中国地质大学北京信息管理与信息系统——Java程序设计第四次上机part0（老天爷，终于写出来了）

package Nobody_care;

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Connection;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class Mysql_test {
   
	public static void main(String[] args) throws ClassNotFoundException, SQLException {
   

		// TODO Auto-generated method stub
		JFrame jf = new JFrame("成绩录入界面");
		jf.setLayout(new GridLayout(7, 2));
		JLabel a[] = new