bug记录（feign）——如何给feign加上请求头相关的参数，让生产者获得请求头中参数

迷南。 2024-02-21 03:23 34阅读 0赞

![在这里插入图片描述][a7f7f9cdadf84f41b738bccd693a3fca.png]

## 问题描述 ##

在微服务的调用中，如果消费者通过feign调用生产者，然后生产者方法中需要用到请求头，从请求头中获得token，但是feign默认是不携带请求头的，因此即使消费者请求feign的时候请求头中携带了token，也没有传到生产者，就会报相关的错误。

![在这里插入图片描述][702dabe61b8b4cd982f64415aa5c54e9.png]

## 解决方案 ##

### 1.如果token直接在请求头中 ###

![在这里插入图片描述][400e816f89dd45dbbbd28c023f642147.png]

> 解决方案：加一个拦截器

![在这里插入图片描述][a88c3778e5f74734813d30ff6205804f.png]

package com.tianju.rabbit.feign.interceptor;
    
    import feign.RequestInterceptor;
    import feign.RequestTemplate;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    import javax.servlet.http.HttpServletRequest;
    
    @Configuration
    @Slf4j
    public class FeignInterceptor implements RequestInterceptor {
        
        @Override
        public void apply(RequestTemplate requestTemplate) {
        
            // 获取 HttpServletRequest
            ServletRequestAttributes attributes = (ServletRequestAttributes)
                    RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = attributes.getRequest();
    
            String token = request.getHeader("token");
            if (null!=token && !"".equals(token)){
        
                log.info(">>> feign拦截器获取token：{}",token);
                requestTemplate.header("token", token);
            }
        }
    }

![在这里插入图片描述][c1103fe140b24a5dbd03ae0bd2502343.png]

### 2.如果token在cookie里面 ###

![在这里插入图片描述][92f896f8b7d040768ea66c777a0f6fdc.png]  
代码需要稍微做些修改

package com.tianju.rabbit.feign.interceptor;
    
    import feign.RequestInterceptor;
    import feign.RequestTemplate;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    import javax.servlet.http.Cookie;
    import javax.servlet.http.HttpServletRequest;
    
    @Configuration
    @Slf4j
    public class FeignInterceptor implements RequestInterceptor {
        
        @Override
        public void apply(RequestTemplate requestTemplate) {
        
            // 获取 HttpServletRequest
            ServletRequestAttributes attributes = (ServletRequestAttributes)
                    RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = attributes.getRequest();
    
            Cookie[] cookies = request.getCookies();
            for(Cookie cookie:cookies){
        
                if ("token".equals(cookie.getName())){
        
                    // 把TOKEN带到下服务（token消息加到头消息）
                    log.debug(">>>> feign的拦截器，获取token："+cookie.getValue());
                    requestTemplate.header("token",cookie.getValue());
                }
            }
        }
    }

## 总结 ##

给feign加一个拦截器，设置一下请求头。

![在这里插入图片描述][a88c3778e5f74734813d30ff6205804f.png]

[a7f7f9cdadf84f41b738bccd693a3fca.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/0288861882024a288a63fba8977a57ba.png
[702dabe61b8b4cd982f64415aa5c54e9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/0771b113120e47b3bf878894daee4dee.png
[400e816f89dd45dbbbd28c023f642147.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/e5d3bf0507f5409fa346ffbce5e97a46.png
[a88c3778e5f74734813d30ff6205804f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/a78a9b3e39e640149a2baef0f08b09a1.png
[c1103fe140b24a5dbd03ae0bd2502343.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/2599a91a57f6498c94c03cced22d6228.png
[92f896f8b7d040768ea66c777a0f6fdc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/1b90fc9c03a841bda3873e3ad8b37455.png