Spring Cloud Tutorial - 2

In this series of previous article, we practiced how to build a registration and discovery service. Now, we are going to practice registering a business service.

In this experiment, we use an example built on Spring Boot to serve as a developed business segment. For example construction, please refer to Spring Boot 构建Rest服务实验手册(一)

To use the Spring Boot application as a registerable service of Spring Cloud, you only need to simply change the following three places in the project:

Add dependency library

In the project’s pom.xml file:

1. Change the version number of the project’s parent element spring-boot-starter-parent to: 2.0.5.RELEASE, the modified version is as follows:

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>2.0.5.RELEASE</version>
	<relativePath/> 
</parent>

2. Add the following dependency libraries and dependency management items:

  <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-actuator</artifactId>
</dependency>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Finchley.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

Modify the startup class

Add @EnableEurekaClient annotation to the startup class of Spring Boot application, the code is as follows:

@EnableEurekaClient
@SpringBootApplication
public class TodoServiceApplication {

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

Delete test class

Delete the test class in the test/java directory.

Modify the application.yaml configuration file

Add the following content in the project configuration file: application.yaml:

spring:
  application:
    name: cloud-simple-service

eureka:
  instance:
    leaseRenewalIntervalInSeconds: 1
    leaseExpirationDurationInSeconds: 2
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
    healthcheck:
      enabled: true
    lease:
      duration: 5

Start the program and verify

Start the application and visit the registration server to see if the current application has been registered:

http://localhost:8761

Next

In next step, we will practice a Gateway in Spring Cloud.