java - 在工作表中添加大量ValidationData时，POI写入损坏的.xlsx

我想在JAVA中使用POI编写一个大的.xlsx文件（5万行）。我希望每一行都包含多个下拉单元格。当行数少于30K时，代码可以正常工作；但如果行数超过35K，则写入损坏的文件。

我尝试了SXSSFWorkbook和XSSFWorkbook，但是没有一个对我有用。

这是代码：

        SXSSFWorkbook workbook = new SXSSFWorkbook(100);
        SXSSFSheet sheet = workbook.createSheet();
        String[] optionsArray = new String[] {"1000.00","2000.00"};
        int no_of_rows = 35000;
        for(int i=0;i<=no_of_rows;i++) {
            SXSSFRow row1 = sheet.createRow(i);
            SXSSFCell r1c1 = row1.createCell(0);
            DataValidationConstraint  constraint1 = sheet.getDataValidationHelper().createExplicitListConstraint(optionsArray);
            CellRangeAddressList addressList1 = new CellRangeAddressList(i, i, 0, 0);
            DataValidation dataValidation1 = sheet.getDataValidationHelper().createValidation(constraint1, addressList1);
            sheet.addValidationData(dataValidation1);
            r1c1.setCellValue("1000.00");

            SXSSFCell r1c2 = row1.createCell(1);
            DataValidationConstraint  constraint2 = sheet.getDataValidationHelper().createExplicitListConstraint(optionsArray);
            CellRangeAddressList addressList2 = new CellRangeAddressList(i, i, 1, 1);
            DataValidation dataValidation2 = sheet.getDataValidationHelper().createValidation(constraint2, addressList2);
            sheet.addValidationData(dataValidation2);
            r1c2.setCellValue("2000.00");
        }
        FileOutputStream fos =new FileOutputStream(new File("c:\\data\\testout.xlsx"));
        workbook.write(fos);
        workbook.close();
        fos.close();

我希望POI至少可以处理5万行此类数据。

最佳答案

不要为每个单元格创建一个DataValidation。而是仅创建两个所需的数据验证，一个验证为A1:A50001，第二个验证为B1:B50001。为此，CellRangeAddressList可以包含整个列范围：

CellRangeAddressList addressList1 = new CellRangeAddressList(0, no_of_rows, 0, 0);

和

CellRangeAddressList addressList1 = new CellRangeAddressList(0, no_of_rows, 1, 1);

你的例子：

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.ss.util.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.*;

class CreateSXSSFWorkbookDataValidations {

    public static void main(String[] args) throws Exception {

        SXSSFWorkbook workbook = new SXSSFWorkbook(100);
        SXSSFSheet sheet = workbook.createSheet();

        String[] optionsArray = new String[] {"1000.00","2000.00"};

        int no_of_rows = 50000;

        for(int i=0;i<=no_of_rows;i++) {
            SXSSFRow row1 = sheet.createRow(i);
            SXSSFCell r1c1 = row1.createCell(0);
            r1c1.setCellValue("1000.00");
            SXSSFCell r1c2 = row1.createCell(1);
            r1c2.setCellValue("2000.00");
        }

        DataValidationConstraint constraint1 = sheet.getDataValidationHelper().createExplicitListConstraint(optionsArray);
        CellRangeAddressList addressList1 = new CellRangeAddressList(0, no_of_rows, 0, 0);
        DataValidation dataValidation1 = sheet.getDataValidationHelper().createValidation(constraint1, addressList1);
        sheet.addValidationData(dataValidation1);

        DataValidationConstraint constraint2 = sheet.getDataValidationHelper().createExplicitListConstraint(optionsArray);
        CellRangeAddressList addressList2 = new CellRangeAddressList(0, no_of_rows, 1, 1);
        DataValidation dataValidation2 = sheet.getDataValidationHelper().createValidation(constraint2, addressList2);
        sheet.addValidationData(dataValidation2);

        FileOutputStream fos = new FileOutputStream(new File("testout.xlsx"));
        workbook.write(fos);
        workbook.close();
        fos.close();


    }
}

当不同唯一数据验证的计数超过限制时，不可能对每个单电池进行不同的唯一数据验证。此限制是Excel限制，而不是apache poi限制。

Excel specifications and limits中没有记录此数据验证的特殊限制。但这可能与唯一单元格格式/单元格样式的限制（64,000）或工作表中超链接的限制（66,530）有关。

关于java - 在工作表中添加大量ValidationData时，POI写入损坏的.xlsx，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/56865788/