SpringBoot实现过滤器Filter的三种方式

@Slf4j
@WebFilter(urlPatterns = "/*")
public class MyFilter implements Filter {
    @Resource
    private RedisTemplate redisTemplate;
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        //获取访问 ip 地址
        String ipAddr = getIpAddr(request);
        // 存入缓存10s不允许访问
        String key = new StringBuilder().append("bizKey").append(ipAddr).toString();
        if (redisTemplate.hasKey(key)) {
            // 访问次数自增1
            redisTemplate.opsForValue().increment(key, 1);
            log.warn("访问过快，存在强刷行为！key={}", key);
        } else {
            // 第一次访问
            redisTemplate.opsForValue().set(key, 1, 10,
                    TimeUnit.SECONDS);
        }
        try {
            filterChain.doFilter(servletRequest, servletResponse);
        } catch (Exception e) {
            log.warn("认证失败，e:{},url:{},parameters:{}", e,request.getRequestURL(),request.getParameterMap());
            servletResponse.setContentType("application/json");
            servletResponse.setCharacterEncoding("UTF-8");
            servletResponse.getWriter().write(JSONUtil.toJsonStr(Result.fail("业务执行报错~")));
        }
    }
    @Override
    public void destroy() {
        Filter.super.destroy();
    }
    public static String getIpAddr(HttpServletRequest request){
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("X-Forwarded-For");
            if (ipAddress != null && ipAddress.length() != 0 && !"unknown".equalsIgnoreCase(ipAddress)) {
                // 多次反向代理后会有多个ip值，第一个ip才是真实ip
                if (ipAddress.indexOf(",") != -1) {
                    ipAddress = ipAddress.split(",")[0];
                }
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("HTTP_CLIENT_IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
            }
        }catch (Exception e) {
        }
        return ipAddress;
    }
}

@Component
@Order(1)
public class MyFilter1 implements Filter {
    // ...
}
@Component
@Order(2)
public class MyFilter2 implements Filter {
    // ...
}

public class MyFilter1 implements Filter {
    // ...
}
public class MyFilter2 implements Filter {
    // ...
}

@Configuration
public class DemoConfiguration {
    @Bean
    public FilterRegistrationBean RegistTest1(){
        //通过FilterRegistrationBean实例设置优先级可以生效
        //通过@WebFilter无效
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new Test1Filter());//注册自定义过滤器
        bean.setName("flilter1");//过滤器名称
        bean.addUrlPatterns("/*");//过滤所有路径
        bean.setOrder(1);//优先级，最顶级
        return bean;
    }
    @Bean
    public FilterRegistrationBean RegistTest2(){
        //通过FilterRegistrationBean实例设置优先级可以生效
        //通过@WebFilter无效
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new Test2Filter());//注册自定义过滤器
        bean.setName("flilter2");//过滤器名称
        bean.addUrlPatterns("/test/*");//过滤所有路径
        bean.setOrder(6);//优先级，越低越优先
        return bean;
    }
}