import?java.awt.*;
import?javax.swing.*;
import?java.awt.event.*;
import?java.sql.*;
class?LoginFrm?extends?JFrame?implements?ActionListener//?throws?Exception
{
JLabel?lbl1?=?new?JLabel("用戶名:");
JLabel?lbl2?=?new?JLabel("密碼:");
JTextField?txt?=?new?JTextField(5);
JPasswordField?pf?=?new?JPasswordField();
JButton?btn1?=?new?JButton("確定");
JButton?btn2?=?new?JButton("取消");
public?LoginFrm()?{
this.setTitle("登陸");
JPanel?jp?=?(JPanel)?this.getContentPane();
jp.setLayout(new?GridLayout(3,?2,?5,?5));
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("com.mysql.jdbc.Driver");//?mysql數據庫
Connection?con?=?DriverManager.getConnection(
"jdbc:mysql://localhost/Car_zl",?"root",?"1");//?數據庫名為Car_zl，密碼為1
System.out.println("com?:?"+?con);
Statement?cmd?=?con.createStatement();
String?sql?=?"select?*?from?user?where?User_ID='"
+?txt.getText()?+?"'?and?User_ps='"
+?pf.getText()?+?"'"?;
ResultSet?rs?=?cmd
.executeQuery(sql);//?表名為user，user_ID和User_ps是存放用戶名和密碼的字段名
if?(rs.next())?{
JOptionPane.showMessageDialog(null,?"登陸成功！");
}?else
JOptionPane.showMessageDialog(null,?"用戶名或密碼錯誤！");
}?catch?(Exception?ex)?{
}
if?(ae.getSource()?==?btn2)?{
System.out.println("1111111111111");
//txt.setText("");
//pf.setText("");
System.exit(0);
}
}
}
public?static?void?main(String?arg[])?{
JFrame.setDefaultLookAndFeelDecorated(true);
LoginFrm?frm?=?new?LoginFrm();
frm.setSize(400,?200);
frm.setVisible(true);
}
}