springMVC使用kaptcha生成验证码

红太狼 2022-05-26 04:24 201阅读 0赞

1、下载kaptcha（gradle）

compile group: 'com.google.code.kaptcha', name: 'kaptcha', version:'2.3.2'

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 type="java.util.Properties">
                        <props>
                            
                            
                            <prop key="kaptcha.image.width">115</prop>
                            <prop key="kaptcha.image.height">50</prop>
                            
                            
                            
                            <prop key="kaptcha.textproducer.char.length">4</prop>
                            <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
                        </props>
                    </constructor-arg>
                </bean>
            </property>
        </bean>

3、Controller的实现

import com.google.code.kaptcha.Producer;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    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.servlet.ModelAndView;
    
    import javax.imageio.ImageIO;
    import javax.servlet.ServletOutputStream;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.awt.image.BufferedImage;
    import java.io.IOException;
    
    @Controller
    @RequestMapping(value = "/kaptcha")
    public class KaptchaController {
    
        private final Log log = LogFactory.getLog(this.getClass());
        @Autowired
        private Producer captchaProducer = null;
    
        @RequestMapping(value = "/updImg", method = {RequestMethod.GET})
        public ModelAndView updImg(HttpServletRequest request, HttpServletResponse response) throws IOException {
            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();
            log.info("生成验证码串为：" + capText);
            BufferedImage bi = captchaProducer.createImage(capText);
            ServletOutputStream out = response.getOutputStream();
            ImageIO.write(bi, "jpg", out);
            try {
                out.flush();
            } finally {
                out.close();
            }
            return null;
        }
    }

4、JS调用

var imgUrl = '/kaptcha/updImg?' + Math.floor(Math.random()*100);
    $("#codeImg").hide().attr('src', imgUrl).fadeIn();

5、kaptcha可配置项

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