饭卡管理系统(java)
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package mysql;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
class Login extends JFrame
{
private static final long serialVersionUID = 1L;
private static JFrame frame = new JFrame("学生饭卡管理系统登录界面");
private JButton submit = new JButton("登陆");
private JButton reset = new JButton("重置");
private JButton assign=new JButton("注册");
JLabel nameLab = new JLabel("用户名：");
private JLabel passwdLab = new JLabel("密码：");
private JLabel lab = new JLabel();
public JTextField nameText = new JTextField(20);
public JPasswordField passwdText = new JPasswordField(20);
public Login(){}
public void login(){
nameLab.setBounds(60, 20, 100,20);
passwdLab.setBounds(60, 50, 100,20);
lab.setBounds(100, 90, 200,20);
nameText.setBounds(120, 20, 100, 20);
passwdText.setBounds(120, 50, 100, 20);
submit.setBounds(120, 120, 100, 30);
reset.setBounds(250, 50, 60, 20);
assign.setBounds(250,20,60,20);
//passwdText.setEchoChar('*');
frame.add(nameLab);
frame.add(passwdLab);
frame.add(lab);
frame.add(nameText); //用户名
frame.add(passwdText); //用户密码
frame.add(submit);
frame.add(reset);
frame.add(assign);
frame.setSize(400, 220);
frame.setLocation(400, 250);
ImagePanel img = new ImagePanel();
img.setBounds(0,0,400,200);
frame.add(img);
frame.setVisible(true);
submit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
@SuppressWarnings("deprecation")
String passwd=passwdText.getText().toString();
String name=nameText.getText();
try{
ResultSet sqlRst=null;
Class.forName("com.mysql.jdbc.Driver");
Connection
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/test1","root","123456");
Statement st= conn.createStatement();
String sql = "select * from user where name='"+name+"' and passwd='"+passwd+"';";
sqlRst=st.executeQuery(sql);
if(sqlRst.next()){
frame.dispose();
new Fankajiemain();
}
else{
lab.setForeground(Color.red);
lab.setText("登陆失败! 密码或账号错误!");
}
}catch(ClassNotFoundException e1){
e1.printStackTrace();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
assign.addActionListener(new ActionListener(){ // 注册按钮，点击进入到第三层界面输入学号
public void actionPerformed(ActionEvent e){
frame.dispose();
new Zhuce();
}
}
);
reset.addActionListener(new ActionListener(){ // 重置按钮
public void actionPerformed(ActionEvent e){
nameText.setText(""); //用户名重置
passwdText.setText(""); //密码重置
}
}
);
}
public static void main(String args[]) {
Login log= new Login();
log.login();
}
class ImagePanel extends JLabel{ //构建一个图片容器
private static final long serialVersionUID = 1L;
protected void paintComponent(Graphics g){
super.paintComponent(g);
ImageIcon img = new ImageIcon("D:\\Login.jpg");
g.drawImage(img.getImage(),0,0,this);
}
}
}