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 个条形图。但是让我很困惑，要了解里面的类是如何org.openxmlformats.schemas.drawingml.x2006.chart工作的。我已经试过了，但是生成文件没有得到我绘制的图表。我有这个代码：        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);

Answer 1

使用apache poi 4.0.0，最后一个稳定版本，可以在不使用底层基础 bean 的情况下创建条形图。对于这个包 org.apache.poi.xddf.usermodel被使用。

XDDF直到现在，这些东西的某些部分还是有问题的。所以我们需要修复一些东西。但是我们应该使用这些类而不是底层的底层 bean。

您的要求示例：

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:

      if (chart.getCTChart().getPlotArea().getBarChartArray(0).getBarDir() == null) 

       chart.getCTChart().getPlotArea().getBarChartArray(0).addNewBarDir();

      chart.getCTChart().getPlotArea().getBarChartArray(0).getBarDir().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:

      if (chart.getCTChart().getPlotArea().getBarChartArray(0).getAxIdList().size() == 0) {

       chart.getCTChart().getPlotArea().getBarChartArray(0).addNewAxId().setVal(bottomAxis.getId());

       chart.getCTChart().getPlotArea().getBarChartArray(0).addNewAxId().setVal(leftAxis.getId());

      }

      //repairing no Tx when there is no title

      if (chart.getCTChart().getPlotArea().getBarChartArray(0).getSerArray(0).getTx() != null)

       chart.getCTChart().getPlotArea().getBarChartArray(0).getSerArray(0).unsetTx();

      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：

要回答你隐含的问题如何理解里面的类org.openxmlformats.schemas.drawingml.x2006.chart：

要知道这一点，我们需要知道如何Excel存储它的数据。这些*.xlsx文件只是ZIP档案。所以我们可以简单地解压缩它们并查看。

在那里我们找到XML文件。以图表/xl/charts/chart1.xml为例。现在首先我们需要了解 XML.

然后我们需要关于org.openxmlformats.schemas.drawingml.x2006.chart包的信息。我们可以下载ooxml-schemas-1.4-sources.jar，然后这样做javadoc。现在我们有一个API包含所有底层 bean的文档包org.openxmlformats.schemas.drawingml.x2006.chart。