maven的conf\setting.xml文件中找到jdk注释的地方，打开修改即可，如下


<?xml version="1.0" encoding="UTF-8"?>

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">

    <localRepository>
        D:\maven\repository
    </localRepository>
    <profiles>
        <profile>
            <id>jdk-1.7</id>

            <activation>
                <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>
    </profiles>
</settings>