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