无法使用RestTemplate接收Set-Cookie字段

import org.springframework.http.HttpHeaders;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.web.client.RequestCallback;
import org.springframework.web.client.ResponseExtractor;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class RestTemplateWithCookie {

    public static void main(String[] args) {
        RestTemplate restTemplate = new RestTemplate();

        // 创建一个拦截器，用于保存Set-Cookie字段的值
        List<ClientHttpRequestInterceptor> interceptors = new ArrayList<>();
        interceptors.add(new CookieInterceptor());
        restTemplate.setInterceptors(interceptors);

        // 发送请求并接收响应
        restTemplate.execute("http://example.com/api", HttpMethod.GET, null, new ResponseExtractor<Object>() {
            @Override
            public Object extractData(ClientHttpResponse response) throws IOException {
                // 在这里可以通过response获取Set-Cookie字段的值
                HttpHeaders headers = response.getHeaders();
                List<String> cookies = headers.get(HttpHeaders.SET_COOKIE);
                // 处理Set-Cookie字段的值
                // ...

                return null;
            }
        });
    }

    // 自定义拦截器，用于保存Set-Cookie字段的值
    private static class CookieInterceptor implements ClientHttpRequestInterceptor {
        @Override
        public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
            ClientHttpResponse response = execution.execute(request, body);
            HttpHeaders headers = response.getHeaders();
            List<String> cookies = headers.get(HttpHeaders.SET_COOKIE);
            // 处理Set-Cookie字段的值
            // ...

            return response;
        }
    }
}