摘要：引入依賴添加驗證碼生成器是否有邊框默認為我們可以自己設置，邊框顏色默認為邊框粗細度默認為驗證碼生成器默認為驗證碼文本生成器默認為驗證碼文本字符內容范圍默認為驗證碼文本字符長度默認為驗證碼文本字體樣式默認為驗證碼文本字符大小默

引入依賴

    com.github.axet
        kaptcha
    0.0.9

Spring-mvc.xml添加

    
        
            
                
                    
                        no
                        black
                        5
                        5
                        com.google.code.kaptcha.impl.ShadowGimpy
                        
                    
                
            
        
    

生成驗證碼

@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();
    //生成圖片驗證碼
    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();
    }
}

驗證驗證碼

@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("驗證成功");
    }
    return Message.error("驗證碼不正確");
}

合并后為

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 - 驗證碼
 *
 * @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();
        //生成圖片驗證碼
        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("驗證成功");
        }
        return R.error("驗證碼不正確");
    }

}

參數詳解