idea编码问题

maven打包编译时后台一直输出警告信息
编码GBK的不可映射字符
或者
[WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
找了半天，原来只要在pom.xml文件<project>中增加一个配置项即可

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>