杨校老师课堂之编写验证码

矫情吗；* 2023-01-18 12:24 131阅读 0赞

## 前言 ##

#### 关于验证码 ####

1.  有时候我们需要客户在注册账号时，程序发出一个验证码到客户所输入的Email内，此时我们需要制作文本的**字符串验证码**
2.  当我们需要客户在登录时输入验证码时，此时的验证码为**图片验证码**

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/* * 1, 字符串类型的验证码 */
    public class VerificationCodeUtil{ 
    
    	/** * 验证码的来源 */
        final char [] code = { 
          '0','1','2','3','4','5','6','7','8','9',
          'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
          'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
        };
    
    
        /** * 字体 */
        final String [] fontNames = { 
               "黑体","宋体","微软雅黑"
        };
    
        /** * 字体样式 */
        final int [] fontStyles = { 
                Font.BOLD, Font.ITALIC
        };
    
        /** * 字体大小 */
        private  int  fontSize = 21;
    
        /** * 验证码的长度 */
        private  int  vcodeLen = 4;
    
        /** * 验证码图片的宽度 */
        private  int  width = (fontSize+1) * vcodeLen + 10;
    
        /** *验证码图片的高度 */
        private  int  height = fontSize+12;
    
    
        /** * 干扰线条数 */
        private  int disturbline = 4;;
    	
    	 /** * 生成验证码 * @return 字符串的验证码 */
        public  String  generatorVCode(){ 
            // 获取字母的字符数组长度
            int len = code.length;
    
            Random random = new Random();
    
            StringBuffer stringBuffer = new StringBuffer();
    
            for (int i = 0; i < vcodeLen; i++) { 
    
                int index = random.nextInt(len);
    
                stringBuffer.append(code[index]);
            }
    
            return stringBuffer.toString();
        }
    
        /** * 生成验证码图片 * @param vcode 验证码 * @param drawline 干扰线 * @return 验证码图片 */
        public  BufferedImage  generatorVCodeImage(String vcode, boolean drawline){ 
                // 创建验证码的图片
            BufferedImage  bufferedImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
            Graphics graphics = bufferedImage.getGraphics();
    
            graphics.fillRect(0,0,width,height);
            graphics.setColor(new Color(198, 189, 108));
    
            if (drawline){ 
                drawDisturbline(graphics);
            }
            Random random = new Random();
    
            for (int i = 0; i < vcode.length(); i++) { 
                // 设置字体
                graphics.setFont(new Font(fontNames[random.nextInt(fontNames.length)],fontStyles[random.nextInt(fontStyles.length)],fontSize));
                // 设置随机颜色
                graphics.setColor(getRandomColor());
    
                graphics.drawString(vcode.charAt(i)+"", i * fontSize  +10 , fontSize+5);
            }
            graphics.dispose();
    
            return bufferedImage;
        }
    
        /** * 获取随机颜色 * @return */
        private Color getRandomColor() { 
            Random random = new Random();
          return  new Color(  random.nextInt(220),random.nextInt(220),random.nextInt(220));
        }
    
        /** * 生成干扰线 * @param graphics 画笔 * @return 干扰线 */
        private Boolean drawDisturbline(Graphics graphics) { 
            Random random = new Random();
            for (int i = 0; i < disturbline; i++) { 
                int x1 = random.nextInt(width);
                int y1 = random.nextInt(height);
                int x2 = random.nextInt(width);
                int y2 = random.nextInt(height);
    
                // 设置随机颜色
                graphics.setColor(getRandomColor());
    
                // 画画干扰线
                graphics.drawLine(x1,y1,x2,y2);
            }
            return true;
        }
    
    }