedStatement.setString(5,userid);
                preparedStatement.executeUpdate();
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }    
        }
        public void revisestudent(String userid,String name,String sex,String classe,String object)//revise student
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;       
            try {
                String sql = "update students set name=?, sex=?, classe=?, object=? where userid=?";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,name);
                preparedStatement.setString(2,sex);
                preparedStatement.setString(3,classe);
                preparedStatement.setString(4,object);
                preparedStatement.setString(5,userid);
                preparedStatement.executeUpdate();
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }    
        }
        
        public void addclass(String classid,String classname,String classpup,String classpupnow,String classteacher,String teacherid) //add class
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;       
            try {
                String sql = "insert into classes (classid,classname,classpup,classpupnow,classteacher,teacherid) values (?,?,?,?,?,?)";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,classid);
                preparedStatement.setString(2,classname);
                preparedStatement.setString(3,classpup);
                preparedStatement.setString(4,classpupnow);
                preparedStatement.setString(5,classteacher);
                preparedStatement.setString(6,teacherid);
                preparedStatement.executeUpdate();
                
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }
        }
        public void addBeChosenClass(String studentid,String classid,String classpupnow,String teacherid) { //classpupnow++
            Connection connection = getConnection();
            PreparedStatement preparedStatement1=null;
            PreparedStatement preparedStatement2=null;
            try {
                String sql1 = "insert into beChosenClasses (studentid,classid,teacherid) values (?,?,?)";
                preparedStatement1=connection.prepareStatement(sql1);
                preparedStatement1.setString(1,studentid);
                preparedStatement1.setString(2,classid);
                preparedStatement1.setString(3,teacherid);
                String sql2 = "update classes set classpupnow=? where classid=?";
                preparedStatement2=connection.prepareStatement(sql2);
                preparedStatement2.setString(1,classpupnow);
                preparedStatement2.setString(2,classid);
                
                preparedStatement1.executeUpdate();
                preparedStatement2.executeUpdate();
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement1);
                close(preparedStatement2);
                close(connection);
            }            
        }
        public void changepasswordStudent(String userid,String password) { //change password student
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;
            try {
                String sql = "update students set password=? where userid=?";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,password);
                preparedStatement.setString(2,userid);
                preparedStatement.executeUpdate();
            } catch (SQLException  e) { 
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }    
        }
        
        public void changepasswordTeacher(String userid,String password) { //change password teacher
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;
            try {
                String sql = "update teachers set password=? where userid=?";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,password);
                preparedStatement.setString(2,userid);
                preparedStatement.executeUpdate();
            } catch (SQLException  e) { 
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }    
        }
    
    //判断*********************************************************************************
        public boolean isNumber(String str) {//judge int
            Pattern pattern = Pattern.compile("^[-\+]?[\d]*$");
            return pattern.matcher(str).matches();
        }
        
        public boolean teacherexist(String userid) { //have this teacher
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select userid from teachers";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( userid.equals(rs.getObject(1)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        public boolean studentexist(String userid) { //have this student
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select userid from students";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( userid.equals(rs.getObject(1)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        public boolean useridisIdRight(String num) {//judge userid
            int k=0;
            if(num.length()==8) {
                for(int i=0;i<8;i++) {
                    char c=num.charAt(i);
                    if(c=='0'||c=='1'||c=='2'||c=='3'||c=='4'||c=='5'||c=='6'||c=='7'||c=='8'||c=='9')
                        k++;
                }
                if(k==8) 
                    return true;
                else return false;
            }
            else return false;
        }
        public boolean classidisIdRight(String num) {//judge classid
            int k=0;
            if(num.length()==6) {
                for(int i=0;i<6;i++) {
                    char c=num.charAt(i);
                    if(c=='0'||c=='1'||c=='2'||c=='3'||c=='4'||c=='5'||c=='6'||c=='7'||c=='8'||c=='9')
                        k++;
                }
                if(k==6) 
                    return true;
                else return false;
            }
            else return false;
        }
        
        public boolean passwordIsRightStudents(String userid,String password) { //judge password is right-Students
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select * from students";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( userid.equals(rs.getObject(1))&&password.equals(rs.getObject(6)) )
                            return true;
                }           
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        public boolean passwordIsRightTeachers(String userid,String password) { //judge password is right-Teachers
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select * from teachers";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( userid.equals(rs.getObject(1))&&password.equals(rs.getObject(6)) )
                            return true;
                }           
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        public boolean passwordIsRightOp(String userid,String password) { //judge password is right-Op
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select * from ops";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( userid.equals(rs.getObject(1))&&password.equals(rs.getObject(2)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        public boolean classIsExist(String classid) {  //have this class
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select classid from classes";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( classid.equals(rs.getObject(1)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;     
        }
        public boolean classSame(String studentid,String classid) { //student have chosen this class
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select * from bechosenclasses";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( studentid.equals(rs.getObject(1))&&classid.equals(rs.getObject(2)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;     
        }

    
    //*********************************************************************************
    public static void main(String[] args) {
        
    }

}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="loginjudge.jsp" method="get">
            <br>石家庄铁道大学选课管理系统<br>
            <br> 用户名: <input type="text" name="userid" /><br>
            <br> 密  码: <input type="password" name="password" /><br>
            <br>
            (密码默认为用户名)
            <br>
            <input type="radio" name="usertype" value="teacher" />教师  
            <input type="radio" name="usertype" value="student" />学生
            <input type="radio" name="usertype" value="op" />管理员
            <br>
            <br> <input type="submit" value="登录" />  
                 <input type="reset" value="重置" />  
            <br>
</form>
</body>
</html>

<%@page import="com.mysql.cj.util.Util"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)request.getParameter("userid");
session.setAttribute("userid",userid);
String password=(String)request.getParameter("password");
String usertype=(String)request.getParameter("usertype");
if(usertype==null||userid==""||password=="")
{
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else{
if(usertype.equals("teacher"))//teacher login
{
    if(!util.teacherexist(userid)){
        out.print("<script language='javaScript'> alert('该教师不存在');window.history.back(-1);</script>");
    }
    else if(!util.passwordIsRightTeachers(userid, password)){
        out.print("<script language='javaScript'> alert('密码不正确');window.history.back(-1);</script>");
    }
    else{
           out.print("<script language='javaScript'> alert('登录成功');</script>");
           response.setHeader("refresh", "0;url=teacher.jsp");
    }
}
else if(usertype.equals("student"))//student login
{
    if(!util.studentexist(userid)){
        out.print("<script language='javaScript'> alert('该学生不存在');window.history.back(-1);</script>");
    }
    else if(!util.passwordIsRightStudents(userid, password)){
        out.print("<script language='javaScript'> alert('密码不正确');window.history.back(-1);</script>");
    }
    else{
        out.print("<script language='javaScript'> alert('登录成功');</script>");
        response.setHeader("refresh", "0;url=student.jsp");
    }
}
else if(usertype.equals("op")) //op login
{
    if(!util.passwordIsRightOp(userid, password)){
        out.print("<script language='javaScript'> alert('用户名或密码不正确');window.history.back(-1);</script>");
    }
    else{
         out.print("<script language='javaScript'> alert('登录成功');</script>");
            response.setHeader("refresh", "0;url=op.jsp");
    }
}
}
%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>管理员</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
    <br>
    <br>
    <input type="button" value="添加教师信息" onclick="location.href='opteacher.jsp'" />
    <input type="button" value="添加学生信息" onclick="location.href='opstudent.jsp'" />
    <br>
    <br>
    <input type="button" value="退出登录" onclick="location.href='login.jsp'" />
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加学生</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="opstudent2.jsp" method="get">
    添加学生
    <br>
    <br>
    <br> 学生学号 <input type="text" name="userid"  /><br>
    <br> 学生姓名 <input type="text" name="name" /><br>
    <br> 性别 <input type="radio" name="sex" value="男" />男  
        <input type="radio" name="sex" value="女" />女
    <br>
    <br> 班 级 <input type="text" name="classe"  /><br>
    <br> 专 业 <input type="text" name="object"  /><br>
    <br>
    <br>
    <br><input type="submit" value="提交" /> 
        <input type="reset" value="重置" />  <br>
    <br> <input type="button" value="返回菜单" onclick="location.href='op.jsp'" /> <br>
</form>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)request.getParameter("userid");
String name=(String)request.getParameter("name");
String sex=(String)request.getParameter("sex");
String classe=(String)request.getParameter("classe");
String object=(String)request.getParameter("object");
if(userid==""||name==""||sex==null||classe==""||object=="")
{
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else if(!util.useridisIdRight(userid)){
    out.print("<script language='javaScript'> alert('学号应该为8位数字');window.history.back(-1);</script>");
}
else{
    util.addstudent(userid, name, sex, classe, object,userid);
    out.print("<script language='javaScript'> alert('添加成功');</script>");
    response.setHeader("refresh", "0;url=opstudent.jsp");
}

%>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加教师</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="opteacher2.jsp" method="get">
    添加教师
    <br>
    <br>
    <br> 教师工号 <input type="text" name="userid"  /><br>
    <br> 教师姓名 <input type="text" name="name" /><br>
    <br>性别 <input type="radio" name="sex" value="男" />男  
        <input type="radio" name="sex" value="女" />
    <br>
    <br> 学院 <input type="text" name="school" /><br>
    职称 
    <select  name="ranks"> 
    <option selected="selected"></option>
    <option value="教授">教授</option>
    <option value="副教授">副教授</option>
    <option value="讲师">讲师</option>
    <option value="助教">助教</option>
    </select>
    <br>
    <br>
    <br><input type="submit" value="提交" /> 
        <input type="reset" value="重置" />  <br>
    <br> <input type="button" value="返回菜单" onclick="location.href='op.jsp'" /> <br>
</form>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)request.getParameter("userid");
String name=(String)request.getParameter("name");
String sex=(String)request.getParameter("sex");
String school=(String)request.getParameter("school");
String ranks=(String)request.getParameter("ranks");
if(userid==""||name==""||sex==null||school==""||ranks=="")
{
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else if(!util.useridisIdRight(userid)){
    out.print("<script language='javaScript'> alert('工号应该为8位数字');window.history.back(-1);</script>");
}
else{
    util.addteacher(userid, name, sex, school, ranks, userid);
    out.print("<script language='javaScript'> alert('添加成功');</script>");
    response.setHeader("refresh", "0;url=opteacher.jsp");
}

%>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>学生</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="studentrevise.jsp" method="get">
    <br>
    <input type="button" value="修改密码" onclick="location.href='studentrevisepassword.jsp'" />
    <input type="submit" value="修改个人信息"/>
    <input type="button" value="浏览课程信息" onclick="location.href='studentwatchclasses.jsp'" />
    <input type="button" value="选课" onclick="location.href='studentselect.jsp'" />
    <br>
    <br>
    <input type="button" value="退出登录" onclick="location.href='login.jsp'" />
</form>
</body>
</html>

<%@ page language="java" import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改学生个人信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>工号</td>
        <td align="center" width=10%>姓名</td>
        <td align="center" width=10%>性别</td>
        <td align="center" width=10%>班级</td>
        <td align="center" width=10%>专业</td>
        </tr>
        <%
        String userid=(String)session.getAttribute("userid");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from students";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if(userid.equals(rs.getObject(1)))
                {
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"><%=rs.getObject(5) %></td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
<form action="studentrevise2.jsp" method="get">
    修改信息
    <br>
    <br> 学生姓名 <input type="text" name="name" size="4"/><br>
    <br>性别 <input type="radio" name="sex" value="男" />男  
        <input type="radio" name="sex" value="女" />女
    <br>
    <br> 班 级 <input type="text" name="classe" /><br>
    <br> 专 业 <input type="text" name="object" /><br>
    <br>
    <br>
    <br><input type="submit" value="提交" /> 
        <input type="reset" value="重置" />  <br>
    <br> <input type="button" value="返回菜单" onclick="location.href='student.jsp'" /> <br>
</form>


</body>
</html>

<%@ 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>
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)session.getAttribute("userid");
String name=(String)request.getParameter("name");
String sex=(String)request.getParameter("sex");
String classe=(String)request.getParameter("classe");
String object=(String)request.getParameter("object");
if(name==""||sex==null||classe==""||object=="")
{
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else{
    util.revisestudent(userid, name, sex, classe, object);
    out.print("<script language='javaScript'> alert('修改成功');</script>");
    response.setHeader("refresh", "0;url=studentrevise.jsp");
}

%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改密码</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="studentrevisepasswordconfirm.jsp" method="get">
            <br> 新密码:   <input type="password" name="password1" /><br>
            <br> 确认新密码: <input type="password" name="password2" /><br>
            <br> <input type="submit" value="确定" />  
                 <input type="reset" value="重置" />  
            <br>
                <br> <input type="button" value="返回菜单" onclick="location.href='student.jsp'" /> <br>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)session.getAttribute("userid");
String password1=(String)request.getParameter("password1");
String password2=(String)request.getParameter("password2");
if(!password1.equals(password2)){
    out.print("<script language='javaScript'> alert('两次输入不一致');window.history.back(-1);</script>");
}
else{
    util.changepasswordStudent(userid, password2);
    out.print("<script language='javaScript'> alert('修改成功');</script>");
    response.setHeader("refresh", "0;url=student.jsp");
}
%>

</body>
</html>

<%@ page language="java" import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>选课</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>课程编号</td>
        <td align="center" width=10%>课程名称</td>
        <td align="center" width=10%>教师</td>
        </tr>
        <%
        String userid=(String)session.getAttribute("userid");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from classes";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if( ((int)(rs.getObject(3)) > (int)(rs.getObject(4)))&& !util.classSame(userid, rs.getObject(1).toString()  )  ) {
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><a style="color:white" href='studentselect2.jsp?classid=<%=rs.getObject(1) %>'><%=rs.getObject(2) %></a> </td>
                <td align="center"><%=rs.getObject(5) %></td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回菜单" onclick="location.href='student.jsp'" /> <br>
</body>
</html>

<%@ page language="java" import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>课程详细信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String classid=(String)request.getParameter("classid");
%>
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>课程编号</td>
        <td align="center" width=10%>课程名称</td>
        <td align="center" width=10%>选课人数上限</td>
        <td align="center" width=10%>当前选课人数</td>
        <td align="center" width=10%>教师</td>
        <td align="center" width=10%>选课</td>
        </tr>
        <%
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from classes";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if(classid.equals(rs.getObject(1))){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"><%=rs.getObject(5) %></td>
                <td align="center"><a style="color:white" href='studentselectjudge.jsp?classid=<%=rs.getObject(1) %>&classpupnow=<%=rs.getObject(4) %>&teacherid=<%=rs.getObject(6) %>'>选课</a> </td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>

        <input type="button" value="返回" onclick="location.href='studentselect.jsp'" /><br>
</body>
</html>

<%@ 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>
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String studentid=(String)session.getAttribute("userid");
String classid=(String)request.getParameter("classid");
String classpupnow0=(String)request.getParameter("classpupnow");
String classpupnow= Integer.toString(Integer.parseInt(classpupnow0)+1);
String teacherid=(String)request.getParameter("teacherid");
util.addBeChosenClass(studentid, classid, classpupnow,teacherid);
out.print("<script language='javaScript'> alert('选课成功');</script>");
response.setHeader("refresh", "0;url=studentselect.jsp");
%>
</body>
</html>

<%@ page language="java"  import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>浏览课程信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>课程编号</td>
        <td align="center" width=10%>课程名称</td>
        <td align="center" width=10%>教师</td>
        </tr>
        <%
        String userid=(String)session.getAttribute("userid");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from classes";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><a style="color:white" href='studentwatchclassesclass.jsp?classid=<%=rs.getObject(1) %>'><%=rs.getObject(2) %></a> </td>
                <td align="center"><a style="color:white" href='studentwatchclassesteacher.jsp?userid=<%=rs.getObject(6) %>'><%=rs.getObject(5) %></a> </td>
                </tr>
                <%
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回菜单" onclick="location.href='student.jsp'" /> <br>
</body>
</html>

<%@ page language="java" import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>课程详细信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String classid=(String)request.getParameter("classid");
%>
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>课程编号</td>
        <td align="center" width=10%>课程名称</td>
        <td align="center" width=10%>选课人数上限</td>
        <td align="center" width=10%>当前选课人数</td>
        <td align="center" width=10%>教师</td>
        </tr>
        <%
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from classes";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if(classid.equals(rs.getObject(1))){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"><%=rs.getObject(5) %></td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回" onclick="location.href='studentwatchclasses.jsp'" /> <br>
</body>
</html>

<%@ page language="java" import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>教师详细信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)request.getParameter("userid");
%>
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>工号</td>
        <td align="center" width=10%>姓名</td>
        <td align="center" width=10%>性别</td>
        <td align="center" width=10%>学院</td>
        <td align="center" width=10%>职称</td>
        </tr>
        <%
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from teachers";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if(userid.equals(rs.getObject(1))){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"><%=rs.getObject(5) %></td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回" onclick="location.href='studentwatchclasses.jsp'" /> <br>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>教师</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="teacherrevise.jsp" method="get">
    <br>
    <input type="button" value="修改密码" onclick="location.href='teacherrevisepassword.jsp'" />
    <input type="submit" value="修改个人信息" />    
    <input type="button" value="添加课程信息" onclick="location.href='teacheradd.jsp'" />
    <input type="button" value="浏览选课学生信息" onclick="location.href='teachershow.jsp'" />
    <br>
    <br>
    <input type="button" value="退出登录" onclick="location.href='login.jsp'" />
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加课程信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="teacheraddjudge.jsp" method="get">
            <br>添加课程信息<br>
            <br> 课程编号: <input type="text" name="classid" /><br>
            <br> 课程名称: <input type="text" name="classname" /><br>
            <br> 选课人数上限: <input type="text" name="classpup" /><br>
            <br> <input type="submit" value="添加" />  
                 <input type="reset" value="重置" />  
            <br>
            <br> <input type="button" value="返回菜单" onclick="location.href='teacher.jsp'" /> <br>
</form>
</body>
</html>

<%@ page language="java"  import="java.sql.*"  contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String classid=(String)request.getParameter("classid");
String classname=(String)request.getParameter("classname");
String classpup=(String)request.getParameter("classpup");
String classteacher="";
String userid=(String)session.getAttribute("userid");

Connection connection = util.getConnection();
PreparedStatement preparedStatement=null; 
ResultSet rs=null;
try {
    String sql = "select * from teachers";
    preparedStatement=connection.prepareStatement(sql);
    rs=preparedStatement.executeQuery();
    while(rs.next()){
        if(userid.equals(rs.getObject(1))) {
            classteacher = (String)rs.getObject(2);
        }
    }
} catch (SQLException  e) {
    e.printStackTrace();
}finally{
    util.close(rs);
    util.close(preparedStatement);
    util.close(connection);
}


if(classid==""||classname==""||classpup==""){
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else if(!util.classidisIdRight(classid)){
    out.print("<script language='javaScript'> alert('课程编号应该为六位数字');window.history.back(-1);</script>");
}
else if(!util.isNumber(classpup)){
    out.print("<script language='javaScript'> alert('课程人数上限应该为整数');window.history.back(-1);</script>");
}
else if(util.classIsExist(classid)){
    out.print("<script language='javaScript'> alert('课程已存在');window.history.back(-1);</script>");
}
else {
    util.addclass(classid, classname, classpup, "0", classteacher,userid);
    out.print("<script language='javaScript'> alert('添加成功');</script>");
    response.setHeader("refresh", "0;url=teacheradd.jsp");
}
%>
</body>
</html>

<%@ page language="java" import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改教师个人信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>工号</td>
        <td align="center" width=10%>姓名</td>
        <td align="center" width=10%>性别</td>
        <td align="center" width=10%>学院</td>
        <td align="center" width=10%>职称</td>
        </tr>
        <%
        String userid=(String)session.getAttribute("userid");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from teachers";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if(userid.equals(rs.getObject(1)))
                {
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"><%=rs.getObject(5) %></td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>

</table>
</div>
<form action="teacherrevise2.jsp" method="get">
    修改信息
    <br>
    <br> 姓名 <input type="text" name="name" size="4"/><br>
    <br> 性别 <input type="radio" name="sex" value="男" />男  
        <input type="radio" name="sex" value="女" />女
    <br>
    <br> 所在学院 <input type="text" name="school" /><br>
    <br>
    职称 
    <select  name="ranks"> 
    <option selected="selected"></option>
    <option value="教授">教授</option>
    <option value="副教授">副教授</option>
    <option value="讲师">讲师</option>
    <option value="助教">助教</option>
    </select>
    <br>
    <br>
    <br><input type="submit" value="提交" /> 
        <input type="reset" value="重置" />  <br>
    <br> <input type="button" value="返回菜单" onclick="location.href='teacher.jsp'" /> <br>
</form>


</body>
</html>

<%@ 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>
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)session.getAttribute("userid");
String name=(String)request.getParameter("name");
String sex=(String)request.getParameter("sex");
String school=(String)request.getParameter("school");
String ranks=(String)request.getParameter("ranks");
if(name==""||sex==null||school==""||ranks=="")
{
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else{
    util.reviseteacher(userid, name, sex, school, ranks);
    out.print("<script language='javaScript'> alert('修改成功');</script>");
    response.setHeader("refresh", "0;url=teacherrevise.jsp");
}

%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改密码</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="teacherrevisepasswordconfirm.jsp" method="get">
            <br> 新密码:   <input type="password" name="password1" /><br>
            <br> 确认新密码: <input type="password" name="password2" /><br>
            <br> <input type="submit" value="确定" />  
                 <input type="reset" value="重置" />  
            <br>
                <br> <input type="button" value="返回菜单" onclick="location.href='teacher.jsp'" /> <br>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test1.Data" scope="page" />
<%
String userid=(String)session.getAttribute("userid");
String password1=(String)request.getParameter("password1");
String password2=(String)request.getParameter("password2");
if(!password1.equals(password2)){
    out.print("<script language='javaScript'> alert('两次输入不一致');window.history.back(-1);</script>");
}
else{
    util.changepasswordTeacher(userid, password2);
    out.print("<script language='javaScript'> alert('修改成功');</script>");
    response.setHeader("refresh", "0;url=teacher.jsp");
}
%>

</body>
</html>

<%@ page language="java"  import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>浏览选课学生信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>课程编号</td>
        <td align="center" width=10%>课程名称</td>
        <td align="center" width=10%>选课人数上限</td>
        <td align="center" width=10%>当前选课人数</td>
        </tr>
        <%
        String userid=(String)session.getAttribute("userid");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from classes";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if(userid.equals(rs.getObject(6))){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><a style="color:white" href='teachershow2.jsp?classid=<%=rs.getObject(1) %>'><%=rs.getObject(2) %></a> </td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回菜单" onclick="location.href='teacher.jsp'" /> <br>
</body>
</html>

<%@ page language="java"  import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>选课学生信息页面</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test1.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>学生学号</td>
        <td align="center" width=10%>学生姓名</td>
        <td align="center" width=10%>性别</td>
        <td align="center" width=10%>班级</td>
        <td align="center" width=10%>专业</td>
        </tr>
        <%
        String teacherid=(String)session.getAttribute("userid");
        String classid=(String)request.getParameter("classid");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from bechosenclasses";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if( classid.equals(rs.getObject(2))&&teacherid.equals(rs.getObject(3)) ){
                    String studentid=rs.getObject(1).toString();
                    PreparedStatement preparedStatement0=connection.prepareStatement("select * from students");
                    ResultSet rs0=preparedStatement0.executeQuery();
                    while(rs0.next()) {
                        if(studentid.equals(rs0.getObject(1))){
                        %>
                        <tr>
                        <td align="center"><%=rs0.getObject(1) %></td>
                        <td align="center"><%=rs0.getObject(2) %></td>
                        <td align="center"><%=rs0.getObject(3) %></td>
                        <td align="center"><%=rs0.getObject(4) %></td>
                        <td align="center"><%=rs0.getObject(5) %></td>
                        </tr>
                        <%
                        }
                    }
                    util.close(rs0);
                    util.close(preparedStatement0);
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回" onclick="location.href='teachershow.jsp'" /> <br>
</body>
</html>