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

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

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 OrderApplication {

    public static void main(String[] args) {
        SpringApplication.