maven 设置编译版本为java8 设置字符集为utf8

<project>

    ...

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <project.build.sourceEncoding>utf-8</project.build.sourceEncoding>
    </properties>

    ...

</project>

参考：

1. maven 官方文档《Setting the -source and -target of the Java Compiler》：https://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html