无法使用包'xlsx'来创建Workbook()
R--3.4.4 Windows 7
wb<-createWorkbook()
Error in .jnew("org/apache/poi/xssf/usermodel/XSSFWorkbook") :
Java Exception
(no description because toString() failed).jnew("org/apache/poi/xssf/usermodel/XSSFWorkbook")<S4 object of class "jobjRef">