【SpringBoot】通过Feign调用传递Header中参数

最新推荐文章于 2025-06-04 15:30:33 发布

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#spring boot #java #后端

本文介绍如何在Spring Cloud Feign中实现Header参数的传递。通过自定义RequestInterceptor接口的实现，确保了调用远程服务时能正确携带Header信息，特别针对authorization参数进行了详细说明。

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1、问题描述

我们在SpringCloud中使用Feign请求另一个服务的Api接口时，有将Header中参数传递下去的需求，如果不做特殊处理，就会将Header中的参数丢失。

2、解决方案

通过实现 RequestInterceptor 接口

(1)、首先，自定义实现RequestInterceptor接口的apply方法，如下

package com.shareworx.auth.security.feign;

import feign.Logger;
import feign.RequestInterceptor;
import feign.RequestTemplate;
import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;

public class CommonFeignConfiguration implements RequestInterceptor {


    @Override
    public void apply(RequestTemplate template) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
                .getRequestAttributes();
        if (attributes != null) {
            HttpServletRequest request = attributes.getRequest();
            Enumeration<String> headerNames = request.getHeaderNames();
            if (headerNames != null) {
                while (headerNames.hasMoreElements()) {
                    String name = headerNames.nextElement();
                    String values = request.getHeader(name);
                    if (StringUtils.isNotBlank(values) && "authorization".equals(name.toLowerCase())) {
                        template.header(name, values);
                    }
                }
            }
        }
    }

    /**
     * 配置Feign日志级别
     * @return
     */
    @Bean
    Logger.Level feignLoggerLevel(){
        return Logger.Level.FULL;
    }
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

    @Bean
    public Encoder feignFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    }
}

我这边在项目上遇到的只需要传递"authorization"参数，因此多加了一个条件判断

if(StringUtils.isNotBlank(values)&&"authorization".equals(name.toLowerCase())){
        template.header(name,values);
        }

(2)、然后将自定义的配置类配置到Feign中，就可以实现该Feign中接口Header参数的传递

package com.shareworx.auth.security.feign;

import com.shareworx.auth.security.fallback.SecurityBaseUserFeignServiceFallbackFactory;
import com.shareworx.auth.shiro.model.BaseProjectVO;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;


@FeignClient(contextId = "SecurityHoProjectInitFeignService", name = "xx-server",configuration = CommonFeignConfiguration.class)
public interface SecurityHoProjectInitFeignService {

}