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本文實例為大家分享了java登錄界面的具體實現代碼，供大家參考，具體內容如下

1. Login.java

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									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("µÇÂ¼½çÃæ");

									  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:\\eclipse\\student3\\welcome.gif"));

									  logoLabel = new JLabel(new ImageIcon("welcome.gif"));

									  logoLabel.setBounds(125, 10, 150, 70);

									  add(logoLabel);

									  userNameLabel = new JLabel("ÓÃ»§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("µÇÂ¼£¨L£©", new ImageIcon("login.gif"));

									  login.setBounds(70, 200, 120, 30);

									  login.setMnemonic(KeyEvent.VK_L);

									  add(login);

									  logout = new JButton("ÍË³ö£¨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, "»¶Ó­µÇÂ½!");

									    } else {

									     JOptionPane.showMessageDialog(this, "ÑéÖ¤Âë´íÎó!");

									     panel.repaint();

									    }

									   } else {

									    JOptionPane.showMessageDialog(this, "ÓÃ»§Ãû»òÃÜÂë´íÎó!");

									   }

									  }

									  if (e.getSource() == logout) {

									   JOptionPane.showMessageDialog(this, "»¶Ó­ÏÂ´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;

									 }

									}