生成图形验证码

Posted 2022-07-17 hhr-sun

package com.cinc.ecmpusercenter.utils;

import com.cinc.ecmpusercenter.exception.BasException;
import com.thoughtworks.xstream.core.util.Base64Encoder;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Random;

/**
 * @Author: hhr
 * @Despriction:  图片验证码生成
 * @CreatedTime: 2019/7/30 8:58
 * @ModifyBy:
 * @ModifyTime:
 * @ModifyDespriction:
 * @Version: V1.0.0
 */
@SuppressWarnings("AlibabaCommentsMustBeJavadocFormat")
public class Captcha 

    // 图片的宽度
    private int width = 120;
    // 图片的高度
    private int height = 40;
    // 验证码字符个数
    private int codeCount = 4;
    // 验证码干扰线数
    private int lineCount = 50;
    // 验证码
    private String code = null;
    // 验证码图片Buffer
    private BufferedImage buffImg = null;

    private char[] codeSequence =  ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘M‘, ‘N‘, ‘P‘, ‘Q‘, ‘R‘,
            ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘ ;

    // 生成随机数
    private Random random = new Random();

    public Captcha() 
        this.createCode();
    

    /**
     * 生成图片
     * @param width 图片宽
     * @param height 图片高
     */
    public Captcha(int width, int height) 
        this.width = width;
        this.height = height;
        this.createCode();
    

    /**
     * 生成图片
     * @param width 图片宽
     * @param height 图片高
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     */
    public Captcha(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() 
        // 字体的高度
        int codeX = 0;
        // 每个字符的宽度
        int fontHeight = 0;

        fontHeight = height - 5;
        codeX = width / (codeCount + 3);

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();

        //将图像填充为白色,设置随机背景色
        g.setColor(this.getRandomColor(0, 50));
        g.fillRect(0, 0, width, height);

        //随机生成干扰线
        g.setColor(this.getRandomColor(50, 100));
        for (int i = 0; i < lineCount; i++)
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(width);
            int yl = random.nextInt(height);

            g.drawLine(x,y,xl,yl);
        

        // 创建字体
        ImgFontByte imgFont = new ImgFontByte();
        Font font = imgFont.getFont(fontHeight);
        g.setFont(font);

        StringBuffer randomCode = new StringBuffer();
        // 随机产生验证码字符
        for (int i = 0; i < codeCount; i++) 
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
            // 设置字体颜色
            g.setColor(getRandomColor(100,250));
            // 设置字体位置
            g.drawString(strRand, (i + 1) * codeX, getRandomNumber(height / 2) + 25);

            randomCode.append(strRand);
        
        code = randomCode.toString();
    

    /** 获取随机颜色 */
    private Color getRandomColor(int bc,int fc) 

        if (bc > 255)
            bc = 255;
        
        if (fc > 255)
            fc = 255;
        

        int r = getRandomNumber(fc - bc);
        int g = getRandomNumber(fc - bc);
        int b = getRandomNumber(fc - bc);

        return new Color(r, g, b);
    

    /** 获取随机数 */
    private int getRandomNumber(int number) 

        return random.nextInt(number);
    

    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 this.buffImg;
    

    public String getCode() 
        return this.code;
    

    /** 字体样式类 */
    class ImgFontByte 
        public Font getFont(int fontHeight) 
            try 
                Font baseFont = Font.createFont(Font.HANGING_BASELINE, new ByteArrayInputStream(
                        hex2byte(getFontByteStr())));
                return baseFont.deriveFont(Font.PLAIN, fontHeight);
             catch (Exception e) 
                return new Font("Arial", Font.PLAIN, fontHeight);
            
        

        private byte[] hex2byte(String str) 
            if (str == null)
                return null;
            

            str = str.trim();
            int len = str.length();
            if (len == 0 || len % 2 == 1)
                return null;
            

            byte[] b = new byte[len / 2];
            try 
                for (int i = 0; i < str.length(); i += 2) 
                    b[i / 2] = (byte) Integer.decode("0x" + str.substring(i, i + 2)).intValue();
                
                return b;
             catch (Exception e) 
                return null;
            
        

        // 字体文件的十六进制字符串
        private String getFontByteStr() 
            //防止报字符串长度过长错误，改为从配置文件读取
            //return ReadFontByteProperties.getFontByteStr();

            return "宋体";
        
    

    /**
     * 验证
     * @param localCode  后台保存的验证码
     * @param upLoadCode 前台上送的验证码
     * @return
     */
    public boolean validateCode(String localCode,String upLoadCode)

        if (EmptyUtils.isStringEmpty(localCode) || EmptyUtils.isStringEmpty(upLoadCode))
            throw new BasException("ERROR","验证码过期，请重试");
        

        boolean flag = false;

        upLoadCode = upLoadCode.toUpperCase();

        if (localCode.equals(upLoadCode))
            flag =  true;
        
        return  flag;
    
    /**
     * 对BufferedImage进行base64转码
     * @return
     * @throws IOException
     */
    public String getEncodeBase64() throws IOException

        Base64Encoder encoder = new Base64Encoder();

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        ImageIO.write(buffImg, "png", outputStream);

        byte[] bytes = outputStream.toByteArray();

        String imageEncode = encoder.encode(bytes);

        return  imageEncode;