get Captcha Image - Java 2D Graphics

Java examples for 2D Graphics:Image Captcha

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Description

get Captcha Image

Demo Code


import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

public class Main{
    private static final char[] SIMPLE = { '0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9' };
    private static final char[] MEDIUM = { 'a', 'b', 'c', 'd', 'e', 'f',
            'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r',
            's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',
            'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
            'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'Z', 'Y', 'Z' };
    private static final char[] HARD = { '0', '1', '2', '3', '4', '5', '6',
            '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
            'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u',
            'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
            'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
            'T', 'U', 'V', 'W', 'Z', 'Y', 'Z' };
    private static Random random = new Random();
    //from   w  w  w .  j  av a 2  s.co m
    public static Object[] getCaptchaImage(int width, int height,
            int fontSize, int lineCount, int pointCount, boolean border,
            boolean colours, ComplexLevel complexLevel) {

        Object[] object = new Object[2];
        //
        StringBuffer sb = new StringBuffer();
        //
        int position = 0;

        //
        BufferedImage bi = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        //
        Graphics grap = bi.getGraphics();
        //
        grap.fillRect(0, 0, width, height);
        //
        grap.setFont(new Font("Arial", Font.BOLD, fontSize));
        //
        grap.setColor(Color.BLACK);
        //
        if (border)
            grap.drawRect(0, 0, width - 1, height - 1);
        switch (complexLevel) {
        case SIMPLE:
            for (int i = 0; i < 4; i++) {
                //
                if (colours)
                    grap.setColor(new Color(random.nextInt(255), random
                            .nextInt(255), random.nextInt(255)));
                position = random.nextInt(SIMPLE.length);
                //
                grap.drawString(
                        SIMPLE[position] + "",
                        (i * ((width - 10) / 4)) + 5
                                + random.nextInt(((width - 10) / 4) / 2),
                        height / 2 + random.nextInt(height / 2));
                sb.append(SIMPLE[position]);
            }
            break;
        case MEDIUM:
            //
            for (int k = 0; k < pointCount; k++) {
                grap.drawRect(random.nextInt(width),
                        random.nextInt(height), 1, 1);
            }
            for (int i = 0; i < 5; i++) {
                //
                if (colours)
                    grap.setColor(new Color(random.nextInt(255), random
                            .nextInt(255), random.nextInt(255)));
                position = random.nextInt(MEDIUM.length);
                //
                grap.drawString(
                        MEDIUM[position] + "",
                        (i * ((width - 10) / 5)) + 5
                                + random.nextInt(((width - 10) / 5) / 2),
                        height / 2 + random.nextInt(height / 2));
                sb.append(MEDIUM[position]);
            }
            break;
        case HARD:
            //
            for (int j = 0; j < lineCount; j++) {
                grap.drawLine(random.nextInt(width),
                        random.nextInt(height), random.nextInt(width),
                        random.nextInt(height));
            }
            //
            for (int k = 0; k < pointCount; k++) {
                grap.drawRect(random.nextInt(width),
                        random.nextInt(height), 1, 1);
            }
            for (int i = 0; i < 6; i++) {
                //
                if (colours)
                    grap.setColor(new Color(random.nextInt(255), random
                            .nextInt(255), random.nextInt(255)));
                position = random.nextInt(HARD.length);
                //
                grap.drawString(
                        HARD[position] + "",
                        (i * ((width - 10) / 6)) + 5
                                + random.nextInt(((width - 10) / 6) / 2),
                        height / 2 + random.nextInt(height / 2));
                sb.append(HARD[position]);
            }
            break;
        default:
            break;
        }
        //Graphics
        grap.dispose();

        object[0] = bi;
        object[1] = sb.toString();

        return object;
    }
}

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