破解难度比较的图片验证码生成——从Python到Java的实现详解

import random
import string
from PIL import Image, ImageDraw, ImageFont, ImageFilter

# 生成简单验证码
def generate_simple_captcha(length=4):
    characters = string.ascii_uppercase + string.digits
    captcha_text = ''.join(random.choice(characters) for _ in range(length))
    return captcha_text

# 绘制验证码图像
def draw_captcha(captcha_text, width=120, height=40):
    image = Image.new('RGB', (width, height), (255, 255, 255))
    font = ImageFont.truetype("arial.ttf", 24)
    draw = ImageDraw.Draw(image)

    # 添加文本
    for i, char in enumerate(captcha_text):
        draw.text((10 + i * 20, 5), char, font=font, fill=(random.randint(0, 150), random.randint(0, 150), random.randint(0, 150)))

    # 添加干扰线
    for _ in range(5):
        x1, y1 = random.randint(0, width), random.randint(0, height)
        x2, y2 = random.randint(0, width), random.randint(0, height)
        draw.line(((x1, y1), (x2, y2)), fill=(random.randint(0, 150), random.randint(0, 150), random.randint(0, 150)), width=1)

    # 添加噪点
    for _ in range(50):
        x, y = random.randint(0, width), random.randint(0, height)
        draw.point((x, y), fill=(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))

    # 模糊处理
    image = image.filter(ImageFilter.BLUR)

    return image

# 比较破解难度
def compare_captcha_difficulty():
    simple_captcha_text = generate_simple_captcha()
    simple_captcha_image = draw_captcha(simple_captcha_text)
    
    # 显示验证码
    simple_captcha_image.show(title="Simple Captcha")

    print(f"简单验证码: {simple_captcha_text}")

if __name__ == "__main__":
    compare_captcha_difficulty()

# 生成复杂验证码
def generate_complex_captcha(length=6):
    characters = string.ascii_uppercase + string.ascii_lowercase + string.digits
    captcha_text = ''.join(random.choice(characters) for _ in range(length))
    return captcha_text

def compare_captcha_difficulty():
    simple_captcha_text = generate_simple_captcha()
    complex_captcha_text = generate_complex_captcha()

    simple_captcha_image = draw_captcha(simple_captcha_text)
    complex_captcha_image = draw_captcha(complex_captcha_text)

    # 显示验证码
    simple_captcha_image.show(title="Simple Captcha")
    complex_captcha_image.show(title="Complex Captcha")

    print(f"简单验证码: {simple_captcha_text}")
    print(f"复杂验证码: {complex_captcha_text}")

if __name__ == "__main__":
    compare_captcha_difficulty()

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.*;

public class CaptchaComparison {

    // 生成简单验证码
    public static String generateSimpleCaptcha(int length) {
        String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        return generateCaptchaText(characters, length);
    }

    // 生成验证码文本
    private static String generateCaptchaText(String characters, int length) {
        Random rand = new Random();
        StringBuilder captchaText = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            captchaText.append(characters.charAt(rand.nextInt(characters.length())));
        }
        return captchaText.toString();
    }

    // 绘制验证码图像
    public static BufferedImage drawCaptcha(String captchaText, int width, int height) {
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = image.createGraphics();
        
        // 设置背景
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);

        // 设置字体
        g.setFont(new Font("Arial", Font.BOLD, 24));

        // 绘制字符
        Random rand = new Random();
        for (int i = 0; i < captchaText.length(); i++) {
            g.setColor(new Color(rand.nextInt(150), rand.nextInt(150), rand.nextInt(150)));
            g.drawString(String.valueOf(captchaText.charAt(i)), 10 + i * 20, 28);
        }

        g.dispose();
        return image;
    }

    // 显示验证码
    public static void displayCaptcha(BufferedImage image, String title) {
        JFrame frame = new JFrame(title);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(image.getWidth(), image.getHeight());
        JLabel label = new JLabel(new ImageIcon(image));
        frame.add(label);
        frame.pack();
        frame.setVisible(true);
    }

    // 比较破解难度
    public static void compareCaptchaDifficulty() {
        String simpleCaptcha = generateSimpleCaptcha(4);
        BufferedImage simpleCaptchaImage = drawCaptcha(simpleCaptcha, 120, 40);

        displayCaptcha(simpleCaptchaImage, "Simple Captcha");

        System.out.println("简单验证码: " + simpleCaptcha);
    }

    public static void main(String[] args) {
        compareCaptchaDifficulty();
    }
}

// 生成复杂验证码
public static String generateComplexCaptcha(int length) {
    String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    return generateCaptchaText(characters, length);
}

public static void compareCaptchaDifficulty() {
    String simpleCaptcha = generateSimpleCaptcha(4);
    String complexCaptcha = generateComplexCaptcha(6);

    BufferedImage simpleCaptchaImage = drawCaptcha(simpleCaptcha, 120, 40);
    BufferedImage complexCaptchaImage = drawCaptcha(complexCaptcha, 160, 40);

    displayCaptcha(simpleCaptchaImage, "Simple Captcha");
    displayCaptcha(complexCaptchaImage, "

Complex Captcha");

    System.out.println("简单验证码: " + simpleCaptcha);
    System.out.println("复杂验证码: " + complexCaptcha);
}