java把指定文字输出为图片流，支持文字换行

public class IamgeUtils {

    private static final int WIDTH = 350;
    private static final int HEIGHT = 100;

    private static Random random = new Random();

    public static void main(String[] args) throws IOException {
        String[] verifyCodes = new String[] { "你好", "第二行,******", "第三行" };
        String result = outputImage(verifyCodes);
        write2Pic(result);
    }

    public static int r(int min, int max) {
        int num = 0;
        num = random.nextInt(max - min) + min;
        return num;
    }

    public static void write2Pic(String sourceByte) {

        FileOutputStream output;
        try {
            output = new FileOutputStream(new File("F:/123.jpg"));
            output.write(Base64.decodeBase64(sourceByte));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 输出指定文本图片流
     * 
     * @param w
     * @param h
     * @param os
     * @param code
     * @throws IOException
     */
    public static String outputImage(String[] verifyCodes) throws IOException {
        BufferedImage image = new BufferedImage(WIDTH, HEIGHT, 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, WIDTH, HEIGHT);

        Color c = getRandColor(200, 250);
        g2.setColor(c);// 设置背景色
        g2.fillRect(0, 2, WIDTH, HEIGHT - 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(WIDTH - 1);
            int y = random.nextInt(HEIGHT - 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 * WIDTH * HEIGHT);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(WIDTH);
            int y = random.nextInt(HEIGHT);
            int rgb = getRandomIntColor();
            image.setRGB(x, y, rgb);
        }

        shear(g2, WIDTH, HEIGHT, c);// 使图片扭曲

        g2.setColor(getRandColor(100, 160));
        int fontSize = HEIGHT;
        Font font = new Font("宋体", Font.ITALIC, 20);
        g2.setFont(font);

        FontMetrics fm = sun.font.FontDesignMetrics.getMetrics(font);

        int y = fm.getHeight();
        int h = fm.getHeight();
        for (int i = 0; i < verifyCodes.length; i++) {
            g2.drawString(verifyCodes[i], (int) (h * (0.8)), (int) (i * y * (0.8)) + 24);
        }
        g2.dispose();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", out);
        String bytePic = Base64.encodeBase64String(out.toByteArray());// Base64.encodeBase64String(out.toByteArray());
        System.out.println(bytePic);
        return bytePic;
    }

    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) + 50; // 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);
            }

        }

    }
}