使用 POI 根据单元格公式结果设置单元格样式

Question

我需要一些关于根据单元格值设置单元格样式的帮助。

用于填充单元格的代码。

String totalvariationweightv1 = "J" + (x+1);
String totalvariationweightv2 = "L" + (x+1);
cell85014.setCellType(Cell.CELL_TYPE_FORMULA);
cell85014.setCellFormula("SUM(((" + totalvariationweightv2 + "-" + totalvariationweightv1 + ")/" + totalvariationweightv1 + ")*100)");

然后如果它超过某个值，我需要给字段着色。现在我只有交替的颜色：

cell85014.setCellStyle((x%2)==0?stylefloatGray:stylefloat);

我不知道如何获取单元格值。使用 getNumericValue returns 0。

Answer 1

Apache POI 存储公式，但它 doesn't evaluate it automatically。

The Excel file format (both .xls and .xlsx) stores a "cached" result for every formula along with the formula itself. This means that when the file is opened, it can be quickly displayed, without needing to spend a long time calculating all of the formula results. It also means that when reading a file through Apache POI, the result is quickly available to you too!

After making changes with Apache POI to either Formula Cells themselves, or those that they depend on, you should normally perform a Formula Evaluation to have these "cached" results updated. This is normally done after all changes have been performed, but before you write the file out.

您必须告诉 Apache POI 单独计算公式。

FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();

// Set your cell formula here

switch (evaluator.evaluateFormulaCell(cell85014)) {
    case Cell.CELL_TYPE_NUMERIC:
        double x = cell85014.getNumericCellValue();
        // Set cell style here, based on numeric value,
        // as you already are doing in your code.
        // Watch out for floating point inaccuracies!
        break;
    default:
        System.err.println("Unexpected result type!");
        break;
}

使用 POI 根据单元格公式结果设置单元格样式

Using POI Set Cell Style Based on Cell Formula Result

java

apache-poi