介紹：kaptcha 是谷歌開源的非常實用的驗證碼生成工具

一、匯入jar包

<!-- kaptcha驗證碼 -->
<dependency>
	<groupId>com.github.penggle</groupId>
	<artifactId>kaptcha</artifactId>
	<version>2.3.2</version>
</dependency>

二、編寫kaptcha配置類

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();
    //邊框
    properties.setProperty("kaptcha.border","no");
    //字型顏色
    properties.setProperty("kaptcha.textproducer.font.color","green");
    //圖片寬度
    properties.setProperty("kaptcha.image.width","120");
    //圖片高度
    properties.setProperty("kaptcha.image.height","30");
    //字型大小
    properties.setProperty("kaptcha.textproducer.font.size","20");
    //session key
    properties.setProperty("kaptcha.session.key","kaptcha");
    //驗證碼長度
    properties.setProperty("kaptcha.textproducer.char.length","4");
    //字型
    properties.setProperty("kaptcha.textproducer.font.names","宋體");
    //文字間隔
    properties.setProperty("kaptcha.textproducer.char.space","10");
    //噪點實現類
    properties.setProperty("kaptcha.noise.impl","com.google.code.kaptcha.impl.NoNoise");
    //圖片樣式-陰影
    properties.setProperty("kaptcha.obscurificator.impl","com.google.code.kaptcha.impl.ShadowGimpy");

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

三、編寫介面

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 {
    //設定響應頭
    response.setHeader("Cache-Control","no-cache");
    response.setHeader("Pragma","no-cache");
    response.setContentType("image/jpeg");

    String text = defaultKaptcha.createText();
    HttpSession session = request.getSession();
    //將驗證碼存入session
    session.setAttribute("code",text);
    //建立驗證碼圖片
    BufferedImage image = defaultKaptcha.createImage(text);
    ServletOutputStream os = response.getOutputStream();
    ImageIO.write(image,"jpg",os);
    IOUtils.closeQuietly(os);
  }
}

四、測試介面

使用PostMan：
輸入url：localhost:8080/kaptcha
成功得到驗證碼圖片，大功告成！

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