content: package org.superboot.utils;
  
  import javax.imageio.ImageIO;
  import java.awt.*;
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.Random;
  
  
  /**
   * <b> 验证码工具类 </b>
   * <p>
   * 功能描述:
   * </p>
   */
  public class CaptchaUtil {
  
      // 图片的宽度。
      private int width = 160;
      // 图片的高度。
      private int height = 40;
      // 验证码字符个数
      private int codeCount = 4;
      // 验证码干扰线数
      private int lineCount = 20;
      // 验证码
      private String code = null;
      // 验证码图片Buffer
      private BufferedImage buffImg = null;
      Random random = new Random();
  
      public CaptchaUtil() {
          creatImage();
      }
  
      public CaptchaUtil(int width, int height) {
          this.width = width;
          this.height = height;
          creatImage();
      }
  
      public CaptchaUtil(int width, int height, int codeCount) {
          this.width = width;
          this.height = height;
          this.codeCount = codeCount;
          creatImage();
      }
  
      public CaptchaUtil(int width, int height, int codeCount, int lineCount) {
          this.width = width;
          this.height = height;
          this.codeCount = codeCount;
          this.lineCount = lineCount;
          creatImage();
      }
  
      // 生成图片
      private void creatImage() {
          int fontWidth = width / codeCount;// 字体的宽度
          int fontHeight = height - 5;// 字体的高度
          int codeY = height - 8;
  
          // 图像buffer
          buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
          Graphics g = buffImg.getGraphics();
          //Graphics2D g = buffImg.createGraphics();
          // 设置背景色
          g.setColor(getRandColor(200, 250));
          g.fillRect(0, 0, width, height);
  
  
          // 设置字体
          //Font font1 = getFont(fontHeight);
          Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
          g.setFont(font);
  
          // 设置干扰线
          for (int i = 0; i < lineCount; i++) {
              int xs = random.nextInt(width);
              int ys = random.nextInt(height);
              int xe = xs + random.nextInt(width);
              int ye = ys + random.nextInt(height);
              g.setColor(getRandColor(1, 255));
              g.drawLine(xs, ys, xe, ye);
          }
  
          // 添加噪点
          float yawpRate = 0.01f;// 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);
  
              buffImg.setRGB(x, y, random.nextInt(255));
          }
  
          String str1 = randomStr(codeCount);// 得到随机字符
          this.code = str1;
          for (int i = 0; i < codeCount; i++) {
              String strRand = str1.substring(i, i + 1);
              g.setColor(getRandColor(1, 255));
              // g.drawString(a,x,y);
              // a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处
  
              g.drawString(strRand, i * fontWidth + 3, codeY);
          }
      }
  
      // 得到随机字符
      private String randomStr(int n) {
          String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
          String str2 = "";
          int len = str1.length() - 1;
          double r;
          for (int i = 0; i < n; i++) {
              r = (Math.random()) * len;
              str2 = str2 + str1.charAt((int) r);
          }
          return str2;
      }
  
      // 得到随机颜色
      private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
          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);
      }
  
      /**
       * 产生随机字体
       */
      private Font getFont(int size) {
          Random random = new Random();
          Font font[] = new Font[5];
          font[0] = new Font("Ravie", Font.PLAIN, size);
          font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
          font[2] = new Font("Fixedsys", Font.PLAIN, size);
          font[3] = new Font("Wide Latin", Font.PLAIN, size);
          font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
          return font[random.nextInt(5)];
      }
  
      // 扭曲方法
      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 void write(OutputStream sos) throws IOException {
          ImageIO.write(buffImg, "png", sos);
          sos.close();
      }
  
      public BufferedImage getBuffImg() {
          return buffImg;
      }
  
      public String getCode() {
          return code.toLowerCase();
      }
  
  //	/**
  //	 * 验证码
  //	 * @param request
  //	 * @param response
  //	 * @param session
  //	 * @throws IOException
  //	 */
  //	@RequestMapping("/code.jpg")
  //	public void getCode3(HttpServletRequest request, HttpServletResponse response, HttpSession session) throws IOException {
  //		int width = NumberUtils.toInt(request.getParameter("width"), 100);
  //		int height = NumberUtils.toInt(request.getParameter("height"), 30);
  //		int codeCount = NumberUtils.toInt(request.getParameter("codeCount"), 4);
  //		int lineCount = NumberUtils.toInt(request.getParameter("lineCount"), 10);
  //		if (width > 1000) width = 100;
  //		if (height > 300) height = 30;
  //		if (codeCount > 10) codeCount = 4;
  //		if (lineCount > 100) lineCount = 10;
  //		// 设置响应的类型格式为图片格式
  //		response.setContentType("image/jpeg");
  //		// 禁止图像缓存。
  //		response.setHeader("Pragma", "no-cache");
  //		response.setHeader("Cache-Control", "no-cache");
  //		response.setDateHeader("Expires", 0);
  //		// 自定义参数
  //		CaptchaUtil code = new CaptchaUtil(width, height, codeCount, lineCount);
  //		String sessionId = session.getId();
  //		RedisUtil.set("captcha_" + sessionId, code.getCode(), 60 * 30);
  //		code.write(response.getOutputStream());
  //	}
  
  }
  