登录页面index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>登录</title> </head> <body background="images9.jpg"> <form action="addInput.jsp" method="get"> <p style="text-align:center;color:white;font-family:宋体; font-size:20px"> <br> 学号: <input type="text" name="studentNo" /> <br> <br> 密码: <input type="password" name="password" /> <br> <br> <input type="submit" value="登录" /> <input type="reset" value="重置" /> <br> </p> </form> </body> </html>
添加课程页面addInput.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>课程添加页面</title> </head> <body background="images9.jpg"> <form action="add.jsp" method="get"> <p style="text-align:center;color: white; font-family: 宋体; font-size: 20px"> <br> 课程名称: <input type="text" name="className" /> <br> <br> 任课教师: <input type="text" name="teacher" /> <br> <br> 上课地点: <input type="text" name="classSpace" /> <br> <br> <input type="submit" value="保存" /> <input type="submit" value="选课" /> <input type="reset" value="重置" /> <br> </p> </form> <jsp:useBean id="util" class="a.Classe_add" scope="page" /> <% String studentNo=(String)request.getParameter("studentNo"); String password=(String)request.getParameter("password"); session.setAttribute("studentNo",studentNo); session.setAttribute("password",password); %> </body> </html>
java文件
package a; import java.sql.*; public class Classe_add { private String studentNo; private String password; private String className; private String teacher; private String classSpace; public String getstudentNo() { return studentNo; } public void setstudentNo(String studentNo) { this.studentNo = studentNo; } public String getspassword() { return password; } public void setpassword(String password) { this.password = password; } public String getClassName() { return className; } public void setClassName(String className) { this.className = className; } public String getTeacher() { return teacher; } public void setTeacher(String teacher) { this.teacher = teacher; } public String getClassSpace() { return classSpace; } public void setClassSpace(String classSpace) { this.classSpace = classSpace; } 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; } public void addClass(String studentNo, String className,String teacher,String classSpace ) { Connection connection = getConnection(); String sql="select count(*) from classdata where studentNo = ?"; PreparedStatement preparedStatement=null; ResultSet resultSet=null; try { preparedStatement=connection.prepareStatement(sql); preparedStatement.setString(1,getstudentNo()); resultSet = preparedStatement.executeQuery(); sql = "insert into classdata (studentNo,className,teacher,classSpace) values (?,?,?,?)"; preparedStatement=connection.prepareStatement(sql); preparedStatement.setString(1,studentNo); preparedStatement.setString(2,className); preparedStatement.setString(3,teacher); preparedStatement.setString(4,classSpace); preparedStatement.executeUpdate(); System.out.println("课程添加成功"); } catch (SQLException e) { e.printStackTrace(); }finally{ close(resultSet); close(preparedStatement); close(connection); } } public void addNo(String studentNo,String password) { Connection connection = getConnection(); String sql="select count(*) from studentdata where studentNo = ?"; PreparedStatement preparedStatement=null; ResultSet resultSet=null; try { preparedStatement=connection.prepareStatement(sql); preparedStatement.setString(1,getstudentNo()); resultSet = preparedStatement.executeQuery(); sql = "insert into studentdata (studentNO,password) values (?,?)"; preparedStatement=connection.prepareStatement(sql); preparedStatement.setString(1,studentNo); preparedStatement.setString(2,password); preparedStatement.executeUpdate(); System.out.println("信息添加成功"); } catch (SQLException e) { e.printStackTrace(); }finally{ close(resultSet); close(preparedStatement); close(connection); } } 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(); } } public boolean judgeInputNull(String className,String teacher,String classSpace) { boolean flag=false; if(className==null||"".equals(className)&&teacher==null||"".equals(teacher)&&classSpace==null||"".equals(classSpace)) { flag=true; } return flag; } public boolean judgeClassRepeat(String className) { boolean flag=false; Connection connection = getConnection(); String sql="select className from classtab where className = ?"; PreparedStatement preparedStatement=null; ResultSet resultSet=null; try { preparedStatement=connection.prepareStatement(sql); preparedStatement.setString(1,className); resultSet = preparedStatement.executeQuery(); while(resultSet.next()) { if(className.equals(resultSet.getString("className"))) { flag=true; } } }catch (SQLException e) { e.printStackTrace(); }finally { close(resultSet); close(preparedStatement); close(connection); } return flag; } public boolean judeInputTeacher(String teacher) { boolean flag=false; if((!teacher.equals("王建民"))&&!teacher.equals("刘立嘉")&&!teacher.equals("刘丹")&&!teacher.equals("王辉")&&!teacher.equals("杨子光")) { flag=true; } return flag; } public boolean judgeInputClassSpace(String space) { boolean flag=false; if(!space.startsWith("一教")&&!space.startsWith("二教")&&!space.startsWith("三教")&&!space.startsWith("基教")) { flag=true; } return flag; } public static void main(String[] args) { Classe_add a=new Classe_add(); } }
条件判断add.jsp
<%@page import="a.Classe_add"%> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title></title> </head> <body> <jsp:useBean id="util" class="a.Classe_add" scope="page" /> <% String className=(String)request.getParameter("className"); String teacher=(String)request.getParameter("teacher"); String classSpace=(String)request.getParameter("classSpace"); String studentNo=(String)session.getAttribute("studentNo"); String password=(String)session.getAttribute("password"); util.addNo(studentNo,password); if(util.judgeInputNull(className, teacher, classSpace)) { out.print("<script language ='javaScript'> alert('输入不能为空,请输入');window.history.back(-1); </script>"); } else if(util.judgeClassRepeat(className)) { out.print("<script language='javaScript'> alert('课程名称重复，重新输入');window.history.back(-1);</script>"); } else if(util.judeInputTeacher(teacher)) { out.print("<script language='javaScript'> alert('该老师不存在,重新输入');window.history.back(-1);</script>"); } else if(util.judgeInputClassSpace(classSpace)) { out.print("<script language='javaScript'> alert('教室不存在,重新输入');window.history.back(-1);</script>"); } else { util.addClass(studentNo,className,teacher,classSpace); out.print("<script language='javaScript'> alert('添加成功');</script>"); response.setHeader("refresh", "0;url=addInput.jsp"); } %> </body> </html>
实现登录、选课、然后将学生信息和选课信息添加到数据库。