图形登录与验证码

package login;

import java.awt.Color;


import java.awt.EventQueue;
import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import java.awt.Color;

import java.util.Random;
import java.util.UUID;
import java.util.concurrent.ThreadLocalRandom;

public class show {

    private JFrame frame;
    private JPasswordField passwordField;
    private JTextField jtfField;
    private boolean isLogin = false;
    private boolean isYanzheng = false;
    private String code;
    
    /**
     * Launch the application.
     */
    
    
    
    
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    show window = new show();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public show() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    
    
    private void initialize() {

        String userName = "xrj";
        String userPwd = "xrj";
        

        frame = new JFrame();
        frame.setTitle("系统登录界面");
        frame.setBounds(100, 100, 500, 250);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        Label label = new Label("登录名：");
        label.setAlignment(Label.CENTER);
        label.setBounds(116, 49, 50, 23);
        frame.getContentPane().add(label);

        Label label_1 = new Label("密码：");
        label_1.setAlignment(Label.CENTER);
        label_1.setBounds(116, 85, 50, 23);
        frame.getContentPane().add(label_1);

        Label label_2 = new Label("忘记密码");
        label_2.setBounds(350, 85, 60, 23);
        frame.getContentPane().add(label_2);

        Label label_3 = new Label("未登录");
        label_3.setForeground(new Color(255, 0, 0));
        label_3.setBounds(350, 49, 40, 23);
        frame.getContentPane().add(label_3);
        
        Label label_4 = new Label("验证码：");
        label_4.setAlignment(Label.CENTER);
        label_4.setBounds(116, 120, 50, 23);
        frame.getContentPane().add(label_4);
        
        String code = UUID.randomUUID().toString().substring(0, 4);
        Label label_5 = new Label(code);
        label_5.setAlignment(Label.CENTER);
        label_5.setBounds(250, 120, 50, 23);
        frame.getContentPane().add(label_5);
        
        Label label_6 = new Label("等待验证");
        label_6.setForeground(new Color(255, 0, 0));
        label_6.setBounds(350, 120, 40, 23);
        frame.getContentPane().add(label_6);
        

        JFormattedTextField formattedTextField = new JFormattedTextField();
        formattedTextField.setBounds(172, 49, 166, 23);
        frame.getContentPane().add(formattedTextField);

        passwordField = new JPasswordField();
        passwordField.setBounds(172, 85, 166, 23);
        frame.getContentPane().add(passwordField);
        
        jtfField = new JTextField();
        jtfField.setBounds(172, 120, 100, 23);
        frame.getContentPane().add(jtfField);

        JButton button2 = new JButton("快速注册");
        button2.setBackground(new Color(255, 255, 255));
        button2.setBounds(300, 180, 100, 23);
        frame.getContentPane().add(button2);
        
        JButton button1 = new JButton("登录");
        button1.setBackground(new Color(255, 255, 255));
        button1.setBounds(126, 180, 100, 23);
        frame.getContentPane().add(button1);
        button1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String getUserName = formattedTextField.getText();
                String getUserPwd = passwordField.getText();
                String getUseryanzh = jtfField.getText();
                if (code.equals(getUseryanzh)) {
                    isYanzheng = true;
                } else {
                    isYanzheng = false;
                }
                if (isYanzheng) {
                    JOptionPane.showMessageDialog(null, "验证成功!", "消息", JOptionPane.PLAIN_MESSAGE);
                    label_6.setText("验证通过");
                    label_6.setForeground(Color.BLUE);
                } else {
                    JOptionPane.showMessageDialog(null, "验证失败!", "消息", JOptionPane.WARNING_MESSAGE);
                    label_6.setText("验证失败");
                    label_6.setForeground(Color.RED);
                }
                if (userName.equals(getUserName) && userPwd.equals(getUserPwd)&&(code.equals(getUseryanzh)) ){
                    isLogin = true;
                } else {
                    isLogin = false;
                }
                if (isLogin) {
                    JOptionPane.showMessageDialog(null, "登录成功!", "消息", JOptionPane.PLAIN_MESSAGE);
                    label_3.setText("已登录");
                    label_3.setForeground(Color.BLUE);
                } else {
                    JOptionPane.showMessageDialog(null, "登录失败!", "消息", JOptionPane.WARNING_MESSAGE);
                    label_3.setText("未登录");
                    label_3.setForeground(Color.RED);
                }
   
            }
        });
    }
}