使用base64實現驗證碼功能

本代碼摘自網絡，因時間久了忘記位置，無法表明出處，侵刪。

1.驗證碼類

import java.io.Serializable;

/**
 * 
 * @ClassName: Validate
 * @Description: 驗證碼類
 * @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;           //驗證碼值
    
    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生成工具類

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;                  //驗證碼類，用於最後返回此對象，包含驗證碼圖片base64和真值
       private static Random random = new Random();              //隨機類，用於生成隨機參數
       private static String randString = "0123456789abcdefghijkmnpqrtyABCDEFGHIJLMNQRTY";//隨機生成字符串的取值範圍  
         
       private static int width = 80;     //圖片寬度  
       private static int height = 34;    //圖片高度  
       private static int StringNum = 4;  //字符的數量  
       private static int lineSize = 40;  //干擾線數量  
         
    
       //將構造函數私有化 禁止new創建
       private ValidateCodeUtil() {
           super();
       }
    
       /** 
        * 獲取隨機字符,並返回字符的String格式 
        * @param index (指定位置) 
        * @return 
        */  
       private static String getRandomChar(int index) {  
           //獲取指定位置index的字符，並轉換成字符串表示形式  
           return String.valueOf(randString.charAt(index));  
       }  
       /**
        * 獲取隨機指定區間的隨機數 
        * @param min (指定最小數) 
        * @param max (指定最大數) 
        * @return 
        */
       private static int getRandomNum(int min,int max) { 
           return RandomUtils.nextInt(min);
//           return RandomUtils.nextInt(min, max);
       }  
         
       /** 
        * 獲得字體 
        * @return 
        */  
       private static Font getFont() {  
           return new Font("Fixedsys", Font.CENTER_BASELINE, 25);  //名稱、樣式、磅值  
       }  
         
       /** 
        * 獲得顏色 
        * @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);  
       }  
         
       /** 
        * 繪製字符串,返回繪製的字符串 
        * @param g 
        * @param randomString 
        * @param i 
        * @return 
        */  
       private static String drawString(Graphics g, String randomString, int i) { 
           Graphics2D g2d = (Graphics2D) g;
           g2d.setFont(getFont());   //設置字體  
           g2d.setColor(new Color(random.nextFloat(), random.nextFloat(), random.nextFloat()));//設置顏色  
           String randChar = String.valueOf(getRandomChar(random.nextInt(randString.length())));  
           randomString += randChar;   //組裝  
           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;  
       }  
         
       /** 
        * 繪製干擾線 
        * @param g 
        */  
       private static void drawLine(Graphics g) {  
           //起點(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圖片驗證碼
        * @param key
        * @return String 返回base64
        */
       public static Validate getRandomCode() {  
           validate = validate==null?new Validate():validate;
           
           // BufferedImage類是具有緩衝區的Image類,Image類是用於描述圖像信息的類  
           BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);  
           Graphics g = image.getGraphics();// 獲得BufferedImage對象的Graphics對象  
           g.fillRect(0, 0, width, height);//填充矩形  
           g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//設置字體  
           g.setColor(getRandColor(110, 133));//設置顏色  
           //繪製干擾線  
           for(int i = 0; i <= lineSize; i++) {  
               drawLine(g);  
           }  
           //繪製字符  
           String randomString = "";  
           for(int i = 1; i <= StringNum; i++) {  
               randomString = drawString(g, randomString, i); 
               validate.setValue(randomString);
           }  
             
           g.dispose();//釋放繪圖資源  
           ByteArrayOutputStream bs = null;
           try {  
               bs = new ByteArrayOutputStream();
               ImageIO.write(image, "png", bs);//將繪製得圖片輸出到流  
               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. 測試調用

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