如何创建java poi条形图组合两个条形值如给定图像？

Question

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我想用java poi创建条形图，（有两组条形图），直到现在才能找到单一类型的条形图，任何人都可以帮我解决任何问题吗？ 感谢。

Answer 1

您的问题不清楚使用您已找到的apache poi创建条形图的代码。到目前为止apache poi仅支持折线图和散点图，但不直接支持条形图。因此，只有使用底层的低级对象才能创建条形图。作为参考，请从org.openxmlformats.schemas.drawingml.x2006.chart.CTChart开始。

创建示例图表的示例代码：

import java.io.FileOutputStream;

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

import org.apache.poi.ss.SpreadsheetVersion;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFChart;

import org.openxmlformats.schemas.drawingml.x2006.chart.CTChart;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTPlotArea;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTBarChart;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTBoolean;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTBarSer;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTAxDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumRef;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTStrRef;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTSerTx;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTCatAx;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTValAx;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTScaling;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTLegend;
import org.openxmlformats.schemas.drawingml.x2006.chart.STAxPos;
import org.openxmlformats.schemas.drawingml.x2006.chart.STBarDir;
import org.openxmlformats.schemas.drawingml.x2006.chart.STOrientation;
import org.openxmlformats.schemas.drawingml.x2006.chart.STLegendPos;
import org.openxmlformats.schemas.drawingml.x2006.chart.STTickLblPos;

public class BarChart {

 private static CTChart createDefaultBarChart(Chart chart, CellReference firstDataCell, CellReference lastDataCell, boolean seriesInCols) {

  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);

  int firstDataRow = firstDataCell.getRow(); 
  int lastDataRow = lastDataCell.getRow(); 
  int firstDataCol = firstDataCell.getCol(); 
  int lastDataCol = lastDataCell.getCol();
  String dataSheet = firstDataCell.getSheetName(); 

  int idx = 0;

  if (seriesInCols) { //the series are in the columns of the data cells

   for (int c = firstDataCol + 1; c < lastDataCol + 1; c++) {
    CTBarSer ctBarSer = ctBarChart.addNewSer();
    CTSerTx ctSerTx = ctBarSer.addNewTx();
    CTStrRef ctStrRef = ctSerTx.addNewStrRef();
    ctStrRef.setF(new CellReference(dataSheet, firstDataRow, c, true, true).formatAsString());

    ctBarSer.addNewIdx().setVal(idx++);  
    CTAxDataSource cttAxDataSource = ctBarSer.addNewCat();
    ctStrRef = cttAxDataSource.addNewStrRef();

    ctStrRef.setF(new AreaReference(
                  new CellReference(dataSheet, firstDataRow + 1, firstDataCol, true, true), 
                  new CellReference(dataSheet, lastDataRow, firstDataCol, true, true), 
                  SpreadsheetVersion.EXCEL2007).formatAsString()); 

    CTNumDataSource ctNumDataSource = ctBarSer.addNewVal();
    CTNumRef ctNumRef = ctNumDataSource.addNewNumRef();

    ctNumRef.setF(new AreaReference(
                  new CellReference(dataSheet, firstDataRow + 1, c, true, true), 
                  new CellReference(dataSheet, lastDataRow, c, true, true), 
                  SpreadsheetVersion.EXCEL2007).formatAsString()); 

    //at least the border lines in Libreoffice Calc ;-)
    ctBarSer.addNewSpPr().addNewLn().addNewSolidFill().addNewSrgbClr().setVal(new byte[] {0,0,0});   

   }
  } else { //the series are in the rows of the data cells

   for (int r = firstDataRow + 1; r < lastDataRow + 1; r++) {
    CTBarSer ctBarSer = ctBarChart.addNewSer();
    CTSerTx ctSerTx = ctBarSer.addNewTx();
    CTStrRef ctStrRef = ctSerTx.addNewStrRef();
    ctStrRef.setF(new CellReference(dataSheet, r, firstDataCol, true, true).formatAsString());

    ctBarSer.addNewIdx().setVal(idx++);  
    CTAxDataSource cttAxDataSource = ctBarSer.addNewCat();
    ctStrRef = cttAxDataSource.addNewStrRef();

    ctStrRef.setF(new AreaReference(
                  new CellReference(dataSheet, firstDataRow, firstDataCol + 1, true, true), 
                  new CellReference(dataSheet, firstDataRow, lastDataCol, true, true), 
                  SpreadsheetVersion.EXCEL2007).formatAsString()); 

    CTNumDataSource ctNumDataSource = ctBarSer.addNewVal();
    CTNumRef ctNumRef = ctNumDataSource.addNewNumRef();

    ctNumRef.setF(new AreaReference(
                  new CellReference(dataSheet, r, firstDataCol + 1, true, true), 
                  new CellReference(dataSheet, r, lastDataCol, true, true), 
                  SpreadsheetVersion.EXCEL2007).formatAsString()); 

    //at least the border lines in Libreoffice Calc ;-)
    ctBarSer.addNewSpPr().addNewLn().addNewSolidFill().addNewSrgbClr().setVal(new byte[] {0,0,0});   

   }
  }

  //telling the BarChart that it has axes and giving them Ids
  ctBarChart.addNewAxId().setVal(123456);
  ctBarChart.addNewAxId().setVal(123457);

  //cat axis
  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);

  //val axis
  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);

  //legend
  CTLegend ctLegend = ctChart.addNewLegend();
  ctLegend.addNewLegendPos().setVal(STLegendPos.B);
  ctLegend.addNewOverlay().setVal(false);

  return ctChart;

 }

 public static void main(String[] args) throws Exception {
  Workbook wb = new XSSFWorkbook();
  Sheet sheet = wb.createSheet("Sheet1");

  DataFormat format = wb.createDataFormat();

  CellStyle oneDecimal = wb.createCellStyle();
  oneDecimal.setDataFormat(format.getFormat("0.0"));

  //put some data in the sheet
  Row row;
  Cell cell;

  row = sheet.createRow(0);
  row.createCell(0);
  row.createCell(1).setCellValue("Male");
  row.createCell(2).setCellValue("Female");

  for (int r = 1; r < 7; r++) {
   row = sheet.createRow(r);
   cell = row.createCell(0);
   cell.setCellValue(1975 + r*5);
   cell = row.createCell(1);
   cell.setCellValue(java.util.concurrent.ThreadLocalRandom.current().nextDouble(40.0, 70.0));
   cell.setCellStyle(oneDecimal);
   cell = row.createCell(2);
   cell.setCellValue(java.util.concurrent.ThreadLocalRandom.current().nextDouble(40.0, 70.0));
   cell.setCellStyle(oneDecimal);
  }

  //create empty chart in the sheet
  Drawing drawing = sheet.createDrawingPatriarch();
  ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 7, 8, 20);
  Chart chart = drawing.createChart(anchor);

  //create the references to the chart data
  CellReference firstDataCell = new CellReference(sheet.getSheetName(), 0, 0, true, true);
  CellReference lastDataCell = new CellReference(sheet.getSheetName(), 6, 2, true, true);

  //create a default bar chart from the data
  CTChart ctBarChart = createDefaultBarChart(chart, firstDataCell, lastDataCell, true);

  //now we can customizing the chart

  //legend position:
  ctBarChart.getLegend().unsetLegendPos();
  ctBarChart.getLegend().addNewLegendPos().setVal(STLegendPos.R);

  //data labels:
  CTBoolean ctboolean = CTBoolean.Factory.newInstance();
  ctboolean.setVal(true);
  ctBarChart.getPlotArea().getBarChartArray(0).addNewDLbls().setShowVal(ctboolean);
  ctboolean.setVal(false);
  ctBarChart.getPlotArea().getBarChartArray(0).getDLbls().setShowSerName(ctboolean);
  ctBarChart.getPlotArea().getBarChartArray(0).getDLbls().setShowPercent(ctboolean);
  ctBarChart.getPlotArea().getBarChartArray(0).getDLbls().setShowLegendKey(ctboolean);
  ctBarChart.getPlotArea().getBarChartArray(0).getDLbls().setShowCatName(ctboolean);
  ctBarChart.getPlotArea().getBarChartArray(0).getDLbls().setShowLeaderLines(ctboolean);
  ctBarChart.getPlotArea().getBarChartArray(0).getDLbls().setShowBubbleSize(ctboolean);

  //val axis maximum:
  ctBarChart.getPlotArea().getValAxArray(0).getScaling().addNewMax().setVal(100);

  //cat axis title:
  ctBarChart.getPlotArea().getCatAxArray(0).addNewTitle().addNewOverlay().setVal(false);
  ctBarChart.getPlotArea().getCatAxArray(0).getTitle().addNewTx().addNewRich().addNewBodyPr();
  ctBarChart.getPlotArea().getCatAxArray(0).getTitle().getTx().getRich().addNewP().addNewR().setT("School Year");

  //series colors:
  ctBarChart.getPlotArea().getBarChartArray(0).getSerArray(0).getSpPr().addNewSolidFill().addNewSrgbClr().setVal(new byte[]{0,0,(byte)255});
  ctBarChart.getPlotArea().getBarChartArray(0).getSerArray(1).getSpPr().addNewSolidFill().addNewSrgbClr().setVal(new byte[]{0,(byte)255,0});

  FileOutputStream fileOut = new FileOutputStream("BarChart.xlsx");
  wb.write(fileOut);
  wb.close();
 }
}

此示例需要FAQ-N10025中提到的所有模式ooxml-schemas-1.3.jar的完整jar。