本文实例为大家分享了java登录界面的具体实现代码，供大家参考，具体内容如下

1. Login.java

package wzb; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Panel; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.util.Random; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPasswordField; import javax.swing.JTextField; public class Login extends JFrame implements ActionListener { String userName; String password; String captcha; public static String randomcaptcha; public JLabel logoLabel, userNameLabel, passwordLabel, captchaLabel; public JTextField userNameInput, captchaInput; public JPasswordField passwordInput; public JButton login, logout,change; public Panel panel; public Login() { setTitle("µÇ¼½çÃæ"); setSize(400, 300); setLocationRelativeTo(null); init(); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setResizable(false); } public void init() { setLayout(null); // logoLabel= new JLabel(); // logoLabel.setIcon(new ImageIcon("E:eclipsestudent3welcome.gif")); logoLabel = new JLabel(new ImageIcon("welcome.gif")); logoLabel.setBounds(125, 10, 150, 70); add(logoLabel); userNameLabel = new JLabel("Óû§Ãû:"); userNameLabel.setBounds(90, 90, 60, 40); add(userNameLabel); userNameInput = new JTextField(); userNameInput.setBounds(150, 100, 150, 20); add(userNameInput); passwordLabel = new JLabel("ÃÜ¡¡Âë:"); passwordLabel.setBounds(90, 120, 60, 40); add(passwordLabel); passwordInput = new JPasswordField(); passwordInput.setBounds(150, 130, 150, 20); add(passwordInput); captchaLabel = new JLabel("ÑéÖ¤Âë:"); captchaLabel.setBounds(90, 150, 60, 40); add(captchaLabel); captchaInput = new JTextField(); captchaInput.setBounds(150, 160, 70, 20); add(captchaInput); panel = new PanelDemo(); panel.setBounds(220, 160, 80, 20); add(panel); change = new JButton("»»Ò»»»"); change.setBounds(300, 160, 80, 20); change.setContentAreaFilled(false); change.setBorderPainted(false); add(change); login = new JButton("µÇ¼£¨L£©", new ImageIcon("login.gif")); login.setBounds(70, 200, 120, 30); login.setMnemonic(KeyEvent.VK_L); add(login); logout = new JButton("Í˳ö£¨X£©", new ImageIcon("exit.gif")); logout.setBounds(210, 200, 120, 30); logout.setMnemonic(KeyEvent.VK_X); add(logout); userNameInput.addActionListener(this); passwordInput.addActionListener(this); captchaInput.addActionListener(this); login.addActionListener(this); logout.addActionListener(this); change.addActionListener(this); } public void actionPerformed(ActionEvent e) { userName = userNameInput.getText(); password = new String(passwordInput.getPassword()); captcha = captchaInput.getText(); if (e.getSource() == change) { panel.repaint(); } if (e.getSource() == login) { if ((userName.equals("w")) && (password.equals("w"))) { if (captcha.equals(randomcaptcha)) { JOptionPane.showMessageDialog(this, "»¶Ó­µÇ½!"); } else { JOptionPane.showMessageDialog(this, "ÑéÖ¤Âë´íÎó!"); panel.repaint(); } } else { JOptionPane.showMessageDialog(this, "Óû§Ãû»òÃÜÂë´íÎó!"); } } if (e.getSource() == logout) { JOptionPane.showMessageDialog(this, "»¶Ó­Ï´ÎÔÙÀ´£¡"); //System.exit(0); dispose(); } } public static void main(String[] args) { new Login(); } } class PanelDemo extends Panel { public void paint(Graphics g) { int width = 80; int height = 20; g.setColor(Color.LIGHT_GRAY); g.fillRect(0, 0, width, height); g.setColor(Color.BLACK); g.drawRect(0, 0, width, height); Random rd = new Random(); for (int i = 0; i < 100; i++) { int x = rd.nextInt(width) - 2; int y = rd.nextInt(height) - 2; g.setColor(Color.RED); g.drawOval(x, y, 2, 2); } g.setFont(new Font("ºÚÌå", Font.BOLD, 20)); g.setColor(Color.BLUE); char[] c = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < 4; i++) { int index = rd.nextInt(c.length); sb.append(c[index] + " "); } g.drawString(sb.toString(), 0, 18); String str = sb.toString().replaceAll(" ", ""); Login.randomcaptcha = str; } }

2. 捕获.PNG

以上就是本文的全部内容，希望对大家学习java程序设计有所帮助。