使用base64实现验证码功能-蒲公英云

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());
    }
}