maven的setting.xml文件配置

配置阿里源仓库并配置jdk8编译。

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

  <profiles>
         <profile>    
            <id>jdk8</id>    
            <activation>    
               <activeByDefault>true</activeByDefault>    
               <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>
  </profiles>

  <activeProfiles>
        <activeProfile>jdk8</activeProfile>
  </activeProfiles>