本效果是利用easy-captcha工具包實現,首先需要加入相關依賴到pom.xml中,程式碼如下:
<dependency> <groupId>com.github.whvcse</groupId> <artifactId>easy-captcha</artifactId> <version>1.6.2</version> </dependency>
easy-captcha驗證碼工具支援GIF、中文、算術等類型,分別透過下面幾個實例物件實現:
SpecCaptcha(PNG類型的靜態圖片驗證碼)
GifCaptcha(Gif類型的圖片驗證碼)
#ChineseCaptcha(GIF型中文圖片驗證碼)
#ArithmeticCaptcha(算術類型的圖片驗證碼)
字元類型分為以下幾種:
TYPE_DEFAULT:數字和字母混合
TYPEONLYNUMBER:純數字
TYPEONLYCHAR:純字母
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()); } }
/kaptcha
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>验证码</title> </head> <body> <img src="/kaptcha" onclick="this.src='/kaptcha?t=new Date()'" alt="怎麼使用java搞定網站登入驗證碼" > </body> </html>存取後端驗證碼路徑/kaptcha,驗證碼為圖片形式。 onclick方法為點選該標籤時可動態切換顯示驗證碼。 啟動Spring Boot項目,開啟瀏覽器輸入位址:#http://localhost:8080/kaptcha.html效果如下: 驗證碼驗證後端程式碼
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"; } }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>验证码验证</title> </head> <body> <img src="/kaptcha" onclick="this.src='/kaptcha?d=new Date()'" alt="怎麼使用java搞定網站登入驗證碼" > <input type="text" maxlength="5" id="code" placeholder="请输入验证码"/> <button id="verify">验证</button> <p id="verifyResult"></p> </body> <script src="https://s3.pstatp.com/cdn/expire-1-M/jquery/3.3.1/jquery.min.js"></script> <script type="text/javascript" > $(function(){ //验证按钮点击事件 $('#verify').click(function(){ var code=$('#code').val(); $.ajax({ type:'GET',//方法类型 url:'/verify?code='+code, success:function(result){ $('#verifyResult').html(result); }, error:function(){ alert('请求失败'); }, }); }); }); </script> </html>
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