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

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

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

add(logoLabel);

userNameLabel = new JLabel("̞:");

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。