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
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