[Java]Spring Boot變Spring Cloud

• 部署Consul服務

docker run --name consul -p xxxx:xxxx -v /tmp/consul/conf/:/consul/conf/ -v /tmp/consul/data/:/consul/data/ -d consul

• 於pom.xml設定Spring Cloud parent

<parent>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-parent</artifactId>
  <version>Greenwich.SR1</version>
  <relativePath/>
</parent>

• 於pom.xml設定Spring Cloud dependency

<!--微服務健康性檢查-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--Consul-->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-consul-discovery</artifactId>
</dependency>
<!--Hystrix的服務限流熔斷-->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<!--Spring Cloud-->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-commons</artifactId>
</dependency>

• 建立bootstrap.yml

spring:
  application:
    name: user
  profiles:
    active: debug
  cloud:
    consul:
      host: 127.0.0.1
      port: 8500
      discovery:
        preferIpAddress: true
        instance-id: ${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}}:@project.version@
        healthCheckPath: /actuator/health
server:
  port: 9090

設定應用名稱、通訊資訊與註冊Consul服務的相關資訊。

• 於pom.xml設定Maven

<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
  </plugins>

  <resources>
    <resource>
      <directory>${basedir}/src/main/resources</directory>
      <filtering>true</filtering>
      <includes>
        <include>**/application*.yml</include>
        <include>**/application*.yaml</include>
        <include>**/bootstrap.yml</include>
        <include>**/bootstrap.yaml</include>
      </includes>
    </resource>
  </resources>
</build>

spring boot會預先載入application.yml，但不會載入bootstrap.yml，做了上述設定後，就會載入bootstrap.yml。

• 於main上，加入底下代碼

@EnableDiscoveryClient

會引入spring-cloud-starter-consul-discovery，並將為服務註冊到consul。