多线程实现千万数据的excel导出 java代码

可以使用Apache POI库来实现多线程的千万数据的Excel导出，具体实现可以参考以下代码：

public class ExcelExporter implements Runnable {
    private int startRow;
    private int endRow;
    private String fileName;

    public ExcelExporter(int startRow, int endRow, String fileName) {
        this.startRow = startRow;
        this.endRow = endRow;
        this.fileName = fileName;
    }

    @Override
    public void run() {
        try {
            Workbook workbook = new XSSFWorkbook();
            Sheet sheet = workbook.createSheet("Sheet1");

            // 创建表头
            Row headerRow = sheet.createRow();
            for (int i = ; i < headers.length; i++) {
                Cell cell = headerRow.createCell(i);
                cell.setCellValue(headers[i]);
            }

            // 填充数据
            for (int i = startRow; i <= endRow; i++) {
                Row row = sheet.createRow(i - startRow + 1);
                for (int j = ; j < data[i].length; j++) {
                    Cell cell = row.createCell(j);
                    cell.setCellValue(data[i][j]);
                }
            }

            // 导出Excel文件
            FileOutputStream outputStream = new FileOutputStream(fileName);
            workbook.write(outputStream);
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

// 创建线程池
ExecutorService executorService = Executors.newFixedThreadPool(10);

// 分批导出Excel文件
int batchSize = 100000;
for (int i = ; i < data.length; i += batchSize) {
    int startRow = i;
    int endRow = Math.min(i + batchSize - 1, data.length - 1);
    String fileName = "data_" + startRow + "_" + endRow + ".xlsx";
    executorService.execute(new ExcelExporter(startRow, endRow, fileName));
}

// 关闭线程池
executorService.shutdown();
while (!executorService.isTerminated()) {
    Thread.sleep(100);
}