import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.LinearGradientPaint;import java.awt.Paint;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Arrays;import java.util.Random;import javax.imageio.ImageIO;public class VerifyCodeUtils{public static final String VERIFY_CODES = "123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";/** * 使用系统默认字符源生成验证码 * @param verifySize验证码长度 * @return */public static 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 static 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();}/** * 生成随机验证码文件,并返回验证码值 * @param w * @param h * @param outputFile * @param verifySize * @return * @throws IOException */public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{String verifyCode = generateVerifyCode(verifySize);outputImage(w, h, outputFile, verifyCode);return verifyCode;}/** * 输出随机验证码图片流,并返回验证码值 * @param w * @param h * @param os * @param verifySize * @return * @throws IOException */public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{String verifyCode = generateVerifyCode(verifySize);outputImage(w, h, os, verifyCode);return verifyCode;}/** * 生成指定验证码图像文件 * @param w * @param h * @param outputFile * @param code * @throws IOException */public static void outputImage(int w, int h, File outputFile, String code) throws IOException{if(outputFile == null){return;}File dir = outputFile.getParentFile();if(!dir.exists()){dir.mkdirs();}try{outputFile.createNewFile();FileOutputStream fos = new FileOutputStream(outputFile);outputImage(w, h, fos, code);fos.close();} catch(IOException e){throw e;}}/** * 输出指定验证码图片流 * @param w * @param h * @param os * @param code * @throws IOException */public static void outputImage(int w,int h,OutputStream os,String code) throws IOException{int verifySize = code.length();BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);Random rand = new Random();Graphics2D g2 = image.createGraphics();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);Paint linearPaint = new LinearGradientPaint(0, 0, w, h, fractions, colors);Paint linearPaint2 = new LinearGradientPaint(0, 0, w, h, new float[]{0.3f, .6f, .8f, .9f}, new Color[]{Color.BLUE, Color.BLACK, Color.GREEN, Color.BLUE});//设置图片背景为白色g2.setPaint(Color.WHITE);g2.fillRect(0, 0, w, h);//设置图片渐变背景g2.setPaint(linearPaint);g2.fillRoundRect(0, 0, w, h, 5, 5);g2.setPaint(linearPaint2);int fontSize = (int) (Math.min(w/verifySize, h));Font font = new Font("微软雅黑", Font.BOLD, 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 / verifySize) * i, h/2 + fontSize /2);}g2.dispose();ImageIO.write(image, "jpg", os);}public static void main(String[] args) throws IOException{File dir = new File("F:/verifies");int w = 200, h = 80;for(int i = 0; i < 100; i++){String verifyCode = generateVerifyCode(4);File file = new File(dir, verifyCode + ".jpg");outputImage(w, h, file, verifyCode);}}}
