使用apache poi和ooxml-schemas实现具有2列的条形图的最简单方法

Question

我正在尝试在如下所示的xlsx文件中创建2列的n条形图。

但这让我感到困惑，无法理解org.openxmlformats.schemas.drawingml.x2006.chart中的类是如何工作的。

我已经尝试过了，但是生成文件没有得到我绘制的图表。

我有此代码：

        Drawing drawing = planilha.createDrawingPatriarch();
        ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 5, 15);

        Chart chart = drawing.createChart(anchor);

        CTChart ctChart = ((XSSFChart)chart).getCTChart();
        CTPlotArea ctPlotArea = ctChart.getPlotArea();
        CTBarChart ctBarChart = ctPlotArea.addNewBarChart();
        CTBoolean ctBoolean = ctBarChart.addNewVaryColors();
        ctBoolean.setVal(true);
        ctBarChart.addNewBarDir().setVal(STBarDir.COL);

           CellRangeAddress rangeAreas =  new CellRangeAddress(1,3,1,1);
        CellRangeAddress rangeTotais = new CellRangeAddress(1,3,5,5);

        CTBarSer ctBarSer = ctBarChart.addNewSer();
        CTSerTx ctSerTx = ctBarSer.addNewTx();
        CTStrRef ctStrRef = ctSerTx.addNewStrRef();
        ctStrRef.setF("Gráfico!"+rangeAreas.formatAsString());

        CTNumDataSource ctNumDataSource = ctBarSer.addNewVal();
        CTNumRef ctNumRef = ctNumDataSource.addNewNumRef();
        ctNumRef.setF("Gráfico!"+rangeTotais.formatAsString());
        //this code below I copied of an example and I don't know what is necessary 
        ctBarChart.addNewAxId().setVal(123456);
        ctBarChart.addNewAxId().setVal(123457);

        CTCatAx ctCatAx = ctPlotArea.addNewCatAx(); 
        ctCatAx.addNewAxId().setVal(123456); //id of the cat axis
        CTScaling ctScaling = ctCatAx.addNewScaling();
        ctScaling.addNewOrientation().setVal(STOrientation.MIN_MAX);
        ctCatAx.addNewDelete().setVal(false);
        ctCatAx.addNewAxPos().setVal(STAxPos.B);
        ctCatAx.addNewCrossAx().setVal(123457); //id of the val axis
        ctCatAx.addNewTickLblPos().setVal(STTickLblPos.NEXT_TO);

        CTValAx ctValAx = ctPlotArea.addNewValAx(); 
        ctValAx.addNewAxId().setVal(123457); //id of the val axis
        ctScaling = ctValAx.addNewScaling();
        ctScaling.addNewOrientation().setVal(STOrientation.MIN_MAX);
        ctValAx.addNewDelete().setVal(false);
        ctValAx.addNewAxPos().setVal(STAxPos.L);
        ctValAx.addNewCrossAx().setVal(123456); //id of the cat axis
        ctValAx.addNewTickLblPos().setVal(STTickLblPos.NEXT_TO);

Answer 1

使用最后一个稳定的版本apache poi 4.0.0，可以创建条形图，而无需使用底层的底层bean。为此，使用了Package org.apache.poi.xddf.usermodel。

到目前为止，XDDF的某些部分还存在问题。因此，我们需要修理一些东西。但是，尽管如此，我们应该使用这些类而不是底层的底层bean。

您所需的示例：

来源：

代码：

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

import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xddf.usermodel.PresetColor;
import org.apache.poi.xddf.usermodel.XDDFColor;
import org.apache.poi.xddf.usermodel.XDDFShapeProperties;
import org.apache.poi.xddf.usermodel.XDDFSolidFillProperties;
import org.apache.poi.xddf.usermodel.chart.AxisCrosses;
import org.apache.poi.xddf.usermodel.chart.AxisCrossBetween;
import org.apache.poi.xddf.usermodel.chart.AxisPosition;
import org.apache.poi.xddf.usermodel.chart.ChartTypes;
import org.apache.poi.xddf.usermodel.chart.LegendPosition;
import org.apache.poi.xddf.usermodel.chart.XDDFCategoryAxis;
import org.apache.poi.xddf.usermodel.chart.XDDFChartData;
import org.apache.poi.xddf.usermodel.chart.XDDFChartLegend;
import org.apache.poi.xddf.usermodel.chart.XDDFDataSource;
import org.apache.poi.xddf.usermodel.chart.XDDFDataSourcesFactory;
import org.apache.poi.xddf.usermodel.chart.XDDFNumericalDataSource;
import org.apache.poi.xddf.usermodel.chart.XDDFValueAxis;
import org.apache.poi.xssf.usermodel.XSSFChart;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelBarChartFromExistingData {

  public static void main(String[] args) throws IOException {
    try (XSSFWorkbook wb = (XSSFWorkbook)WorkbookFactory.create(new FileInputStream("Workbook.xlsx"))) {
      XSSFSheet sheet = wb.getSheet("Sheet1");

      XSSFDrawing drawing = sheet.createDrawingPatriarch();
      XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 10, 15);

      XSSFChart chart = drawing.createChart(anchor);
      XDDFChartLegend legend = chart.getOrAddLegend();
      legend.setPosition(LegendPosition.TOP_RIGHT);

      // Use a category axis for the bottom axis.
      XDDFCategoryAxis bottomAxis = chart.createCategoryAxis(AxisPosition.BOTTOM);
      XDDFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);
      leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);
      leftAxis.setCrossBetween(AxisCrossBetween.BETWEEN);

      XDDFDataSource<String> xs = XDDFDataSourcesFactory.fromStringCellRange(sheet,
          new CellRangeAddress(1, 3, 1, 1));
      XDDFNumericalDataSource<Double> ys = XDDFDataSourcesFactory.fromNumericCellRange(sheet,
          new CellRangeAddress(1, 3, 5, 5));

      XDDFChartData data = chart.createData(ChartTypes.BAR, bottomAxis, leftAxis);
      data.addSeries(xs, ys);
      chart.plot(data);

      //Since XDDF stuff is buggy until now, we need to repair something.

      //repairing set the kind of bar char, either bar chart or column chart:
      chart.getCTChart().getPlotArea().getBarChartArray(0).addNewBarDir().setVal(
       org.openxmlformats.schemas.drawingml.x2006.chart.STBarDir.COL);
       //org.openxmlformats.schemas.drawingml.x2006.chart.STBarDir.BAR);

      //repairing telling the axis Ids in bar chart:
      chart.getCTChart().getPlotArea().getBarChartArray(0).addNewAxId().setVal(bottomAxis.getId());
      chart.getCTChart().getPlotArea().getBarChartArray(0).addNewAxId().setVal(leftAxis.getId());

      XDDFSolidFillProperties fill = new XDDFSolidFillProperties(XDDFColor.from(PresetColor.BLUE));
      XDDFChartData.Series firstSeries = data.getSeries().get(0);
      XDDFShapeProperties properties = firstSeries.getShapeProperties();
      if (properties == null) {
        properties = new XDDFShapeProperties();
      }
      properties.setFillProperties(fill);
      firstSeries.setShapeProperties(properties);

      // Write the output to a file
      try (FileOutputStream fileOut = new FileOutputStream("WorkbookNew.xlsx")) {
        wb.write(fileOut);
      }
    }
  }
}

结果：

要回答您的隐式问题，如何理解org.openxmlformats.schemas.drawingml.x2006.chart中的类：

要知道这一点，我们需要了解Excel如何存储其数据。 *.xlsx文件只是ZIP档案。因此，我们可以简单地解压缩它们并进行查看。

我们找到了XML个文件。例如，对于图表/xl/charts/chart1.xml。现在首先我们需要了解XML。

然后，我们需要有关org.openxmlformats.schemas.drawingml.x2006.chart软件包的信息。我们可以下载ooxml-schemas-1.4-sources.jar，然后进行javadoc。现在，我们有一个API文档，其中包含所有底层bean包含包org.openxmlformats.schemas.drawingml.x2006.chart。