java验证码Kaptcha

aptcha 是一个可高度配置的实用验证码生成工具

生成不重复验证码Java？一、最新的maven源

<!-- https://mvnrepository.com/artifact/com.github.penggle/kaptcha -->
<dependency><groupId>com.github.penggle</groupId><artifactId>kaptcha</artifactId><version>2.3.2</version>
</dependency>

二、Kaptcha 详细配置表

三、使用示例：

需要编写两个类1个配置类和一个Controller

代码如下：

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import java.util.Properties;/*** KaptchaConfig*/
@Configuration
public class KaptchaConfig{/*** 验证码 生成的bean*/@Beanpublic DefaultKaptcha captchaProducer() {DefaultKaptcha captchaProducer = new DefaultKaptcha();Properties properties = new Properties();properties.setProperty(Constants.KAPTCHA_IMAGE_WIDTH, "100");properties.setProperty(Constants.KAPTCHA_IMAGE_HEIGHT, "30");properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_FONT_SIZE, "22");properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "4");properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_SPACE, "6");properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_FONT_COLOR, "black");properties.setProperty(Constants.KAPTCHA_BORDER_COLOR, "LIGHT_GRAY");properties.setProperty(Constants.KAPTCHA_BACKGROUND_CLR_FROM, "WHITE");properties.setProperty(Constants.KAPTCHA_NOISE_IMPL, "com.google.code.kaptcha.impl.NoNoise");properties.setProperty(Constants.KAPTCHA_OBSCURIFICATOR_IMPL, "com.google.code.kaptcha.impl.ShadowGimpy");properties.setProperty(Constants.KAPTCHA_TEXTPRODUCER_CHAR_STRING, "0123456789");properties.setProperty(Constants.KAPTCHA_SESSION_CONFIG_KEY, "checkCode");Config config = new Config(properties);captchaProducer.setConfig(config);return captchaProducer;}}

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
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 javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
//http://localhost:3721/mapserver_war_exploded/kaptcha/getCode
@Controller
@RequestMapping("/kaptcha")
public class KaptchaController {@Autowiredprivate Producer captchaProducer;@RequestMapping("/getCode")public ModelAndView getKaptchaImage(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");response.setContentType("image/jpeg");// create the text for the imageString capText = captchaProducer.createText();// store the text in the sessionrequest.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);// create the image with the textBufferedImage bi = captchaProducer.createImage(capText);ServletOutputStream out = response.getOutputStream();// write the data outImageIO.write(bi, "jpg", out);try {out.flush();} finally {out.close();}return null;}
}