一起用feign来调用接口（有源码）-阿里云开发者社区

一起用feign来调用接口（有源码）

2022-12-14 114

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简介： nacos很好的兼容了feign，feign默认集成了Ribbon，所以Nacos下使用Feign就默认实现了负载均衡一、测试结果

nacos很好的兼容了feign，feign默认集成了Ribbon，所以Nacos下使用Feign就默认实现了负载均衡

一、测试结果

二、生产者

结构图

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>cn.nacos.provider</groupId>
  <artifactId>nacos-provider</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>nacos-provider</name>
  <description>Demo project for Spring Boot</description>
  <properties>
    <java.version>1.8</java.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <!--nacos依赖-->
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
      <version>2.0.1.RELEASE</version>
    </dependency>
    <!--openfeign依赖-->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
      <version>2.1.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.12</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

application.yml

server:
  port: 8086
spring:
  application:
    name: nacos-provider
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
logging:
  level:
    root: info
    org.springframework: info

NacosProviderApplication

package com.example.nacosprovider;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.SpringApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class NacosProviderApplication {
  public static void main(String[] args) {
    SpringApplication.run(NacosProviderApplication.class, args);
  }
}

NacosProviderController

@RestController
@Slf4j
public class NacosProviderController {
  @GetMapping("/provider")
  public String provider() {
    System.out.println("==================hello");
    return "（provider invoke这里是提供者提供资源）-" + now();
  }
}

三、消费者（重点）

结构图

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>cn.nacos.consumer</groupId>
  <artifactId>nacos-consumer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>nacos-consumer</name>
  <description>Demo project for Spring Boot</description>
  <properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-boot.version>2.1.0.RELEASE</spring-boot.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <!--nacos依赖-->
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
      <version>2.0.1.RELEASE</version>
    </dependency>
    <!--openfeign依赖-->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
      <version>2.1.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.16.10</version>
    </dependency>
    <dependency>
      <groupId>io.swagger</groupId>
      <artifactId>swagger-annotations</artifactId>
      <version>1.5.13</version>
    </dependency>
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.2.0</version>
    </dependency>
  </dependencies>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>${spring-boot.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

application.yml

server:
  port: 8087
spring:
  application:
    name: nacos-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
  #mysql config
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/study_cloud?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false
    username: root
    password: root
  main:
    allow-bean-definition-overriding: true
logging:
  level:
    root: info
    org.springframework: info
mybatis-plus:
  mapper-locations: classpath*:xml
  type-aliases-package: com.example.nacosprovider.entity
nacos-provider: #调用提供者名称
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

NacosConsumerApplication

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients//开启客户端fegin
@ComponentScan("com.example.nacosprovider.*")
public class NacosConsumerApplication {
  public static void main(String[] args) {
    SpringApplication.run(NacosConsumerApplication.class, args);
  }
  @Bean
  @LoadBalanced
  public RestTemplate restTemplate() {
    return new RestTemplate();
  }
}

ConsumerController

@RestController
@Slf4j
public class ConsumerController {
  @Resource
  private ProductService productService;
  @ApiOperation("fegin")
  @GetMapping("/feginLast")
  public String feginLast() {
    String provider = productService.provider();
    return provider;
  }
}

ProductService

@FeignClient(value = "nacos-provider")//调用微服务
public interface ProductService {
  @RequestMapping("/provider")//制定请求的url===nacos-provider/provider
  String provider();
}

一起用feign来调用接口（有源码）

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