验证码-Jcaptcha的使用
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pom.xml引入依赖
<dependency> <groupId>com.octo.captcha</groupId> <artifactId>jcaptcha-all</artifactId> <version>1.0-RC6</version> <exclusions> <exclusion> <groupId>quartz</groupId> <artifactId>quartz</artifactId> </exclusion> <exclusion> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> </exclusion> <exclusion> <groupId>commons-pool</groupId> <artifactId>commons-pool</artifactId> </exclusion> <exclusion> <groupId>hsqldb</groupId> <artifactId>hsqldb</artifactId> </exclusion> <exclusion> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache</artifactId> </exclusion> <exclusion> <groupId>concurrent</groupId> <artifactId>concurrent</artifactId> </exclusion> <exclusion> <groupId>org.springframework</groupId> <artifactId>spring</artifactId> </exclusion> <exclusion> <groupId>xerces</groupId> <artifactId>xercesImpl</artifactId> </exclusion> <exclusion> <groupId>xerces</groupId> <artifactId>xmlParserAPIs</artifactId> </exclusion> </exclusions> </dependency>
定义验证码使用的服务类(这里使用单例定义该服务类):
package com.trustel.common; import java.awt.Color; import java.awt.Font; import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator; import com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator; import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator; import com.octo.captcha.component.image.textpaster.RandomTextPaster; import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage; import com.octo.captcha.component.word.FileDictionary; import com.octo.captcha.component.word.wordgenerator.ComposeDictionaryWordGenerator; import com.octo.captcha.engine.GenericCaptchaEngine; import com.octo.captcha.image.gimpy.GimpyFactory; import com.octo.captcha.service.multitype.GenericManageableCaptchaService; public class CaptchaUtil{ private static GenericManageableCaptchaService imageCaptchaService = null; public static GenericManageableCaptchaService getInstance(){ if(imageCaptchaService == null){ imageCaptchaService = generateImageCaptchaService(); } return imageCaptchaService; } public static GenericManageableCaptchaService generateImageCaptchaService(){ Integer WIDTH = 60;//验证码宽 Integer HEIGHT = 25;//验证码高 Integer MINLENGTH = 4;//字符最短 Integer MAXLENGTH = 4;//字符最长 Integer MINFONTSIZE = 10;//字符最小 Integer MAXFONTSIZE = 15;//字符最大 Integer LIVETIME = 5*60;//验证码存活时间 Integer MAXCAPTCHASTORESIZE = 200000;//最大存储大小 //随机颜色 // RandomRangeColorGenerator textColor = new RandomRangeColorGenerator(new int[]{0,0},new int[]{0,0},new int[]{0,0},new int[]{255,255}); //验证码字符 // RandomTextPaster randomTextPaster = new RandomTextPaster(MINLENGTH, MAXLENGTH, textColor,true); RandomTextPaster randomTextPaster = new RandomTextPaster(MINLENGTH, MAXLENGTH, Color.gray); //背景(渐变色) // BackgroundGenerator colorbgGen = new GradientBackgroundGenerator(WIDTH, HEIGHT,new Color(46,195,231),Color.WHITE); //背景大小及样式设置,UniColorBackgroundGenerator类生成的是统一背景,这里背景统一是lightGray颜色 //宽度为180,高度为50。 BackgroundGenerator colorbgGen = new UniColorBackgroundGenerator(WIDTH, HEIGHT); /* //FunkyBackgroundGenerator类生成的是炫酷背景 BackgroundGenerator back = new FunkyBackgroundGenerator(new Integer( 180), new Integer(50));*/ //随机生成的字体大小和字体类型 RandomFontGenerator randomFontGenerator = new RandomFontGenerator(MINFONTSIZE, MAXFONTSIZE, new Font[]{new Font("Arial", 0, 10),new Font("Tahoma",0,10)}); //生成图片对象 ComposedWordToImage cwti = new ComposedWordToImage(randomFontGenerator,colorbgGen,randomTextPaster); //随机文本的字典 ComposeDictionaryWordGenerator cdwg = new ComposeDictionaryWordGenerator(new FileDictionary("toddlist")); GimpyFactory gf = new GimpyFactory(cdwg, cwti); GenericCaptchaEngine gce = new GenericCaptchaEngine(new GimpyFactory[]{gf}); //返回一个对象, return new GenericManageableCaptchaService(gce, LIVETIME, MAXCAPTCHASTORESIZE); } public static Boolean validateCaptcha(String id,String captcha){ boolean isValid = false; isValid = getInstance().validateResponseForID(id, captcha).booleanValue(); return isValid; } }
产生验证码:
如果是spring的话,在controller中定义产生验证码的方法:
@GetMapping("/captcha") public void getCaptcha(HttpServletRequest request,HttpServletResponse response){ response.setHeader("Cache-Control", "no-store"); response.setHeader("Pragma", "no-cache"); response.setDateHeader("Expires", 0); response.setContentType("image/jpeg"); BufferedImage bi = CaptchaUtil.getInstance().getImageChallengeForID(request.getSession(true).getId()); try { ServletOutputStream out = response.getOutputStream(); ImageIO.write(bi, "jpg", out); try{ out.flush(); }finally{ out.close(); } } catch (IOException e) { e.printStackTrace(); } }
在前端页面定义验证码产生的位置
... <input id="yzm" type="text" maxlength="4" name="captcha" placeholder="验证码"> <img id="captcha" class="code-pic" style="cursor: pointer;" alt="验证码" src="<%=basePath %>/sys/captcha"> ... <script type="text/javascript"> $("#captcha").bind(‘click‘,function(){ $("#captcha").prop("src",‘<%=basePath %>/sys/captcha‘); }) </script>
检验验证码:
... String captchaValue= request.getParameter("captcha");//request获得验证码 Boolean isValid=CaptchaUtil.validateCaptcha(request.getSession(true).getId(), captchaValue);//CaptchaUtil的validCaptcha方法检验验证码的正误 if(isValid){ //doSomeThing,执行验证码通过的操作 }else{ return "/login";//返回登录页面 }
...
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