pom.xml文件中<parent> 标签报错：

问题：主要是在本地仓库未找到jar包

1. Project build error: Non-resolvable parent POM: Failure to transfer org.springframework.boot:spring-boot-starter-parent:pom:2.2.6.RELEASE from http://repo1.maven.org/maven2 was cached in the
2. local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.springframework.boot:spring-
3. boot-starter-parent:pom:2.2.6.RELEASE from/to central (http://repo1.maven.org/maven2): Failed to transfer http://repo1.maven.org/maven2/org/springframework/boot/spring-boot-starter-parent/
4. 2.2.6.RELEASE/spring-boot-starter-parent-2.2.6.RELEASE.pom. Error code 501, HTTPS Required and 'parent.relativePath' points at no local POM

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处置方案：
在maven的配置文件文件库
在conf文件夹下找到setting.xml文件，在文件的<mirrors>标签下添加以下库：

1.         <!-- 阿里云库 -->
2.          <mirror>     
3.                 <id>alimaven</id>      
4.                 <name>aliyun maven</name>      
5.                 <url>http://maven.aliyun.com/nexus/content/groups/public/</url>      
6.                 <mirrorOf>central</mirrorOf>   
7.         </mirror>  
8.         <!--华为库 -->
9.         <mirror>      
10.                 <id>alimaven</id>      
11.                 <name>aliyun maven</name>      
12.                 <url>http://maven.aliyun.com/nexus/content/groups/public/</url>      
13.                 <mirrorOf>central</mirrorOf>   
14.         </mirror>

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在项目中找到pom.xml文件右键Run us  --> Maven clean或Maven install 下载jar