关于格式化坐标轴标题的问题已经得到解答。见Resizing legend and axis title in a apache poi bar chart。
“要精确地添加值的数量”到数据条意味着设置数据标签。直到现在，这不是直接支持 ny Apache POI。所以使用低级别的org.openxmlformats.schemas.drawingml.x2006.chart.* 类是必要的。见https://stackoverflow.com/search?tab=newest&q=user%3a3915431%20add%20data%20labels。当然，这不是很舒服。所以我尝试为此创建一个方法void setDataLabels(XDDFChartData.Series series, int pos, boolean... show)。
int pos 可以是以下之一：
INT_BEST_FIT 1 - positions data label at best fit to be readable
INT_B 2 - positions data label at bottom
INT_CTR 3 - positions data label at center
INT_IN_BASE 4 - positions data label inside at base
INT_IN_END 5 - positions data label inside at the end
INT_L 6 - positions data label at left
INT_OUT_END 7 - positions data label outside at the end
INT_R 8 - positions data label at right
INT_T 9 - positions data label at top
并非所有图表类型都支持所有仓位。
boolean... show 是一个布尔值列表，用于判断数据标签中哪些内容应可见 (true) 或不可见 (false)。顺序如下：
ShowVal, ShowLegendKey, ShowCatName, ShowSerName, ShowPercent, ShowBubbleSize, ShowLeaderLines
完整示例：
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.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.BarDirection;
import org.apache.poi.xddf.usermodel.chart.ChartTypes;
import org.apache.poi.xddf.usermodel.chart.LegendPosition;
import org.apache.poi.xddf.usermodel.chart.XDDFBarChartData;
import org.apache.poi.xddf.usermodel.chart.XDDFLineChartData;
import org.apache.poi.xddf.usermodel.chart.XDDFPieChartData;
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.xddf.usermodel.chart.XDDFTitle;
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;
/**
* Bar chart example.
*/
public final class BarChart {
private BarChart() {}
public static void main(String[] args) throws IOException {
Object[][] chartData = new Object[][]{
new Object[]{"Client 1", "Client 2", "Client 3", "Client 4", "Client 5", "Client 6", "Client 7", "Client 8"},
new Object[]{12, 2.345d, 34, 6, 45.6d, .456d, 50.5d, 12.345d},
};
try (XSSFWorkbook wb = new XSSFWorkbook()) {
XSSFSheet sheet = wb.createSheet("barchart");
// put sheet data
Row row;
Cell cell;
int rowIndex = 0;
int colIndex = 0;
for (Object[] dataRow : chartData) {
row = sheet.createRow((short) rowIndex);
colIndex = 0;
for (Object value : dataRow) {
cell = row.createCell((short) colIndex);
if (value instanceof String) cell.setCellValue((String)value);
if (value instanceof Number) cell.setCellValue(((Number)value).doubleValue());
colIndex++;
}
rowIndex++;
}
// create the chart
// chart data sources
XDDFDataSource<String> xs = XDDFDataSourcesFactory.fromStringCellRange(sheet, new CellRangeAddress(0, 0, 0, colIndex - 1));
XDDFNumericalDataSource<Double> ys1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet, new CellRangeAddress(1, 1, 0, colIndex - 1));
// chart in drawing
XSSFDrawing drawing = sheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 3, 8, 20);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Turnover Rate");
chart.setTitleOverlay(false);
chart.getFormattedTitle().getParagraph(0).addDefaultRunProperties().setFontSize(20d);
// category axis
XDDFCategoryAxis catAxis = chart.createCategoryAxis(AxisPosition.BOTTOM);
XDDFTitle title = getOrSetAxisTitle(catAxis);
title.setOverlay(false);
title.setText("Client Name");
title.getBody().getParagraph(0).addDefaultRunProperties().setFontSize(12d);
// value axis
XDDFValueAxis valAxis = chart.createValueAxis(AxisPosition.LEFT);
title = getOrSetAxisTitle(valAxis);
title.setOverlay(false);
title.setText("Value (Percentage)");
title.getBody().getParagraph(0).addDefaultRunProperties().setFontSize(12d);
// cross axes
valAxis.setCrosses(AxisCrosses.AUTO_ZERO);
valAxis.setCrossBetween(AxisCrossBetween.BETWEEN);
// chart data
XDDFChartData data = chart.createData(ChartTypes.BAR, catAxis, valAxis);
// series
XDDFChartData.Series series1 = data.addSeries(xs, ys1);
series1.setTitle("Series 1", null); // there must be a series title even if no legend is needed
// add data labels
setDataLabels(series1, 7, true); // pos 7 = INT_OUT_END, showVal = true
// plot chart
chart.plot(data);
// in order to transform a bar chart into a column chart, you just need to change the bar direction
XDDFBarChartData bar = (XDDFBarChartData) data;
// bar.setBarDirection(BarDirection.COL);
// set series fill color
solidFillSeries(data, 0, PresetColor.BLUE);
// Write the output to a file
try (FileOutputStream fileOut = new FileOutputStream("./ooxml-bar-chart.xlsx")) {
wb.write(fileOut);
}
}
}
private static void solidFillSeries(XDDFChartData data, int index, PresetColor color) {
XDDFSolidFillProperties fill = new XDDFSolidFillProperties(XDDFColor.from(color));
XDDFChartData.Series series = data.getSeries(index);
XDDFShapeProperties properties = series.getShapeProperties();
if (properties == null) {
properties = new XDDFShapeProperties();
}
properties.setFillProperties(fill);
series.setShapeProperties(properties);
}
private static XDDFTitle getOrSetAxisTitle(XDDFValueAxis axis) {
try {
java.lang.reflect.Field _ctValAx = XDDFValueAxis.class.getDeclaredField("ctValAx");
_ctValAx.setAccessible(true);
org.openxmlformats.schemas.drawingml.x2006.chart.CTValAx ctValAx =
(org.openxmlformats.schemas.drawingml.x2006.chart.CTValAx)_ctValAx.get(axis);
if (!ctValAx.isSetTitle()) {
ctValAx.addNewTitle();
}
XDDFTitle title = new XDDFTitle(null, ctValAx.getTitle());
return title;
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
private static XDDFTitle getOrSetAxisTitle(XDDFCategoryAxis axis) {
try {
java.lang.reflect.Field _ctCatAx = XDDFCategoryAxis.class.getDeclaredField("ctCatAx");
_ctCatAx.setAccessible(true);
org.openxmlformats.schemas.drawingml.x2006.chart.CTCatAx ctCatAx =
(org.openxmlformats.schemas.drawingml.x2006.chart.CTCatAx)_ctCatAx.get(axis);
if (!ctCatAx.isSetTitle()) {
ctCatAx.addNewTitle();
}
XDDFTitle title = new XDDFTitle(null, ctCatAx.getTitle());
return title;
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
private static void setDataLabels(XDDFChartData.Series series, int pos, boolean... show) {
/*
INT_BEST_FIT 1
INT_B 2
INT_CTR 3
INT_IN_BASE 4
INT_IN_END 5
INT_L 6
INT_OUT_END 7
INT_R 8
INT_T 9
*/
try {
org.openxmlformats.schemas.drawingml.x2006.chart.CTDLbls ctDLbls = null;
if (series instanceof XDDFBarChartData.Series) {
java.lang.reflect.Field _ctBarSer = XDDFBarChartData.Series.class.getDeclaredField("series");
_ctBarSer.setAccessible(true);
org.openxmlformats.schemas.drawingml.x2006.chart.CTBarSer ctBarSer =
(org.openxmlformats.schemas.drawingml.x2006.chart.CTBarSer)_ctBarSer.get((XDDFBarChartData.Series)series);
if (ctBarSer.isSetDLbls()) ctBarSer.unsetDLbls();
ctDLbls = ctBarSer.addNewDLbls();
if (!(pos == 3 || pos == 4 || pos == 5 || pos == 7)) pos = 3; // bar chart does not provide other pos
ctDLbls.addNewDLblPos().setVal(org.openxmlformats.schemas.drawingml.x2006.chart.STDLblPos.Enum.forInt(pos));
} else if (series instanceof XDDFLineChartData.Series) {
java.lang.reflect.Field _ctLineSer = XDDFLineChartData.Series.class.getDeclaredField("series");
_ctLineSer.setAccessible(true);
org.openxmlformats.schemas.drawingml.x2006.chart.CTLineSer ctLineSer =
(org.openxmlformats.schemas.drawingml.x2006.chart.CTLineSer)_ctLineSer.get((XDDFLineChartData.Series)series);
if (ctLineSer.isSetDLbls()) ctLineSer.unsetDLbls();
ctDLbls = ctLineSer.addNewDLbls();
if (!(pos == 3 || pos == 6 || pos == 8 || pos == 9 || pos == 2)) pos = 3; // line chart does not provide other pos
ctDLbls.addNewDLblPos().setVal(org.openxmlformats.schemas.drawingml.x2006.chart.STDLblPos.Enum.forInt(pos));
} else if (series instanceof XDDFPieChartData.Series) {
java.lang.reflect.Field _ctPieSer = XDDFPieChartData.Series.class.getDeclaredField("series");
_ctPieSer.setAccessible(true);
org.openxmlformats.schemas.drawingml.x2006.chart.CTPieSer ctPieSer =
(org.openxmlformats.schemas.drawingml.x2006.chart.CTPieSer)_ctPieSer.get((XDDFPieChartData.Series)series);
if (ctPieSer.isSetDLbls()) ctPieSer.unsetDLbls();
ctDLbls = ctPieSer.addNewDLbls();
if (!(pos == 3 || pos == 1 || pos == 4 || pos == 5)) pos = 3; // pie chart does not provide other pos
ctDLbls.addNewDLblPos().setVal(org.openxmlformats.schemas.drawingml.x2006.chart.STDLblPos.Enum.forInt(pos));
}// else if ...
if (ctDLbls != null) {
ctDLbls.addNewShowVal().setVal((show.length>0)?show[0]:false);
ctDLbls.addNewShowLegendKey().setVal((show.length>1)?show[1]:false);
ctDLbls.addNewShowCatName().setVal((show.length>2)?show[2]:false);
ctDLbls.addNewShowSerName().setVal((show.length>3)?show[3]:false);
ctDLbls.addNewShowPercent().setVal((show.length>4)?show[4]:false);
ctDLbls.addNewShowBubbleSize().setVal((show.length>5)?show[5]:false);
ctDLbls.addNewShowLeaderLines().setVal((show.length>6)?show[8]:false);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
结果：