Spring Cloud升级后如何在DiscoveryClient中添加setAdditionalFilters

针对新版本Spring Cloud中DiscoveryClient.DiscoveryClientOptionalArgs被移除/弃用的情况，你可以通过以下两种方式实现给服务发现请求添加JWT请求头的需求：

通用方案：使用ClientHttpRequestInterceptor #

这种方式适配所有基于Spring Cloud Commons的服务发现组件，无需依赖Jersey：

1. 自定义请求拦截器
   实现ClientHttpRequestInterceptor，注入你的jwtAuthRequestDecorator来添加请求头：

import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import java.io.IOException;

public class DiscoveryAuthInterceptor implements ClientHttpRequestInterceptor {

    private final JwtAuthRequestDecorator jwtAuthRequestDecorator;

    public DiscoveryAuthInterceptor(JwtAuthRequestDecorator jwtAuthRequestDecorator) {
        this.jwtAuthRequestDecorator = jwtAuthRequestDecorator;
    }

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        // 将JWT请求头添加到服务发现请求中
        request.getHeaders().addAll(jwtAuthRequestDecorator.getHeaders());
        return execution.execute(request, body);
    }
}

2. 注册拦截器到服务发现的RestTemplate
   通过配置类将拦截器注入到服务发现使用的RestTemplate：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.web.client.RestTemplate;

@Configuration
public class DiscoveryClientConfig {

    @Bean
    public ClientHttpRequestInterceptor discoveryAuthInterceptor(JwtAuthRequestDecorator jwtAuthRequestDecorator) {
        return new DiscoveryAuthInterceptor(jwtAuthRequestDecorator);
    }

    @Bean
    public RestTemplate discoveryClientRestTemplate(ClientHttpRequestInterceptor discoveryAuthInterceptor) {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getInterceptors().add(discoveryAuthInterceptor);
        return restTemplate;
    }
}

Eureka专属方案：复用Jersey ClientFilter（如果你用Eureka） #

如果你使用Eureka作为服务发现组件，且已经引入了Jersey依赖，可以通过EurekaClientConfigurer复用你原来的ClientFilterAdapter逻辑：

import com.netflix.discovery.EurekaClientConfigurer;
import com.netflix.discovery.shared.transport.jersey.EurekaJerseyClientImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class EurekaClientConfig {

    @Bean
    public EurekaClientConfigurer eurekaClientConfigurer(JwtAuthRequestDecorator jwtAuthRequestDecorator) {
        return builder -> builder.addClientFilter(new ClientFilterAdapter(jwtAuthRequestDecorator));
    }
}

关键说明 #

• 确保JwtAuthRequestDecorator Bean已正确注册，能够生成有效的JWT请求头。
• 通用方案不依赖Jersey，更符合Spring Cloud新版本的设计趋势；Eureka专属方案可以最小化代码改动，适配你已有的Jersey相关代码。

内容的提问来源于stack exchange，提问作者Tarun Rohila