Spring mvc框架下使用kaptcha生成验证码

1、下载jar包并导入。

　　kaptcha-2.3.2.jar

2、spring 配置文件 applicationContext.xml。

    <bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">

        <property name="config">

            <bean class="com.google.code.kaptcha.util.Config">

                <constructor-arg>

                    <props>
                        <prop key="kaptcha.image.width">65</prop>
                        <prop key="kaptcha.image.height">30</prop>
                        <prop key="kaptcha.textproducer.font.size">25</prop>
                        <prop key="kaptcha.textproducer.font.color">red</prop>
                        <prop key="kaptcha.textproducer.font.names">Arial</prop>
                        <prop key="kaptcha.textproducer.char.string">123456789</prop>
                        <prop key="kaptcha.textproducer.char.length">4</prop>
                        <prop key="kaptcha.obscurificator.impl">com.google.code.kaptcha.impl.ShadowGimpy</prop>
                        <prop key="kaptcha.noise.impl">com.google.code.kaptcha.impl.NoNoise</prop>

                    </props>

                </constructor-arg>

            </bean>

        </property>

    </bean>

配置项如下：

kaptcha.border  是否有边框  默认为true  我们可以自己设置yes，no

kaptcha.border.color   边框颜色   默认为Color.BLACK

kaptcha.border.thickness  边框粗细度  默认为1

kaptcha.producer.impl   验证码生成器  默认为DefaultKaptcha

kaptcha.textproducer.impl   验证码文本生成器  默认为DefaultTextCreator

kaptcha.textproducer.char.string   验证码文本字符内容范围  默认为abcde2345678gfynmnpwx

kaptcha.textproducer.char.length   验证码文本字符长度  默认为5

kaptcha.textproducer.font.names    验证码文本字体样式  默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)

kaptcha.textproducer.font.size   验证码文本字符大小  默认为40

kaptcha.textproducer.font.color  验证码文本字符颜色  默认为Color.BLACK

kaptcha.textproducer.char.space  验证码文本字符间距  默认为2

kaptcha.noise.impl    验证码噪点生成对象  默认为DefaultNoise

kaptcha.noise.color   验证码噪点颜色   默认为Color.BLACK

kaptcha.obscurificator.impl   验证码样式引擎  默认为WaterRipple

kaptcha.word.impl   验证码文本字符渲染   默认为DefaultWordRenderer

kaptcha.background.impl   验证码背景生成器   默认为DefaultBackground

kaptcha.background.clear.from   验证码背景颜色渐进   默认为Color.LIGHT_GRAY

kaptcha.background.clear.to   验证码背景颜色渐进   默认为Color.WHITE

kaptcha.image.width   验证码图片宽度  默认为200

kaptcha.image.height  验证码图片高度  默认为50

3、jsp页面。

    <script type='text/javascript'  src='${base}/js/jquery-1.10.2.min.js'></script>

    <script type="text/javascript">      

        $(function(){

        $('#kaptchaImage').click(function () {//生成验证码

             $(this).hide().attr('src', '${base}/captcha-image.htm?' + Math.floor(Math.random()*100) ).fadeIn();

             event.cancelBubble=true;

            });

        }); 

        function changeCode() {

            $('#kaptchaImage').hide().attr('src', '${base}/captcha-image.htm?' + Math.floor(Math.random()*100) ).fadeIn();

            event.cancelBubble=true;

        }

   </script>

    <div class="chknumber">

          <label>验证码:

              <input name="kaptcha" type="text" id="kaptcha" maxlength="4" class="chknumber_input" />

          </label>

          <br />

          <img src="${base}/captcha-image.htm" id="kaptchaImage"  style="margin-bottom: -3px"/>

          <a href="#" onclick="changeCode()">看不清?换一张</a>

    </div>

4、创建验证码生成控制类CaptchaImageCreateController.java。

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;

import com.google.code.kaptcha.Producer;  

@Controller

@RequestMapping("/")

public class CaptchaImageCreateController {  

    private Producer captchaProducer = null;  

    @Autowired

    public void setCaptchaProducer(Producer captchaProducer) {

        this.captchaProducer = captchaProducer;

    }  

    @RequestMapping("captcha-image")

    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {  

        response.setDateHeader("Expires", 0);

        // Set standard HTTP/1.1 no-cache headers.

        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");

        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).

        response.addHeader("Cache-Control", "post-check=0, pre-check=0");

        // Set standard HTTP/1.0 no-cache header.

        response.setHeader("Pragma", "no-cache");

        // return a jpeg

        response.setContentType("image/jpeg");

        // create the text for the image

        String capText = captchaProducer.createText();

        // store the text in the session

        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

        // create the image with the text

        BufferedImage bi = captchaProducer.createImage(capText);

        ServletOutputStream out = response.getOutputStream();

        // write the data out

        ImageIO.write(bi, "jpg", out);

        try {

            out.flush();

        } finally {

            out.close();

        }

        return null;

    }  

}

5、控制类获取当前验证码。

String kaptchaExpected = (String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

效果如图：

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" alt="" />

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Kaptcha是一个非常实用的验证码生成工具,可以通过配置生成多样化的验证码,以图片的形式显示,从而无法进行复制粘贴:下面将详细介绍下Spring Boot快速集成kaptcha生成验证码的过程. 本 ...
前端控制器是整个MVC框架中最为核心的一块，它主要用来拦截符合要求的外部请求，并把请求分发到不同的控制器去处理，根据控制器处理后的结果，生成相应的响应发送到客户端。前端控制器既可以使用Filter实现（Struts2采用这种方式），也可以使用Servlet来实现(spring MVC框架)。
本文转自http://www.cnblogs.com/davidwang456/p/4090058.html 感谢作者前端控制器是整个MVC框架中最为核心的一块,它主要用来拦截符合要求的外部请求,并 ...

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