引入依赖包

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

定义服务熔断，实现服务接口

@Named("userWebServiceFallback")
public class UserWebServiceFallback implements UserWebServiceApi {

	private static final Logger log = LoggerFactory.getLogger(UserWebServiceFallback.class);

	@Override
	public ResultVO<UserInfoEntity> findByAccount(String account) {
		log.error("findByAccount service api hystrix.");
		ResultVO<UserInfoEntity> result = ResultVoFactory.createErrorResult();
		result.setDetail("find user info by findByAccount hystrix fallback.");
		return result;
	}
}

@FeignClient(value = "user-web", fallback = UserWebServiceFallback.class)
public interface UserWebServiceApi {
	/**
	 * <p>查找用户信息</p>
	 *
	 * @param account
	 * @return
	 */
	@RequestMapping(value = "/userweb/findByAccount", produces = "application/json")
	public ResultVO<UserInfo> findByAccount(@RequestParam("account") String account);

}

启动熔断

启动类增加启用注解：@EnableCircuitBreaker
application.yaml配置文件增加启用配置：
feign:
  hystrix:
    enabled: true