Spring Cloud （ openFeign 服务发现、配置、公共client抽取 ）

以下是使用Spring Cloud和OpenFeign进行服务发现、配置管理和公共client抽取的示例代码：

1. 公共client抽取（CommonClient.java）:

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
 
@FeignClient(name = "service-provider", url = "${service-provider.url}")
public interface CommonClient {
    @GetMapping("/greeting")
    String greeting();
}

2. 服务提供者（ServiceProviderController.java）:

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class ServiceProviderController {
 
    @Value("${greeting.message:Hello from service-provider}")
    private String greetingMessage;
 
    @GetMapping("/greeting")
    public String greeting() {
        return greetingMessage;
    }
}

3. 服务消费者（ConsumerApplication.java和ConsumerController.java）:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
 
@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class ConsumerApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.class, args);
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class ConsumerController {
 
    @Autowired
    private CommonClient commonClient;
 
    @GetMapping("/consumer/greeting")
    public String greeting() {
        return commonClient.greeting();
    }
}

4. application.yml配置（服务提供者和消费者）:

spring:
  application:
    name: service-provider
---
spring:
  application:
    name: service-consumer
  cloud:
    config:
      uri: http://config-server
    discovery:
      enabled: true
      service-id: config-server

5. bootstrap.yml配置:

spring:
  cloud:
    config:
      profile: ${spring.profiles.active}
      label: mast