Java课程设计源码——学生信息管理系统 SQL

2022.6.9 更新
这个课程作业的代码有小伙伴反馈有问题（数据库无法连接等），但博主最近学业不用Java了，暂时没时间看，如果有同学有解决方案，可以在下面评论帮助一下其他同学。实在抱歉啦。

package shujuku;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import java.util.*;
import java.sql.*;
import javax.swing.table.*;

class allstudent extends JFrame implements ActionListener {
	JMenu jm = new JMenu("信息");
	JMenuItem j1 = new JMenuItem("显示信息");
	JMenuItem j2 = new JMenuItem("退出");
	JMenuBar JBar = new JMenuBar();

	allstudent() {
		super("学生信息记录表");
		setSize(540, 400);
		setLocation(320, 240);
		//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		JBar.add(jm);
		jm.add(j1);
		jm.add(j2);
		setJMenuBar(JBar);
		j1.addActionListener(this);
		j2.addActionListener(this);
		setVisible(true);
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == j2)
			this.dispose();
		else if (e.getSource() == j1) {
			int i, j, row;
			try {
				Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
			} catch (ClassNotFoundException ce) {
			}
			try {
				Connection con = DriverManager
						.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");
				Statement stm = con.createStatement();
				ResultSet rs = stm.executeQuery("select * from info");
				displayResultSet(rs);
				rs.close();
				stm.close();
				//con.close();
			} catch (SQLException se) {
			}
		}
	}

	public void displayResultSet(ResultSet rs) throws SQLException {
		boolean moreRecords = rs.next();
		if (!moreRecords) {
			JOptionPane.showMessageDialog(null, "结果无记录", "无记录", JOptionPane.INFORMATION_MESSAGE);
			//return;
		}
		Vector rows = new Vector();
		Vector columnHeads = new Vector();
		try {
			ResultSetMetaData rsmd = rs.getMetaData();
			for (int i = 1; i <= rsmd.getColumnCount(); i++)
				columnHeads.addElement(rsmd.getColumnName(i));
			do {
				rows.addElement(getNextRow(rs, rsmd));
			} while (rs.next());
			JTable table = new JTable(rows, columnHeads);
			table.setSize(new Dimension(400, 400));
			JScrollPane scroller = new JScrollPane(table);
			Container c = getContentPane();
			c.add(scroller, BorderLayout.CENTER);
			c.validate();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	private Vector getNextRow(ResultSet rs, ResultSetMetaData rsmd) throws SQLException {
		Vector currentRow = new Vector();
		for (int i = 1; i <= rsmd.getColumnCount(); i++)
			currentRow.addElement(rs.getString(i));
		return currentRow;
	}

//	public static void main(String[] args) {
//		new allstudent();
//	}
}

/*
 * 功能：用来和数据库SQLserver进行连接，以及相应的查询方法。
 */
package shujuku; 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JOptionPane;
 
//写一个类，用来与数据库建立连接，并且查询数据
class GetSQL {
	// 设定用户名和密码
	static String userword;
	static String pwd;
	
	static String english;
	static String num;
	static String name;
	static String chinese;
	static String zhengzhi;
	static String math;
	
	static String age;
	static String salary;
	static String sex;
	static String zhicheng;
	static String teanum;
	static String teaname;
 
	static Connection ct = null;
	static PreparedStatement ps = null;
	static ResultSet rs = null;
 
	// 用于连接数据库的方法，可用于子类的继承
	public static void ConnectSQL() {
		try {
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
			ct = DriverManager.getConnection( "jdbc:sqlserver://localhost:1433;databaseName=StudentManager","sa","123456");
			System.out.println("The SQL is connected");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
	}
 
	// 用于向数据库进行查询的方法
	public static void querystu(String s,String username) {
		// 创建火箭车
		try { 
			ps = ct.prepareStatement("select * from info where 权限=? and 用户名=? ");
			// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式
			ps.setString(1, s);
			ps.setString(2, username);
			// ResultSet结果集,可以把ResultSet理解成返回一张表行的结果集
			rs = ps.executeQuery();
			// 循环取出
			if (rs.next()) {
				// 将教师的用户名和密码取出
				userword = rs.getString(2);
				pwd = rs.getString(3);
				System.out.println("成功获取到密码和用户名from数据库");
				//System.out.println(userword + "\t" + pwd + "\t");
			}else
			{
				JOptionPane.showMessageDialog(null, "没有此用户，请重新输入！", "提示消息", JOptionPane.WARNING_MESSAGE);
			}
		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	//在教师表中进行查询
	public static void querytea(String s,String name ) {
		// 创建火箭车
		try {
			ps = ct.prepareStatement("select * from info_tea where 权限=? and 用户名=? ");
			// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式
			ps.setString(1, s);
			ps.setString(2, name);
			// ResultSet结果集,可以把ResultSet理解成返回一张表行的结果集
			rs = ps.executeQuery();
			// 循环取出
			if (rs.next()) {
				// 将教师的用户名和密码取出
				userword = rs.getString(2);
				pwd = rs.getString(3);
				System.out.println("成功获取到密码和用户名from数据库");
				//System.out.println(userword + "\t" + pwd + "\t");
			}else
			{
				JOptionPane.showMessageDialog(null, "没有此用户，请重新输入！", "提示消息", JOptionPane.WARNING_MESSAGE);
			}
		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
 
	//从数据库中根据学号或者教工号来查询数据，并且填入表格。
	public static void getdatastu(String s) {
		// 创建火箭车
		try {
			ps = ct.prepareStatement("select * from info where 学号 =? ");
			// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式
			ps.setString(1, s);
			// ResultSet结果集,大家可以把ResultSet理解成返回一张表行的结果集
			rs = ps.executeQuery();
			if(rs.next())	
			{
				// 将学生的用户名和密码取出
				num = rs.getString(4);
				name = rs.getString(5);
				math = rs.getString(6);
				chinese = rs.getString(7);
				english = rs.getString(8);
				zhengzhi = rs.getString(9);
			}else
			{
				JOptionPane.showMessageDialog(null, "沒有此学生，请重新输入", "提示消息", JOptionPane.WARNING_MESSAGE);
			}
	
		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	public static void getdatatea(String s) {
		// 创建火箭车
		try {
			ps = ct.prepareStatement("select * from info_tea where 教师编号 =? ");
			// 给?赋值(可防止SQL注入漏洞问题)，不要直接使用拼接的方式
			ps.setString(1, s);
			// ResultSet结果集,大家可以把ResultSet理解成返回一张表行的结果集
			rs = ps.executeQuery();
			if(rs.next())	
			{
				// 将教师的用户名和密码取出
				teanum = rs.getString(4);
				teaname = rs.getString(5);
				sex = rs.getString(6);
				salary = rs.getString(7);
				zhicheng = rs.getString(8);
				age = rs.getString(9);
			}else
			{
				JOptionPane.showMessageDialog(null, "沒有此教师，请重新输入", "提示消息", JOptionPane.WARNING_MESSAGE);
			}
	
		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	
}

package shujuku;

import javax.swing.*;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;

public class Login extends JFrame implements ActionListener {

	// 定义登录界面的组件
	JButton jb1, jb2, jb3 = null;
	JRadioButton jrb1, jrb2 = null;
	JPanel jp1, jp2, jp3, jp4 = null;
	JTextField jtf = null;
	JLabel jlb1, jlb2, jlb3 = null;
	JPasswordField jpf = null;
	ButtonGroup bg = null;

	// 菜单项
	JMenuBar jmb = null;
	JMenu jm = null;
	JMenuItem jmi1, jmi2 = null;

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Login ms = new Login();

	}

	// 构造函数
	public Login() {
		// 创建组件
		jb1 = new JButton("登录");
		jb2 = new JButton("重置");
		jb3 = new JButton("退出");
		// 设置监听
		jb1.addActionListener(this);
		jb2.addActionListener(this);
		jb3.addActionListener(this);

		jmb = new JMenuBar(); // JMenuBar指菜单栏
		jm = new JMenu("选项"); // JMenu是菜单栏中的选项栏
		jmi1 = new JMenuItem("开始"); // JMenuItem指选项栏中的选项
		jmi2 = new JMenuItem("退出系统");
		jm.add(jmi1);
		jm.add(jmi2);
		jmb.add(jm);

		jrb1 = new JRadioButton("教师", true);
		jrb2 = new JRadioButton("学生");
		bg = new ButtonGroup();
		bg.add(jrb1);
		bg.add(jrb2);
//		jrb2.setSelected(true);

		jp1 = new JPanel();
		jp2 = new JPanel();
		jp3 = new JPanel();
		jp4 = new JPanel();

		jlb1 = new JLabel("用户名：");
		jlb2 = new JLabel("密    码：");
		jlb3 = new JLabel("权    限：");

		jtf = new JTextField(10);
		jpf = new JPasswordField(10);
		// 加入到JPanel中
		jp1.add(jlb1);
		jp1.add(jtf);

		jp2.add(jlb2);
		jp2.add(jpf);

		jp3.add(jlb3);
		jp3.add(jrb1);
		jp3.add(jrb2);

		jp4.add(jb1);
		jp4.add(jb2);
		jp4.add(jb3);

		// 加入JFrame中
		this.setJMenuBar(jmb);
		this.add(jp1);
		this.add(jp2);
		this.add(jp3);
		this.add(jp4);
		// 设置布局管理器
		this.setLayout(new GridLayout(4, 1));
		// 给窗口设置标题
		this.setTitle("学生成绩管理系统");
		// 设置窗体大小
		this.setSize(300, 250);
		// 设置窗体初始位置
		this.setLocation(200, 150);
		// 设置当关闭窗口时，保证JVM也退出
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		// 显示窗体
		this.setVisible(true);
		this.setResizable(true);

	}

	@Override
	public void actionPerformed(ActionEvent e) {

		if (e.getActionCommand() == "退出") {
			System.exit(0);
		} else if (e.getActionCommand() == "登录") {
			if (!jtf.getText().isEmpty() && !jpf.getText().isEmpty()) {
				// 当点击登录按钮时，首先与数据库建立连接
				GetSQL.ConnectSQL();
				// 如果选中教师登录 
				if (jrb1.isSelected()) {
					GetSQL.querytea("教师", jtf.getText());
					// 首先判断是否存在该用户，即是否得到了密码
					if (GetSQL.pwd == null) {
						this.clear();
					} else {
						// 调用登录方法
						this.tealogin();
					}
				} else if (jrb2.isSelected()) // 学生在登录系统
				{
					GetSQL.querystu("学生", jtf.getText());
					// 首先判断是否存在该用户，即是否得到了密码
					if (GetSQL.pwd == null) {
						this.clear();
					} else {
						// 调用登录方法
						this.stulogin();
					}

				}
			} else if (jtf.getText().isEmpty()) {
				JOptionPane.showMessageDialog(null, "请输入用户名", "提示消息", JOptionPane.WARNING_MESSAGE);
				this.clear();
			} else if (jpf.getText().isEmpty()) {
				JOptionPane.showMessageDialog(null, "请输入密码", "提示消息", JOptionPane.WARNING_MESSAGE);
				this.clear();
			}
		} else if (e.getActionCommand() == "重置") {
			this.clear();
		}

	}

	// 清空文本框和密码框
	public void clear() {
		jtf.setText("");
		jpf.setText("");
	}

	// 学生登录判断方法
	public void stulogin() {
		if (GetSQL.pwd.equals(jpf.getText())) {
//					System.out.println("登录成功");
			JOptionPane.showMessageDialog(null, "登录成功！", "提示消息", JOptionPane.WARNING_MESSAGE);
			this.clear();
			// 关闭当前界面
			dispose();
			// 创建一个新界面
			Stu_UI ui = new Stu_UI();
		} else if (jtf.getText().isEmpty() && jpf.getText().isEmpty()) {
			JOptionPane.showMessageDialog(null, "请输入用户名和密码！", "提示消息", JOptionPane.WARNING_MESSAGE);
		} else if (jtf.getText().isEmpty()) {
			JOptionPane.showMessageDialog(null, "请输入用户名！", "提示消息", JOptionPane.WARNING_MESSAGE);
		} else if (jpf.getText().isEmpty()) {
			JOptionPane.showMessageDialog(null, "请输入密码！", "提示消息", JOptionPane.WARNING_MESSAGE);
		} else {
			JOptionPane.showMessageDialog(null, "用户名或者密码错误！\n请重新输入", "提示消息", JOptionPane.ERROR_MESSAGE);
			// 清空输入框
			this.clear();
		}
	}

	// 教师登录判断方法
	public void tealogin() {
		if (GetSQL.pwd.equals(jpf.getText())) {
//					System.out.println("登录成功");
			JOptionPane.showMessageDialog(null, "登录成功！", "提示消息", JOptionPane.WARNING_MESSAGE);
			this.clear();
			// 关闭当前界面
			dispose();
			// 创建一个新界面，适用于教师来管理学生
			Teacher t = new Teacher();
		} else if (jtf.getText().isEmpty() && jpf.getText().isEmpty()) {
			JOptionPane.showMessageDialog(null, "请输入用户名和密码！", "提示消息", JOptionPane.WARNING_MESSAGE);
		} else if (jtf.getText().isEmpty()) {
			JOptionPane.showMessageDialog(null, "请输入用户名！", "提示消息", JOptionPane.WARNING_MESSAGE);
		} else if (jpf.getText().isEmpty()) {
			JOptionPane.showMessageDialog(null, "请输入密码！", "提示消息", JOptionPane.WARNING_MESSAGE);
		} else {
			JOptionPane.showMessageDialog(null, "用户名或者密码错误！\n请重新输入", "提示消息", JOptionPane.ERROR_MESSAGE);
			// 清空输入框
			this.clear();
		}
	}

}

 /*
 * 功能：学生登录成功界面。
 * 
 */
package shujuku;
import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.swing.*;
 
public class Stu_UI extends JFrame implements ActionListener
{
	     //定义组件
	JMenuBar jm= new JMenuBar();
	JMenu jm1 = new JMenu("查询");
	JMenuItem jmi1 = new JMenuItem("基本信息");
	JMenu jm2 = new JMenu("修改");
	JMenuItem jmi2 = new JMenuItem("修改密码");
	
//		public static void main(String[] args) {
//			// TODO Auto-generated method stub
//			Stu_UI  ui=new Stu_UI();
//		}	
	    //构造函数
		public  Stu_UI()    //不能申明为void!!!!!否则弹不出新界面
		{
			//创建组件
			this.setTitle("学生管理系统");
			this.setLayout(new CardLayout());
			this.setJMenuBar(jm);
			
			jm.add(jm1);	
			jm.add(jm2);   
			jm1.add(jmi1);  
			jm2.add(jmi2);  
	
			jmi1.addActionListener(this);
			jmi2.addActionListener(this);
			
			this.setSize(400,300);
			this.setLocation(200, 200);		
			this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			this.setVisible(true);		
}
		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub
			   if(e.getSource()==jmi1){
				   find();
			   }
			   if(e.getSource()==jmi2){
				   change();
			   }
		}
		public void find(){
			final JDialog fontDialog = new JDialog(this, "基本信息", false);
			Container con = fontDialog.getContentPane();
			JPanel panel1 = new JPanel();
			panel1.setLayout(new GridLayout(5,2));
			JPanel panel2 = new JPanel();
			JLabel J1 = new JLabel("请输入学号：");
			final JTextField JT1 = new JTextField(15);
			JLabel math = new JLabel("数学:");
			final JTextField math1 = new JTextField(15);
			JLabel chinese = new JLabel("语文:");
			final JTextField chinese1 = new JTextField(15);
			JLabel eng = new JLabel("英语:");
			final JTextField eng1 = new JTextField(15);
			JLabel zhengzhi = new JLabel("政治:");
			final JTextField zhengzhi1 = new JTextField(15);
	
			JButton JB1 = new JButton("查询");
			panel1.add(J1);
			panel1.add(JT1);
			panel1.add(math);
			panel1.add(math1);
			panel1.add(chinese);
			panel1.add(chinese1);
			panel1.add(eng);
			panel1.add(eng1);
			panel1.add(zhengzhi);
			panel1.add(zhengzhi1);
			
			panel2.add(JB1);
			
			con.add(panel1);
			con.add(panel2);
			con.setLayout(new GridLayout(2,1));
			fontDialog.setSize(400, 400);
			fontDialog.setLocation(200, 200);
			fontDialog.setResizable(true);
			fontDialog.setVisible(true);
			JB1.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					try{
						Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
					}catch (ClassNotFoundException ce){}
					try
					{
						Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager","sa","123456");
						Statement stm = con.createStatement();
						ResultSet rs = stm.executeQuery("select * from info where 学号= '" + JT1.getText()+ "'");
						if(rs.next()){
							math1.setText(rs.getString("数学"));
							chinese1.setText(rs.getString("语文"));
							eng1.setText(rs.getString("英语"));
							zhengzhi1.setText(rs.getString("政治"));
						}
						else {
							JOptionPane.showMessageDialog(null,"不存在该记录！");}
					}
					catch (SQLException se)
					{
						JOptionPane.showMessageDialog(null,se.getMessage()); }
				}
			});
		}
			public void change(){
				final JDialog fontDialog = new JDialog(this, "修改个人密码", false);
				Container con = fontDialog.getContentPane();
				JPanel panel1 = new JPanel();
				panel1.setLayout(new GridLayout(4,2));
				JPanel panel2 = new JPanel();
				JLabel JLP = new JLabel("请输入你的学号:");
				final JTextField JTL = new JTextField();
				JLabel JLP1 = new JLabel("请输入原来密 码 : ");
				JPasswordField JTP1 = new JPasswordField();
				JLabel JLP2 = new JLabel("请输入新密 码 : ");
				JPasswordField JTP2 = new JPasswordField();
				JLabel JLP3 = new JLabel("请再次输入新密 码   : ");
				final JPasswordField JTP3 = new JPasswordField();
				JButton JB1 = new JButton("确定");
				JButton JB2 = new JButton("退出");
				panel1.add(JLP);
				panel1.add(JTL);
				panel1.add(JLP1);
				panel1.add(JTP1);
				panel1.add(JLP2);
				panel1.add(JTP2);
				panel1.add(JLP3);
				panel1.add(JTP3);
				panel2.add(JB1);
				panel2.add(JB2);
				con.setLayout(new GridLayout(2,1));
				con.add(panel1);
				con.add(panel2);
				fontDialog.setSize(400, 340);
				fontDialog.setLocation(200, 200);
				fontDialog.setResizable(false);
				fontDialog.setVisible(true);
				JB1.addActionListener(new ActionListener() {
					public void actionPerformed(ActionEvent e) {
						try{	
							JTL.setEditable(false);
							Connection cot = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=StudentManager","sa","123456");
							Statement stmt = cot.createStatement();
							int a =	stmt.executeUpdate("Update info set 密码='"+JTP3.getText()+"'where 学号='"+JTL.getText()+"'");
							//System.out.print("成功了"); 
							if(a==1){JOptionPane.showMessageDialog(null,"修改成功");}
							else
							{
								JOptionPane.showMessageDialog(null,"修改失败");}
					}catch(SQLException se){System.out.print("数据连接或修改失败"); }
					}
				});	
			}
		
}

/*
 * 功能：实现了查询修改删除学生的信息。
 */
package shujuku;

import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.ActionEvent;
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.sql.Statement;

public class Teacher extends JFrame implements ActionListener {

	// 定义组件
	JMenuBar mainMenu = new JMenuBar();
	JMenu menu1 = new JMenu("学生信息操作");
	JMenuItem itemAdd = new JMenuItem("添加学生信息");
	JMenuItem itemDel = new JMenuItem("删除学生信息");
	JMenuItem itemMod = new JMenuItem("修改学生信息");
	JMenu itemSel = new JMenu("查看学生信息");
	JMenuItem item1 = new JMenuItem("查看全部学生");
	JMenuItem item2 = new JMenuItem("查看指定学生");
	JPanel jp = new JPanel();

	// 构造函数
	public Teacher() {
		// 创建组件
		super("学生管理系统-老师界面");
		mainMenu.add(menu1);
		mainMenu.add(itemSel);
		menu1.add(itemAdd);
		menu1.add(itemDel);
		menu1.add(itemMod);
		//menu1.add(itemSel);
		itemSel.add(item1);
		itemSel.add(item2);

		itemAdd.addActionListener(this);
		itemDel.addActionListener(this);
		itemMod.addActionListener(this);
		itemSel.addActionListener(this);
		item1.addActionListener(this);
		item2.addActionListener(this);

		this.setSize(320, 240);
		this.setResizable(false);
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setJMenuBar(mainMenu);
		this.add(jp);

		this.setLayout(null);
		this.setTitle("学生成绩管理系统—教师");
		this.setSize(500, 500);
		this.setLocation(150, 150);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
		this.setResizable(true);

	}

	public void Add() {
		final JDialog fontDialog = new JDialog(this, "添加学生信息", false);
		Container con = fontDialog.getContentPane();
		JPanel panel1 = new JPanel();
		panel1.setLayout(new GridLayout(4, 2));
		JPanel panel2 = new JPanel();
		JLabel JLNumber = new JLabel("学号:");
		final JTextField JTNumber = new JTextField(15);
		JLabel JLName = new JLabel("姓名:");
		final JTextField JTName = new JTextField(15);
		JLabel JLusername = new JLabel("用户名:");
		final JTextField JTuname = new JTextField(15);
		JLabel JLpassword = new JLabel("密码:");
		final JTextField JTpassword = new JTextField(15);
		
		JButton JBAdd = new JButton("添加");
		JButton JBNext = new JButton("重置");

		panel1.add(JLNumber);
		panel1.add(JTNumber);
		panel1.add(JLName);
		panel1.add(JTName);
		panel1.add(JLusername);
		panel1.add(JTuname);
		panel1.add(JLpassword);
		panel1.add(JTpassword);

		panel2.add(JBAdd);
		panel2.add(JBNext);

		con.setLayout(new GridLayout(2, 1));
		con.add(panel1);
		con.add(panel2);
		fontDialog.setSize(400, 340);
		fontDialog.setLocation(200, 200);
		fontDialog.setResizable(true);
		fontDialog.setVisible(true);
		JBAdd.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				try {
					Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
				} catch (ClassNotFoundException ce) {
					JOptionPane.showMessageDialog(null, ce.getMessage());
				}
				try {
					Connection con = DriverManager.getConnection(
							"jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");
					Statement stm = con.createStatement();
					int a = stm.executeUpdate("insert into info(权限,用户名,密码,学号,姓名) "+" values ('学生'"+",'"+JTuname.getText()+"','"+JTpassword.getText()+"','"+JTNumber.getText()+"','"+JTName.getText()+"')");
					if (a == 1) {
						JOptionPane.showMessageDialog(null, "添加成功!");
					} else {
						JOptionPane.showMessageDialog(null, "添加失败!");
					}
					stm.close();
				} catch (Exception ee) {
					JOptionPane.showMessageDialog(null, ee.getMessage());
				}
			}
		});
		JBNext.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JTNumber.setText("");
				JTName.setText("");
				JTuname.setText("");
				JTpassword.setText("");
			}
		});
	}

	public void Select() {
		final JDialog fontDialog = new JDialog(this, "学生信息", false);
		Container con = fontDialog.getContentPane();
		JPanel panel1 = new JPanel();
		panel1.setLayout(new GridLayout(6, 2));
		JPanel panel2 = new JPanel();
		JLabel J1 = new JLabel("请输入学号：");
		final JTextField JT1 = new JTextField("");
		JLabel Jname = new JLabel("姓名：");
		final JTextField JTname = new JTextField("");
		JLabel JLmath = new JLabel("数学:");
		final JTextField JTmath = new JTextField();
		JLabel JLchinese = new JLabel("语文:");
		final JTextField JTchinese = new JTextField();
		JLabel JLeng = new JLabel("英语:");
		final JTextField JTeng = new JTextField(15);
		JLabel JLzhengzhi = new JLabel("政治:");
		final JTextField JTzhengzhi = new JTextField(15);

		JButton JB1 = new JButton("查询");
		JButton JB2 = new JButton("重置");
		JButton JB3 = new JButton("删除");
		JButton JB4 = new JButton("修改");

		panel1.add(J1);
		panel1.add(JT1);
		panel1.add(Jname);
		panel1.add(JTname);
		panel1.add(JLmath);
		panel1.add(JTmath);
		panel1.add(JLchinese);
		panel1.add(JTchinese);
		panel1.add(JLeng);
		panel1.add(JTeng);
		panel1.add(JLzhengzhi);
		panel1.add(JTzhengzhi);

		panel2.add(JB1);
		panel2.add(JB2);
		panel2.add(JB3);
		panel2.add(JB4);

		con.setLayout(new GridLayout(2, 1));

		con.add(panel1);
		con.add(panel2);

		fontDialog.setSize(400, 340);
		fontDialog.setLocation(200, 200);
		fontDialog.setResizable(true);
		fontDialog.setVisible(true);

		JB1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				try {
					Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
				} catch (ClassNotFoundException ce) {
				}
				try {
					Connection con = DriverManager.getConnection(
							"jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");
					Statement stm = con.createStatement();
					ResultSet rs = stm.executeQuery("select * from info where 学号=  '" + JT1.getText() + "'");
					if (rs.next()) {
						JTname.setText(rs.getString("姓名"));
						JTmath.setText(rs.getString("数学"));
						JTchinese.setText(rs.getString("语文"));
						JTeng.setText(rs.getString("英语"));
						JTzhengzhi.setText(rs.getString("政治"));

					} else {
						JOptionPane.showMessageDialog(null, "不存在该记录！");
					}
				} catch (SQLException se) {
					JOptionPane.showMessageDialog(null, se.getMessage());
				}
			}
		});
		JB2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JT1.setText(null);
				JTmath.setText("");
				JTchinese.setText("");
				JTeng.setText("");
				JTzhengzhi.setText("");
				JT1.requestFocus();
			}
		});
		JB3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				try {
					Connection con = DriverManager.getConnection(
							"jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");
					Statement stmt = con.createStatement();
					int a = stmt.executeUpdate("delete from info where 学号='" + JT1.getText() + "' ");
					if (a == 1) {
						JOptionPane.showMessageDialog(null, "删除成功！");
					} else {
						JOptionPane.showMessageDialog(null, "删除失败！");
					}
					JTmath.setText("");
					JTchinese.setText("");
					JTeng.setText("");
					JTzhengzhi.setText("");
					con.close();
				} catch (SQLException ee) {
				}
			}
		});
		JB4.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				try {
					Connection con = DriverManager.getConnection(
							"jdbc:sqlserver://localhost:1433;databaseName=StudentManager", "sa", "123456");
					Statement stmt = con.createStatement();
					int a =	stmt.executeUpdate("Update info set 数学='"+JTmath.getText()+"'," +
					 		"语文='"+JTchinese.getText()+"',"+"英语='"+JTeng.getText()+"',"+"政治="+JTzhengzhi.getText()+"where 学号='"+JT1.getText()+"'");
					stmt = con.createStatement();
					//System.out.println("chenggong");
					if (a == 1) {
						JOptionPane.showMessageDialog(null, "修改成功");
					} else {
						JOptionPane.showMessageDialog(null, "修改失败");
					}
					JTmath.setText("");
					JTchinese.setText("");
					JTeng.setText("");
					JTzhengzhi.setText("");
					con.close();
				} catch (SQLException se) {
				}
			}
		});
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		if (e.getSource() == itemAdd) {
			Add();
		} else if (e.getSource() == item1) {
			new allstudent();
		} else {
			Select();
		}
	}

	public static void main(String[] args) {
//		 TODO Auto-generated method stub
		new Teacher();
	}
}