前言：承接上一章节《Nacos discovery》 ，在 Nacos discovery 基础上集成openFeign

1、修改调用方配置文件

1.1、增加springcloud依赖

<dependencyManagement><dependencies><!--spring cloud 依赖--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>2021.0.5</version><type>pom</type><scope>import</scope></dependency><!--spring cloud alibaba 依赖--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>2021.0.4.0</version><type>pom</type><scope>import</scope></dependency></dependencies>
</dependencyManagement>

1.2、增加openFeign依赖项

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-loadbalancer --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-loadbalancer</artifactId></dependency>
</dependencies>

2、调用方代码改造

2.1、在启动类增加openFeign配置

@EnableFeignClients

2.2、新增服务层接口：UserService

import com.xxx.common.entity.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;@FeignClient(name = "app-provider-service")
public interface UserService {@GetMapping("/user/getUserName")public User getUserName() ;
}

2.3、改造控制层方法：

@Autowired
private UserService userService;@GetMapping("/getUserName")
public Map getUserName() {User user = userService.getUserName();Map map = new HashMap();map.put("code" , 200);map.put("data" , user);map.put("type" , "caller");return map;
}