Maven更新jdk1.7

<profile>
    <id>jdk17</id>
    <activation>
      <activeByDefault>true</activeByDefault>
      <jdk>1.7</jdk>
    </activation>
    <properties>
      <maven.compiler.source>1.7</maven.compiler.source>
      <maven.compiler.target>1.7</maven.compiler.target>
      <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>
    </properties>
    </profile>