1.创建父工程

<groupId>com.itheima</groupId>

<artifactId>springboot_security_oauth</artifactId>

<version>1.0-SNAPSHOT</version>

<parent>

 <groupId>org.springframework.boot</groupId>

 <artifactId>spring-boot-starter-parent</artifactId>

 <version>2.1.3.RELEASE</version>

 <relativePath/>

</parent>

<properties>

 <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>

</properties>

<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>

<repositories>

 <repository>

   <id>spring-snapshots</id>

   <name>Spring Snapshots</name>

   <url>https://repo.spring.io/snapshot</url>

   <snapshots>

     <enabled>true</enabled>

   </snapshots>

 </repository>

 <repository>

   <id>spring-milestones</id>

   <name>Spring Milestones</name>

   <url>https://repo.spring.io/milestone</url>

   <snapshots>

     <enabled>false</enabled>

   </snapshots>

 </repository>

</repositories>