【SpringBoot学习十】springboot+kaptcha实现验证码功能

kaptcha是一个java的验证码组件，实现验证码功能，不多说废话，直接上代码

1.pom.xml

    com.github.penggle
    kaptcha
    2.3.2

2.创建配置类

@Configuration
public class KaptchaConfig {
    @Bean(name="captchaProducer")
    public DefaultKaptcha getKaptchaBean(){
        DefaultKaptcha defaultKaptcha=new DefaultKaptcha();
        Properties properties=new Properties();
        properties.setProperty("kaptcha.textproducer.char.string", "123456789abcdefg");//验证码字符范围
        properties.setProperty("kaptcha.border.color", "227,231,234");//图片边框颜色245,248,249
        properties.setProperty("kaptcha.textproducer.font.color", "black");//字体颜色
        properties.setProperty("kaptcha.textproducer.char.space", "2");//文字间隔
        properties.setProperty("kaptcha.image.width", "125");//图片宽度
        properties.setProperty("kaptcha.image.height", "45");//图片高度
        properties.setProperty("kaptcha.session.key", "code");//session的key
        properties.setProperty("kaptcha.textproducer.char.length", "4");//长度
        properties.setProperty("kaptcha.textproducer.font.names", "宋体,楷体,微软雅黑");//字体
        Config config=new Config(properties);
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }
}

3.创建验证码拦截器

//验证码校验拦截器，在登陆校验前先校验验证码，如果验证码通过再进行登陆验证，此配置需要在上文提到的SecurityConfig类中配置
public class KaptchaAuthenticationFilter extends AbstractAuthenticationProcessingFilter {
    private String servletPath;
    public KaptchaAuthenticationFilter(String servletPath, String failureUrl) {
        super(servletPath);
        this.servletPath = servletPath;
        setAuthenticationFailureHandler(new SimpleUrlAuthenticationFailureHandler(failureUrl));
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse res = (HttpServletResponse) response;
        if ("POST".equalsIgnoreCase(req.getMethod()) && servletPath.equals(req.getServletPath())) {
            String expect = (String) req.getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY);
            if (expect != null && !expect.equalsIgnoreCase(req.getParameter("kaptcha"))) {
                unsuccessfulAuthentication(req, res, new InsufficientAuthenticationException("输入的验证码不正确"));
                return;
            }
        }
        chain.doFilter(request, response);
    }
    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException, IOException, ServletException {
        return null;
    }
}

4.SecurityConfig验证配置类，此类是集成springsecurity后的验证类

@Override
    protected void configure(HttpSecurity http) throws Exception {
         //在认证用户名之前认证验证码，如果验证码错误，将不执行用户名和密码的认证
        //KaptchaAuthenticationFilter参数说明：第一个是拦截的请求，第二个参数是验证码验证失败后的请求
         http.addFilterBefore(new KaptchaAuthenticationFilter("/login","/authority/login?meg='验证码错误'"), UsernamePasswordAuthenticationFilter.class)
        ……..//代码片段，此类的其他代码参见本站“springboot+spring-security实现登录验证”该篇文章
}