springboot2 接口化 http 跨项目调用之 fegin

1，依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

2，启动类添加注解：@EnableFeignClients

3，添加配置启动 fegin

# feign.hystrix.enabled: 启动 fegin 远程调用的熔断机制
feign:
  hystrix:
    enabled: true

4，添加接口，其中 @FeignClient 注解中的 name 为被调用项目的名称，fallback 指定容错的实现类

package com.hwq.web.server.fegin;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(name = "global-api", fallback = SnowFlakeFeginImpl.class)
public interface SnowFlakeFegin {

	@GetMapping("snow-flake/id")
	String getId();

}

5，容错的实现类

package com.hwq.web.server.fegin;

import org.springframework.stereotype.Component;

@Component
public class SnowFlakeFeginImpl implements SnowFlakeFegin {

	@Override
	public String getId() {
		throw new RuntimeException("获取主键失败");
	}

}