如何使用另一个工作簿作为数据源创建Apache POI Pivot？

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.2</version>
</dependency>

Workbook sourceWorkbook = WorkbookFactory.create(new File("path/to/source/workbook.xlsx"));

Sheet sourceSheet = sourceWorkbook.getSheet("Sheet1");

Workbook targetWorkbook = new XSSFWorkbook();
Sheet targetSheet = targetWorkbook.createSheet("Pivot");

for (Row sourceRow : sourceSheet) {
    Row targetRow = targetSheet.createRow(sourceRow.getRowNum());
    for (Cell sourceCell : sourceRow) {
        Cell targetCell = targetRow.createCell(sourceCell.getColumnIndex());
        targetCell.setCellValue(sourceCell.getStringCellValue());
    }
}

AreaReference sourceData = new AreaReference("Pivot!$A$1:$D$10", SpreadsheetVersion.EXCEL2007);
PivotTable pivotTable = targetSheet.createPivotTable(sourceData, new CellReference("A1"));

pivotTable.addRowLabel(0); // 第一列作为行字段
pivotTable.addColumnLabel(DataConsolidateFunction.SUM, 1); // 第二列作为值字段（求和）
pivotTable.addColumnLabel(DataConsolidateFunction.AVERAGE, 2); // 第三列作为值字段（平均值）

targetWorkbook.write(new FileOutputStream("path/to/target/workbook.xlsx"));
targetWorkbook.close();