maven setting.xml配置，修改为阿里云镜像

maven setting.xml配置

1 mirrors添加阿里云镜像

 <mirrors>
   <mirror>
     <id>alimaven</id>
     <name>aliyun maven</name>
     <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
     <mirrorOf>central</mirrorOf>
   </mirror>
 </mirrors>

2 profiles添加，设置jdk1.8编译

<profiles>
    <profile>
      <id>jdk-1.8</id>
      <activation>
        <jdk>1.8</jdk>
      </activation>
      <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
      </properties>
    </profile>
</proflies>