GUI登陆界面

import java.awt.Component;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class Test extends JFrame {
JTextField jt;
JPasswordField jp;
Font f1 = new Font("", Font.BOLD, 20);

public Test() {

	setTitle("主窗口");
	setBounds(100, 100, 607, 469);
	setLayout(null);
	setDefaultCloseOperation(2);
	setIconImage(new ImageIcon("image\\icon.png").getImage());

	Icon image1 = new ImageIcon("image\\top.png");
	JLabel jl1 = new JLabel(image1);
	jl1.setBounds(0, 0, 607, 150);
	add(jl1);

	JLabel jl2 = new JLabel("用 户 名:");
	jl2.setBounds(140, 160, 100, 35);
	jl2.setFont(f1);
	add(jl2);

	jt = new JTextField();
	jt.setBounds(230, 160, 200, 35);
	add(jt);

	JLabel jl3 = new JLabel("密     码:");
	jl3.setFont(f1);
	jl3.setBounds(140, 220, 100, 35);
	add(jl3);

	jp = new JPasswordField();
	jp.setBounds(230, 220, 200, 35);
	add(jp);

	JButton jb = new JButton("登录");
	jb.setBounds(180, 310, 80, 30);
	jb.addActionListener(new ActionListener() {

		@Override
		public void actionPerformed(ActionEvent arg0) {
			Boolean g=false;
			String str = jt.getText();
			String str1 = jp.getText();
			String str2 = str + "," + str1;
			File f = new File("file/gy.txt");
			try {
				if (!f.exists()) {
					f.createNewFile();
				}
				FileReader fr = new FileReader(f);
				BufferedReader bd = new BufferedReader(fr);
				String len = null;
				while ((len=bd.readLine()) != null) {
					if (len.equals(str2)) {
						new denglu(str).setVisible(true);
						g=true;
					}
					
				}
				if(!g){
					JOptionPane.showMessageDialog(null, "该用户不存在，请注册");
					jt.setText("");
					jp.setText("");
					
				}
				

			} catch (Exception e) {
				e.printStackTrace();
			}
			//dispose();

		}
	});
	add(jb);

	JButton jb1 = new JButton("注册");
	jb1.addActionListener(new ActionListener() {

		@Override
		public void actionPerformed(ActionEvent arg0) {
			// TODO Auto-generated method stub
			new zhuce().setVisible(true);
			dispose();
		}
	});
	jb1.setBounds(300, 310, 80, 30);
	add(jb1);

}

public static void main(String[] args) {
	new Test().setVisible(true);
}

}