使用 Apache POI 更改 Excel 折线图中的数据范围

Question

我正在尝试查看是否可以使用 Apache POI 更改折线图中系列的数据范围。

我能够从图表本身中提取系列，但找不到允许我更改数据范围的方法。

XSSFWorkbook workbook = new XSSFWorkbook("C:\Workbook.xlsx");
Sheet worksheet = workbook.getSheetAt(0);
XSSFDrawing drawing = (XSSFDrawing) worksheet.createDrawingPatriarch();
List<XSSFChart> charts = drawing.getCharts();
for (XSSFChart chart : charts) {
    String title = chart.getTitleText().toString();
    if (title.equals("Z-Acceleration")) {
        CTChart cc = chart.getCTChart();
        CTPlotArea plotArea = cc.getPlotArea();
        CTLineSer[] ccc = plotArea.getLineChartArray()[0].getSerArray();
        for (CTLineSer s : ccc) {
            System.out.println(s.xmlText());
        }
        System.out.println(ccc.length);
    }
}

我打印了 XML 文本，看看它是否确实能够正确地从图表中提取系列，并且能够找到它的标题和数据范围，但无法更改它。

Answer 1

好的，既然这是个好问题，让我们举一个具体的例子来说明如何使用 apache poi.

更改 Excel 折线图中的数据范围

让我们从以下内容开始 sheet:

然后是下面的代码：

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

import org.openxmlformats.schemas.drawingml.x2006.chart.*;

import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.util.List;

class ExcelChangeChartDataSource {

 static XSSFChart getChartWithTitle(XSSFSheet sheet, String wantedTitle) {
  if (sheet == null || wantedTitle == null) return null;
  XSSFDrawing drawing = sheet.createDrawingPatriarch();
  List<XSSFChart> charts = drawing.getCharts();
  for (XSSFChart chart : charts) {
   String title = chart.getTitleText().toString();
   if (wantedTitle.equals(title)) return chart;
  }
  return null;
 }

 static void addMonthDataToChart(XSSFSheet sheet, XSSFChart chart, String month, Double[] seriesData) {
  CTChart ctChart = chart.getCTChart();
  CTPlotArea ctPlotArea = ctChart.getPlotArea();
  List<CTLineSer> ctLineSerList = ctPlotArea.getLineChartArray(0).getSerList();

  Row row;
  Cell cell;
  int ser = 0;
  for (CTLineSer ctLineSer : ctLineSerList) {

   CTAxDataSource cttAxDataSource = ctLineSer.getCat();
   CTStrRef ctStrRef = cttAxDataSource.getStrRef();

   AreaReference catReference = new AreaReference(ctStrRef.getF(), SpreadsheetVersion.EXCEL2007);
   CellReference firstCatCell = catReference.getFirstCell();
   CellReference lastCatCell = catReference.getLastCell();
   if (firstCatCell.getCol() == lastCatCell.getCol()) {
    int col = firstCatCell.getCol();
    int lastRow = lastCatCell.getRow();
    row = sheet.getRow(lastRow+1); if (row == null) row = sheet.createRow(lastRow+1);
    cell = row.getCell(col); if (cell == null) cell = row.createCell(col);
    cell.setCellValue(month);

    ctStrRef.setF(new AreaReference(
                  firstCatCell, 
                  new CellReference(lastCatCell.getSheetName(), lastRow+1, col, true, true), 
                  SpreadsheetVersion.EXCEL2007).formatAsString()
                 );

    CTNumDataSource ctNumDataSource = ctLineSer.getVal();
    CTNumRef ctNumRef = ctNumDataSource.getNumRef();

    AreaReference numReference = new AreaReference(ctNumRef.getF(), SpreadsheetVersion.EXCEL2007);
    CellReference firstNumCell = numReference.getFirstCell();
    CellReference lastNumCell = numReference.getLastCell();
    if (lastNumCell.getRow() == lastRow && firstNumCell.getCol() == lastNumCell.getCol()) {
     col = firstNumCell.getCol();
     row = sheet.getRow(lastRow+1); if (row == null) row = sheet.createRow(lastRow+1);
     cell = row.getCell(col); if (cell == null) cell = row.createCell(col);
     if (ser < seriesData.length) cell.setCellValue(seriesData[ser]);

     ctNumRef.setF(new AreaReference(
                   firstNumCell, 
                   new CellReference(lastNumCell.getSheetName(), lastRow+1, col, true, true), 
                   SpreadsheetVersion.EXCEL2007).formatAsString()
                  );
    }
   }
   ser++;
  }
 }

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

  XSSFWorkbook workbook = (XSSFWorkbook)WorkbookFactory.create(new FileInputStream("WorkbookWithChart.xlsx"));

  XSSFSheet sheet = workbook.getSheetAt(0);

  XSSFChart chart = getChartWithTitle(sheet, "Z-Acceleration"); 

  if (chart != null) {
   addMonthDataToChart(sheet, chart, "Apr", new Double[]{7d,3d,5d});
   addMonthDataToChart(sheet, chart, "Mai", new Double[]{2d,6d,8d});
   addMonthDataToChart(sheet, chart, "Jun", new Double[]{1d,9d,4d});
   addMonthDataToChart(sheet, chart, "Jul", new Double[]{5d,6d});
  }

  FileOutputStream out = new FileOutputStream("WorkbookWithChartNew.xlsx");
  workbook.write(out);
  out.close();
  workbook.close();
 }
}

产生以下结果：

此代码使用 org.openxmlformats.schemas.drawingml.x2006.chart.* 类并且可以与 apache poi 3.17 以及 apache poi 4.1.0.

一起使用

遗憾的是，org.openxmlformats.schemas.drawingml.x2006.chart.* public 没有任何 API 文档可用。所以如果我们需要它，我们需要从central.maven.org/maven2/org/apache/poi/ooxml-schemas/1.3下载ooxml-schemas-1.3-sources.jar。然后解压缩。然后转到目录 ooxml-schemas-1.3 并执行 javadoc -d javadoc -sourcepath ./ -subpackages org。之后我们在 ooxml-schemas-1.3/javadoc 中找到 API 文档。从 overview-tree.html 开始阅读。

对于apache poi 4.1.0，我们需要ooxml-schemas-1.4。

我也尝试过使用 apache poi 4.1.0 中的新 XDDF 东西。但是起初代码并没有真正便宜多少，其次它的缺点是当 XDDFNumericalDataSource<Double> values 中的某些数据不存在时 XDDFChart.plot 失败。然后我们必须将这些数据点设置为 0。但这与不存在不同。所以在这种情况下使用新的 XDDFstuff 并不是真正的进步。但是尽管如此，这是我试过的代码：

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

import org.apache.poi.xddf.usermodel.chart.*;

import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.util.List;

class ExcelChangeChartDataSource {

 static XSSFChart getChartWithTitle(XSSFSheet sheet, String wantedTitle) {
  if (sheet == null || wantedTitle == null) return null;
  XSSFDrawing drawing = sheet.createDrawingPatriarch();
  List<XSSFChart> charts = drawing.getCharts();
  for (XSSFChart chart : charts) {
   String title = chart.getTitleText().toString();
   if (wantedTitle.equals(title)) return chart;
  }
  return null;
 }

 static void addMonthDataToChart(XSSFSheet sheet, XSSFChart chart, String month, Double[] seriesData) {
  Row row;
  Cell cell;

  List<XDDFChartData> chartDataList = chart.getChartSeries();
  XDDFChartData chartData = chartDataList.get(0);

  List<XDDFChartData.Series> seriesList = chartData.getSeries();
  int ser = 0;
  for (XDDFChartData.Series series : seriesList) {
   XDDFDataSource categoryData = series.getCategoryData();
   AreaReference catReference = new AreaReference(categoryData.getDataRangeReference(), SpreadsheetVersion.EXCEL2007);
   CellReference firstCatCell = catReference.getFirstCell();
   CellReference lastCatCell = catReference.getLastCell();
   if (firstCatCell.getCol() == lastCatCell.getCol()) {
    int col = firstCatCell.getCol();
    int lastRow = lastCatCell.getRow();
    row = sheet.getRow(lastRow+1); if (row == null) row = sheet.createRow(lastRow+1);
    cell = row.getCell(col); if (cell == null) cell = row.createCell(col);
    cell.setCellValue(month);

    XDDFDataSource<String> category = XDDFDataSourcesFactory.fromStringCellRange(
                                       sheet, 
                                       new CellRangeAddress(firstCatCell.getRow(), lastRow+1, col, col));

    XDDFNumericalDataSource valuesData = series.getValuesData();
    AreaReference numReference = new AreaReference(valuesData.getDataRangeReference(), SpreadsheetVersion.EXCEL2007);
    CellReference firstNumCell = numReference.getFirstCell();
    CellReference lastNumCell = numReference.getLastCell();
    if (lastNumCell.getRow() == lastRow && firstNumCell.getCol() == lastNumCell.getCol()) {
     col = firstNumCell.getCol();
     row = sheet.getRow(lastRow+1); if (row == null) row = sheet.createRow(lastRow+1);
     cell = row.getCell(col); if (cell == null) cell = row.createCell(col);
     if (ser < seriesData.length) cell.setCellValue(seriesData[ser]);
     else cell.setCellValue(0); // Here we need set 0 where it not should be needed.

     XDDFNumericalDataSource<Double> values = XDDFDataSourcesFactory.fromNumericCellRange(
                                               sheet, 
                                               new CellRangeAddress(firstNumCell.getRow(), lastRow+1, col, col));

     series.replaceData(category, values);
    }
   }
   ser++;
  }
  chart.plot(chartData);
 }

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

  XSSFWorkbook workbook = (XSSFWorkbook)WorkbookFactory.create(new FileInputStream("WorkbookWithChart.xlsx"));

  XSSFSheet sheet = workbook.getSheetAt(0);

  XSSFChart chart = getChartWithTitle(sheet, "Z-Acceleration"); 

  if (chart != null) {
   addMonthDataToChart(sheet, chart, "Apr", new Double[]{7d,3d,5d});
   addMonthDataToChart(sheet, chart, "Mai", new Double[]{2d,6d,8d});
   addMonthDataToChart(sheet, chart, "Jun", new Double[]{1d,9d,4d});
   addMonthDataToChart(sheet, chart, "Jul", new Double[]{5d,6d});
  }

  FileOutputStream out = new FileOutputStream("WorkbookWithChartNew.xlsx");
  workbook.write(out);
  out.close();
  workbook.close();

 }
}

Answer 2

您可以通过将行高设置为零来从图表显示中删除数据，而不是添加新行。

首先，创建具有最大可能数据范围的图表，如下所示。

然后，使用以下代码将您不想在图表中看到的行设置为零高度。

    for(int i=8;i<14;i++) {
        sheet.getRow(i).setZeroHeight(true);;
    }

现在您将看到输出 Excel 更改为以下内容。

顺便说一句，您还可以通过将图表标题链接到单元格值来更新图表标题，如上例所示，图表标题链接到单元格 A1。

使用 Apache POI 更改 Excel 折线图中的数据范围

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