apache poi获取默认列类型

Question

I'm using POI to create a new row of cells in an existing spreadsheet. POI allows you to get the column default style, but there's no equivalent (as near as I can tell) to getting a default type. I'm getting a String from my user interface and I don't know how to set the cell type. If the string is a double, then fine, it's NUMERIC. But if the String specifies a date, how would I best detect it so that it is also set to NUMERIC? There are some many formatting types for a date that it is impractical to detect the type from the cell style format. Does POI support a way to parse based on a format?

Answer 1

To set the cell type you use:

setCellType()

as outlined in the docs:

https://poi.apache.org/apidocs/

setCellType void setCellType(int cellType) Set the cells type (numeric, formula or string). If the cell currently contains a value, the value will be converted to match the new type, if possible. Formatting is generally lost in the process however.

If what you want to do is get a String value for your numeric cell, stop!. This is not the way to do it. Instead, for fetching the string value of a numeric or boolean or date cell, use DataFormatter instead.

Throws: java.lang.IllegalArgumentException - if the specified cell type is invalid java.lang.IllegalStateException - if the current value cannot be converted to the new type See Also: CELL_TYPE_NUMERIC, CELL_TYPE_STRING, CELL_TYPE_FORMULA, CELL_TYPE_BLANK, CELL_TYPE_BOOLEAN, CELL_TYPE_ERROR