案例 出自 图灵学院,我自己学了一下,然后整了了一下

pom依赖

        <!-- feign调用依赖 -->
        <dependency>
            <groupId>com.netflix.feign</groupId>
            <artifactId>feign-core</artifactId>
            <version>8.18.0</version>
        </dependency>
        <dependency>
            <groupId>com.netflix.feign</groupId>
            <artifactId>feign-jackson</artifactId>
            <version>8.18.0</version>
        </dependency>

feign接口

import com.tuling.common.utils.R;
import com.feigndemo.vo.OrderVo;
import feign.Headers;
import feign.Param;
import feign.RequestLine;
import org.springframework.web.bind.annotation.RequestBody;
public interface RemoteService {
    @Headers({"Content-Type: application/json","Accept: application/json"})
    @RequestLine("GET /order/findOrderByUserId/{userId}") //feign自带的注解
    R findOrderByUserId(@Param("userId") Integer userId);
    /**
     * 对象名字不一定需要一样
     * 参数在request对象中,然后会帮我们解析,封装到对象里面,所以对象名字不需要一样,里面的字段一样就行了.
     * "Accept: application/json"  //指定当前接口接收的json格式的数据
     */
    @Headers({"Content-Type: application/json","Accept: application/json"})
    @RequestLine("POST /order/save")
    public R save(@RequestBody OrderVo order);
}

原生feignAPI调用

import com.feigndemo.vo.OrderVo;
import feign.Feign;
import feign.Request;
import feign.jackson.JacksonDecoder;
import feign.jackson.JacksonEncoder;
public class FeignDemo {
    public static void main(String[] args) {
        //基于json
        RemoteService service = Feign.builder()
                .encoder(new JacksonEncoder()) // 编码方式
                .decoder(new JacksonDecoder())  // 解码方式
                .options(new Request.Options(1000, 3500))//设置超时时间
                //.retryer(new Retryer.Default(5000, 5000, 3))
                .target(RemoteService.class,   //代理对象
                        "http://localhost:8020/"); //目标地址
            int userId = 4;
        OrderVo vo = new OrderVo();
        vo.setCommodityCode("C000003");
        vo.setUserId(userId);
        vo.setCount(5);
        vo.setAmount(200);
        // 保存操作
        System.out.println(service.save(vo));
        System.out.println(service.findOrderByUserId(userId)); //查询操作
    }
}

结果:

{msg=success, code=0}
{msg=success, code=0, orders=[{id=5, userId=4, commodityCode=C000003, count=5, amount=200}, {id=6, userId=4, commodityCode=C000003, count=5, amount=200}]}

代码地址

https://gitee.com/zjj19941/ZJJ_Neaten5.10/tree/master/ZJJ_Feign/protogenesis-feign