SpringBoot集成Kaptcha实现登录获取验证码

1、首先添加依赖

    <!--kaptcha验证码-->
        <dependency>
            <groupId>com.github.axet</groupId>
            <artifactId>kaptcha</artifactId>
            <version>0.0.9</version>
        </dependency>

2、编写Kaptcha的配置类

package com.louis.mango.config;

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;
@Configuration
public class KaptchaConfig {
    @Bean
    public DefaultKaptcha producer(){
        Properties  properties = new Properties();
        properties.put("kaptcha.border","no");
        properties.put("kaptcha.textproducer.font.color","black");
        properties.put("kaptcha.text.char.space","5");
        Config config = new Config(properties);
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }
}

测试类

package com.louis.mango.controller;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

@RestController
public class SysLoginController {
    @Autowired
    private Producer producer;
   @GetMapping("captcha.jpg")
    public void captcha(HttpServletResponse response, HttpServletRequest request) throws ServletException, IOException {
        response.setHeader("Cache-Controll","no-store,no-cache");
        response.setContentType("image/jpeg");
        //生成文字验证码
        String text = producer.createText();
        //生成图片验证码
        BufferedImage image =  producer.createImage(text);
       //保存验证码到session
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY,text);
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(image,"jpg",out);
        IOUtils.closeQuietly(out);
    }
}

测试结果