一、背景

一些比较重要的微服务，我们暴露的接口可能会希望安全性更高一些，此时，我们会给这些接口增加一些鉴权，如比较简单且方便的鉴权方式Basic Auth鉴权，此时，针对这些有Basic Auth鉴权的接口，我们该如何写Feign，其实是通过覆盖Feign的默认配置来支持鉴权。

二、 步骤

FeignClient的属性configuration增加自定义配置Configuration.class

@FeignClient(name = "mytest-server", configuration = Configuration.class)
public interface Client {
    //..
}

Configuration.class如下(特别注意，别加@Configuration注解，避免扫包扫到导致给全局的Feign都增加了BasicAuthRequestInterceptor拦截器)：

import feign.auth.BasicAuthRequestInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
 * basic验证配置
 */
@EnableConfigurationProperties({Properties.class})
public class Configuration {
    @Autowired
    private Properties properties;
    public Configuration() {
    }
    @Bean
    public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
        return new BasicAuthRequestInterceptor(properties.getUsername(), properties.getPassword());
    }
}

其中Properties.java为

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
/**
 * basic验证配置
 */
@ConfigurationProperties(prefix = "mytest")
@Data
public class Properties {
    private String username;
    private String password;
}

application.yaml增加basic auth账号密码配置如下：

mytest:
    username: test
    password: 123456