POI操作Excel表格问题:org.apache.poi.util.POILogger.log(ILjava/lang/Object;)V

ref :https://blog.csdn.net/u013361445/article/details/50491815

1、报错问题：

    Exception in thread "main" java.lang.IllegalAccessError: tried to access method org.apache.poi.util.POILogger.log(ILjava/lang/Object;)V from class org.apache.poi.openxml4j.opc.PackageRelationshipCollection  

解决方案： 保持各个jar包版本一致

    <dependency>  
        <groupId>org.apache.poi</groupId>  
        <artifactId>poi-ooxml</artifactId>  
        <version>3.17</version>  
    </dependency>  
    <dependency>  
        <groupId>org.apache.poi</groupId>  
        <artifactId>poi-ooxml-schemas</artifactId>  
        <version>3.17</version>  
    </dependency>  
    <dependency>  
        <groupId>org.apache.poi</groupId>  
        <artifactId>poi</artifactId>  
        <version>3.17</version>  
    </dependency>  

2.XSSFColor 获取为null
解决方案：保证接口都是同一类型，比如不允许XSSF乱入HSSF