java excel 多个单元格下拉框级联 通用代码具体实现

实现多个单元格下拉框级联最常见的方式是使用数据验证和VLOOKUP函数。以下是一个通用的Java代码实现示例：

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileOutputStream;
import java.io.IOException;

public class ExcelDropdownCascadeExample {

    public static void main(String[] args) throws IOException {
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("Sheet1");

        // 第一列下拉框数据
        String[] column1Values = new String[]{"A1", "A2", "A3", "A4"};
        // 第一列数据验证
        DataValidationHelper validationHelper = sheet.getDataValidationHelper();
        CellRangeAddressList column1RangeAddressList = new CellRangeAddressList(1, 100, 0, 0);
        DataValidationConstraint column1Constraint = validationHelper.createExplicitListConstraint(column1Values);
        DataValidation column1Validation = validationHelper.createValidation(column1Constraint, column1RangeAddressList);
        sheet.addValidationData(column1Validation);

        // 第二列下拉框数据
        String[] column2ValuesA1 = new String[]{"B1", "B2", "B3"};
        String[] column2ValuesA2 = new String[]{"C1", "C2", "C3"};
        String[] column2ValuesA3 = new String[]{"D1", "D2", "D3"};
        String[] column2ValuesA4 = new String[]{"E1", "E2", "E3"};

        // 第二列数据验证
        CellRangeAddressList column2RangeAddressList = new CellRangeAddressList(1, 100, 1, 1);
        DataValidationConstraint column2Constraint = validationHelper.createFormulaListConstraint("INDIRECT($A1&\"_values\")");
        DataValidation column2Validation = validationHelper.createValidation(column2Constraint, column2RangeAddressList);
        sheet.addValidationData(column2Validation);

        // 第一列对应的下拉框数据
        Name column2ValuesA1Name = workbook.createName();
        column2ValuesA1Name.setNameName("A1_values");
        column2ValuesA1Name.setRefersToFormula("Sheet1!$G$1:$G$3");
        sheet.createRow(0).createCell(6).setCellValue(column2ValuesA1[0]);
        sheet.createRow(1).createCell(6).setCellValue(column2ValuesA1[1]);
        sheet.createRow(2).createCell(6).setCellValue(column2ValuesA1[2]);

        Name column2ValuesA2Name = workbook.createName();
        column2ValuesA2Name.setNameName("A2_values");
        column2ValuesA2Name.setRefersToFormula("Sheet1!$H$1:$H$3");
        sheet.createRow(0).createCell(7).setCellValue(column2ValuesA2[0]);
        sheet.createRow(1).createCell(7).setCellValue(column2ValuesA2[1]);
        sheet.createRow(2).createCell(7).setCellValue(column2ValuesA2[2]);

        Name column2ValuesA3Name = workbook.createName();
        column2ValuesA3Name.setNameName("A3_values");
        column2ValuesA3Name.setRefersToFormula("Sheet1!$I$1:$I$3");
        sheet.createRow(0).createCell(8).setCellValue(column2ValuesA3[0]);
        sheet.createRow(1).createCell(8).setCellValue(column2ValuesA3[1]);
        sheet.createRow(2).createCell(8).setCellValue(column2ValuesA3[2]);

        Name column2ValuesA4Name = workbook.createName();
        column2ValuesA4Name.setNameName("A4_values");
        column2ValuesA4Name.setRefersToFormula("Sheet1!$J$1:$J$3");
        sheet.createRow(0).createCell(9).setCellValue(column2ValuesA4[0]);
        sheet.createRow(1).createCell(9).setCellValue(column2ValuesA4[1]);
        sheet.createRow(2).createCell(9).setCellValue(column2ValuesA4[2]);

        FileOutputStream outputStream = new FileOutputStream("example.xlsx");
        workbook.write(outputStream);
        workbook.close();
    }
}

在这个示例中，我们使用了Apache POI库来创建一个Excel文档，并在第一列添加了一个下拉框，用于选择A1，A2，A3或A4。在第二列中，我们使用了VLOOKUP函数来根据第一列的选择动态更新下拉框数据。我们还使用了命名区域来定义每个下拉框的数据范围。

请注意，这个示例中的代码仅仅是一个通用的实现，真正的实现可能会因为具体的业务需求而有所不同。