Java

Question

有什么方法可以将字符串转换为数字吗？我一直在尝试对 apache poi 使用条件格式规则，但我不能这样做，因为 excel 文件有数字，但作为字符串，规则不起作用。这是代码：

public class 条件格式 {

public static void main(String[] args) throws IOException {
    String excelFilePath = "Excel.xlsx";
    FileInputStream inputStream = new FileInputStream(new File(excelFilePath));
     
    Workbook workbook = new XSSFWorkbook(inputStream);
    Sheet firstSheet = workbook.getSheetAt(0);
    Iterator<Row> iterator = firstSheet.iterator();
     
    while (iterator.hasNext()) {
        Row nextRow = iterator.next();
        Iterator<Cell> cellIterator = nextRow.cellIterator();
        firstSheet.setColumnHidden(4, true);
         
        while (cellIterator.hasNext()) {
            Cell cell = cellIterator.next();
          
            switch (cell.getCellType()) {
                case Cell.CELL_TYPE_STRING:
                    System.out.print(cell.getStringCellValue());
                    break;
                case Cell.CELL_TYPE_BOOLEAN:
                    System.out.print(cell.getBooleanCellValue());
                    break;
                case Cell.CELL_TYPE_NUMERIC:
                    System.out.print(cell.getNumericCellValue());
                    break;
            }
            
            System.out.print(" - ");
        }
        System.out.println();
    }
    
            /* Access conditional formatting facet layer */
            SheetConditionalFormatting my_cond_format_layer = firstSheet.getSheetConditionalFormatting();
            
            /* Rule */
            ConditionalFormattingRule my_rule = my_cond_format_layer.createConditionalFormattingRule(ComparisonOperator.EQUAL, "5.00");
            
            /* RED color */
            FontFormatting my_rule_pattern = my_rule.createFontFormatting();
            my_rule_pattern.setFontColorIndex(IndexedColors.RED.getIndex());
            
            /* background Yellow */
            PatternFormatting fill_pattern = my_rule.createPatternFormatting();
            fill_pattern.setFillBackgroundColor(IndexedColors.YELLOW.index);
             
             /* Cell Range Address */
            CellRangeAddress[] my_data_range = {CellRangeAddress.valueOf("F1:F15")};
            
            /* Attach rule to cell range */
            my_cond_format_layer.addConditionalFormatting(my_data_range,my_rule);
    
    inputStream.close();
    FileOutputStream fileOut = new FileOutputStream("file.xlsx");
    workbook.write(fileOut);
    fileOut.close();
    System.out.println("Successfully Created workbook");
}

}

Answer 1

“excel 文件有数字但为字符串”：应该避免这种情况而不是解决此问题。将 Excel 中的数字作为字符串存储将导致使用电子表格计算时出现多个问题，而不仅仅是使用条件格式。

解决方法是

ConditionalFormattingRule my_rule = my_cond_format_layer.createConditionalFormattingRule("VALUE(F1)=5.00");

这使用公式条件格式规则而不是直接比较单元格是否相等。该公式使用 Excel 的 VALUE 函数始终从单元格中获取数值。

Java - 条件格式 - 将单元格设置为数字

Java - Conditional Formatting - Set cell as numeric

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apache-poi