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 {
 
    // 設(shè)置驗(yàn)證碼的寬度和高度
    private static final int WIDTH = 160;
    private static final int HEIGHT = 50;
 
    // 驗(yàn)證碼字符集，可以根據(jù)需要擴(kuò)展
    private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
 
    // 隨機(jī)數(shù)生成器
    private static final Random random = new Random();
 
    // 生成驗(yàn)證碼的方法
    public static void generateCaptcha(OutputStream out) throws IOException {
        // 創(chuàng)建一個(gè)空白圖像畫布
        BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = image.createGraphics();
 
        // 設(shè)置圖像的背景色為白色
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, WIDTH, HEIGHT);
 
        // 繪制干擾線
        drawNoiseLines(graphics);
 
        // 繪制驗(yàn)證碼字符
        String captchaText = generateRandomText();
        drawCaptchaText(graphics, captchaText);
 
        // 輸出驗(yàn)證碼圖像
        ImageIO.write(image, "JPEG", out);
        graphics.dispose();
    }
 
    // 生成一個(gè)隨機(jī)的驗(yàn)證碼字符串
    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();
    }
 
    // 在圖像上繪制驗(yàn)證碼字符
    private static void drawCaptchaText(Graphics2D graphics, String captchaText) {
        // 設(shè)置隨機(jī)的字體和顏色
        graphics.setFont(new Font("Arial", Font.BOLD, 40));
        for (int i = 0; i < captchaText.length(); i++) {
            char c = captchaText.charAt(i);
            graphics.setColor(getRandomColor());
            // 設(shè)置字符的位置
            graphics.drawString(String.valueOf(c), 20 + i * 25, 40);
        }
    }
 
    // 繪制干擾線
    private static void drawNoiseLines(Graphics2D graphics) {
        for (int i = 0; i < 10; i++) {
            // 隨機(jī)生成干擾線的坐標(biāo)
            int x1 = random.nextInt(WIDTH);
            int y1 = random.nextInt(HEIGHT);
            int x2 = random.nextInt(WIDTH);
            int y2 = random.nextInt(HEIGHT);
 
            // 設(shè)置干擾線的顏色
            graphics.setColor(getRandomColor());
            // 繪制干擾線
            graphics.drawLine(x1, y1, x2, y2);
        }
    }
 
    // 獲取一個(gè)隨機(jī)顏色
    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，用于測(cè)試
    public static void main(String[] args) {
        try {
            // 模擬輸出驗(yàn)證碼圖像
            OutputStream out = System.out;  // 這里使用System.out模擬輸出流
            generateCaptcha(out);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}