SpringCloud Feign如何编写具体的使用代码示例？

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1. 官方文档：[Spring Cloud OpenFeign](https://cloud.spring.io/spring-cloud-static/spring-cloud-openfeign/2.2.2.RELEASE/reference//)

2.添加依赖：

xml org.springframework.boot spring-boot-starter-web

1.官方文档

cloud.spring.io/spring-cloud-static/spring-cloud-openfeign/2.2.2.RELEASE/reference/html/

2.添加依赖

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency>

3.添加启动类注解

import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.openfeign.EnableFeignClients; @SpringBootApplication //@MapperScan("cn.ytheng.order_service") @EnableFeignClients public class OrderServiceApplication { public static void main(String[] args) { SpringApplication.run(OrderServiceApplication.class, args); } }

4.添加Feign接口

import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam; /** * * 商品服务客户端 * product-service: 调用服务名称，即spring.application.name * */ @FeignClient(name = "product-service") public interface ProductClient { @GetMapping("/api/v1/product/find") String getById(@RequestParam("id") int id); }

5.添加Controller

import cn.theng.order_service.service.ProductClient; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/api/v1/order") public class ProductOrderController { @Autowired private ProductClient productClient; @PostMapping("/test2") public Object test2(@RequestParam("product_id") int productId) { String product = productClient.getById(productId); return "success"; } }

6.添加application.yml配置

server: port: 8781 eureka: client: serviceUrl: defaultZone: localhost:8761/eureka/ spring: application: name: order-service #设置调用服务超时时间 #product-service为服务名称，也可以设置为默认值default feign: client: config: product-service: connectTimeout: 5000 readTimeout: 11000

7.访问地址

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