本文将使用Jcaptcha实现校验码验证,并演示在Spring/SpringMVC环境下的使用方法。
1. maven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>
注:请按需对需要排除的依赖进行增减
2. 需要将Jcaptcha的Bean加入Spring管理,故新增Spring-Jcaptcha的配置文件。web.xml中
<context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath*:applicationContext.xml classpath*:applicationContext-captcha.xml </param-value> </context-param>
3. applicationContext-captcha.xml的内容
<?xml version="1.0" encoding="UTF-8" ?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd" default-lazy-init="true"> <bean id="captchaService" class="com.octo.captcha.service.multitype.GenericManageableCaptchaService"> <constructor-arg index="0" ref="imageEngine" /> <constructor-arg type="int" index="1" value="180" /> <constructor-arg type="int" index="2" value="100000" /> </bean> <bean id="imageEngine" class="com.octo.captcha.engine.GenericCaptchaEngine"> <constructor-arg index="0"> <list> <ref bean="captchaFactory" /> </list> </constructor-arg> </bean> <bean id="captchaFactory" class="com.octo.captcha.image.gimpy.GimpyFactory"> <constructor-arg> <ref bean="wordgen" /> </constructor-arg> <constructor-arg> <ref bean="wordtoimage" /> </constructor-arg> </bean> <bean id="wordgen" class="com.octo.captcha.component.word.wordgenerator.RandomWordGenerator"> <!--可选字符--> <constructor-arg> <value> 0123456789abcdefghijklmnopqrstuvwxyz </value> </constructor-arg> </bean> <bean id="wordtoimage" class="com.octo.captcha.component.image.wordtoimage.ComposedWordToImage"> <constructor-arg index="0"> <ref bean="fontGenRandom" /> </constructor-arg> <constructor-arg index="1"> <ref bean="backGenUni" /> </constructor-arg> <constructor-arg index="2"> <ref bean="decoratedPaster" /> </constructor-arg> </bean> <bean id="fontGenRandom" class="com.octo.captcha.component.image.fontgenerator.RandomFontGenerator"> <!--最小字体--> <constructor-arg index="0"> <value>20</value> </constructor-arg> <!--最大字体--> <constructor-arg index="1"> <value>20</value> </constructor-arg> <constructor-arg index="2"> <list> <bean class="java.awt.Font"> <constructor-arg index="0"> <value>Arial</value> </constructor-arg> <constructor-arg index="1"> <value>0</value> </constructor-arg> <constructor-arg index="2"> <value>20</value> </constructor-arg> </bean> </list> </constructor-arg> </bean> <bean id="backGenUni" class="com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator"> <!--背景宽度--> <constructor-arg index="0"> <value>80</value> </constructor-arg> <!--背景高度--> <constructor-arg index="1"> <value>32</value> </constructor-arg> </bean> <bean id="decoratedPaster" class="com.octo.captcha.component.image.textpaster.DecoratedRandomTextPaster"> <!--最大字符长度--> <constructor-arg type="java.lang.Integer" index="0"> <value>4</value> </constructor-arg> <!--最小字符长度--> <constructor-arg type="java.lang.Integer" index="1"> <value>4</value> </constructor-arg> <!--文本颜色--> <constructor-arg index="2"> <ref bean="colorGen" /> </constructor-arg> <!--文本混淆--> <constructor-arg index="3"> <list> <!--<ref bean="baffleDecorator"/>--> </list> </constructor-arg> </bean> <bean id="baffleDecorator" class="com.octo.captcha.component.image.textpaster.textdecorator.BaffleTextDecorator"> <constructor-arg type="java.lang.Integer" index="0"> <value>1</value> </constructor-arg> <constructor-arg type="java.awt.Color" index="1"> <ref bean="colorWrite" /> </constructor-arg> </bean> <bean id="colorGen" class="com.octo.captcha.component.image.color.SingleColorGenerator"> <constructor-arg type="java.awt.Color" index="0"> <ref bean="colorDimGrey" /> </constructor-arg> </bean> <bean id="colorWrite" class="java.awt.Color"> <constructor-arg type="int" index="0"> <value>255</value> </constructor-arg> <constructor-arg type="int" index="1"> <value>255</value> </constructor-arg> <constructor-arg type="int" index="2"> <value>255</value> </constructor-arg> </bean> <bean id="colorDimGrey" class="java.awt.Color"> <constructor-arg type="int" index="0"> <value>105</value> </constructor-arg> <constructor-arg type="int" index="1"> <value>105</value> </constructor-arg> <constructor-arg type="int" index="2"> <value>105</value> </constructor-arg> </bean> </beans>
4. 服务端生成校验码
package personal.hutao.captcha; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import javax.imageio.ImageIO; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.octo.captcha.service.image.ImageCaptchaService; @Controller @RequestMapping("/captcha") public class JcaptchaImageCreater { private Logger logger = LoggerFactory.getLogger(getClass()); @Autowired private ImageCaptchaService imageCaptchaService; @RequestMapping public void handleRequest(HttpServletRequest request, HttpServletResponse response) { try { ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream(); String captchaId = request.getSession().getId(); BufferedImage challenge = imageCaptchaService.getImageChallengeForID(captchaId, request.getLocale()); response.setHeader("Cache-Control", "no-store"); response.setHeader("Pragma", "no-cache"); response.setDateHeader("Expires", 0L); response.setContentType("image/jpeg"); ImageIO.write(challenge, "jpeg", jpegOutputStream); byte[] captchaChallengeAsJpeg = jpegOutputStream.toByteArray(); ServletOutputStream respOs = response.getOutputStream(); respOs.write(captchaChallengeAsJpeg); respOs.flush(); respOs.close(); } catch (IOException e) { logger.error("generate captcha image error: {}", e.getMessage()); } } }
5. 页面调用
<input type="text" id="captcha" name="captcha" maxlength="4" /> <img src="captcha" onclick="this.src=‘captcha?d=‘+new Date().getTime()"/>
如图:
6. 提交登录表单后,校验
package personal.hutao.controller; import javax.servlet.http.HttpServletRequest; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import com.octo.captcha.service.image.ImageCaptchaService; @RequestMapping("/login") @Controller public class LoginController { @Autowired private ImageCaptchaService imageCaptchaService; @RequestMapping(value = "/doLogin", method = RequestMethod.POST) @ResponseBody public Boolean login(String username, String password, String captcha, HttpServletRequest request) { Boolean result = Boolean.FALSE; Boolean isResponseCorrect = imageCaptchaService.validateResponseForID(request.getSession().getId(), captcha); if (isResponseCorrect) { // 继续校验用户名密码等.. } return result; } }
时间: 2024-10-07 15:33:25