使用base64实现验证码功能

野性酷女 2024-04-17 05:33 33阅读 0赞

> 本代码摘自网络，因时间久了忘记位置，无法表明出处，侵删。

### 1.验证码类 ###

import java.io.Serializable;
    
    /** * * @ClassName: Validate * @Description: 验证码类 * @author chenhx * @date 2017年11月14日 上午11:35:34 */
    public class Validate implements Serializable{ 
        
        private static final long serialVersionUID = 1L;
        private String Base64Str;       //Base64 值
        private String value;           //验证码值
        
        public String getBase64Str() { 
            return Base64Str;
        }
        public void setBase64Str(String base64Str) { 
            Base64Str = base64Str;
        }
        public String getValue() { 
            return value;
        }
        public void setValue(String value) { 
            this.value = value;
        }
    }

### 2.base64生成工具类 ###

import java.awt.Color;
    import java.awt.Font;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.image.BufferedImage;
    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.util.Random;
    
    import javax.imageio.ImageIO;
    
    import org.apache.commons.lang.math.RandomUtils;
    
    import com.alibaba.druid.util.Base64;
    
    public class ValidateCodeUtil { 
    
           private static Validate validate = null;                  //验证码类，用于最后返回此对象，包含验证码图片base64和真值
           private static Random random = new Random();              //随机类，用于生成随机参数
           private static String randString = "0123456789abcdefghijkmnpqrtyABCDEFGHIJLMNQRTY";//随机生成字符串的取值范围 
             
           private static int width = 80;     //图片宽度 
           private static int height = 34;    //图片高度 
           private static int StringNum = 4;  //字符的数量 
           private static int lineSize = 40;  //干扰线数量 
             
        
           //将构造函数私有化 禁止new创建
           private ValidateCodeUtil() { 
               super();
           }
        
           /** * 获取随机字符,并返回字符的String格式 * @param index (指定位置) * @return */  
           private static String getRandomChar(int index) {   
               //获取指定位置index的字符，并转换成字符串表示形式 
               return String.valueOf(randString.charAt(index));  
           }  
           /** * 获取随机指定区间的随机数 * @param min (指定最小数) * @param max (指定最大数) * @return */
           private static int getRandomNum(int min,int max) {  
               return RandomUtils.nextInt(min);
    // return RandomUtils.nextInt(min, max);
           }  
             
           /** * 获得字体 * @return */  
           private static Font getFont() {   
               return new Font("Fixedsys", Font.CENTER_BASELINE, 25);  //名称、样式、磅值 
           }  
             
           /** * 获得颜色 * @param fc * @param bc * @return */  
           private static Color getRandColor(int frontColor, int backColor) {   
               if(frontColor > 255)  
                   frontColor = 255;  
               if(backColor > 255)  
                   backColor = 255;  
                 
               int red = frontColor + random.nextInt(backColor - frontColor - 16);  
               int green = frontColor + random.nextInt(backColor - frontColor -14);  
               int blue = frontColor + random.nextInt(backColor - frontColor -18);  
               return new Color(red, green, blue);  
           }  
             
           /** * 绘制字符串,返回绘制的字符串 * @param g * @param randomString * @param i * @return */  
           private static String drawString(Graphics g, String randomString, int i) {  
               Graphics2D g2d = (Graphics2D) g;
               g2d.setFont(getFont());   //设置字体 
               g2d.setColor(new Color(random.nextFloat(), random.nextFloat(), random.nextFloat()));//设置颜色 
               String randChar = String.valueOf(getRandomChar(random.nextInt(randString.length())));  
               randomString += randChar;   //组装 
               int rot = getRandomNum(5,10);
               g2d.translate(random.nextInt(3), random.nextInt(3)); 
               g2d.rotate(rot * Math.PI / 180);
               g2d.drawString(randChar, 13*i, 20);   
               g2d.rotate(-rot * Math.PI / 180);
               return randomString;  
           }  
             
           /** * 绘制干扰线 * @param g */  
           private static void drawLine(Graphics g) {   
               //起点(x,y) 偏移量x1、y1 
               int x = random.nextInt(width);  
               int y = random.nextInt(height);  
               int xl = random.nextInt(13);  
               int yl = random.nextInt(15);  
               g.setColor(new Color(random.nextFloat(), random.nextFloat(), random.nextFloat()));
               g.drawLine(x, y, x + xl, y + yl);  
           }
           
           /** * * @MethodName: getRandomCode * @Description: 生成Base64图片验证码 * @param key * @return String 返回base64 */
           public static Validate getRandomCode() {   
               validate = validate==null?new Validate():validate;
               
               // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类 
               BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);  
               Graphics g = image.getGraphics();// 获得BufferedImage对象的Graphics对象 
               g.fillRect(0, 0, width, height);//填充矩形 
               g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//设置字体 
               g.setColor(getRandColor(110, 133));//设置颜色 
               //绘制干扰线 
               for(int i = 0; i <= lineSize; i++) {   
                   drawLine(g);  
               }  
               //绘制字符 
               String randomString = "";  
               for(int i = 1; i <= StringNum; i++) {   
                   randomString = drawString(g, randomString, i); 
                   validate.setValue(randomString);
               }  
                 
               g.dispose();//释放绘图资源 
               ByteArrayOutputStream bs = null;
               try {   
                   bs = new ByteArrayOutputStream();
                   ImageIO.write(image, "png", bs);//将绘制得图片输出到流 
                   String imgsrc = Base64.byteArrayToBase64(bs.toByteArray());
                   validate.setBase64Str(imgsrc);
               } catch (Exception e) {   
                   e.printStackTrace();  
               } finally {   
                   try { 
                       bs.close();
                   } catch (IOException e) { 
                       e.printStackTrace();
                   }finally{ 
                       bs = null;
                   }
               }     
               return validate;
           }  
           
    }

### 3. 测试调用 ###

public class Test { 
        public static void main(String[] args) { 
            Validate v = ValidateCodeUtil.getRandomCode();
            System.out.println(v.getBase64Str());
            System.out.println(v.getValue());
        }
    }