问题
I need a sample code in Java, currently I am able to draw line charts after reading values from sheet, and I also want to generate pie chart.
Example code I have tried which is for .ppt format.
I want the same in excel for pie chart in java.
String[] categories = listCategories.toArray(new String[listCategories.size()]);
Double[] values = listValues.toArray(new Double[listValues.size()]);
final int numOfPoints = categories.length;
final String categoryDataRange = chart.formatRange(new CellRangeAddress(1, numOfPoints, 0, 0));
final String valuesDataRange = chart.formatRange(new CellRangeAddress(1, numOfPoints, 1, 1));
final XDDFDataSource<?> categoriesData = XDDFDataSourcesFactory.fromArray(categories, categoryDataRange);
final XDDFNumericalDataSource<? extends Number> valuesData = XDDFDataSourcesFactory.fromArray(values, valuesDataRange);
XDDFPieChartData.Series firstSeries = (XDDFPieChartData.Series) pie.getSeries().get(0);
firstSeries.replaceData(categoriesData, valuesData);
firstSeries.setTitle(chartTitle, chart.setSheetTitle(chartTitle, 0));
firstSeries.setExplosion(25);
chart.plot(pie);
回答1:
Derived from the chart examples in https://svn.apache.org/repos/asf/poi/trunk/src/examples/src/org/apache/poi/xssf/usermodel/examples/ here is a PieChart example using the XDDF stuff:
import java.io.FileOutputStream;
import java.io.IOException;
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.chart.LegendPosition;
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.XDDFPieChartData;
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 PieChart {
public static void main(String[] args) throws IOException {
try (XSSFWorkbook wb = new XSSFWorkbook()) {
XSSFSheet sheet = wb.createSheet("piechart");
final int NUM_OF_ROWS = 2;
final int NUM_OF_COLUMNS = 10;
// Create a row and put some cells in it. Rows are 0 based.
Row row;
Cell cell;
for (int rowIndex = 0; rowIndex < NUM_OF_ROWS; rowIndex++) {
row = sheet.createRow((short) rowIndex);
for (int colIndex = 0; colIndex < NUM_OF_COLUMNS; colIndex++) {
cell = row.createCell((short) colIndex);
if (rowIndex == 0) cell.setCellValue("Cat " + (colIndex + 1));
else cell.setCellValue((colIndex + 1) * (rowIndex + 1));
}
}
XSSFDrawing drawing = sheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 4, 10, 25);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Pie Chart");
chart.setTitleOverlay(false);
XDDFChartLegend legend = chart.getOrAddLegend();
legend.setPosition(LegendPosition.TOP_RIGHT);
XDDFDataSource<String> cat = XDDFDataSourcesFactory.fromStringCellRange(sheet,
new CellRangeAddress(0, 0, 0, NUM_OF_COLUMNS - 1));
XDDFNumericalDataSource<Double> val = XDDFDataSourcesFactory.fromNumericCellRange(sheet,
new CellRangeAddress(1, 1, 0, NUM_OF_COLUMNS - 1));
XDDFChartData data = new XDDFPieChartData(chart.getCTChart().getPlotArea().addNewPieChart());
data.setVaryColors(true);
data.addSeries(cat, val);
chart.plot(data);
// Write the output to a file
try (FileOutputStream fileOut = new FileOutputStream("ooxml-pie-chart.xlsx")) {
wb.write(fileOut);
}
}
}
}
The above is the minimal example using only the XDDF stuff. Here is a more extended version which sets data labels and makes the chart visible in LibreOffice/OpenOffice Calc. But this needs using the low level org.openxmlformats.schemas.drawingml.x2006.chart.* stuff.
import java.io.FileOutputStream;
import java.io.IOException;
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.chart.LegendPosition;
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.XDDFPieChartData;
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;
import org.apache.poi.xssf.usermodel.DefaultIndexedColorMap;
public class PieChart {
public static void main(String[] args) throws IOException {
try (XSSFWorkbook wb = new XSSFWorkbook()) {
XSSFSheet sheet = wb.createSheet("piechart");
final int NUM_OF_ROWS = 2;
final int NUM_OF_COLUMNS = 10;
// Create a row and put some cells in it. Rows are 0 based.
Row row;
Cell cell;
for (int rowIndex = 0; rowIndex < NUM_OF_ROWS; rowIndex++) {
row = sheet.createRow((short) rowIndex);
for (int colIndex = 0; colIndex < NUM_OF_COLUMNS; colIndex++) {
cell = row.createCell((short) colIndex);
if (rowIndex == 0) cell.setCellValue("Cat " + (colIndex + 1));
else cell.setCellValue((colIndex + 1) * (rowIndex + 1));
}
}
XSSFDrawing drawing = sheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 4, 10, 25);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Pie Chart");
chart.setTitleOverlay(false);
XDDFChartLegend legend = chart.getOrAddLegend();
legend.setPosition(LegendPosition.TOP_RIGHT);
XDDFDataSource<String> cat = XDDFDataSourcesFactory.fromStringCellRange(sheet,
new CellRangeAddress(0, 0, 0, NUM_OF_COLUMNS - 1));
XDDFNumericalDataSource<Double> val = XDDFDataSourcesFactory.fromNumericCellRange(sheet,
new CellRangeAddress(1, 1, 0, NUM_OF_COLUMNS - 1));
XDDFChartData data = new XDDFPieChartData(chart.getCTChart().getPlotArea().addNewPieChart());
data.setVaryColors(true);
XDDFChartData.Series series = data.addSeries(cat, val);
chart.plot(data);
// Add data labels
if (!chart.getCTChart().getPlotArea().getPieChartArray(0).getSerArray(0).isSetDLbls())
chart.getCTChart().getPlotArea().getPieChartArray(0).getSerArray(0).addNewDLbls();
chart.getCTChart().getPlotArea().getPieChartArray(0).getSerArray(0).getDLbls()
.addNewDLblPos().setVal(org.openxmlformats.schemas.drawingml.x2006.chart.STDLblPos.OUT_END);
chart.getCTChart().getPlotArea().getPieChartArray(0).getSerArray(0).getDLbls()
.addNewShowLegendKey().setVal(true);
chart.getCTChart().getPlotArea().getPieChartArray(0).getSerArray(0).getDLbls()
.addNewShowPercent().setVal(true);
// Do not auto delete the title; is necessary for showing title in Calc
if (chart.getCTChart().getAutoTitleDeleted() == null) chart.getCTChart().addNewAutoTitleDeleted();
chart.getCTChart().getAutoTitleDeleted().setVal(false);
// Data point colors; is necessary for showing data points in Calc
int pointCount = series.getCategoryData().getPointCount();
for (int p = 0; p < pointCount; p++) {
chart.getCTChart().getPlotArea().getPieChartArray(0).getSerArray(0).addNewDPt().addNewIdx().setVal(p);
chart.getCTChart().getPlotArea().getPieChartArray(0).getSerArray(0).getDPtArray(p)
.addNewSpPr().addNewSolidFill().addNewSrgbClr().setVal(DefaultIndexedColorMap.getDefaultRGB(p+10));
}
// Write the output to a file
try (FileOutputStream fileOut = new FileOutputStream("ooxml-pie-chart.xlsx")) {
wb.write(fileOut);
}
}
}
}
This code needs the full jar of all of the schemas ooxml-schemas-1.4.jar as mentioned in FAQ-N10025.
Since version apache poi 4.1.1 creation of the XDDFChartData data must be changed like:
...
import org.apache.poi.xddf.usermodel.chart.ChartTypes;
...
//XDDFChartData data = new XDDFPieChartData(chart.getCTChart().getPlotArea().addNewPieChart());
XDDFChartData data = chart.createData(ChartTypes.PIE, null, null);
...
回答2:
Also, as this answer is what shows google, I would like to add that the options mentioned at org.openxmlformats.schemas.drawingml.x2006.chart.STDLblPos.OUT_END maps to the options available at "Format Data Labels" in excel (or see https://www.youtube.com/watch?v=y85DOG5FOVc). To open that, right click on the chart to show that menu option. That is useful if you want to hide some data. By default show almost everything. For example, to show only the value data:
dLbls.addNewDLblPos().setVal(org.openxmlformats.schemas.drawingml.x2006.chart.STDLblPos.BEST_FIT);
dLbls.addNewShowLegendKey().setVal(false);
dLbls.addNewShowPercent().setVal(false);
dLbls.addNewShowCatName().setVal(false);
dLbls.addNewShowSerName().setVal(false);
dLbls.addNewShowVal().setVal(true);
dLbls.addNewShowLeaderLines().setVal(false);
来源：https://stackoverflow.com/questions/54885970/how-to-generate-piechart-using-apache-poi-4-0-xddfchartdata-xddfpiechartdata-i