通过Java实现带干扰线的验证码

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
 
public class CaptchaGenerator {
 
    // 设置验证码的宽度和高度
    private static final int WIDTH = 160;
    private static final int HEIGHT = 50;
 
    // 验证码字符集，可以根据需要扩展
    private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
 
    // 随机数生成器
    private static final Random random = new Random();
 
    // 生成验证码的方法
    public static void generateCaptcha(OutputStream out) throws IOException {
        // 创建一个空白图像画布
        BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = image.createGraphics();
 
        // 设置图像的背景色为白色
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, WIDTH, HEIGHT);
 
        // 绘制干扰线
        drawNoiseLines(graphics);
 
        // 绘制验证码字符
        String captchaText = generateRandomText();
        drawCaptchaText(graphics, captchaText);
 
        // 输出验证码图像
        ImageIO.write(image, "JPEG", out);
        graphics.dispose();
    }
 
    // 生成一个随机的验证码字符串
    private static String generateRandomText() {
        StringBuilder captchaText = new StringBuilder();
        for (int i = 0; i < 6; i++) {
            int index = random.nextInt(CHARACTERS.length());
            captchaText.append(CHARACTERS.charAt(index));
        }
        return captchaText.toString();
    }
 
    // 在图像上绘制验证码字符
    private static void drawCaptchaText(Graphics2D graphics, String captchaText) {
        // 设置随机的字体和颜色
        graphics.setFont(new Font("Arial", Font.BOLD, 40));
        for (int i = 0; i < captchaText.length(); i++) {
            char c = captchaText.charAt(i);
            graphics.setColor(getRandomColor());
            // 设置字符的位置
            graphics.drawString(String.valueOf(c), 20 + i * 25, 40);
        }
    }
 
    // 绘制干扰线
    private static void drawNoiseLines(Graphics2D graphics) {
        for (int i = 0; i < 10; i++) {
            // 随机生成干扰线的坐标
            int x1 = random.nextInt(WIDTH);
            int y1 = random.nextInt(HEIGHT);
            int x2 = random.nextInt(WIDTH);
            int y2 = random.nextInt(HEIGHT);
 
            // 设置干扰线的颜色
            graphics.setColor(getRandomColor());
            // 绘制干扰线
            graphics.drawLine(x1, y1, x2, y2);
        }
    }
 
    // 获取一个随机颜色
    private static Color getRandomColor() {
        int r = random.nextInt(256);
        int g = random.nextInt(256);
        int b = random.nextInt(256);
        return new Color(r, g, b);
    }
 
    // 主方法，用于测试
    public static void main(String[] args) {
        try {
            // 模拟输出验证码图像
            OutputStream out = System.out;  // 这里使用System.out模拟输出流
            generateCaptcha(out);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}