该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.sql.Connection;

import java.sql.DriverManager;

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

public class LoginSystem extends JFrame{

public LoginSystem(){

JLabel label=null;

this.getContentPane().add(label=new JLabel("用户名：")).setBounds(10, 10, 100,30 );

this.getContentPane().add(label=new JLabel("密 码：")).setBounds(10, 50, 100, 30);

final JTextField jf=new JTextField();

final JPasswordField jp=new JPasswordField();

this.getContentPane().add(jf).setBounds(120, 10, 100, 30);

this.getContentPane().add(jp).setBounds(120, 50, 100, 30);

final JButton jb=new JButton("登录");

this.getContentPane().add(jb).setBounds(10, 90, 100, 30);

this.setLayout(null);

this.setBounds(100, 100, 300, 200);

jb.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

String use=jf.getText();

String pwd=jp.getText();

String driver="com.mysql.jdbc.Driver";

String url="jdbc:mysql://127.0.0.1:3306/student";

String user="root";

String password="root";

try {

Class.forName(driver);

Connection con=DriverManager.getConnection(url,user,password);

Statement state=con.createStatement();

ResultSet rs=state.executeQuery("select *from login where user='"+use+"'");

if(rs.next()){

if(rs.getString("password").equals(pwd)){

JOptionPane.showMessageDialog(jb, "登录成功！");

}

else

JOptionPane.showMessageDialog(jb, "登录失败！");

}

else

JOptionPane.showMessageDialog(jb, "登录失败！");

} catch (Exception e2) {

// TODO: handle exception

}

}

});

}

public static void main(String[] args) {

LoginSystem ls=new LoginSystem();

ls.setVisible(true);

} }

小弟也是初学~~~希望大家别笑话哦。。。。