同一项目启动多个实例

pom.xml

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勾选Allow parallel run

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ribbon

<?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>com.com</groupId>
    <artifactId>rib</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>rib</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR5</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</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>
    </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>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

yml文件与服务端类似

spring:
  application:
    name: rib
server:
  port: 8764
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8081/eureka/

RibApplication
加上@EnableDiscoveryClient

@SpringBootApplication
@EnableDiscoveryClient
public class RibApplication {

    public static void main(String[] args) {
        SpringApplication.run(RibApplication.class, args);
    }

}

创建config包
下创建RestTemplateConfiguration

@Configuration
public class RestTemplateConfiguration {

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

创建service
用服务端的spring-application-name访问

@Service
public class ClientService {

    @Autowired
    private RestTemplate restTemplate;

    public String sayHi(String message) {
        System.out.println(message);
                                        //client是服务的spring-application-name
        return restTemplate.getForObject("http://client/hi?message="+message,String.class);
    }
}

创建controller

@RestController
public class RibController {
    @Autowired
    private ClientService clientService;

    @RequestMapping(value = "hi",method = RequestMethod.GET)
    public String sayHi(String message) {
        return clientService.sayHi(message);
    }
}

用
http://localhost:8764/hi?message=hello
访问rib