Apache POI for Excel: Setting the cell type to “text” for an entire column

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无人共我
无人共我 2021-02-20 17:37

I need to generate an .xls (Excel) file, using the Java library Apache POI for spreadsheets.

The file will contain a list of phone numbers in column A, formatted as \"02

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  • 2021-02-20 17:41

    Vlad: This got most of the problem done. I found that all the empty rows were formatted the way I wanted them. However rows where I had initial zeros looked and worked fine; however if I had to change a pre-existing value with another value starting with zero the zeroes disappeared. So I recommend adding code to when you create the value in the cell to reset the the setCellStyle to text. here are some snippets: method public Cell createCell(Row r!, BBjNumber cell, BBjString value!)

    c!=#this!.createCell(r!, cell)
    c!.setCellValue(value!)
    c!.setCellStyle(#text_format!)
    

    methodret c!

    #text_format! = #wb!.createCellStyle()
    #text_format!.setDataFormat(#format!.getFormat("@"))
    

    methodend

    this may help some other sole searching for initial zeroes. Thank you for posting. Alex

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  • 2021-02-20 17:50

    Here's some example code inspired by Vlad's answer:

    DataFormat fmt = workbook.createDataFormat();
    CellStyle textStyle = workbook.createCellStyle();
    textStyle.setDataFormat(fmt.getFormat("@"));
    worksheet.setDefaultColumnStyle(0, textStyle);
    

    The above code sets the default style for the first column of worksheet to TEXT.

    Thanks, Vlad!

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  • 2021-02-20 17:52

    A better way to set it now using POI is to use the BuiltinFormats class.

    Eg:

    To convert the column type to numeric

     CellStyle numericStyle = workbook.createCellStyle(); 
     numericStyle.setDataFormat(BuiltinFormats.getBuiltinFormat(2)); // 2 For Number 
     worksheet.setDefaultColumnStyle(colId, numericStyle);
    

    The complete list of BuiltinFormats formats can be seen, here

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  • 2021-02-20 18:01

    Will this help?

    By creating a data format with the @ symbol and using that in a CellStyle object that is then passed to the setDefaultColumnStyle() method, it was possible to set the default data type of the column to, in this case, text. I have not experiemented further but do suspect it would be possible to do something similar with other style objects to set the default type to numeric or even a customised format such as currency.

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