手动创建Feign——电影微服务

一介绍

在某些场景下，自定义Feign的方式满足不了需求，此时可使用Feign Builder API手动创建Feign。

二场景

让电影微服务中的同一个Feign接口，使用不同的账号登录，并调用用户微服务的接口。

三新建项目microservice-consumer-movie-feign-manual

四去掉Feign接口UserFeignClient上的@FeignClient注解

package com.itmuch.cloud.study.user.feign;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.itmuch.cloud.study.user.entity.User;

public interface UserFeignClient {
  @RequestMapping(value = "/{id}", method = RequestMethod.GET)
  public User findById(@PathVariable("id") Long id);
}

五去掉启动类上的@EnableFeignClients注解

package com.itmuch.cloud.study;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient
@SpringBootApplication
public class ConsumerMovieApplication {
  public static void main(String[] args) {
    SpringApplication.run(ConsumerMovieApplication.class, args);
  }
}

六修改Controller如下：

package com.itmuch.cloud.study.user.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.netflix.feign.FeignClientsConfiguration;
import org.springframework.context.annotation.Import;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import com.itmuch.cloud.study.user.entity.User;
import com.itmuch.cloud.study.user.feign.UserFeignClient;

import feign.Client;
import feign.Contract;
import feign.Feign;
import feign.auth.BasicAuthRequestInterceptor;
import feign.codec.Decoder;
import feign.codec.Encoder;

@Import(FeignClientsConfiguration.class)
@RestController
public class MovieController {
  private UserFeignClient userUserFeignClient;

  private UserFeignClient adminUserFeignClient;

  @Autowired
  public MovieController(Decoder decoder, Encoder encoder, Client client, Contract contract) {
    // 这边的decoder、encoder、client、contract，可以debug看看是什么实例。
    this.userUserFeignClient = Feign.builder().client(client).encoder(encoder).decoder(decoder).contract(contract)
        .requestInterceptor(new BasicAuthRequestInterceptor("user", "password1")).target(UserFeignClient.class, "http://microservice-provider-user/");
    this.adminUserFeignClient = Feign.builder().client(client).encoder(encoder).decoder(decoder).contract(contract)
        .requestInterceptor(new BasicAuthRequestInterceptor("admin", "password2"))
        .target(UserFeignClient.class, "http://microservice-provider-user/");
  }

  @GetMapping("/user-user/{id}")
  public User findByIdUser(@PathVariable Long id) {
    return this.userUserFeignClient.findById(id);
  }

  @GetMapping("/user-admin/{id}")
  public User findByIdAdmin(@PathVariable Long id) {
    return this.adminUserFeignClient.findById(id);
  }
}

七测试

1 启动eueka

2 启动user微服务

3 启动movie微服务

4 访问 http://localhost:8000/1

可以正常获得查询结果，同时可以看到用户微服务打印类似以下信息：

当前用户是user，角色是user-role

手动创建Feign——电影微服务

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