OpenFeign使用步骤

 接口+注解

微服务调用接口+@FeignClient 

Feign自带负载均衡配置项 

 新建cloud-consumer-feign-order80

 假设现在有8001 8002 俩个端口有业务如下：

 即查询数据库 的业务处理部分

 pom文件

  version已经交给父工程管理 

 
    
    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <maven.compiler.source>1.8maven.compiler.source>
        <maven.compiler.target>1.8maven.compiler.target>
        <junit.version>4.12junit.version>
        <log4j.version>1.2.17log4j.version>
        <lombok.version>1.16.18lombok.version>
        <mysql.version>8.0.16mysql.version>
        <druid.version>1.1.16druid.version>
        <mybatis.spring.boot.version>1.3.0mybatis.spring.boot.version>
    properties>

<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>mscloud03artifactId>
        <groupId>com.atguigu.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
 
    <artifactId>cloud-consumer-feign-order80artifactId>
 
    <dependencies>
        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
        dependency>
        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
        dependency>
        
        <dependency>
            <groupId>com.atguigu.springcloudgroupId>
            <artifactId>cloud-api-commonsartifactId>
            <version>${project.version}version>
        dependency>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-actuatorartifactId>
        dependency>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-devtoolsartifactId>
            <scope>runtimescope>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>
 
 
project>

 yml文件

注册中心由 eureka提供在7001 7002端口

server:
  port: 80
 
eureka:
  client:
    register-with-eureka: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/

 主启动类（@EnableFeignClients）

试验箱A8 使用方法

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@SpringBootApplication
@EnableFeignClients
public class OrderFeignMain80 {
    public static void main(String[] args)
    {
        SpringApplication.run(OrderFeignMain80.class,args);
    }
}

 新建PaymentFeignService接口并新增注解@FeignClient

@Component
@FeignClient(value = "CLOUD-PAYMENT-SERVICE")
public interface PaymentFeignService
{
    @GetMapping(value = "/payment/get/{id}")
    CommonResult getPaymentById(@PathVariable("id") Long id);
}

 @FeignClient(value = "CLOUD-PAYMENT-SERVICE") 括号里面的值就是8001 8002 的服务程序名称

 控制层

@RestController
public class OrderFeignController
{
    @Resource
    private PaymentFeignService paymentFeignService;
 
    @GetMapping(value = "/consumer/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id)
    {
        return paymentFeignService.getPaymentById(id);
    }
}

测试结果 

 http://localhost/consumer/payment/get/31

第一次 

 第二次：

 可以发现已经实现轮询