Feign-RestTemplate请求登录后获取Response Headers中的set-cookie放入下一个请求的Request Header中，以便认证通过。

我需要获取从一个restTemplate响应中收到的cookie，并将其传递给另一个请求。

整体思路如下：

1.用RestTemplate请求第三方服务的登录接口获取到对应的ResponseEntity。

2.从ResponseEntity中获取HttpHeaders，从HttpHeaders中获取Set-cookie。
3.将Set-cookie值放进本地map中。
4.在下一个请求的时候将cookie值放进Request header中。

具体代码如下：

@Slf4j
@Configuration
public class FeignOAuth2RequestInterceptor implements RequestInterceptor {

    @Resource
    private xxxxLoginClient xxxxxLoginClient;

    private Map xxxxLogincookieMap = Maps.newHashMap();

    private final String XXX_LOGIN_cookie = "xxxx_login_cookie";

    private final String HEADER_cookie_NAME = "cookie";

    private final String XXX_LOGIN_URL = "/user/login";

    @Override
    public void apply(RequestTemplate requestTemplate) {
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

        String feignTargetUrl = requestTemplate.feignTarget().url();
        cookie[] cookies = request.getcookies();
        String requestURI = request.getRequestURI();

        boolean urlNotBlank = StringUtils.isNotBlank(requestURI);
        boolean isxxxxServer = StringUtils.equalsIgnoreCase(feignTargetUrl, "http://localhost:9090/xxxx");

        if (urlNotBlank && isxxxxServer) {

            String loginUrl = "http://localhost:9090/xxxx" + XXX_LOGIN_URL + "?username=zclh&password=123456";
            ResponseEntity postResult = RestTemplateUtils.post(loginUrl, XxxResult.class);

            HttpHeaders headers = postResult.getHeaders();

            List cookieList = headers.get("Set-cookie");

            if (CollectionUtils.isNotEmpty(cookieList)) {
                String cookie = cookieList.get(0);
                xxxLogincookieMap.put(XXX_LOGIN_cookie, cookie);
            }
        }

        log.info("cookies:{}", JSONObject.toJSONString(cookies));

        String accessToken = request == null ? StringUtils.EMPTY : request.getHeader(HttpHeaders.AUTHORIZATION);
        log.info("Feign拦截器，拦截到Feign的Http请求发送，从当前Request的Header中获取AUTHORIZATION值为：{}", accessToken);
        requestTemplate.header(HttpHeaders.AUTHORIZATION, accessToken);
        requestTemplate.header(HEADER_cookie_NAME, xxxLogincookieMap.get(XXX_LOGIN_cookie));
    }
}