Spring boot如何集成kaptcha并生成验证码

kaptcha是一个开源的验证码实现库

1.添加依赖

<dependency>
 <groupId>com.github.axet</groupId>
 <artifactId>kaptcha</artifactId>
 <version>0.0.9</version>
</dependency>

2.添加配置类

配置验证码的生成属性

package com.dream.road.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();
   // 设置边框
   properties.put("kaptcha.border", "yes");
   // 设置边框颜色
   properties.put("kaptcha.border.color", "105,179,90");
   // 设置字体颜色
   properties.put("kaptcha.textproducer.font.color", "black");
   // 设置图片宽度
   properties.put("kaptcha.image.width", "160");
   // 设置图片高度
   properties.put("kaptcha.image.height", "50");
   //设置字体尺寸
   properties.put("kaptcha.textproducer.font.size", "30");
   // 设置验证码长度
   properties.put("kaptcha.textproducer.char.length", "5");
   // 设置字体
   properties.put("kaptcha.textproducer.font.names", "宋体,楷体,黑体");

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

复制代码

参数：

• kaptcha.border：图片边框，值：yes , no

• kaptcha.border.color：边框颜色，值： r,g,b (and optional alpha) 或者 white,black,blue

• kaptcha.image.width：图片宽

• kaptcha.image.height：图片高

• kaptcha.textproducer.char.length：验证码长度

• kaptcha.textproducer.font.names：字体

• kaptcha.textproducer.font.size：字体大小

• kaptcha.textproducer.font.color：字体颜色

• kaptcha.textproducer.char.space：文字间隔

• kaptcha.background.clear.from：背景颜色渐变，开始颜色

• kaptcha.background.clear.to：背景颜色渐变，结束颜色

3.生成验证码api

package com.dream.road.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.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 LoginController {

@Autowired
 private Producer producer;

@GetMapping("captcha.jpg")
 public void captcha(HttpServletResponse response, HttpServletRequest request) throws ServletException, IOException {
   response.setHeader("Cache-Control", "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);
   // 保存到验证码到 session
   request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, text);

ServletOutputStream out = response.getOutputStream();
   ImageIO.write(image, "jpg", out);
   IOUtils.closeQuietly(out);
 }

}

4.测试

来源：https://www.cnblogs.com/baby123/p/13332064.html