都是以前写的一些程序,现在共享出来,看能不能给学习JAVA 的朋友一点帮助
package com.cheney.mysql;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import java.sql.*;
public class LoginFrame extends JFrame implements ActionListener{
JLabel label=new JLabel("请输入你的用户名和密码:");
JTextField tfName=new JTextField("");
JPasswordField tfPassword=new JPasswordField("");
JButton button=new JButton("登录");
public LoginFrame()
{
this.setTitle("登录验证");
button.addActionListener(this);
this.getContentPane().setLayout(new GridLayout(4,1));
this.getContentPane().add(label);
this.getContentPane().add(tfName);
this.getContentPane().add(tfPassword);
this.getContentPane().add(button);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(300,200);
this.setLocation(300,200);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
try{
Class.forName("org.git.mm.mysql.Driver");
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost/test","root","tbcn");
Statement stmt=conn.createStatement();
String sql="select * from account where username='"+tfName.getText()+"'";
sql +="and password='"+tfPassword.getText()+"'";
ResultSet rs=stmt.executeQuery(sql);
if(rs.next())
label.setText("合法用户");
else
label.setText("非法用户");
}
catch(Exception ee)
{
ee.printStackTrace();
}
}
public static void main(String[] args)
{
new LoginFrame();
}
}
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