如何更新pptx散点图的分机列表值

Question

读取pptx模板，然后用新数据替换，有散点图

关联excel数据

xVal和yVal可以替换成功，但是如何替换C列（extList）？

xVal和yVal用下面的方式替换

final CTScatterSer ser = serList.get(0);
final CTAxDataSource xVal = ser.getXVal();
final CTNumDataSource yVal = ser.getYVal();
final CTExtension ctExtension = ser.getExtLst().getExtList().get(0);
final long ptCount = xVal.getNumRef().getNumCache().getPtCount().getVal();
for (int i = 0; i < scData.size(); i++) {
    SCNameDouble data = scData.get(i);

    CTNumVal xNumVal = ptCount > i ? xVal.getNumRef().getNumCache().getPtArray(i)
            : xVal.getNumRef().getNumCache().addNewPt();
    xNumVal.setIdx(i);
    xNumVal.setV(String.format("%.2f", data.xValue));

    CTNumVal yNumVal = ptCount > i ? yVal.getNumRef().getNumCache().getPtArray(i)
            : yVal.getNumRef().getNumCache().addNewPt();
    yNumVal.setIdx(i);
    yNumVal.setV(String.format("%.2f", data.yValue));

}

final int newSize = scData.size();
xVal.getNumRef().setF(
        replaceRowEnd(xVal.getNumRef().getF(),
                ptCount,
                newSize));
yVal.getNumRef().setF(
        replaceRowEnd(yVal.getNumRef().getF(),
                ptCount,
                newSize));

xVal.getNumRef().getNumCache().getPtCount().setVal(newSize);
yVal.getNumRef().getNumCache().getPtCount().setVal(newSize);

Answer 1

使用当前 apache poi 版本不应该尝试使用低级别 CT... 类来操纵图表。现在有 XDDF 此类案例。

如果涉及到PowerPoint图表，那么需要经常更新嵌入式工作簿中的数据和更新图表中的数据。有关使用条形图的示例，请参阅 Java edit bar chart in ppt by using poi。

当然，散点图是另一种情况，因为它没有类别轴，但有两个值轴。但这也可以使用 XDDF.

更新

您遇到的最大问题是数据标签。 XDDF 中目前还没有完全支持图表数据标签。并且由于您正在谈论 extLst 并且您的 Excel table 显示单元格范围内的数据标签，我怀疑您已经设置了来自单元格范围的数据标签。这是 Microsoft 发布 Office Open XML 时不存在的新功能。所以即使是低级别 CT... 类也无法支持该功能。

唯一的方法是使用基于 org.apache.xmlbeans.XmlObject.

的纯 XML 操作来操作 XML

以下显示了您根据您的问题似乎使用的模板示例。

ScatterChartSample.pptx:

代码：

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

import org.apache.poi.xslf.usermodel.*;
import org.apache.poi.xddf.usermodel.chart.*;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.AreaReference;

import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumns;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn;

public class PowerPointChangeScatterChartData {

 //patched version of XSSFTable.updateHeaders, see 
 static void updateHeaders(XSSFTable table) {
  XSSFSheet sheet = (XSSFSheet)table.getParent();
  CellReference ref = table.getStartCellReference();

  if (ref == null) return;

  int headerRow = ref.getRow();
  int firstHeaderColumn = ref.getCol();
  XSSFRow row = sheet.getRow(headerRow);
  DataFormatter formatter = new DataFormatter();

  if (row != null /*&& row.getCTRow().validate()*/) {
   int cellnum = firstHeaderColumn;
   CTTableColumns ctTableColumns = table.getCTTable().getTableColumns();
   if(ctTableColumns != null) {
    for (CTTableColumn col : ctTableColumns.getTableColumnList()) {
     XSSFCell cell = row.getCell(cellnum);
     if (cell != null) {
      col.setName(formatter.formatCellValue(cell));
     }
     cellnum++;
    }
   }
  }
 }

 static void updateScatterChart(XSLFChart chart, Object[][] data) throws Exception {
  // get chart's data source which is a Excel sheet
  XSSFWorkbook chartDataWorkbook = chart.getWorkbook();
  String sheetName = chartDataWorkbook.getSheetName(0);
  XSSFSheet chartDataSheet = chartDataWorkbook.getSheet(sheetName);
  // current Office uses a table as data source
  // so get that table if present
  XSSFTable chartDataTable = null;
  if (chartDataSheet.getTables().size() > 0) {
   chartDataTable = chartDataSheet.getTables().get(0);
  }

  if (chart.getChartSeries().size() == 1) { // we will process only one chart data
   XDDFChartData chartData = chart.getChartSeries().get(0);
   if (chartData.getSeriesCount() == 1) { // we will process only templates having one series

    int rMin = 1; // first row (0) is headers row
    int rMax = data.length - 1;

    // column 0 is X-Values
    int c = 0;
    // set new x data
    XDDFDataSource xs = null;
    for (int r = rMin; r <= rMax; r++) {
     XSSFRow row = chartDataSheet.getRow(r); if (row == null) row = chartDataSheet.createRow(r);
     XSSFCell cell = row.getCell(c); if (cell == null) cell = row.createCell(c);
     cell.setCellValue((Double)data[r][c]); // in sheet
    }
    xs = XDDFDataSourcesFactory.fromNumericCellRange(chartDataSheet, new CellRangeAddress(rMin,rMax,c,c)); // in chart
    
    // set new x-title in sheet
    String xTitle = (String)data[0][c];
    chartDataSheet.getRow(0).getCell(c).setCellValue(xTitle); // in sheet

    // column 1 is Y-Values 
    c = 1;
    // set new y data in sheet and in chart
    XDDFNumericalDataSource<Double> ys = null;
    for (int r = rMin; r <= rMax; r++) {
     XSSFRow row = chartDataSheet.getRow(r); if (row == null) row = chartDataSheet.createRow(r);
     XSSFCell cell = row.getCell(c); if (cell == null) cell = row.createCell(c);
     cell.setCellValue((Double)data[r][c]); // in sheet
    }
    ys = XDDFDataSourcesFactory.fromNumericCellRange(chartDataSheet, new CellRangeAddress(rMin,rMax,c,c)); 
    XDDFChartData.Series series1 = chartData.getSeries(0);
    series1.replaceData(xs, ys); // in chart

    // set new y-title in sheet and in chart
    String yTitle = (String)data[0][c];
    chartDataSheet.getRow(0).getCell(c).setCellValue(yTitle); // in sheet
    series1.setTitle(yTitle, new CellReference(sheetName, 0, c, true, true)); // in chart

    series1.plot(); 
    
    // column 2 is data-labels-range
    c = 2;
    // set new data labels data in sheet and in chart
    XDDFDataSource dataLabelsRangeSource = null;
    for (int r = rMin; r <= rMax; r++) {
     XSSFRow row = chartDataSheet.getRow(r); if (row == null) row = chartDataSheet.createRow(r);
     XSSFCell cell = row.getCell(c); if (cell == null) cell = row.createCell(c);
     cell.setCellValue((String)data[r][c]); // in sheet
    }
    dataLabelsRangeSource = XDDFDataSourcesFactory.fromStringCellRange(chartDataSheet, new CellRangeAddress(rMin,rMax,c,c)); // in chart
    updateDataLabelsRange(chart, dataLabelsRangeSource); // in chart

    // set new data-labels-title in sheet
    String descrTitle = (String)data[0][c];
    chartDataSheet.getRow(0).getCell(c).setCellValue(descrTitle); // in sheet
    
    // update the table if present
    if (chartDataTable != null) {
     CellReference topLeft = new CellReference(chartDataSheet.getRow(0).getCell(0));
     CellReference bottomRight = new CellReference(chartDataSheet.getRow(rMax).getCell(c));
     AreaReference tableArea = chartDataWorkbook.getCreationHelper().createAreaReference(topLeft, bottomRight);
     chartDataTable.setArea(tableArea);
     updateHeaders(chartDataTable);
    }

   }
  }
 }  
 
 static void updateDataLabelsRange(XDDFChart chart, XDDFDataSource dataLabelsRangeSource) {
  String declareNameSpaces = "declare namespace c='http://schemas.openxmlformats.org/drawingml/2006/chart'; " 
                           + "declare namespace c15='http://schemas.microsoft.com/office/drawing/2012/chart' ";
  org.apache.xmlbeans.XmlObject[] selectedObjects = chart.getCTChart().selectPath(
   declareNameSpaces 
   + ".//c:ext[c15:datalabelsRange]"); // needs net.sf.saxon - Saxon-HE (Saxon-HE-10.6.jar)
 
  if (selectedObjects.length > 0) { // we have at least one ext containing datalabelsRange
   org.apache.xmlbeans.XmlObject ext = selectedObjects[0]; // get first ext containing datalabelsRange
   // get dataLabelsRange
   org.apache.xmlbeans.XmlObject[] datalabelsRanges = ext.selectChildren(new javax.xml.namespace.QName("http://schemas.microsoft.com/office/drawing/2012/chart", "datalabelsRange", "c15"));
   org.apache.xmlbeans.XmlObject dataLabelsRange = datalabelsRanges[0];
   // set formula
   org.apache.xmlbeans.XmlObject[] formulas = dataLabelsRange.selectChildren(new javax.xml.namespace.QName("http://schemas.microsoft.com/office/drawing/2012/chart", "f", "c15"));
   org.apache.xmlbeans.XmlObject formula = formulas[0];
   ((org.apache.xmlbeans.impl.values.XmlObjectBase)formula).setStringValue(dataLabelsRangeSource.getFormula());
   // get dlblRangeCache
   org.apache.xmlbeans.XmlObject[] dlblRangeCaches = dataLabelsRange.selectChildren(new javax.xml.namespace.QName("http://schemas.microsoft.com/office/drawing/2012/chart", "dlblRangeCache", "c15"));
   org.apache.xmlbeans.XmlObject dlblRangeCache = dlblRangeCaches[0];
   // empty the cache
   dlblRangeCache.newCursor().removeXmlContents();
   // create new cache from dataLabelsRangeSource
   org.openxmlformats.schemas.drawingml.x2006.chart.CTStrData cache = org.openxmlformats.schemas.drawingml.x2006.chart.CTStrData.Factory.newInstance();
   dataLabelsRangeSource.fillStringCache(cache);
   // set new cache
   dlblRangeCache.set(cache);   
  }
 }

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

  String filePath = "ScatterChartSample.pptx"; // has template scatter chart
  String filePathNew = "ScatterChartSample_New.pptx";

  Object[][] data = new Object[][] { // new data 1 series, 6 x-y-values and data labels
   {"X-Values", "Y-Values", "DataLabels"}, // series title
   {0.7d, 1.7d, "aa"}, // x1
   {1.8d, 3.2d, "bb"}, // x2
   {2.6d, 2.8d, "cc"}, // x3
   {1.7d, 3.7d, "dd"}, // x4
   {2.8d, 4.2d, "ee"}, // x5
   {3.6d, 1.8d, "ff"} // x6
  };

  XMLSlideShow slideShow = new XMLSlideShow(new FileInputStream(filePath));

  XSLFChart chart = slideShow.getCharts().get(0);

  updateScatterChart(chart, data);

  FileOutputStream out = new FileOutputStream(filePathNew); 
  slideShow.write(out);
  out.close();
  slideShow.close();
 }

}

结果ScatterChartSample_New.pptx：

注意：使用当前 apache poi 5.2.0.

进行测试和工作

为了能够将 XPath 用作 .//c:ext[c15:datalabelsRange]，它需要 net.sf.saxon - Saxon-HE（在我的例子中是 Saxon-HE-10.6.jar）。

它需要 poi-ooxml-full-5.2.0.jar 而不仅仅是 ooxml-schemas 的精简版。

如何更新pptx散点图的分机列表值

how to update ext list value of pptx scatter chart

powerpoint

apache-poi