captcha驗證碼怎么輸入(SpringBoot如何使用Kaptcha實現驗證碼的生成與驗證功能)

當我們在項目中登錄使用驗證碼的時候,不妨試試Kaptcha生成驗證碼,非常簡單

1、首先,我們在pom.xml文件中引入kaptcha的maven依賴

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

2、然后,我們編寫kaptcha的配置類:KaptchaConfig.java

packagecom.lzzy.meet.common.kaptcha;importcom.google.code.kaptcha.impl.DefaultKaptcha;importcom.google.code.kaptcha.util.Config;importlombok.extern.slf4j.Slf4j;importorg.springframework.context.annotation.Bean;importorg.springframework.stereotype.Component;importjava.util.Properties;/***@ClassNameKaptchaConfig*kaptcha配置類*@Author*@Date2019-09-0513:50:50*@Version1.0**/@Slf4j@ComponentpublicclassKaptchaConfig{@BeanpublicDefaultKaptchagetKaptcheCode(){DefaultKaptchadefaultKaptcha=newDefaultKaptcha();Propertiesproperties=newProperties();properties.setProperty("kaptcha.border","no");properties.setProperty("kaptcha.textproducer.font.color","black");properties.setProperty("kaptcha.image.width","100");properties.setProperty("kaptcha.image.height","36");properties.setProperty("kaptcha.textproducer.font.size","30");properties.setProperty("kaptcha.obscurificator.impl","com.google.code.kaptcha.impl.ShadowGimpy");properties.setProperty("kaptcha.session.key","code");properties.setProperty("kaptcha.noise.impl","com.google.code.kaptcha.impl.NoNoise");properties.setProperty("kaptcha.background.clear.from","232,240,254");properties.setProperty("kaptcha.background.clear.to","232,240,254");properties.setProperty("kaptcha.textproducer.char.length","4");properties.setProperty("kaptcha.textproducer.font.names","彩云,宋體,楷體,微軟雅黑");Configconfig=newConfig(properties);defaultKaptcha.setConfig(config);returndefaultKaptcha;}}

3、接下來,我們編寫kaptcha的控制層:KaptchaController.java

packagecom.lzzy.meet.common.kaptcha;importcom.google.code.kaptcha.Constants;importcom.google.code.kaptcha.Producer;importlombok.extern.slf4j.Slf4j;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Controller;importorg.springframework.web.bind.annotation.GetMapping;importorg.springframework.web.bind.annotation.RequestMapping;importjavax.imageio.ImageIO;importjavax.servlet.ServletOutputStream;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjava.awt.image.BufferedImage;/***@ClassNameKaptchaController*kaptcha調用*@Author*@Date2019-09-0513:59:59*@Version1.0**/@Slf4j@Controller@RequestMapping("kaptcha")publicclassKaptchaController{@AutowiredprivateProducerproducer;@GetMapping("kaptcha-image")publicvoidgetKaptchaImage(HttpServletRequestrequest,HttpServletResponseresponse)throwsException{response.setDateHeader("Expires",0);response.setHeader("Cache-Control","no-store,no-cache,must-revalidate");response.addheader("Cache-Control","post-check=0,pre-check=0");response.setHeader("Pragma","no-cache");response.setContentType("image/jpeg");StringcapText=producer.createText();log.info("******************當前驗證碼為:{}******************",capText);//將驗證碼存于session中request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY,capText);BufferedImagebi=producer.createImage(capText);ServletOutputStreamout=response.getOutputStream();//向頁面輸出驗證碼ImageIO.write(bi,"jpg",out);try{//清空緩存區out.flush();}finally{//關閉輸出流out.close();}}}

4、然后,我們就可以在前端調用katpcha的接口生成驗證碼了:

<imgth:src="@{/kaptcha/kaptcha-image}"class="ver_btn"onclick="this.src=this.src+'?c='+Math.random();"/>

由于我這里使用的是 thymeleaf 模板引擎,所以路徑名稱會有點奇怪,生成的驗證碼樣式如圖所示:

5、最后,我們將用戶在客戶端登陸時輸入的驗證碼傳送到服務端進行驗證:

/***驗證驗證碼*@param*@return正確:true/錯誤:false*/publicstaticbooleanvalidate(StringregisterCode){//獲取Session中驗證碼Objectcaptcha=ServletUtils.getAttribute(Constants.KAPTCHA_SESSION_KEY);//判斷驗證碼是否為空if(StringUtils.isempty(registerCode)){returnfalse;}//校驗驗證碼的正確與否booleanresult=registerCode.equalsIgnoreCase(captcha.toString());if(result){//正確了后,將驗證碼從session中刪掉ServletUtils.getRequest().getSession().removeAttribute(Constants.KAPTCHA_SESSION_KEY);}//返回驗證結果returnresult;}

到此,相信大家對“SpringBoot如何使用Kaptcha實現驗證碼的生成與驗證功能”有了更深的了解,不妨來實際操作一番吧!這里是本站網站,更多相關內容可以進入相關頻道進行查詢,關注我們,繼續學習!