Vue如何实现图片验证码生成

这篇文章主要介绍"Vue如何实现图片验证码生成"，在日常操作中，相信很多人在Vue如何实现图片验证码生成问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"Vue如何实现图片验证码生成"的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

一、前端图片验证码生成

前端逻辑大体就是进行图形绘制，取几个随机数放入图片中，加入干扰，进行验证

1.创建验证码组件identify.vue

2.父组件

前端生成验证码的校验是自己生成验证码，用户输入的值和生成的验证码字符串进行比对校验的，校验没有走后端，在真正发送请求到后端的时候也是不将验证码传给后台的。

二、后端生成图片验证码

后台思路很，利用BufferedImage类创建一张图片，再用Graphics对图片进行绘制(生成随机字符，添加噪点，干扰线)即可。

package com.hengtiansoft.gxrc.base.util; import com.hengtiansoft.gxrc.common.constant.MagicNumConstant;import lombok.extern.slf4j.Slf4j;import org.springframework.stereotype.Component; import javax.imageio.ImageIO;import java.awt.Font;import java.awt.Color;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.util.Base64;import java.util.HashMap;import java.util.Map;import java.util.Random; @Slf4j@Componentpublic class ImgCaptchaUtil {      private Random random = new Random();    /**     * 验证码的宽     */    private final int width = 160;    /**     * 验证码的高     */    private final int height = 40;    /**     * 验证码的干扰线数量     */    private final int lineSize = 30;    /**     * 验证码词典     */    private final String randomString = "0123456789abcdefghijklmnopqrstuvwxyz";     /**     * 获取字体     * @return     */    private Font getFont() {        return new Font("Times New Roman", Font.ROMAN_BASELINE, MagicNumConstant.FORTY);    }     /**     * 获取颜色     * @param fc     * @param bc     * @return     */    private Color getRandomColor(int fc, int bc) {         int fcc = Math.min(fc, MagicNumConstant.TWO_HUNDRED_FIFTY_FIVE);        int bcc = Math.min(bc, MagicNumConstant.TWO_HUNDRED_FIFTY_FIVE);         int r = fcc + random.nextInt(bcc - fcc - MagicNumConstant.SIXTEEN);        int g = fcc + random.nextInt(bcc - fcc - MagicNumConstant.FOURTEEN);        int b = fcc + random.nextInt(bcc - fcc - MagicNumConstant.TWELVE);         return new Color(r, g, b);    }     /**     * 绘制干扰线     * @param g     */    private void drawLine(Graphics g) {        int x = random.nextInt(width);        int y = random.nextInt(height);        int xl = random.nextInt(MagicNumConstant.TWENTY);        int yl = random.nextInt(MagicNumConstant.TEN);        g.drawLine(x, y, x + xl, y + yl);    }     /**     * 获取随机字符     * @param num     * @return     */    private String getRandomString(int num) {        int number = num > 0 ? num : randomString.length();        return String.valueOf(randomString.charAt(random.nextInt(number)));    }     /**     * 绘制字符串     * @param g     * @param randomStr     * @param i     * @return     */    private String drawString(Graphics g, String randomStr, int i) {        g.setFont(getFont());        g.setColor(getRandomColor(MagicNumConstant.ONE_HUNDRED_EIGHT, MagicNumConstant.ONE_HUNDRED_NINETY));        String rand = getRandomString(random.nextInt(randomString.length()));        String randomString = randomStr + rand;        g.translate(random.nextInt(MagicNumConstant.THREE), random.nextInt(MagicNumConstant.SIX));        g.drawString(rand, MagicNumConstant.FORTY * i + MagicNumConstant.TEN, MagicNumConstant.TWENTY_FIVE);        return randomString;    }     /**     * 生成随机图片，返回 base64 字符串     * @param     * @return     */    public Map getImgCodeBaseCode(int length) {        Map result = new HashMap<>();        // 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();        g.fillRect(0, 0, width, height);        // 获取颜色        g.setColor(getRandomColor(MagicNumConstant.ONE_HUNDRED_FIVE, MagicNumConstant.ONE_HUNDRED_EIGHTY_NINE));        // 获取字体        g.setFont(getFont());        // 绘制干扰线        for (int i = 0; i < lineSize; i++) {            drawLine(g);        }         // 绘制随机字符        String randomCode = "";        for (int i = 0; i < length; i++) {            randomCode = drawString(g, randomCode, i);        }        g.dispose();         result.put("imgCode", randomCode);         String base64Code = "";        try {            //返回 base64            ByteArrayOutputStream bos = new ByteArrayOutputStream();            ImageIO.write(image, "PNG", bos);             byte[] bytes = bos.toByteArray();            Base64.Encoder encoder = Base64.getEncoder();            base64Code = encoder.encodeToString(bytes);         } catch (Exception e) {            log.debug(e.getMessage());        }        result.put("data", _"data:image/png;base64," + base64Code);        return result;    } }

后台生成图片base64，和一个唯一的key（通过这个key判断是哪张图片），后台可以通过接口传给前端图片base64和key，前端输入验证码，传给后台key和验证码去校验验证。

package com.hengtiansoft.gxrc.base.service.impl; import com.hengtiansoft.gxrc.base.service.ImgCaptchaService;import com.hengtiansoft.gxrc.base.util.ImgCaptchaUtil;import com.hengtiansoft.gxrc.common.constant.MagicNumConstant;import com.hengtiansoft.gxrc.common.entity.exception.BusinessException;import com.hengtiansoft.gxrc.common.redis.RedisOperation;import com.hengtiansoft.gxrc.common.util.UUIDUtils;import org.apache.commons.lang3.ObjectUtils;import org.apache.commons.lang3.StringUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.stereotype.Service; import java.util.Map; /** * @Description: * @Author: wu * @CreateDate: 2020/11/11 17:17 */@Servicepublic class ImgCaptchaServiceImpl implements ImgCaptchaService {     private static final String IMG_CAPTCHA = "imgCaptcha:";     @Autowired    private RedisTemplate redisTemplate;     @Autowired    private ImgCaptchaUtil imgCaptchaUtil;     @Override    public Map getImgCaptcha() {        RedisOperation redisOperation = new RedisOperation(redisTemplate);        Map map = imgCaptchaUtil.getImgCodeBaseCode(MagicNumConstant.FOUR);        String uuid = UUIDUtils.createUUID();        redisOperation.set(IMG_CAPTCHA + uuid, map.get("imgCode"));        redisOperation.expire(IMG_CAPTCHA + uuid, MagicNumConstant.THIRTY_THOUSAND);        map.remove("imgCode");        map.put("key", uuid);        return map;    }     @Override    public void checkImgCaptcha(String code, String key) {        RedisOperation redisOperation = new RedisOperation(redisTemplate);        String captcha = redisOperation.get(IMG_CAPTCHA + key);        if (ObjectUtils.isEmpty(captcha) || !StringUtils.equals(captcha, code)) {            throw new BusinessException("验证码错误");        }        redisOperation.del(IMG_CAPTCHA + key);    }}

到此，关于"Vue如何实现图片验证码生成"的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注网站，小编会继续努力为大家带来更多实用的文章！