Spring与jcaptcha集成

Spring与jcaptcha集成

    博客分类：
    J2ee



需求：

验证码非常常见，那么在spring中使用jcaptcha进行认证那么需要集成

实现：

mvn：
Xml代码  收藏代码

    <!-- code check captcha start --> 
    <dependency> 
        <groupId>com.octo.captcha</groupId> 
        <artifactId>jcaptcha</artifactId> 
        <version>1.0</version> 
    </dependency> 
    <!-- code check captcha end --> 

一般仓库中没有对应的jar，比如imaging-01012005.jar那么需要手动添加仓库
Xml代码  收藏代码

    <repository> 
        <id>atlassian</id> 
        <name>atlassian</name> 
        <url>http://maven.jahia.org/maven2</url> 
        <releases> 
            <enabled>true</enabled> 
        </releases> 
        <snapshots> 
            <enabled>false</enabled> 
        </snapshots> 
    </repository> 

基于注解mvc，那么图片的请求路径为Controller，流程为请求path:/anon/getcode产生验证码

这样spring的配置信息为：
Xml代码  收藏代码

    <context:component-scan base-package="com.someabcd.csr" /> 
    <!-- check code start --> 
    <bean id="captchaService" 
        class="com.octo.captcha.service.multitype.GenericManageableCaptchaService"> 
        <description>验证码服务</description> 
        <constructor-arg index="0"> 
            <ref bean="com.someabcd.csr.web.crsCaptchaEngine" /> 
        </constructor-arg> 
        <constructor-arg index="1"> 
            <value>300</value> 
        </constructor-arg><!--超时时间 秒 --> 
        <constructor-arg index="2"> 
            <value>20000</value> 
        </constructor-arg><!--最大并发数 --> 
        <constructor-arg index="3"> 
            <value>20000</value> 
        </constructor-arg> 
    </bean> 

com.someabcd.csr.web.crsCaptchaEngine类为：
Java代码  收藏代码

    @Component("com.someabcd.csr.web.crsCaptchaEngine") 
    public class CSRCaptchaEngine extends ListImageCaptchaEngine { 
     
        @Override 
        protected void buildInitialFactories() { 
            int minWordLength = 4; 
            int maxWordLength = 5; 
            int fontSize = 50; 
            int imageWidth = 152; 
            int imageHeight = 100; 
            WordGenerator wordGenerator = new RandomWordGenerator( 
                    "0123456789abcdefghijklmnopqrstuvwxyz"); 
            TextPaster randomPaster = new DecoratedRandomTextPaster(minWordLength, 
                    maxWordLength, new RandomListColorGenerator(new Color[] { 
                            new Color(23, 170, 27), new Color(220, 34, 11), 
                            new Color(23, 67, 172) }), new TextDecorator[] {}); 
            BackgroundGenerator background = new UniColorBackgroundGenerator( 
                    imageWidth, imageHeight, Color.white); 
            FontGenerator font = new RandomFontGenerator(fontSize, fontSize, 
                    new Font[] { new Font("nyala", Font.BOLD, fontSize), 
                            new Font("Bell MT", Font.PLAIN, fontSize), 
                            new Font("Credit valley", Font.BOLD, fontSize) }); 
     
            ImageDeformation postDef = new ImageDeformationByFilters( 
                    new ImageFilter[] {}); 
            ImageDeformation backDef = new ImageDeformationByFilters( 
                    new ImageFilter[] {}); 
            ImageDeformation textDef = new ImageDeformationByFilters( 
                    new ImageFilter[] {}); 
     
            WordToImage word2image = new DeformedComposedWordToImage(font, 
                    background, randomPaster, backDef, textDef, postDef); 
            addFactory(new GimpyFactory(wordGenerator, word2image)); 
        } 
    } 

处理请求的Controller：
Java代码  收藏代码

    @Controller 
    @RequestMapping("anon") 
    public class AnonController { 
     
        @Autowired 
        private GenericManageableCaptchaService captchaService; 
     
        @RequestMapping(value = "/getcode", method = RequestMethod.GET) 
        public void getCode(HttpServletRequest httpServletRequest, 
                HttpServletResponse httpServletResponse) { 
     
            byte[] captchaChallengeAsJpeg = null; 
            // 输出jpg的字节流 
            ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream(); 
            try { 
                String captchaId = httpServletRequest.getSession().getId(); 
                BufferedImage challenge = (BufferedImage) captchaService 
                        .getChallengeForID(captchaId, 
                                httpServletRequest.getLocale()); 
     
                // a jpeg encoder 
                JPEGImageEncoder jpegEncoder = JPEGCodec 
                        .createJPEGEncoder(jpegOutputStream); 
                jpegEncoder.encode(challenge); 
                captchaChallengeAsJpeg = jpegOutputStream.toByteArray(); 
     
                // flush it in the response 
                httpServletResponse.setHeader("Cache-Control", "no-store"); 
                httpServletResponse.setHeader("Pragma", "no-cache"); 
                httpServletResponse.setDateHeader("Expires", 0); 
                httpServletResponse.setContentType("image/jpeg"); 
                ServletOutputStream responseOutputStream = httpServletResponse 
                        .getOutputStream(); 
                responseOutputStream.write(captchaChallengeAsJpeg); 
                responseOutputStream.flush(); 
                responseOutputStream.close(); 
            } catch (Exception e) { 
                try { 
                    httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND); 
                } catch (IOException e1) { 
                    e1.printStackTrace(); 
                } 
                return; 
            } 
     
        } 
    } 

验证码的显示：
Java代码  收藏代码

    <tr> 
        <td colspan="2" align="center"> 
            <img  
                    src="${basePath}anon/getcode" 
                    onclick="this.src='${basePath}anon/getcode?d='+new Date()*1" width="160" height="30"/> 
        </td> 
    </tr> 
    <tr> 
        <td height="40" align="right"> 
            <strong> 
                验证码： 
            </strong> 
        </td> 
        <td> 
            <input name="code" type="text" id="code" vld="{required:true}" class="input"/> 
        </td> 
    </tr> 

验证码验证代码块：
Java代码  收藏代码

    Boolean isCorrect = Boolean.FALSE; 
    String captchaId = request.getSession().getId(); 
    String code = request.getParameter("code"); 
    try { 
        isCorrect = captchaService.validateResponseForID(captchaId, 
                code); 
        if (!isCorrect) { 
            log.info("check code error!"); 
            return "usr/tologin"; 
        } 
    } catch (Exception e) { 
        log.error(e.getMessage()); 
    } 

    

备注：

可以把CaptchaEngine也配置的配置文件中，好处是可以随时修改，缺点是20%的事情缺耗费了80%时间，且这20%不重要