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Today, I would like to share with you how Java exports Excel to add drop-down box options related to knowledge, detailed content, clear logic, I believe that most people still know too much about this knowledge, so share this article for your reference, I hope you will learn something after reading this article, let's take a look at it.

Excel for more options in the drop-down box, you need to use a hidden workbook to solve the problem, and use function values to do the options.

Fewer options (generally less than 5):

Private static DataValidation setFewDataValidation (Sheet sheet, String [] textList, int firstRow, int endRow, int firstCol, int endCol) {DataValidationHelper helper = sheet.getDataValidationHelper (); / / load the contents of the drop-down list DataValidationConstraint constraint = helper.createExplicitListConstraint (textList); constraint.setExplicitListValues (textList); / / sets the cell in which the data validity is loaded. The four parameters are: start row, end row, start column, stop column CellRangeAddressList regions = new CellRangeAddressList ((short) firstRow, (short) endRow, (short) firstCol, (short) endCol); / / data validity object return helper.createValidation (constraint, regions);}

There are many options

Create a hidden workbook:

Sheet sheetHidden = wb.createSheet ("Sheet2"); wb.setSheetHidden (1, true)

Each list occupies one column

Of course, you can also use one workbook per list, using only the first column. Here is to use a workbook to use each column, with the first 26 letters, which is generally enough

String [] arr = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y" "Z"} For (int j = 0; j < dataList.size (); jacks +) {if (index = = 0) {/ / first drop-down option to directly create rows and columns row = sheetHidden.createRow (j); / create data rows / / sheetHidden.setColumnWidth (j, 4000); / / set column width row.createCell (0) .setCellValue (dataList.get (j)) / / set the value of the corresponding cell} else {/ / not the first drop-down option int rowCount = sheetHidden.getLastRowNum (); if (j

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