import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.Date;import java.util.Scanner;public class Student public static final String DRIVER=sun.jdbc.odbc.JdbcOdbcDriver;public static final String URL=jdbc:odbc:student;public static final String USERNAME=root;/佣户名public static final String PASSWORD=root;/密码private static String name;/当 前登录管理员的名字private static int userid;/当前登录管理员的主键获得jdbc链接public Connection connection()try Class.forName(DRIVER);USERNAME,Connectioncon=DriverManager.getConnection(URL,PASSWORD);return con; catch (Exception e) e.printStackTrace();return null;/管理员登陆public boolean login() throws ExceptionScanner sc = new Scanner(System.in);System.out.print(” 输入用户名:”)；String username = sc.next();System.out.print(” 输入密码:)；String password = sc.next();/查找该用户String sql = select username,id from muser where username= + username + and password= + password + ;Connection connection = connection();Statement statement = connection.createStatement(); ResultSet rs = statement.executeQuery(sql);if (rs.next() name = rs.getString(1);userid = rs.getInt(2);return true;return false;/添加学生/添加学生public void addstudent()System.out.print(”请依次输入学号，姓名，年龄，地址(用逗号隔开):”);Scanner scanner = new Scanner(System.in);String str = scanner.next().split(，);/*begin 验证学号是否重复*/String sql = select * from student where 1=1 and stuno=+str0;try Connection connection = connection();Statement statement = connection.createStatement();ResultSet rs = statement.executeQuery(sql); if(rs.next()System.out.println(”该学号已经存在,请更换”);return; catch (SQLException ex) /*end 验证学号是否重复*/String sql1 = insert into student(stuno，stuname，stuage，stuaddress) values(?，?，?，?); Connection connection1 = connection();PreparedStatement statement1;try statement1 = connection1.prepareStatement(sql1);statement1.setString(1， str0); statement1.setString(2， str1);statement1.setString(3， str2); statement1.setString(4， str3);statement1.execute();System.out.println(” 添加学生成功!); catch (SQLException ex) / 查询学生public void checkstudent(String sno) throws SQLException System.out.println(n 学生列表:”)；String sql = select * from student where 1=1 ; if (sno!=null & !.equals(sno) sql = sql + and stuno=+sno；System.out.println 学号+%+姓名+t+年龄+%+地址”)； try Connection connection = connection()；Statement statement = connection.createStatement()；ResultSet rs = statement.executeQuery(sql)； while(rs.next()/ int theid = rs.getInt(1)； String sno1 = rs.getString(2)； String name1 = rs.getString(3)； String age1 = rs.getString(4)； String address1 = rs.getString(5)；/打印出来System.out.println(sno1+t+name1+t+age1+t+address1)； catch (SQLException ex) System.out.println(nn)；/删除学生public void deletestudent() System.out.print(”请输入要删除的学号:”)；Scanner scanner = new Scanner(System.in)；String stuno = scanner.next()；String sql = delete from student where stuno=+stuno；Connection connection = connection()；PreparedStatement statement; try statement = connection.prepareStatement(sql); statement.execute();System.out.println(” 删除学生成功!)； catch (SQLException ex) / 主函数入口public static void main(String args) throws Exception Student theLibrary = new Student()；/ 登陆boolean loginflag = true； while (loginflag) if(theLibrary.login()/ loginflag = false；else System.out.println(”用户名或者密码错误，请检查.)； /登陆成功提示System.out.println(n你好，+ name +! 欢迎来到学生管理系统)；boolean flag = true； while (flag) System.out.print(n操作说明：T添加学生，2删除学生,3查找学生,4显 示所有学生 ，-1 退出系统:)；Scanner scanner = new Scanner(System.in)；int input = 0；try input = scanner.nextInt()； catch (Exception e) System.out.println(请选择一个操作)；continue；if (input=-1) System.out.println(” 谢谢使用，再见!);flag = false；else /添加学生if (input=1) theLibrary.addstudent();/删除学生else if (input=2) theLibrary.deletestudent();/查找学生else if (input=3) System.out.print(n 请输入要查找学生学号:);Scanner sc = new Scanner(System.in); theLibrary.checkstudent(sc.next();/查找学生else if (input=4) theLibrary.checkstudent();else System.out.println(请输入有效的操作数字);