9、OpenFeign服务接口调用

1、概述

OpenFeign是什么

能干吗

Feign和OpenFeign的区别

2、Feign使用步骤

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud2021</artifactId>
        <groupId>com.test.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-feign-order80</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.test.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!--  open feign      -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>
</project>

application.yml

server:
  port: 80
spring:
  application:
    name: consumer-feign-order
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
management:
  endpoints:
    web:
      exposure:
        include: "*"
feign:
  okhttp: true
  httpclient: false

PaymentFeignService

@Component
@FeignClient(name = "nacos-payment-provider")
public interface PaymentFeignService {

    @GetMapping(value = "/payment/nacos/{id}")
    public String getPayment(@PathVariable("id") Long id);
}

OrderFeignController

@RestController
public class OrderFeignController {
    @Resource
    private PaymentFeignService paymentFeignService;

    @GetMapping(value = "/consumer/payment/nacos/{id}")
    public String getPayment(@PathVariable("id") Long id) {
        return paymentFeignService.getPayment(id);
    }
}

3、Feign超时时间

feign:
  client:
    config:
      default:
        #建立连接所用的时间，适用于网络状况正常的情况下，两端连接所需要的时间
        ConnectTimeOut: 1000
        #指建立连接后从服务端读取到可用资源所用的时间
        ReadTimeOut: 1000

4、Feign日志

application.yml

#feign 日志以什么级别监控那个接口
logging:
  level:
    com.test.springcloud.service: debug

config

@Configuration
public class OpenFeignConfig {
    @Bean
    Logger.Level feignLoggerLevel() {
        return Logger.Level.FULL;
    }
}