Question

登陆界面的java代码怎么写？

Answer 1

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

class LoginFrm extends JFrame implements ActionListener
{
JLabel lbl1=new JLabel("用此蚂户名");
JLabel lbl2=new JLabel("密码");
JTextField txt=new JTextField(15);
JPasswordField pf=new JPasswordField();
JButton btn1=new JButton("确定");
JButton btn2=new JButton("取消"森数埋);

public LoginFrm()
{
this.setTitle("毕档登陆");
JPanel jp=(JPanel)this.getContentPane();
jp.setLayout(new GridLayout(3,2,10,10));
jp.add(lbl1);jp.add(txt);
jp.add(lbl2);jp.add(pf);
jp.add(btn1);jp.add(btn2);
btn1.addActionListener(this);
btn2.addActionListener(this);
}

public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==btn1)
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver")；
Connection con=DriverManager.getConnection("jdbc:odbc:MyDB","","");
Statement cmd=con.createStatement();
ResultSet rs=cmd.executeQuery("select * from loginAndpassword where login='"+txt.getText()+"' and password='"+pf.getText()+"'");
if(rs.next())
{
JOptionPane.showMessageDialog(null,"登陆成功！");
}
else
JOptionPane.showMessageDialog(null,"用户名或密码错误！");
} catch(Exception ex){}

if(ae.getSource()==btn2)
{
txt.setText("");
pf.setText("");
}
}
}

public static void main(String arg[])
{
JFrame.setDefaultLookAndFeelDecorated(true);
LoginFrm frm=new LoginFrm();
frm.setSize(400,200);
frm.setVisible(true);
}
}