POI获取单元格的宽和高

获取单元格的宽，即获取所在列的宽。先获取单元格所在的sheet：cell.getSheet()

sheet.getColumnWidth( cell.getColumnIndex() )  单位不是像素，是1/256个字符宽度
sheet.getColumnWidthInPixels( cell.getColumnIndex() )  单位是像素

获取单元格的高，即获取所在行的高。先获取单元格所在的row：cell.getRow()

row.getHeight()
row.getHeightInPoints()
这两个属性的区别在于HeightInPoints的单位是点，而Height的单位是1/20个点，所以Height的值永远是HeightInPoints的20倍

如果说，我非要获取到单元格行高的像素值，该怎么办呢？俺有个不太精确的方法。

网上有大神总结：
　　EXCEL列高度的单位是磅,Apache POI的行高度单位是缇(twip)
　　DPI = 1英寸内可显示的像素点个数。通常电脑屏幕是96DPI, IPhone4s的屏幕是326DPI, 普通激光黑白打印机是400DPI
　　要计算POI行高或者Excel的行高，就先把它行转换到英寸，再乘小DPI就可以得到像素
　　像素= (Excel的行高度/72)*DPI

所以获取行高的像素值的方法就是： (row.getHeightInPoints() / 72) * 96

四个方法对应的参考文档如下：

前两个，参考文档链接：https://poi.apache.org/apidocs/org/apache/poi/ss/usermodel/Sheet.html

getColumnWidth
    int getColumnWidth(int columnIndex)
    get the width (in units of 1/256th of a character width )
    Character width is defined as the maximum digit width of the numbers 0, 1, 2, ... 9 as rendered using the default font (first font in the workbook)
Parameters:
    columnIndex - - the column to get (0-based)
Returns:
    width - the width in units of 1/256th of a character width

getColumnWidthInPixels
    float getColumnWidthInPixels(int columnIndex)
    get the width in pixel
    Please note, that this method works correctly only for workbooks with the default font size (Arial 10pt for .xls and Calibri 11pt for .xlsx). If the default font is changed the column width can be streched
Parameters:
    columnIndex - - the column to set (0-based)
Returns:
    width in pixels

后两个，参考文档链接：https://poi.apache.org/apidocs/org/apache/poi/ss/usermodel/Row.html

getHeight
short getHeight()
    Get the row's height measured in twips (1/20th of a point). If the height is not set, the default worksheet value is returned, See Sheet.getDefaultRowHeightInPoints()
Returns:
    row height measured in twips (1/20th of a point)

getHeightInPoints
    float getHeightInPoints()
    Returns row height measured in point size. If the height is not set, the default worksheet value is returned, See Sheet.getDefaultRowHeightInPoints()
Returns:
    row height measured in point size
See Also:
    Sheet.getDefaultRowHeightInPoints()

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