第一步：打开settings.xml

image-20220814093029711

第二步：在settings.xml中添加如下代码

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<profiles>
        <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>
 </profiles>