generate Captcha BufferedImage - Java 2D Graphics

Java examples for 2D Graphics:Image Captcha

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Description

generate Captcha BufferedImage

Demo Code


//package com.java2s;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

public class Main {
    public static void main(String[] argv) throws Exception {
        String code = "java2s.com";
        System.out.println(genCaptcha(code));
    }//  www. j av  a  2  s  . c om

    private static Random random = new Random();
    private static int width = 80;
    private static int height = 26;
    private static int lines = 40;

    public static BufferedImage genCaptcha(String code) {
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
        g.setColor(getRandColor(110, 133));
        // 
        drowCode(g, code);
        // 
        for (int i = 0; i <= lines; i++) {
            drowLine(g);
        }
        g.dispose();
        return image;
    }

    private static Color getRandColor(int fc, int bc) {
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc - 16);
        int g = fc + random.nextInt(bc - fc - 14);
        int b = fc + random.nextInt(bc - fc - 18);
        return new Color(r, g, b);
    }

    private static String drowCode(Graphics g, String code) {
        int margin = width / code.length();
        for (int i = 0; i < code.length(); ++i) {
            g.setFont(getFont());
            g.setColor(getRandColor(0, 100));
            g.translate(random.nextInt(3), random.nextInt(3));
            g.drawString(String.valueOf(code.charAt(i)), margin * i, 16);
        }
        return code;
    }

    private static void drowLine(Graphics g) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(13);
        int yl = random.nextInt(15);
        g.drawLine(x, y, x + xl, y + yl);
    }

    private static Font getFont() {
        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    }
}

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