springMVC引入kaptcha

引入依赖

<dependency>
    <groupId>com.github.axet</groupId>
        <artifactId>kaptcha</artifactId>
    <version>0.0.9</version>
</dependency>

Spring-mvc.xml添加

<!-- Kaptcha验证码生成器 -->
    <bean name="producer" class="com.google.code.kaptcha.impl.DefaultKaptcha" scope="singleton">
        <property name="config">
            <bean class="com.google.code.kaptcha.util.Config">
                <constructor-arg>
                    <props>
                        <prop key="kaptcha.border">no</prop>
                        <prop key="kaptcha.textproducer.font.color">black</prop>
                        <prop key="kaptcha.textproducer.char.space">5</prop>
                        <prop key="kaptcha.textproducer.char.length">5</prop>
                        <prop key="kaptcha.obscurificator.impl">com.google.code.kaptcha.impl.ShadowGimpy</prop>
                        <!-- 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    -->
                    </props>
                </constructor-arg>
            </bean>
        </property>
    </bean>

生成验证码

@RequestMapping(value = "/captchaImg", method = RequestMethod.GET)
public void image(HttpServletRequest request, HttpServletResponse response) throws Exception {
    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");
    String capText = captchaProducer.createText();
    //生成图片验证码
    BufferedImage image = captchaProducer.createImage(capText);
    //保存到shiro session
    SecurityUtils.getSubject().getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

    ServletOutputStream out = response.getOutputStream();
    ImageIO.write(image, "jpg", out);
    try {
        out.flush();
    } finally {
        out.close();
    }
}

验证验证码

@RequestMapping(value = "/captchaValid", method = RequestMethod.POST)
@ResponseBody
public Message captchaValid(String captcha) throws Exception {
    String kaptcha = SecurityUtils.getSubject().getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY).toString();
    SecurityUtils.getSubject().getSession().removeAttribute(Constants.KAPTCHA_SESSION_KEY);
    if (captcha.equalsIgnoreCase(kaptcha)) {
        return Message.success("验证成功");
    }
    return Message.error("验证码不正确");
}

合并后为

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.apache.shiro.SecurityUtils;
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 javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;

/**
 * Controller - 验证码
 *
 * @author liaoyx
 * @version 1.0
 */
@Controller("mgmtCaptchaController")
@RequestMapping("/mgmt/captcha")
public class CaptchaController extends BaseController {

    private Producer captchaProducer = null;

    @Autowired
    public void setCaptchaProducer(Producer captchaProducer) {
        this.captchaProducer = captchaProducer;
    }

    @RequestMapping(value = "/captchaImg", method = RequestMethod.GET)
    public void image(HttpServletRequest request, HttpServletResponse response) throws Exception {
        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");
        String capText = captchaProducer.createText();
        //生成图片验证码
        BufferedImage image = captchaProducer.createImage(capText);
        //保存到shiro session
        SecurityUtils.getSubject().getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(image, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
    }

    @RequestMapping(value = "/captchaValid", method = RequestMethod.POST)
    @ResponseBody
    public Message captchaValid(String captcha) throws Exception {
        String kaptcha = SecurityUtils.getSubject().getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY).toString();
        SecurityUtils.getSubject().getSession().removeAttribute(Constants.KAPTCHA_SESSION_KEY);
        if (captcha.equalsIgnoreCase(kaptcha)) {
            return R.success("验证成功");
        }
        return R.error("验证码不正确");
    }

}

参数详解