本文是基于SpringBoot整合Kaptcha验证码实现

Kaptcha 是一个可高度配置的实用验证码生成工具，在项目开发中能够非常方便实现验证码

先来看一个由 Kaptcha 制作的验证码效果图

快速进入如何进行配置与实现的

第1步：配置 Kaptcha 的依赖库

        com.github.penggle            kaptcha            2.3.2

第2步：编写配置类

package com.dingsheng.configuration;import com.google.code.kaptcha.impl.DefaultKaptcha;import com.google.code.kaptcha.util.Config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import java.util.Properties;/** * 验证码 - Kaptcha - 插件 */@Configurationpublic class KaptchaConfig {    @Bean    public DefaultKaptcha getDefaultKaptcha() {        DefaultKaptcha captchaProducer = new DefaultKaptcha();        Properties properties = new Properties();        properties.setProperty("kaptcha.border", "yes");        properties.setProperty("kaptcha.border.color", "105,179,90");        properties.setProperty("kaptcha.textproducer.font.color", "blue");        properties.setProperty("kaptcha.image.width", "100");        properties.setProperty("kaptcha.image.height", "38");        properties.setProperty("kaptcha.textproducer.font.size", "30");        properties.setProperty("kaptcha.session.key", "code");        properties.setProperty("kaptcha.textproducer.char.length", "4");        properties.setProperty("kaptcha.textproducer.font.names", "宋体,楷体,微软雅黑");        Config config = new Config(properties);        captchaProducer.setConfig(config);        return captchaProducer;    }}

第3步：编写KaptchaController

package com.dingsheng.controller;import com.google.code.kaptcha.Constants;import com.google.code.kaptcha.Producer;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.awt.image.BufferedImage;import java.io.IOException;@Controllerpublic class KatchaController {    @Autowired    private Producer producer = null;    @GetMapping("/captcha")    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws IOException {        HttpSession session = request.getSession();        response.setDateHeader("Expires", 0);        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate"); // 浏览器和任何中继的Web代理，都不会存储这次相应的数据        response.addHeader("Cache-Control", "post-check=0, pre-check=0");        response.setHeader("Pragma", "no-cache");        response.setContentType("image/jpeg");        // 生成验证码        String capText = producer.createText();        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);        // 输出验证码        BufferedImage bi = producer.createImage(capText);        ServletOutputStream out = response.getOutputStream();        ImageIO.write(bi, "jpg", out);        out.flush();        out.close();    }}

第4步：页面引入验证码的请求地址

通过上面的4个步骤，即可以实现由 Kaptcha 制作的验证码