feign

pom

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

application.yml

server:
  port: 9002
spring:
  application:
    name: consumerfeign
eureka:
  client:
    # 表示是否将自己注册进入EurekaServer默认为true
    register-with-eureka: false
    # 是否从EurekaServer抓取已有的注册信息，默认为true
    # 单节点不会有影响，集群环境必须设置为true才能配合ribbon使用负载均衡
    fetch-registry: true
    # 注册到的EurekaServer路径
    service-url:
      defaultZone: http://localhost:7001/eureka

编写接口

FeignClient的value为微服务名字
方法上加上路径

package com.springcloud.service;

import com.springcloud.domain.Empt;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.List;

@Component
@FeignClient(value = "PROVIDER")
public interface EmptFeignService {

    @GetMapping("empt")
    List<Empt> getAll();
}

启用注解

@SpringBootApplication
@EnableFeignClients
public class FeignApplication {

    public static void main(String[] args) {
        SpringApplication.run(FeignApplication.class, args);
    }

}

使用

@RestController
public class AppController {

    @Resource
    private EmptFeignService service;

    @GetMapping
    public List<Empt> getAll() {
        return service.getAll();
    }

}