springboot整合kaptcha生成验证码

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！