package net.sc.common.util;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;public class VerifyCodeImageUtil {	// 使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符	public static final String VERIFY_CODES = "23456789aABCDdEeFfGHhJjKLMmNnPQRrSTtUVWXYyZ";	private static final Random random = new Random();	/**	 * 使用系统默认字符源生成验证码	 * 	 * @param verifySize	 *            验证码长度	 * @return	 */	public String generateVerifyCode(int verifySize) {		return generateVerifyCode(verifySize, VERIFY_CODES);	}	/**	 * 使用指定源生成验证码	 * 	 * @param verifySize	 *            验证码长度	 * @param sources	 *            验证码字符源	 * @return	 */	public String generateVerifyCode(int verifySize, String sources) {		if (sources == null || sources.length() == 0) {			sources = VERIFY_CODES;		}		int codesLen = sources.length();		Random rand = new Random(System.currentTimeMillis());		StringBuilder verifyCode = new StringBuilder(verifySize);		for (int i = 0; i < verifySize; i++) {			verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));		}		return verifyCode.toString();	}	/**	 * 绘制图片,输出指定验证码图片流	 * 	 * @param w	 * @param h	 * @param os	 * @param code	 * @throws IOException	 */	public ByteArrayOutputStream paintImage(int w, int h, String code) throws IOException {		ByteArrayOutputStream os = new ByteArrayOutputStream();		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("Algerian", 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();		ImageIO.write(image, "jpg", os);		os.close();		return os;	}	private 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 int getRandomIntColor() {		int[] rgb = getRandomRgb();		int color = 0;		for (int c : rgb) {			color = color << 8;			color = color | c;		}		return color;	}	private int[] getRandomRgb() {		int[] rgb = new int[3];		for (int i = 0; i < 3; i++) {			rgb[i] = random.nextInt(255);		}		return rgb;	}	private void shear(Graphics g, int w1, int h1, Color color) {		shearX(g, w1, h1, color);		shearY(g, w1, h1, color);	}	private 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 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);			}		}	}	public static void main(String[] args) throws IOException {		VerifyCodeImageUtil vciu = new VerifyCodeImageUtil();		File dir = new File("/home/matrix/VerifyCodeImage/");		int w = 200, h = 80;		for (int i = 0; i < 50; i++) {			String verifyCode = vciu.generateVerifyCode(4);			FileOutputStream fos = new FileOutputStream(new File(dir, verifyCode + ".jpg"));			ByteArrayOutputStream os = vciu.paintImage(w, h, verifyCode);			fos.write(os.toByteArray());			fos.close();		}	}}