eclipse maven插件配置，jdk全局版本调整

settings.xml

</profiles>标签前追加：

<profile>
      <id>jdk-1.7</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>
          <maven.compiler.encoding>utf-8</maven.compiler.encoding>
      </properties>
    </profile>