content: package com.clothrent.common;
  
  import javax.imageio.ImageIO;
  import java.awt.*;
  import java.awt.image.BufferedImage;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.Random;
  
  /**
   * 验证码生成器
   */
  public class ValidateCode {
  
      // 图片的宽度。
      private int width = 160;
      // 图片的高度。
      private int height = 60;
      // 验证码字符个数
      private int codeCount = 4;
      // 验证码干扰线数
      private int lineCount = 100;
      // 验证码
      public static String code = null;
      // 验证码图片Buffer
      private BufferedImage buffImg = null;
  
      private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};
  
      public ValidateCode() {
          this.createCode();
      }
  
      /**
       * @param width  图片宽
       * @param height 图片高
       */
      public ValidateCode(int width, int height) {
          this.width = width;
          this.height = height;
          this.createCode();
      }
  
      /**
       * @param width     图片宽
       * @param height    图片高
       * @param codeCount 字符个数
       * @param lineCount 干扰线条数
       */
      public ValidateCode(int width, int height, int codeCount, int lineCount) {
          this.width = width;
          this.height = height;
          this.codeCount = codeCount;
          this.lineCount = lineCount;
          this.createCode();
      }
  
      public void createCode() {
          int x = 0, fontHeight = 0, codeY = 0;
          int red = 0, green = 0, blue = 0;
  
          x = width / (codeCount + 2);//每个字符的宽度
          fontHeight = height - 2;//字体的高度
          codeY = height - 4;
  
          // 图像buffer
          buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
          Graphics2D g = buffImg.createGraphics();
          // 生成随机数
          Random random = new Random();
          // 将图像填充为白色
          g.setColor(Color.WHITE);
          g.fillRect(0, 0, width, height);
          // 创建字体
          ImgFontByte imgFont = new ImgFontByte();
          Font font = imgFont.getFont(fontHeight);
          g.setFont(font);
  
          for (int i = 0; i < lineCount; i++) {
              int xs = random.nextInt(width);
              int ys = random.nextInt(height);
              int xe = xs + random.nextInt(width / 8);
              int ye = ys + random.nextInt(height / 8);
              red = random.nextInt(255);
              green = random.nextInt(255);
              blue = random.nextInt(255);
              g.setColor(new Color(red, green, blue));
              g.drawLine(xs, ys, xe, ye);
          }
  
          // randomCode记录随机产生的验证码
          StringBuffer randomCode = new StringBuffer();
          // 随机产生codeCount个字符的验证码。
          for (int i = 0; i < codeCount; i++) {
              String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
              // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
              red = random.nextInt(255);
              green = random.nextInt(255);
              blue = random.nextInt(255);
              g.setColor(new Color(red, green, blue));
              g.drawString(strRand, (i + 1) * x, codeY);
              // 将产生的四个随机数组合在一起。
              randomCode.append(strRand);
          }
          // 将四位数字的验证码保存到Session中。
          code = randomCode.toString();
      }
  
      public void write(String path) throws IOException {
          OutputStream sos = new FileOutputStream(path);
          this.write(sos);
      }
  
      public void write(OutputStream sos) throws IOException {
          ImageIO.write(buffImg, "png", sos);
          sos.close();
      }
  
      public BufferedImage getBuffImg() {
          return buffImg;
      }
  
      public  String getCode() {
          return code;
      }
  
  }