springboot整合kaptcha生成验证码功能

介绍：kaptcha 是谷歌开源的非常实用的验证码生成工具

一、导入jar包

<!-- kaptcha验证码 -->
<dependency>
<groupId>com.github.penggle</groupId>
<artifactId>kaptcha</artifactId>
<version>2.3.2</version>
</dependency>

二、编写kaptcha配置类

package com.zym.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 defaultKaptcha(){
   DefaultKaptcha kaptcha = new DefaultKaptcha();

Properties properties = new Properties();
   //边框
   properties.setProperty("kaptcha.border", "no");
   //字体颜色
   properties.setProperty("kaptcha.textproducer.font.color", "green");
   //图片宽度
   properties.setProperty("kaptcha.image.width", "120");
   //图片高度
   properties.setProperty("kaptcha.image.height", "30");
   //字体大小
   properties.setProperty("kaptcha.textproducer.font.size", "20");
   //session key
   properties.setProperty("kaptcha.session.key", "kaptcha");
   //验证码长度
   properties.setProperty("kaptcha.textproducer.char.length", "4");
   //字体
   properties.setProperty("kaptcha.textproducer.font.names", "宋体");
   //文字间隔
   properties.setProperty("kaptcha.textproducer.char.space", "10");
   //噪点实现类
   properties.setProperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");
   //图片样式-阴影
   properties.setProperty("kaptcha.obscurificator.impl", "com.google.code.kaptcha.impl.ShadowGimpy");

Config config = new Config(properties);
   kaptcha.setConfig(config);
   return kaptcha;
 }
}

三、编写接口

package com.zym.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

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;

@RestController
public class KaptchaController {

@Autowired
 private DefaultKaptcha defaultKaptcha;

@GetMapping("/kaptcha")
 public void getKaptcha(HttpServletRequest request, HttpServletResponse response) throws IOException {
   //设置响应头
   response.setHeader("Cache-Control", "no-cache");
   response.setHeader("Pragma", "no-cache");
   response.setContentType("image/jpeg");

String text = defaultKaptcha.createText();
   HttpSession session = request.getSession();
   //将验证码存入session
   session.setAttribute("code", text);
   //创建验证码图片
   BufferedImage image = defaultKaptcha.createImage(text);
   ServletOutputStream os = response.getOutputStream();
   ImageIO.write(image, "jpg", os);
   IOUtils.closeQuietly(os);
 }
}

四、测试接口

使用PostMan：
输入url：localhost:8080/kaptcha
成功得到验证码图片，大功告成！

来源：https://blog.csdn.net/qq_42804736/article/details/109200622