maven之jre默认配置

    <profile>  
     <id>jdk-1.8</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>