Java生成随机验证码图片并进行Base64编码

package com.pohoocredit.profitcard.backend.utils;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.RenderingHints;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.Arrays;import java.util.Random;import javax.imageio.ImageIO;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;/** * 图片验证码随机生成后，并进行base64转换，也可将base64图片字符串转换为图片生成 */public class RandomImgCodeUtil {    private static Random random = new Random();    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);        int g = fc + random.nextInt(bc - fc);        int b = fc + random.nextInt(bc - fc);        return new Color(r, g, b);    }    private static int getRandomIntColor() {        int[] rgb = getRandomRgb();        int color = 0;        for (int c : rgb) {            color = color << 8;            color = color | c;        }        return color;    }    private static int[] getRandomRgb() {        int[] rgb = new int[3];        for (int i = 0; i < 3; i++) {            rgb[i] = random.nextInt(255);        }        return rgb;    }    private static void shear(Graphics g, int w1, int h1, Color color) {        shearX(g, w1, h1, color);        shearY(g, w1, h1, color);    }    private static void shearX(Graphics g, int w1, int h1, Color color) {        int period = random.nextInt(2);        boolean borderGap = true;        int frames = 1;        int phase = random.nextInt(2);        for (int i = 0; i < h1; i++) {            double d = (double) (period >> 1)                    * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);            g.copyArea(0, i, w1, 1, (int) d, 0);            if (borderGap) {                g.setColor(color);                g.drawLine((int) d, i, 0, i);                g.drawLine((int) d + w1, i, w1, i);            }        }    }    private static void shearY(Graphics g, int w1, int h1, Color color) {        int period = random.nextInt(40) + 10; // 50;        boolean borderGap = true;        int frames = 20;        int phase = 7;        for (int i = 0; i < w1; i++) {            double d = (double) (period >> 1)                    * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);            g.copyArea(i, 0, 1, h1, 0, (int) d);            if (borderGap) {                g.setColor(color);                g.drawLine(i, (int) d, i, 0);                g.drawLine(i, (int) d + h1, i, h1);            }        }    }    /**     * 生成指定长度的随机数字和字母     * @param length     * @return     */    public static String getStringRandom(int length) {        String val = "";        Random random = new Random();        for (int i = 0; i < length; i++) {            String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";            switch (charOrNum) {                case "char":                    int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;                    val += (char) (random.nextInt(26) + temp);                    break;                case "num":                    val += String.valueOf(random.nextInt(10));                    break;            }        }        return val;    }    /**     * Base64编码的验证码图片     * @param w     * @param h     * @param code     * @return     * @throws Exception     */    public static String imageToBase64(int w, int h, String code) throws Exception {        int verifySize = code.length();        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);        Random rand = new Random();        Graphics2D g2 = image.createGraphics();        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);        Color[] colors = new Color[5];        Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA,                Color.ORANGE, Color.PINK, Color.YELLOW };        float[] fractions = new float[colors.length];        for (int i = 0; i < colors.length; i++) {            colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];            fractions[i] = rand.nextFloat();        }        Arrays.sort(fractions);        g2.setColor(Color.GRAY);// 设置边框色        g2.fillRect(0, 0, w, h);        Color c = getRandColor(200, 250);        g2.setColor(c);// 设置背景色        g2.fillRect(0, 2, w, h - 4);        // 绘制干扰线        Random random = new Random();        g2.setColor(getRandColor(160, 200));// 设置线条的颜色        for (int i = 0; i < 20; i++) {            int x = random.nextInt(w - 1);            int y = random.nextInt(h - 1);            int xl = random.nextInt(6) + 1;            int yl = random.nextInt(12) + 1;            g2.drawLine(x, y, x + xl + 40, y + yl + 20);        }        // 添加噪点        float yawpRate = 0.05f;// 噪声率        int area = (int) (yawpRate * w * h);        for (int i = 0; i < area; i++) {            int x = random.nextInt(w);            int y = random.nextInt(h);            int rgb = getRandomIntColor();            image.setRGB(x, y, rgb);        }        shear(g2, w, h, c);// 使图片扭曲        g2.setColor(getRandColor(100, 160));        int fontSize = h - 4;        Font font = new Font("Arial", Font.ITALIC, fontSize);        g2.setFont(font);        char[] chars = code.toCharArray();        for (int i = 0; i < verifySize; i++) {            AffineTransform affine = new AffineTransform();            affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1),                    (w / verifySize) * i + fontSize / 2, h / 2);            g2.setTransform(affine);            g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);        }        g2.dispose();        ByteArrayOutputStream baos = new ByteArrayOutputStream();        ImageIO.write(image, "jpg", baos);        return new BASE64Encoder().encode(baos.toByteArray());    }    /**     * 将Base64位编码的图片进行解码，并保存到指定目录     *     * @param base64     *            base64编码的图片信息     * @return     */    public static void base64ToImage(String base64) {        BASE64Decoder decoder = new BASE64Decoder();        try {            File file = new File("D:/test.jpg");            FileOutputStream write = new FileOutputStream(file);            byte[] decoderBytes = decoder.decodeBuffer(base64);            write.write(decoderBytes);            write.close();        } catch (IOException e) {            e.printStackTrace();        }    }    public static void main(String[] args) throws Exception {        base64ToImage(imageToBase64(120, 40, getStringRandom(4)));    }}

参考：http://blog.csdn.net/danmo1993/article/details/76618597