content: package com.gpmall.user.utils;
  
  import com.gpmall.user.dal.entitys.ImageResult;
  import sun.misc.BASE64Encoder;
  
  import javax.imageio.ImageIO;
  import java.awt.*;
  import java.awt.geom.AffineTransform;
  import java.awt.image.BufferedImage;
  import java.io.*;
  import java.util.Arrays;
  import java.util.Random;
  
  /**
   * 腾讯课堂搜索【咕泡学院】
   * 官网：www.gupaoedu.com
   * 风骚的Mic 老师
   * create-date: 2019/8/6-14:11
   */
  public class VerifyCodeUtils {
  
      //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 = "1234567890ABCDEFGHIJKLMNPQRSTUVWXYZ";
      private static 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 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();
          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);
      }
  
      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);
              }
  
          }
  
      }
      public static ImageResult VerifyCode(int w, int h, int size) throws IOException {
          BASE64Encoder encoder = new BASE64Encoder();
          ImageResult rs = new ImageResult();
          String code = generateVerifyCode(size).toLowerCase();
          rs.setCode(code);
          ByteArrayOutputStream data = new ByteArrayOutputStream();
          outputImage(w, h, data, code);
          rs.setImg(encoder.encode(data.toByteArray()));
          return rs;
      }
  
  }
  