springcloud之服务消费者（ribbon + restTemplate）

1.pom.xml配置

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.boomsecret</groupId>
    <artifactId>consumer-ribbon-9300</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>consumer-ribbon-9300</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <finalName>consumer-ribbon</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

springboot版本为2.0.3.RELEASE
springcloud版本为Finchley.RELEASE

2.application.yml配置

server:
  port: 9300

spring:
  application:
    name: consumer-ribbon

eureka:
  client:
    serviceUrl:
      defaultZone: http://eureka.com:9100/eureka/

defaultZone为注册中心地址

3.ConsumerRibbon9300Application.java

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class ConsumerRibbon9300Application {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerRibbon9300Application.class, args);
    }
}

4.RestTemplate配置

@Configuration
public class CommonConfig {
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

5.RestTemplate调用

@RestController
public class TestController {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("/test")
    public String test() {
        return restTemplate.getForObject("http://PROVIDER/test", String.class);
    }
}

6.总结

ribbon起到负载均衡的作用

源码地址：https://gitee.com/jsjack_wang/springcloud-demo-all