SpringCloud Feign如何实现超详细深入解析？

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目录

一、什么是Feign？

二、Feign能干些什么？

三、Feign的使用步骤

1. 新建一个module 2. 配置Pom.xml 3. 配置application.yaml 4. 配置configBean 5. 配置Controller类 6. 配置启动类 7. 修改API引言：引入Feign

目录

• 一、什么是Feign
• 二、Feign能干什么
• 三、Feign的使用步骤
• 1、新建一个module
• 2、配置Pom.xml
• 3、配置applicatin.yaml
• 4、配置configBean
• 5、配置Controller类
• 6、配置启动类
• 7、改动API
• 1）引入Feign依赖
• 2）配置Service
• 3）注意
• 四、结果

一、什么是Feign

Feign是声明式Web Service客户端，它让微服务之间的调用变得更简单，类似controller调用service。SpringCloud集成了Ribbon和Eureka，可以使用Feigin提供负载均衡的maven.apache.org/POM/4.0.0" xmlns:xsi="www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="maven.apache.org/POM/4.0.0 maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>springcloud-demo2</artifactId> <groupId>com.you</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>springcloud-eureka-7001</artifactId> <dependencies> <!-- mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server --> <!--Eureka Server--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId> <version>1.4.6.RELEASE</version> </dependency> <!--热部署--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency> </dependencies> </project>

3、配置applicatin.yaml

server:
port: 801

eureka:
client:
register-with-eureka: false #不向eureka注册自己
service-url:
defaultZone: localhost:7001/eureka/
ribbon:
eureka:
enabled: true

4、配置configBean

package com.you.config; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.client.RestTemplate; @Configuration public class ConfigBean { @Bean @LoadBalanced //ribbon /*配置负载均衡实现RestTemplate*/ /*IRule*/ /*RoundRobinRule 轮询 */ /*RandomRule 随机*/ /*AvailabilityFilteringRule 优先过滤掉跳闸、访问故障的服务，对剩下的进行轮询 */ public RestTemplate getRestTemplate() { return new RestTemplate(); } }

5、配置Controller类

package com.you.config; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.client.RestTemplate; @Configuration public class ConfigBean { @Bean @LoadBalanced //ribbon /*配置负载均衡实现RestTemplate*/ /*IRule*/ /*RoundRobinRule 轮询 */ /*RandomRule 随机*/ /*AvailabilityFilteringRule 优先过滤掉跳闸、访问故障的服务，对剩下的进行轮询 */ public RestTemplate getRestTemplate() { return new RestTemplate(); } }

6、配置启动类

package com.you; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.netflix.ribbon.RibbonClient; import org.springframework.cloud.openfeign.EnableFeignClients; import org.springframework.context.annotation.ComponentScan; @SpringBootApplication @EnableEurekaClient @EnableFeignClients(basePackages = { "com.you"}) public class FeignDeptConsumer_80 { public static void main(String[] args) { SpringApplication.run(FeignDeptConsumer_80.class,args); } }

7、改动API

1）引入Feign依赖

<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-feign</artifactId> <version>1.4.6.RELEASE</version> </dependency>

2）配置Service

package com.you.service; import com.you.pojo.Dept; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.stereotype.Component; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; @Component @FeignClient(value = "SPRINGCLOUD-PROVIDER-DEPT") public interface DeptClientService { @GetMapping("/dept/aDept/{id}") public Dept getDeptOfId(@PathVariable("id") Long id); }

3）注意

服务名字要写对GetMapper中的内容要和提供者一致，否则报错（找了一下午）

下面是提供者的内容

四、结果

这样即可获取到数据，而且负载平衡的默认算法，仍然是轮询！

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