springboot +thymeleaf+ kaptcha （图片验证码） 配置

springboot中整合thymeleaf ，之前试了好多次，有几个点要注意一下。
1.首先搭建springboot 这个就不说了。
2.然后添加依赖

 
            
                org.springframework.boot
                spring-boot-starter-thymeleaf
            
        这个是要的springboot 默认HTML5严格规范 有些不闭合的标签会报错，使用这个防止这个错误，
            
                nekohtml
                nekohtml
                1.9.6.2
            
简单配置一下：application.yml  
   spring:
     thymeleaf:
        mode: LEGACYHTML5
        prefix: classpath:/templates/
        suffix: .html
        content-type: text/html
        cache: false
        encoding: utf-8
  相信有开发经验的同学都知道意思           

扩展一个小知识点：（跟本项目没有关系）
Spring Boot的默认静态资源的路径为：
spring.resources.static-locations=classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/

3.简单创建几个页面 index.html

   

// 如果要使用th标签的话上面这个链接不能少（就相当于jsp的jstl一样）

    
    

login.html

4.添加kaptcha 验证码依赖

  
            
                com.github.penggle
                kaptcha
                2.3.2
            

5.配置KaptchaConfig

  package com.example.demowebapp.config;

    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 java.util.Properties;

    @Configuration public class KaptchaConfig {     @Bean
        public DefaultKaptcha getDefaultKaptcha() {
            DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
            Properties properties = new Properties();
            // 图片边框
            properties.setProperty("kaptcha.border", "yes");
            // 边框颜色
            properties.setProperty("kaptcha.border.color", "105,179,90");
            // 字体颜色
            properties.setProperty("kaptcha.textproducer.font.color", "red");
            // 图片宽
            properties.setProperty("kaptcha.image.width", "110");
            // 图片高
            properties.setProperty("kaptcha.image.height", "40");
            // 字体大小
            properties.setProperty("kaptcha.textproducer.font.size", "30");
            // session key
            properties.setProperty("kaptcha.session.key", "code");
            // 验证码长度
            properties.setProperty("kaptcha.textproducer.char.length", "4");
            // 字体
            properties.setProperty("kaptcha.textproducer.font.names", "宋体,楷体,微软雅黑");
            Config config = new Config(properties);
            defaultKaptcha.setConfig(config);

            return defaultKaptcha;
        } }

6.访问confroller

/**
* @author
* @date 2018/8/21 10:50
*/
@Controller
public class LoginThymeleafController {

@Autowired
private DefaultKaptcha captchaProducer;

/**
 * 获取验证码 的 请求路径
 * @param httpServletRequest
 * @param httpServletResponse
 * @throws Exception
 */
@RequestMapping("/defaultKaptcha")
public void defaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception{
    byte[] captchaChallengeAsJpeg = null;
    ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
    try {
        //生产验证码字符串并保存到session中
        String createText = captchaProducer.createText();
        httpServletRequest.getSession().setAttribute("vrifyCode", createText);
        //使用生产的验证码字符串返回一个BufferedImage对象并转为byte写入到byte数组中
        BufferedImage challenge = captchaProducer.createImage(createText);
        ImageIO.write(challenge, "jpg", jpegOutputStream);
    } catch (IllegalArgumentException e) {
        httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
        return;
    }

    //定义response输出类型为image/jpeg类型，使用response输出流输出图片的byte数组
    captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
    httpServletResponse.setHeader("Cache-Control", "no-store");
    httpServletResponse.setHeader("Pragma", "no-cache");
    httpServletResponse.setDateHeader("Expires", 0);
    httpServletResponse.setContentType("image/jpeg");
    ServletOutputStream responseOutputStream =
            httpServletResponse.getOutputStream();
    responseOutputStream.write(captchaChallengeAsJpeg);
    responseOutputStream.flush();
    responseOutputStream.close();
}


/**
 * 验证的方法
 * @param httpServletRequest
 * @param httpServletResponse
 * @return
 */
@RequestMapping("/imgvrifyControllerDefaultKaptcha")
public ModelAndView imgvrifyControllerDefaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){
    ModelAndView andView = new ModelAndView();
    String captchaId = (String) httpServletRequest.getSession().getAttribute("vrifyCode");
    String parameter = httpServletRequest.getParameter("vrifyCode");
    System.out.println("Session  vrifyCode "+captchaId+" form vrifyCode "+parameter);

    if (!captchaId.equals(parameter)) {
        andView.addObject("info", "错误的验证码");
        andView.setViewName("index");
    } else {
        andView.addObject("info", "登录成功");
        andView.setViewName("success");
    }
    return andView;
}

@RequestMapping("/login")
public String  login(){

    return "login";
}

}

效果：

spring boot整合Thymeleaf的那些坑