简单的JAVAWeb选课系统

该系统管理员可以添加和删除学生、教师，教师可以修改自己信息、添加课程、浏览自己课程，学生可以修改自己的信息、选课、浏览全部课程。

首先展示文件：

然后就是一次展示代码：

Guanli包中代码：

package Guanli;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import Login.DBUtil;

public class Add {
    public boolean add(String table,AddService en)
    {
        boolean c=false;
        String sql="insert into "+table+"(username,password,power,name) values('"+en.getUsername()+"','"+en.getPassword()+"','"+en.getPower()+"','"+en.getName()+"');";
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try {
            state=conn.createStatement();
            int num=state.executeUpdate(sql);
            if(num!=)
                c=true;

            state.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
        }

        return c;

    }
    public boolean add(String table,TeacherService en)
    {
        boolean c=false;
        String sql="insert into "+table+"(gonghao,xingming,xingbie,xueyuan,zhicheng) values('"+en.getGonghao()+"','"+en.getXingming()+"','"+en.getXingbie()+"','"+en.getXueyuan()+"','"+en.getZhicheng()+"');";
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try {
            state=conn.createStatement();
            int num=state.executeUpdate(sql);
            if(num!=)
                c=true;

            state.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
        }

        return c;

    }
    public boolean add(String table,StudentService en)
    {
        boolean c=false;
        String sql="insert into "+table+"(xuehao,xingming,xingbie,banji,zhuanye) values('"+en.getXuehao()+"','"+en.getXingming()+"','"+en.getXingbie()+"','"+en.getBanji()+"','"+en.getZhuanye()+"');";
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try {
            state=conn.createStatement();
            int num=state.executeUpdate(sql);
            if(num!=)
                c=true;

            state.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
        }

        return c;

    }

}

package Guanli;

import java.sql.Time;
import java.text.SimpleDateFormat;
import java.util.Date;

public class AddService {
    String username;
    String password;
    String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    int power;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getPower() {
        return power;
    }
    public void setPower(int power) {
        this.power = power;
    }

}

package Guanli;

import java.awt.Desktop.Action;
import java.io.IOException;
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 Login.Power;
import Login.Select;

/**
 * Servlet implementation class RegisterServlet
 */
@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegisterServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        Select s=new Select();
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("teacher"))
        {
            AddService as=new AddService();
            Add a=new Add();
            String username;
            username=arg0.getParameter("username");
            as.setUsername(username);
            String password;
            password=arg0.getParameter("password");
            as.setPassword(password);
            int num=1;
            as.setPower(num);

            TeacherService ts=new TeacherService();
            String gonghao;
            gonghao=arg0.getParameter("gonghao");
            ts.setGonghao(gonghao);
            String xingming;
            xingming=arg0.getParameter("xingming");
            ts.setXingming(xingming);
            as.setName(xingming);
            String xingbie;
            xingbie=arg0.getParameter("xingbie");
            ts.setXingbie(xingbie);
            String xueyuan;
            xueyuan=arg0.getParameter("xueyuan");
            ts.setXueyuan(xueyuan);
            String zhicheng;
            zhicheng=arg0.getParameter("zhicheng");
            ts.setZhicheng(zhicheng);
            a.add("login", as);
            a.add("teacher", ts);
                    arg0.setAttribute("message","添加成功");
                    arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);

        }
        if(function.equals("student"))
        {
            AddService as=new AddService();
            Add a=new Add();
            String username;
            username=arg0.getParameter("username");
            as.setUsername(username);
            String password;
            password=arg0.getParameter("password");
            as.setPassword(password);

            int num=2;
            as.setPower(num);

            StudentService ss=new StudentService();
            String xuehao;
            xuehao=arg0.getParameter("xuehao");
            ss.setXuehao(xuehao);
            String xingming;
            xingming=arg0.getParameter("xingming");
            ss.setXingming(xingming);
            as.setName(xingming);
            String xingbie;
            xingbie=arg0.getParameter("xingbie");
            ss.setXingbie(xingbie);
            String banji;
            banji=arg0.getParameter("banji");
            ss.setBanji(banji);
            String zhuanye;
            zhuanye=arg0.getParameter("zhuanye");
            ss.setZhuanye(zhuanye);
            a.add("student", ss);
            a.add("login", as);
            arg0.setAttribute("message","添加成功");
            arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);
        }
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

package Guanli;

public class StudentService {
    String xuehao;
    String xingming;
    String xingbie;
    String banji;
    String zhuanye;
    public String getXuehao() {
        return xuehao;
    }
    public void setXuehao(String xuehao) {
        this.xuehao = xuehao;
    }
    public String getXingming() {
        return xingming;
    }
    public void setXingming(String xingming) {
        this.xingming = xingming;
    }
    public String getXingbie() {
        return xingbie;
    }
    public void setXingbie(String xingbie) {
        this.xingbie = xingbie;
    }
    public String getBanji() {
        return banji;
    }
    public void setBanji(String banji) {
        this.banji = banji;
    }
    public String getZhuanye() {
        return zhuanye;
    }
    public void setZhuanye(String zhuanye) {
        this.zhuanye = zhuanye;
    }
}

package Guanli;

public class TeacherService {
    String gonghao;
    String xingming;
    String xingbie;
    String xueyuan;
    String zhicheng;
    public String getGonghao() {
        return gonghao;
    }
    public void setGonghao(String gonghao) {
        this.gonghao = gonghao;
    }
    public String getXingming() {
        return xingming;
    }
    public void setXingming(String xingming) {
        this.xingming = xingming;
    }
    public String getXingbie() {
        return xingbie;
    }
    public void setXingbie(String xingbie) {
        this.xingbie = xingbie;
    }
    public String getXueyuan() {
        return xueyuan;
    }
    public void setXueyuan(String xueyuan) {
        this.xueyuan = xueyuan;
    }
    public String getZhicheng() {
        return zhicheng;
    }
    public void setZhicheng(String zhicheng) {
        this.zhicheng = zhicheng;
    }
}

Login包里的文件：

package Login;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 数据库连接工具
 * @author Hu
 *
 */
public class DBUtil {

    public static String db_url = "jdbc:mysql://localhost:3306/jianmintest?useSSL=false&serverTimezone=UTC&characterEncoding=UTF-8";
    public static String db_user = "root";
    public static String db_pass = "20183629";

    public static Connection getConn () {
        Connection conn = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");//加载驱动
            conn = DriverManager.getConnection(db_url, db_user, db_pass);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return conn;
    }

    /**
     * 关闭连接
     * @param state
     * @param conn
     */
    public static void close (Statement state, Connection conn) {
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close (ResultSet rs, Statement state, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) throws SQLException {
        Connection conn = getConn();
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        String sql ="select * from course";
        pstmt = conn.prepareStatement(sql);
        rs = pstmt.executeQuery();
        if(rs.next()){
            System.out.println("空");
        }else{
            System.out.println("不空");
        }
    }
}

package Login;

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

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        Select s=new Select();
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("login"))
        {
            String username;
            username=arg0.getParameter("username");
            String password;
            password=arg0.getParameter("password");
            String power;
            power=arg0.getParameter("power");
            int num=Integer.parseInt(power);
            flag=s.select("login", username, password,num);
            Power.setFlag(num);
            if(flag)
            {
                arg0.setAttribute("message","登录成功");
                arg0.getRequestDispatcher("Home.jsp").forward(arg0, arg1);

            }
            else
            {
                arg0.setAttribute("message", "账号或密码有误");
                arg0.getRequestDispatcher("Login.jsp").forward(arg0, arg1);
            }

        }
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

package Login;

public class Power {

     static int flag;

    public static int getFlag() {
        return flag;
    }

    public static void setFlag(int flag) {
        Power.flag = flag;
    }
    static String xingming;

    public static String getXingming() {
        return xingming;
    }

    public static void setXingming(String xingming) {
        Power.xingming = xingming;
    }
    static String username;

    public static String getUsername() {
        return username;
    }

    public static void setUsername(String username) {
        Power.username = username;
    }

}

package Login;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Select {
    public boolean  select(String table,String username,String password,int num)
    {
        boolean f=false;
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try
        {
            state=conn.createStatement();
            String sql="select * from "+table;
            ResultSet rs=state.executeQuery(sql);
            while(rs.next())
            {
                if(username.equals(rs.getString(1))&&password.equals(rs.getString(2))&&rs.getInt(4)==num)
                {
                    Power.setXingming(rs.getString(3));
                    Power.setUsername(rs.getString(1));
                    System.out.println(Power.getXingming());
                    f=true;
                }
            }
            rs.close();
            state.close();
            conn.close();

        }
        catch(Exception e)
        {

        }
        return f;
    }

}

Student包中的代码：

package Student;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import Login.DBUtil;

public class Add {
    public boolean add(String table,Jieguo en)
    {
        boolean c=false;
        String sql="insert into "+table+"(kechengbianhao,gonghao,jiaoshixingming,xuehao,xingming) values('"+en.getKechengbianhao()+"','"+en.getGonghao()+"','"+en.getJiaoshixingming()+"','"+en.getXuehao()+"','"+en.getXingming()+"');";
        System.out.println(sql);
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try {
            state=conn.createStatement();
            int num=state.executeUpdate(sql);
            if(num!=0)
                c=true;

            state.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
        }

        return c;

    }

}

package Student;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import Login.DBUtil;

public class Change {
    public boolean change(String table,String lie,String lie0,String gai,String biao)
    {
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try {
            state=conn.createStatement();
            String sql="update "+table+" set "+lie+"='"+gai+"' where "+lie0+"='"+biao+"'";
            System.out.println(sql);
            state.executeUpdate(sql);
            state.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return true;
    }

}

package Student;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

import Login.DBUtil;

public class Find {
    public boolean  find(String table,String id)
    {
        boolean c;
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try
        {
            state=conn.createStatement();
            String sql="select * from "+table+" where xingming ='"+id+"'";
            ResultSet rs=state.executeQuery(sql);
            while(rs.next())
            {
                Service.setXuehao(rs.getString(1));
                Service.setXingming(rs.getString(2));
                Service.setXingbie(rs.getString(3));
                Service.setBanji(rs.getString(4));
                Service.setZhuanye(rs.getString(5));
            }
            rs.close();
            state.close();
            conn.close();
            System.out.println("over");

        }
        catch(Exception e)
        {

        }
        return true;
    }
    public void  findclass(String table,String id)
    {
        boolean c;
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try
        {
            state=conn.createStatement();
            String sql="select * from "+table+" where kechengbianhao ='"+id+"'";
            ResultSet rs=state.executeQuery(sql);
            while(rs.next())
            {
                KechengService.setKechengbianhao(rs.getString(1));
                KechengService.setKechengmingcheng(rs.getString(2));
                KechengService.setRenkejiaoshi(rs.getString(4));
                KechengService.setRenshushangxian(rs.getInt(5));
                KechengService.setXianyourenshu(rs.getInt(6));
            }
            rs.close();
            state.close();
            conn.close();
            System.out.println("over");

        }
        catch(Exception e)
        {

        }
    }
    public void  findjiaoshi(String table,String id)
    {
        boolean c;
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try
        {
            state=conn.createStatement();
            String sql="select * from "+table+" where gonghao ='"+id+"'";
            ResultSet rs=state.executeQuery(sql);
            while(rs.next())
            {
                TeacherService.setGonghao(rs.getString(1));
                TeacherService.setXingming(rs.getString(2));
                TeacherService.setXingbie(rs.getString(3));
                TeacherService.setXueyuan(rs.getString(4));
                TeacherService.setZhicheng(rs.getString(5));
            }
            rs.close();
            state.close();
            conn.close();
            System.out.println("over");

        }
        catch(Exception e)
        {

        }
    }
}

package Student;

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

import Login.DBUtil;
import Teacher.KechengService;

public class Get {
    public static List<KechengService> getAll()
    {
        List<KechengService> list=new ArrayList<KechengService>();
        Connection conn=DBUtil.getConn();
        PreparedStatement state=null;
        ResultSet rs=null;
        String sql="select * from class";
        try
        {
            state=conn.prepareStatement(sql);
            rs=state.executeQuery();
            while(rs.next())
            {
                if(rs.getInt(5)>rs.getInt(6))
                {
                    KechengService user=new KechengService();
                    user.setKechengbianhao(rs.getString(1));
                    user.setKechengmingcheng(rs.getString(2));
                    user.setGonghao(rs.getString(3));
                    user.setRenkejiaoshi(rs.getString(4));
                    user.setXianyourenshu(rs.getInt(6));
                    list.add(user);
                }
            }
            rs.close();
            state.close();
            conn.close();
        }
        catch(Exception e)
        {

        }

        if(list!=null) {

            return list;
        }else {

            return null;
        }
    }
    public static List<KechengService> getAll0()
    {
        List<KechengService> list=new ArrayList<KechengService>();
        Connection conn=DBUtil.getConn();
        PreparedStatement state=null;
        ResultSet rs=null;
        String sql="select * from class";
        try
        {
            state=conn.prepareStatement(sql);
            rs=state.executeQuery();
            while(rs.next())
            {
                    KechengService user=new KechengService();
                    user.setKechengbianhao(rs.getString(1));
                    user.setKechengmingcheng(rs.getString(2));
                    user.setGonghao(rs.getString(3));
                    user.setRenkejiaoshi(rs.getString(4));
                    user.setXianyourenshu(rs.getInt(6));
                    list.add(user);
            }
            rs.close();
            state.close();
            conn.close();
        }
        catch(Exception e)
        {

        }

        if(list!=null) {

            return list;
        }else {

            return null;
        }
    }

}

package Student;

public class Jieguo {
    String kechengbianhao;
    String jiaoshixingming;
    String gonghao;

    String xuehao;
    String xingming;
    public String getGonghao() {
        return gonghao;
    }
    public void setGonghao(String gonghao) {
        this.gonghao = gonghao;
    }
    public String getKechengbianhao() {
        return kechengbianhao;
    }
    public void setKechengbianhao(String kechengbianhao) {
        this.kechengbianhao = kechengbianhao;
    }

    public String getJiaoshixingming() {
        return jiaoshixingming;
    }
    public void setJiaoshixingming(String jiaoshixingming) {
        this.jiaoshixingming = jiaoshixingming;
    }
    public String getXuehao() {
        return xuehao;
    }
    public void setXuehao(String xuehao) {
        this.xuehao = xuehao;
    }
    public String getXingming() {
        return xingming;
    }
    public void setXingming(String xingming) {
        this.xingming = xingming;
    }

}

package Student;

public class KechengService {
    static String kechengbianhao;
    static String kechengmingcheng;
    static String renkejiaoshi;
    static int xianyourenshu;
    static int renshushangxian;
    public static int getRenshushangxian() {
        return renshushangxian;
    }
    public static void setRenshushangxian(int renshushangxian) {
        KechengService.renshushangxian = renshushangxian;
    }
    public static String getKechengbianhao() {
        return kechengbianhao;
    }
    public static void setKechengbianhao(String kechengbianhao) {
        KechengService.kechengbianhao = kechengbianhao;
    }
    public static String getKechengmingcheng() {
        return kechengmingcheng;
    }
    public static void setKechengmingcheng(String kechengmingcheng) {
        KechengService.kechengmingcheng = kechengmingcheng;
    }
    public static String getRenkejiaoshi() {
        return renkejiaoshi;
    }
    public static void setRenkejiaoshi(String renkejiaoshi) {
        KechengService.renkejiaoshi = renkejiaoshi;
    }
    public static int getXianyourenshu() {
        return xianyourenshu;
    }
    public static void setXianyourenshu(int xianyourenshu) {
        KechengService.xianyourenshu = xianyourenshu;
    }
}

package Student;

import java.io.IOException;
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 Login.Power;
import Teacher.KechengService;

/**
 * Servlet implementation class LLKEServlet
 */
@WebServlet("/LLKCServlet")
public class LLKCServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LLKCServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("submit"))
        {
            List<KechengService> userall = Get.getAll0();
            java.util.Collections.reverse(userall);
            arg0.setAttribute("all", userall);
            arg0.getRequestDispatcher("student/liulan.jsp").forward(arg0, arg1);
        }
        if(function.equals("kecheng"))
        {
            String kechengbianhao=arg0.getParameter("kechengbianhao");
            Find f=new Find();
            f.findclass("class", kechengbianhao);
            arg0.getRequestDispatcher("student/kecheng.jsp").forward(arg0, arg1);

        }
        if(function.equals("jiaoshi"))
        {
            String gonghao;
            gonghao=arg0.getParameter("gonghao");
            Find f=new Find();
            f.findjiaoshi("teacher", gonghao);
            arg0.getRequestDispatcher("student/jiaoshi.jsp").forward(arg0, arg1);
        }
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

package Student;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import Login.DBUtil;
public class Select {
    public boolean  select(String table,String kechengbianhao,String xuehao)
    {
        boolean c=true;
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try
        {
            state=conn.createStatement();
            String sql="select * from "+table;
            ResultSet rs=state.executeQuery(sql);
            while(rs.next())
            {
                if(kechengbianhao.equals(rs.getString(1))&&xuehao.equals(rs.getString(4)))
                {
                    c=false;
                }
            }
            rs.close();
            state.close();
            conn.close();

        }
        catch(Exception e)
        {

        }
        return c;
    }
}

package Student;

public class Service {
    static String xuehao;
    static String xingming;
    static String xingbie;
    static String banji;
    static String zhuanye;
    public static String getXuehao() {
        return xuehao;
    }
    public static void setXuehao(String xuehao) {
        Service.xuehao = xuehao;
    }
    public static String getXingming() {
        return xingming;
    }
    public static void setXingming(String xingming) {
        Service.xingming = xingming;
    }
    public static String getXingbie() {
        return xingbie;
    }
    public static void setXingbie(String xingbie) {
        Service.xingbie = xingbie;
    }
    public static String getBanji() {
        return banji;
    }
    public static void setBanji(String banji) {
        Service.banji = banji;
    }
    public static String getZhuanye() {
        return zhuanye;
    }
    public static void setZhuanye(String zhuanye) {
        Service.zhuanye = zhuanye;
    }
}

package Student;

import java.io.IOException;
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 Login.Power;

/**
 * Servlet implementation class SXiugaiServlet
 */
@WebServlet("/SXiugaiServlet")
public class SXiugaiServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public SXiugaiServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("submit"))
        {
            Find f=new Find();
            f.find("student", Power.getXingming());
            arg0.getRequestDispatcher("student/xiugaixinxi.jsp").forward(arg0, arg1);
        }
        if(function.equals("xiugai"))
        {
            Change c=new Change();
            String xingming;
            xingming=arg0.getParameter("xingming");
            String xingbie;
            xingbie=arg0.getParameter("xingbie");
            String banji;
            banji=arg0.getParameter("banji");
            String zhuanye;
            zhuanye=arg0.getParameter("zhuanye");
            c.change("jieguo", "xingming", "xuehao", xingming, Service.getXuehao());
            c.change("login", "name", "username", xingming, Power.getUsername());
            Power.setUsername(xingming);
            c.change("student", "xingming", "xuehao", xingming, Service.getXuehao());
            c.change("student", "xingbie", "xuehao", xingbie, Service.getXuehao());
            c.change("student", "xueyuan", "xuehao", banji, Service.getXuehao());
            c.change("student", "zhicheng", "xuehao", zhuanye, Service.getXuehao());
            arg0.setAttribute("message", "修改成功");
            arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);
        }
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

package Student;

public class TeacherService {
    static String gonghao;
    static String xingming;
    static String xingbie;
    static String xueyuan;
    static String zhicheng;
    public static String getGonghao() {
        return gonghao;
    }
    public static void setGonghao(String gonghao) {
        TeacherService.gonghao = gonghao;
    }
    public static String getXingming() {
        return xingming;
    }
    public static void setXingming(String xingming) {
        TeacherService.xingming = xingming;
    }
    public static String getXingbie() {
        return xingbie;
    }
    public static void setXingbie(String xingbie) {
        TeacherService.xingbie = xingbie;
    }
    public static String getXueyuan() {
        return xueyuan;
    }
    public static void setXueyuan(String xueyuan) {
        TeacherService.xueyuan = xueyuan;
    }
    public static String getZhicheng() {
        return zhicheng;
    }
    public static void setZhicheng(String zhicheng) {
        TeacherService.zhicheng = zhicheng;
    }

}

package Student;

import java.io.IOException;
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 Login.Power;
import Teacher.KechengService;

/**
 * Servlet implementation class XuankeServlet
 */
@WebServlet("/XuankeServlet")
public class XuankeServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public XuankeServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("submit"))
        {
            List<KechengService> userall = Get.getAll();
            java.util.Collections.reverse(userall);
            arg0.setAttribute("all", userall);
            arg0.getRequestDispatcher("student/xuanke.jsp").forward(arg0, arg1);
        }
        if(function.equals("xuanke"))
        {
            Change c=new Change();
            Jieguo j=new Jieguo();
            Find f=new Find();
            f.find("student", Power.getXingming());
            String jiaoshixingming;
            jiaoshixingming=arg0.getParameter("jiaoshixingming");
            j.setJiaoshixingming(jiaoshixingming);
            String kechengbianhao;
            kechengbianhao=arg0.getParameter("kechengbianhao");
            j.setKechengbianhao(kechengbianhao);
            String xianyourenshu;
            xianyourenshu=arg0.getParameter("xianyourenshu");
            String gonghao;
            gonghao=arg0.getParameter("gonghao");
            j.setGonghao(gonghao);
            j.setXingming(Service.getXingming());
            j.setXuehao(Service.getXuehao());
            int num=Integer.parseInt(xianyourenshu);
            num++;
            System.out.println(num);
            Select s=new Select();
            flag=s.select("jieguo",kechengbianhao,Service.getXuehao());
            if(flag)
            {
                c.change("class", "xianyourenshu", "kechengbianhao", num+"", kechengbianhao);
                Add a=new Add();
                a.add("jieguo", j);
                arg0.setAttribute("message", "选课成功");
                arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);
            }
            else
            {
                arg0.setAttribute("message", "选课重复");
                arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);
            }
        }
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

Teacher包中的文件：

package Teacher;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import Login.DBUtil;

public class Add {
    public boolean add(String table,KechengService en)
    {
        boolean c=false;
        String sql="insert into "+table+"(kechengbianhao,kechengmingcheng,gonghao,renkejiaoshi,renshushangxian,xianyourenshu) values('"+en.getKechengbianhao()+"','"+en.getKechengmingcheng()+"','"+en.getGonghao()+"','"+en.getRenkejiaoshi()+"','"+en.getRenshushangxian()+"','"+en.getXianyourenshu()+"');";
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try {
            state=conn.createStatement();
            int num=state.executeUpdate(sql);
            if(num!=0)
                c=true;

            state.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
        }

        return c;

    }

}

package Teacher;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import Login.DBUtil;

public class Change {
    public boolean change(String table,String lie,String lie0,String gai,String biao)
    {
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try {
            state=conn.createStatement();
            String sql="update "+table+" set "+lie+"='"+gai+"' where "+lie0+"='"+biao+"'";
            System.out.println(sql);
            state.executeUpdate(sql);
            state.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return true;
    }
}

package Teacher;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

import Login.DBUtil;

public class Find {
    public boolean  find(String table,String id)
    {
        boolean c;
        Connection conn=DBUtil.getConn();
        Statement state=null;
        try
        {

            state=conn.createStatement();
            String sql="select * from "+table+" where xingming ='"+id+"'";
            ResultSet rs=state.executeQuery(sql);
            while(rs.next())
            {
                Service.setGonghao(rs.getString(1));
                Service.setXingming(rs.getString(2));
                Service.setXingbie(rs.getString(3));
                Service.setXueyuan(rs.getString(4));
                Service.setZhicheng(rs.getString(5));
            }
            rs.close();
            state.close();
            conn.close();
            System.out.println("over");

        }
        catch(Exception e)
        {

        }
        return true;
    }
}

package Teacher;

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

import Login.DBUtil;

public class Get {
    public static List<KechengService> getAll(String id)
    {
        List<KechengService> list=new ArrayList<KechengService>();
        Connection conn=DBUtil.getConn();
        PreparedStatement state=null;
        ResultSet rs=null;
        String sql="select * from class where gonghao ='"+id+"'";
        try
        {
            state=conn.prepareStatement(sql);
            rs=state.executeQuery();
            while(rs.next())
            {

                    KechengService user=new KechengService();
                    user.setKechengbianhao(rs.getString(1));
                    user.setKechengmingcheng(rs.getString(2));
                    user.setGonghao(rs.getString(3));
                    user.setRenkejiaoshi(rs.getString(4));
                    user.setXianyourenshu(rs.getInt(6));
                    list.add(user);
            }
            rs.close();
            state.close();
            conn.close();
        }
        catch(Exception e)
        {

        }

        if(list!=null) {

            return list;
        }else {

            return null;
        }
    }
    public static List<Xuesheng> getAllxs(String bianhao)
    {
        List<Xuesheng> list=new ArrayList<Xuesheng>();
        Connection conn=DBUtil.getConn();
        PreparedStatement state=null;
        ResultSet rs=null;
        String sql="select * from jieguo";
        try
        {
            state=conn.prepareStatement(sql);
            rs=state.executeQuery();
            while(rs.next())
            {
                if(rs.getString(1).equals(bianhao))
                {
                    Xuesheng user=new Xuesheng();
                    user.setXingming(rs.getString(4));
                    user.setXuehao(rs.getString(3));
                    list.add(user);
                }
            }
            rs.close();
            state.close();
            conn.close();
        }
        catch(Exception e)
        {

        }

        if(list!=null) {

            return list;
        }else {

            return null;
        }
    }

}

package Teacher;

public class KechengService {
    String kechengbianhao;
    String kechengmingcheng;
    String renkejiaoshi;
    int renshushangxian;
    int xianyourenshu;
    String gonghao;
    public String getGonghao() {
        return gonghao;
    }
    public void setGonghao(String gonghao) {
        this.gonghao = gonghao;
    }
    public String getKechengbianhao() {
        return kechengbianhao;
    }
    public void setKechengbianhao(String kechengbianhao) {
        this.kechengbianhao = kechengbianhao;
    }
    public String getKechengmingcheng() {
        return kechengmingcheng;
    }
    public void setKechengmingcheng(String kechengmingcheng) {
        this.kechengmingcheng = kechengmingcheng;
    }
    public String getRenkejiaoshi() {
        return renkejiaoshi;
    }
    public void setRenkejiaoshi(String renkejiaoshi) {
        this.renkejiaoshi = renkejiaoshi;
    }
    public int getRenshushangxian() {
        return renshushangxian;
    }
    public void setRenshushangxian(int renshushangxian) {
        this.renshushangxian = renshushangxian;
    }
    public int getXianyourenshu() {
        return xianyourenshu;
    }
    public void setXianyourenshu(int xianyourenshu) {
        this.xianyourenshu = xianyourenshu;
    }

}

package Teacher;

import java.io.IOException;
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 Login.Power;
import Login.Select;

/**
 * Servlet implementation class KechengServlet
 */
@WebServlet("/KechengServlet")
public class KechengServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public KechengServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        Select s=new Select();
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("submit"))
        {
            Find f=new Find();
            f.find("teacher", Power.getXingming());
            Add a=new Add();
            KechengService ks=new KechengService();
            String kechengbianhao;
            kechengbianhao=arg0.getParameter("kechengbianhao");
            ks.setKechengbianhao(kechengbianhao);
            String kechengmingcheng;
            kechengmingcheng=arg0.getParameter("kechengmingcheng");
            ks.setKechengmingcheng(kechengmingcheng);
            String renkejiaoshi;
            renkejiaoshi=Power.getXingming();
            String gonghao;
            gonghao=Service.getGonghao();
            ks.setGonghao(gonghao);
            ks.setRenkejiaoshi(renkejiaoshi);
            String renshushangxian;
            renshushangxian=arg0.getParameter("renshushangxian");
            int num=Integer.parseInt(renshushangxian);
            ks.setRenshushangxian(num);
            ks.setXianyourenshu(0);
            a.add("class", ks);
            arg0.setAttribute("message", "添加成功");
            arg0.getRequestDispatcher("teacher/tianjiakecheng.jsp").forward(arg0, arg1);

        }
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

package Teacher;

import java.io.IOException;
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 Login.Power;
import Login.Select;

/**
 * Servlet implementation class LiulanServlet
 */
@WebServlet("/LiulanServlet")
public class LiulanServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LiulanServlet() {
        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
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        Select s=new Select();
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("liulan"))
        {
            List<KechengService> userall = Get.getAll(Service.getGonghao());
            java.util.Collections.reverse(userall);
            arg0.setAttribute("all", userall);
            arg0.getRequestDispatcher("teacher/liulanxuanke.jsp").forward(arg0, arg1);
        }
        if(function.equals("xiangxi"))
        {
            String kechengbianhao;
            kechengbianhao=arg0.getParameter("kechengbianhao");
            List<Xuesheng> userall = Get.getAllxs(kechengbianhao);
            java.util.Collections.reverse(userall);
            arg0.setAttribute("all", userall);
            arg0.getRequestDispatcher("teacher/xiangxi.jsp").forward(arg0, arg1);
        }
    }

    /**
     * @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);
    }

}

package Teacher;

public class Service {
    static String  gonghao;
    static String xingming;
    static String xingbie;
    static String xueyuan;
    public static String getGonghao() {
        return gonghao;
    }
    public static void setGonghao(String gonghao) {
        Service.gonghao = gonghao;
    }
    public static String getXingming() {
        return xingming;
    }
    public static void setXingming(String xingming) {
        Service.xingming = xingming;
    }
    public static String getXingbie() {
        return xingbie;
    }
    public static void setXingbie(String xingbie) {
        Service.xingbie = xingbie;
    }
    public static String getXueyuan() {
        return xueyuan;
    }
    public static void setXueyuan(String xueyuan) {
        Service.xueyuan = xueyuan;
    }
    public static String getZhicheng() {
        return zhicheng;
    }
    public static void setZhicheng(String zhicheng) {
        Service.zhicheng = zhicheng;
    }
    static String zhicheng;

}

package Teacher;

import java.io.IOException;
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 Login.Power;

/**
 * Servlet implementation class TXiugaiServlet
 */
@WebServlet("/TXiugaiServlet")
public class TXiugaiServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public TXiugaiServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
    {
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        boolean flag;
        String function=arg0.getParameter("method");
        if(function.equals("submit"))
        {
            Find f=new Find();
            f.find("teacher", Power.getXingming());
            arg0.getRequestDispatcher("teacher/xiugaixinxi.jsp").forward(arg0, arg1);
        }
        if(function.equals("xiugai"))
        {
            Change c=new Change();
            String xingming;
            xingming=arg0.getParameter("xingming");
            String xingbie;
            xingbie=arg0.getParameter("xingbie");
            String xueyuan;
            xueyuan=arg0.getParameter("xueyuan");
            String zhicheng;
            zhicheng=arg0.getParameter("zhicheng");
            c.change("class", "renkejiaoshi", "gonghao", xingming, Service.getGonghao());
            c.change("login", "name", "username", xingming, Power.getUsername());
            Power.setUsername(xingming);
            c.change("teacher", "xingming", "gonghao", xingming, Service.getGonghao());
            c.change("teacher", "xingbie", "gonghao", xingbie, Service.getGonghao());
            c.change("teacher", "xueyuan", "gonghao", xueyuan, Service.getGonghao());
            c.change("teacher", "zhicheng", "gonghao", zhicheng, Service.getGonghao());
            arg0.setAttribute("message", "修改成功");
            arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);
        }
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

package Teacher;

public class Xuesheng {
    String xingming;
    String xuehao;
    public String getXingming() {
        return xingming;
    }
    public void setXingming(String xingming) {
        this.xingming = xingming;
    }
    public String getXuehao() {
        return xuehao;
    }
    public void setXuehao(String xuehao) {
        this.xuehao = xuehao;
    }
}

JSP文件中：

guanli文件夹：

<%@ 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>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<body align="center">
<form action="${pageContext.request.contextPath}/RegisterServlet?method=teacher"method="post">
<table algin="center">
<tr>
<td>账号</td>
<td><input type="text"name="username"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password"name="password"></td>
</tr>
<tr>
<td>工号：</td>
<td><input type="text"name="gonghao"></td>
</tr>
<tr>
<td>姓名：</td>
<td><input type="text"name="xingming"></td>
</tr>
<tr>
<td>性别：</td>
<td><input type="text"name="xingbie"></td>
</tr>
<tr>
<td>所在学院：</td>
<td><input type="text"name="xueyuan"></td>
</tr>
<tr>
<td>职称：</td>
<td><input type="text"name="zhicheng"></td>
</tr>
</table>
<p><input type="submit"value="确定添加"style="width:100px;height:30px;background-color:#bdd7f2;"></p>
</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>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<body align="center">
<form action="${pageContext.request.contextPath}/RegisterServlet?method=student"method="post">
<table algin="center">
<tr>
<td>账号</td>
<td><input type="text"name="username"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password"name="password"></td>
</tr>
<tr>
<td>学号：</td>
<td><input type="text"name="xuehao"></td>
</tr>
<tr>
<td>姓名：</td>
<td><input type="text"name="xingming"></td>
</tr>
<tr>
<td>性别：</td>
<td><input type="text"name="xingbie"></td>
</tr>
<tr>
<td>班级：</td>
<td><input type="text"name="banji"></td>
</tr>
<tr>
<td>专业：</td>
<td><input type="text"name="zhuanye"></td>
</tr>
</table>
<p><input type="submit"value="确定添加"style="width:100px;height:30px;background-color:#bdd7f2;"></p>
</form>
</body>
</html>

student文件夹中：

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<%@ page language="java" import="Student.TeacherService"%>
<title>Insert title here</title>
</head>
<body style="margin-top:100px">
<table align="center">
<tr>
<td>工号：</td>
<td><%=TeacherService.getGonghao() %></td>
</tr>
<tr>
<td>任课教师</td>
<td><%=TeacherService.getXingming() %></td>
</tr>
<tr>
<td>教师性别</td>
<td><%=TeacherService.getXingbie() %></td>
</tr>
<tr>
<td>学院：</td>
<td><%=TeacherService.getXueyuan() %></td>
</tr>
<tr>
<td>职称</td>
<td><%=TeacherService.getZhicheng() %></td>
</tr>
</table>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<%@ page language="java" import="Student.KechengService"%>
<title>Insert title here</title>
</head>
<body style="margin-top:100px;">
<table align="center">
<tr>
<td>课程编号：</td>
<td><%=KechengService.getKechengbianhao()%></td>
</tr>
<tr>
<td>课程名称：</td>
<td><%=KechengService.getKechengmingcheng() %></td>
</tr>
<tr>
<td>任课教师：</td>
<td><%=KechengService.getRenkejiaoshi() %></td>
</tr>
<tr>
<td>课程容量：</td>
<td><%=KechengService.getRenshushangxian() %></td>
</tr>
<tr>
<td>现有人数：</td>
<td><%=KechengService.getXianyourenshu() %></td>
</tr>
</table>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
    <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<table align="center" border="1">
<tr>
<td>课程名称</td>
<td>课程编号</td>
<td>任课教师</td>

</tr>

<c:forEach  var="stu" items="${all}" >
           <tr>
           <td><a href="LLKCServlet?method=kecheng&kechengbianhao=${stu.getKechengmingcheng() }">${stu.getKechengmingcheng() }</a></td>
           <td>${stu.getKechengbianhao() }</td>
           <td><a href="LLKCServlet?method=jiaoshi&gonghao=${stu.getGonghao() }">${stu.getRenkejiaoshi() }</a></td>
           </tr>
</c:forEach>

</table>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<%@ page language="java" import="Student.Service"%>
<title>Insert title here</title>
</head>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<body>
<form action="${pageContext.request.contextPath}/SXiugaiServlet?method=xiugai"method="post">
<table>
<tr>
<td>学号</td>
<td><%=Service.getXuehao() %></td>
</tr>
<tr>
<td>姓名</td>
<td><input type="text"name="xingming"value=<%=Service.getXingming() %>></td>
</tr>
<tr>
<td>性别</td>
<td><input type="text"name="xingbie"value=<%=Service.getXingbie() %>></td>
</tr>
<tr>
<td>班级</td>
<td><input type="text"name="banji"value=<%=Service.getBanji() %>></td>
</tr>
<tr>
<td>专业</td>
<td><input type="text"name="zhuanye"value=<%=Service.getZhuanye() %>></td>
</tr>
</table>
<p><input type="submit"value="确定添加"style="width:100px;height:30px;background-color:#bdd7f2;"></p>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
    <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<table align="center" border="1">
<tr>
<td>课程名称</td>
<td>课程编号</td>
<td>任课教师</td>
<td>操作</td>
</tr>

<c:forEach  var="stu" items="${all}" >
           <tr>
           <td>${stu.getKechengmingcheng() }</td>
           <td>${stu.getKechengbianhao() }</td>
           <td>${stu.getRenkejiaoshi() }</td>
           <td><a href="${pageContext.request.contextPath}/XuankeServlet?method=xuanke&kechengbianhao=${stu.getKechengbianhao()}&xianyourenshu=${stu.getXianyourenshu()}&jiaoshixingming=${stu.getRenkejiaoshi()}&gonghao=${stu.getGonghao()}">选课</a></td>
           </tr>
</c:forEach>

</table>
</body>
</html>

teacher文件中的：

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
    <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<table align="center" border="1">
<tr>
<td>课程名称</td>
<td>课程编号</td>
<td>现有人数</td>
</tr>

<c:forEach  var="stu" items="${all}" >
           <tr>
           <td><a href="${pageContext.request.contextPath}/LiulanServlet?method=xiangxi&kechengbianhao=${stu.getKechengbianhao()}&xianyourenshu=${stu.getXianyourenshu()}">${stu.getKechengmingcheng()}</a></td>
           <td>${stu.getKechengbianhao() }</td>
           <td>${stu.getXianyourenshu() }</td>
           </tr>
</c:forEach>

</table>
</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>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<body>
<form action="${pageContext.request.contextPath}/KechengServlet?method=submit"method="post">
<table align="center">
<tr>
<td>课程编号</td>
<td><input type="text"name="kechengbianhao"></td>
</tr>
<tr>
<td>课程名称</td>
<td><input type="text"name="kechengmingcheng"></td>
</tr>
<tr>
<td>课程人数</td>
<td><input type="text"name="renshushangxian"></td>
</tr>
</table>
<p><input type="submit"value="确定添加"style="width:100px;height:30px;background-color:#bdd7f2;"></p>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
     <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<table align="center" border="1">
<tr>
<td>姓名</td>
<td>学号</td>
</tr>

<c:forEach  var="stu" items="${all}" >
           <tr>
           <td>${stu.getXingming() }</td>
           <td>${stu.getXuehao() }</td>
           </tr>
</c:forEach>

</table>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<%@ page language="java" import="Teacher.Service"%>
<title>Insert title here</title>
</head>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<body>
<form action="${pageContext.request.contextPath}/TXiugaiServlet?method=xiugai"method="post">
<table>
<tr>
<td>工号</td>
<td><%=Service.getGonghao() %></td>
</tr>
<tr>
<td>姓名</td>
<td><input type="text"name="xingming"value=<%=Service.getXingming() %>></td>
</tr>
<tr>
<td>性别</td>
<td><input type="text"name="xingbie"value=<%=Service.getXingbie() %>></td>
</tr>
<tr>
<td>所在学院</td>
<td><input type="text"name="xueyuan"value=<%=Service.getXueyuan() %>></td>
</tr>
<tr>
<td>职称</td>
<td><input type="text"name="zhicheng"value=<%=Service.getZhicheng() %>></td>
</tr>
</table>
<p><input type="submit"value="确定添加"style="width:100px;height:30px;background-color:#bdd7f2;"></p>
</form>
</body>
</html>

最下面的JSP文件：

<%@ 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>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<frameset rows="18%,*">
    <frame src="Top.jsp" name="top"></frame>
    <frameset cols="21%,*">
        <frame src="Left.jsp" name="left"></frame>
        <frame src="Right.jsp" name="right"></frame>
    </frameset>
</frameset>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<%@ page language="java" import="Login.Power"%>
<title>Insert title here</title>
<style type="text/css">
body {
    margin: 0;
    padding: 0;
    font-size: 12px;
    font-family: "Microsoft Yahei", Verdana, Arial, Helvetica, sans-serif
}
.leftMenu {
    min-width:220px;
    width:268px;
    margin:40px auto 0 auto;
}
.menu {
    border: #bdd7f2 1px solid;
    border-top: #0080c4 4px solid;
    border-bottom: #0080c4 4px solid;
    background: #f4f9ff repeat-y right;
    margin-left: 10px;
}
.menu .ListTitle {

    border-bottom: 1px #98c9ee solid;
    display: block;
    text-align: center;
    /*position: relative;*/
    height: 38px;
    line-height: 38px;
    cursor: pointer;
    /*+min-width:220px;*/

    +width:100%;
}
.ListTitlePanel {
    position: relative;
}
.leftbgbt {
    position: absolute;
    background: no-repeat;
    width: 11px;
    height: 52px;
    left: -11px;
    top: -4px;
}
/*.leftbgbt {
    float:left;
    background: no-repeat;
    width: 11px;
    height: 52px;
    left: 0px;
    top: 0px;
    zoom:1;
    z-index:200px;
}
*/
.leftbgbt2 {
    position: absolute;
    background: no-repeat;
    width: 11px;
    height: 48px;
    left: -11px;
    top: -1px;
}
.menuList {
    display: block;
    height: auto;
}
.menuList div {
    height: 28px;
    line-height: 24px;
    border-bottom: 1px #98c9ee dotted;
}
.menuList div a {
    display: block;
    background: #fff;
    line-height: 28px;
    height: 28px;

    color: #185697;
    text-decoration: none;
}
.menuList div a:hover {
    color: #f30;
    background: #0080c4;
    color: #fff;
}
</style>
</head>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    int message=Power.getFlag();

%>
<body style="margin-top:-30px">
<input type="hidden" name="message"value=<%=message %>>
<div class="leftMenu">
    <div class="menu">
        <div class="menuParent">
            <div class="ListTitlePanel">
                <div class="ListTitle">
                    <h1><strong>管理</strong></h1>
                    <div class="leftbgbt2"> </div>
                </div>
            </div>
            <div class="menuList" style="text-align:center">
            <%
                if(message==0)
                {
            %>
                <div> <a href="guanli/tianjiajiaoshi.jsp" target="right">添加教师</a></div>
                <div> <a href="guanli/tianjiaxuesheng.jsp" target="right">添加学生</a></div>
            <%
                }
            %>
            <%
                if(message==1)
                {
            %>
                <div> <a href="teacher/tianjiakecheng.jsp" target="right">添加课程</a></div>
                <div> <a href="${pageContext.request.contextPath}/TXiugaiServlet?method=submit" target="right">修改信息</a></div>
                <div> <a href="${pageContext.request.contextPath}/LiulanServlet?method=liulan" target="right">浏览选课</a></div>
            <%
                }
            %>
            <%
                if(message==2)
                {
            %>
                <div> <a href="${pageContext.request.contextPath}/XuankeServlet?method=submit" target="right">选课</a></div>
                <div> <a href="${pageContext.request.contextPath}/SXiugaiServlet?method=submit" target="right">修改信息</a></div>
                <div> <a href="${pageContext.request.contextPath}/LLKCServlet?method=submit" target="right">浏览课程</a></div>
            <%
                }
            %>
            </div>
        </div>
</div>

</body>
</html>

<%@ 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>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<body style="margin-top:150px">
<form action="LoginServlet?method=login"method="post">
<table align="center">
<tr>
    <td>账号：</td>
    <td><input type="text"name="username"style="width:150px;height:35px;"></td>
</tr>
<tr>
    <td>密码：</td>
    <td><input type="password"name="password"style="width:150px;height:35px;"></td>
</tr>
<tr>
    <td>身份：</td>
    <td>
        <select name="power">
             <option value="0">管理员</option>
             <option value="1">教师</option>
             <option value="2">学生</option>
         </select>
    </td>
</tr>
</table>
<p><input type="submit" value="登录"style="width:120px;height:35px;margin-left:40%;background-color:#bdd7f2"></p>
</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>
<%
    //
    //接收servlet传过来的那个message的参数
    //alert是js语句中的弹出警示框，也就是弹出message中的参数
    Object message=request.getAttribute("message");
    if(!(message==null||message.equals("")))
    {
        %>
        <script type="text/javascript">alert('<%=message%>')</script>
        <%
    }
%>
<body>

</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 style="background-color:#bdd7f2;margin-top:-15px">
<h1 align="center">流转系统</h1>
<strong><a href="Home.jsp" target="_parent" style="text-decoration:none;margin-left:80%">首 页&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="Login.jsp" target="_parent" style="text-decoration:none">退出</a></strong>
</body>
</html>

以上的代码均按顺序发出。

现在发一些运行图：

管理员：

学生：

教师：