java课设--简单的学生成绩管理系统（可视化界面 连接MYsql数据库）

1.登录界面package kk;import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.GroupLayout;import javax.swing.GroupLayout.Alignment;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JTextField;import javax.ponentPlacement;import java.awt.Font;import javax.swing.JButton;import java.awt.event.ActionListener;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.awt.event.ActionEvent;import javax.swing.JPasswordField;public class login extends JFrame {JPanel contentPane;JTextField t1;String power;private JPasswordField t2;String zh,mm;/*** Launch the application.*/public static void main(String[] args) {EventQueue.invokeLater(new Runnable() {publ