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
答案 0 :(得分:1)
XSSFWorkbook
创建
所以我要做的是创建XSSFWorkbook
,XSSFSheet
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();
}
}