Http客户端Feign

2.4 Http客户端Feign

RestTemplate方式调用存在的问题

1. 代码可读性差，编程体验不统一
2. 参数复杂URL难以维护

 
        String url="http://userservice/user/"+order.getUserId();
        User user = restTemplate.getForObject(url, User.class);

2.4.1 定义及使用Feign客户端

①引入依赖

 
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        

②主启动类上加上@EnableFeignClients注解开启Feign的功能

 
@MapperScan("cn.itcast.order.mapper")
@SpringBootApplication
@EnableFeignClients
public class OrderApplicatio