1. /**
    2.  * Feign统一Token拦截器
    3.  */
    4. @Component
    5. public class FeignTokenInterceptor implements RequestInterceptor {
    7.     @Override
    8.     public void apply(RequestTemplate requestTemplate) {
    9.         if(null==getHttpServletRequest()){
    10.             //此处省略日志记录
    11.             return;
    12.         }
    13.         //将获取Token对应的值往下面传
    14.         requestTemplate.header("oauthToken", getHeaders(getHttpServletRequest()).get("oauthToken"));
    15.     }
    17.     private HttpServletRequest getHttpServletRequest() {
    18.         try {
    19.             return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
    20.         } catch (Exception e) {
    21.             return null;
    22.         }
    23.     }
    25.     /**
    26.      * Feign拦截器拦截请求获取Token对应的值
    27.      * @param request
    28.      * @return
    29.      */
    30.     private Map<String, String> getHeaders(HttpServletRequest request) {
    31.         Map<String, String> map = new LinkedHashMap<>();
    32.         Enumeration<String> enumeration = request.getHeaderNames();
    33.         while (enumeration.hasMoreElements()) {
    34.             String key = enumeration.nextElement();
    35.             String value = request.getHeader(key);
    36.             map.put(key, value);
    37.         }
    38.         return map;
    39.     }
    40. }

    代码见：
    https://github1s.com/springcloud/spring-cloud-code/blob/HEAD/ch4-5/ch4-5-consumer/src/main/java/cn/springcloud/book/feign/Interceptor/FeignTokenInterceptor.java#L14-L53