本效果是利用easy-captcha工具包实现,首先需要添加相关依赖到pom.xml中,代码如下:
com.github.whvcse easy-captcha 1.6.2
easy-captcha验证码工具支持GIF、中文、算术等类型,分别通过下面几个实例对象实现:
SpecCaptcha(PNG类型的静态图片验证码)
GifCaptcha(Gif类型的图片验证码)
ChineseCaptcha(GIF类型中文图片验证码)
ArithmeticCaptcha(算术类型的图片验证码)
字符类型分为以下几种:
TYPE_DEFAULT:数字和字母混合
TYPEONLYNUMBER:纯数字
TYPEONLYCHAR:纯字母
TYPEONLYUPPER:纯大写字母
TYPEONLYLOWER:纯小写字母
TYPENUMAND_UPPER:数字和大写字母混合
package com.yanx.controller; import com.wf.captcha.SpecCaptcha; import com.wf.captcha.base.Captcha; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.thymeleaf.util.StringUtils; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @Controller public class KapchaController { @GetMapping("/kaptcha") public void defaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws IOException { httpServletResponse.setHeader("Cache-Control","no-store"); httpServletResponse.setHeader("Pragma","no-cache"); httpServletResponse.setDateHeader("Expires",0); httpServletResponse.setContentType("image/gif"); //三个参数分别为宽、高、位数 SpecCaptcha captcha=new SpecCaptcha(75,30,4); //设置类型为数字和字母混合 captcha.setCharType(Captcha.TYPE_DEFAULT); //设置字体 captcha.setCharType(Captcha.FONT_9); //验证码存入session httpServletRequest.getSession().setAttribute("verifyCode",captcha.text().toLowerCase()); //输出图片流 captcha.out(httpServletResponse.getOutputStream()); } }
这里控制器新增了defaultKaptcha()方法,该方法所拦截处理的路径为/kaptcha
在static目录中新建kaptcha.html页面,代码如下:
访问后端验证码路径/kaptcha,验证码为图片形式。onclick方法为点击该标签时可以动态切换显示验证码。
启动Spring Boot项目,打开浏览器输入地址:
http://localhost:8080/kaptcha.html
效果如下:
package com.yanx.controller; import com.wf.captcha.SpecCaptcha; import com.wf.captcha.base.Captcha; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.thymeleaf.util.StringUtils; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; @Controller public class KapchaController { @GetMapping("/kaptcha") public void defaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws IOException { httpServletResponse.setHeader("Cache-Control","no-store"); httpServletResponse.setHeader("Pragma","no-cache"); httpServletResponse.setDateHeader("Expires",0); httpServletResponse.setContentType("image/gif"); //三个参数分别为宽、高、位数 SpecCaptcha captcha=new SpecCaptcha(75,30,4); //设置类型为数字和字母混合 captcha.setCharType(Captcha.TYPE_DEFAULT); //设置字体 captcha.setCharType(Captcha.FONT_9); //验证码存入session httpServletRequest.getSession().setAttribute("verifyCode",captcha.text().toLowerCase()); //输出图片流 captcha.out(httpServletResponse.getOutputStream()); } @GetMapping("/verify") @ResponseBody public String verify(@RequestParam("code") String code, HttpSession session){ if(StringUtils.isEmpty(code)){ return "验证码不能为空"; } String kapchaCode = session.getAttribute("verifyCode")+""; if(StringUtils.isEmpty(kapchaCode)||!code.toLowerCase().equals(kapchaCode)){ return "验证码输入错误"; } return "验证成功"; } }
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