Apache POI - 有没有办法创建一个数据透视表,其中源表是一个SXSSFSheet?

时间:2018-04-12 17:58:40

标签: java excel apache-poi pivot

情况如此: 我必须使用SXSSFWorkbook(XSSFWorkbook的流式版本)来创建我的Excel,因为我必须创建一个包含大约20列的700000/800000行的工作表。 此工作表代表我最终数据透视表的源表。

SXSSFWorkbook workbook();
XSSFSheet pivotSheet = workbook.getXSSFWorkbook().createSheet("Pivot sheet");
AreaReference ar = ....:
CellReference cr = ....;
XSSFPivotTable pivotTable = pivotSheet.createPivotTable(ar, cr); // ERROR!!

问题在于,当我尝试在该源上创建此Pivot时, XSSFPivotTable.createPivotTable 方法不起作用,尽管AreaReference和CellReference参数都可以。

如果我使用行数较少的XSSFWorkbook(不是流媒体版本),一切都还可以,但我没有达到目标!

有人可以给我一个解决方案吗? 非常感谢!!!!!

斯特凡诺

1 个答案:

答案 0 :(得分:1)

可以从XSSFWorkbook创建

SXSSFWorkbook

所以我要做的是创建XSSFWorkbookXSSFSheet至少包含数据的标题,另一个XSSFSheet用于数据透视表。然后在此XSSFPivotTable上创建XSSFSheet,但对数据表的引用足以支持以后的数据。

然后我会从此SXSSFWorkbook创建XSSFWorkbook,将数据表格设为SXSSFSheet,然后将大量数据流式传输到数据表中。

完整示例:

import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
import org.apache.poi.ss.SpreadsheetVersion;

import org.apache.poi.xssf.streaming.*;

import java.util.Random;
import java.io.FileOutputStream;

class SXSSFPivotTableTest {

 private static void streamCellData(Sheet sheet, int rowsCount) {

  for (int r = 1; r <= rowsCount; r++) {
   Row row = sheet.createRow(r);
   Cell cell = row.createCell(0);
   cell.setCellValue("Name " + ((r-1) % 4 + 1));
   cell = row.createCell(1);
   cell.setCellValue(r * new java.util.Random().nextDouble());
   cell = row.createCell(2);
   cell.setCellValue(r * new java.util.Random().nextDouble());
   cell = row.createCell(3);
   cell.setCellValue("City " + ((r-1) % 3 + 1));  
  }

 }

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

  int rowsCount = 1000000;

  //first create XSSFWorkbook
  XSSFWorkbook wb = new XSSFWorkbook();

  //create XSSFSheet with at least the headings
  XSSFSheet sheet = wb.createSheet("Sheet1");
  Row row = sheet.createRow(0);
  Cell cell = row.createCell(0);
  cell.setCellValue("Name");
  cell = row.createCell(1);
  cell.setCellValue("Value1");
  cell = row.createCell(2);
  cell.setCellValue("Value2");
  cell = row.createCell(3);
  cell.setCellValue("City");

  //create XSSFSheet for pivot table
  XSSFSheet pivotSheet = wb.createSheet("Pivot sheet");

  //create pivot table
  XSSFPivotTable pivotTable = pivotSheet.createPivotTable(
    new AreaReference(new CellReference("Sheet1!A1"), 
                      new CellReference("Sheet1!D" + (rowsCount +1)), //make the reference big enough for later data
                      SpreadsheetVersion.EXCEL2007),
    new CellReference("A5"));
  //Configure the pivot table
  //Use first column as row label
  pivotTable.addRowLabel(0);
  //Sum up the second column
  pivotTable.addColumnLabel(DataConsolidateFunction.SUM, 1);
  //Avarage the third column
  pivotTable.addColumnLabel(DataConsolidateFunction.AVERAGE, 2);
  //Add filter on forth column
  pivotTable.addReportFilter(3);

  //now create SXSSFWorkbook from XSSFWorkbook
  SXSSFWorkbook swb = new SXSSFWorkbook(wb);
  SXSSFSheet ssheet = swb.getSheet("Sheet1");

  //now stream the big amount of data to build the pivot table on into Sheet1
  streamCellData(ssheet, rowsCount);

  swb.write(new FileOutputStream("SXSSFPivotTableTest.xlsx"));
  swb.close();
  swb.dispose();

 }
}