使用POI结合Excel的行列生成原生散点图(XY图)
一、先放最后输出的结果图：
雷达图
二、代码
@Test
public void createScatterChart() throws IOException {
XSSFWorkbook wb = new XSSFWorkbook();
XSSFSheet sheet = wb.createSheet("散点图");
Row row;
Cell cell;
for (int r = 0; r < 105; r++) {
row = sheet.createRow(r);
cell = row.createCell(0);
cell.setCellValue("S" + r);
cell = row.createCell(1);
cell.setCellValue(RandomUtils.nextInt(1,100));
}
XSSFDrawing drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 0, 21, 40);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("预选赛项目得分分布图");
chart.setAutoTitleDeleted(false);
CTChart ctChart = chart.getCTChart();
ctChart.addNewPlotVisOnly().setVal(true);
ctChart.addNewDispBlanksAs().setVal(STDispBlanksAs.Enum.forInt(2));
ctChart.addNewShowDLblsOverMax().setVal(false);
// 创建一个散点图
CTPlotArea ctPlotArea = ctChart.getPlotArea();
CTScatterChart scatterChart = ctPlotArea.addNewScatterChart();
scatterChart.addNewScatterStyle().setVal(STScatterStyle.LINE_MARKER);
scatterChart.addNewVaryColors().setVal(false); // 不允许自定义颜色
scatterChart.addNewAxId().setVal(123456);
scatterChart.addNewAxId().setVal(123457);
CTCatAx ctCatAx = ctPlotArea.addNewCatAx();
ctCatAx.addNewAxId().setVal(123456);
CTScaling ctScaling = ctCatAx.addNewScaling();
ctScaling.addNewOrientation().setVal(MIN_MAX);
ctCatAx.addNewDelete().setVal(false);
ctCatAx.addNewAxPos().setVal(STAxPos.B);
ctCatAx.addNewCrossAx().setVal(123457);
ctCatAx.addNewTickLblPos().setVal(NEXT_TO);
// 设置Y坐标
CTValAx ctValAx = ctPlotArea.addNewValAx();
ctValAx.addNewAxId().setVal(123457);
CTScaling ctScaling1 = ctValAx.addNewScaling();
ctScaling1.addNewOrientation().setVal(MIN_MAX);
ctValAx.addNewDelete().setVal(false);
ctValAx.addNewAxPos().setVal(STAxPos.B);
ctValAx.addNewCrossAx().setVal(123456);
// Y轴的对比线
CTShapeProperties ctShapeProperties = ctValAx.addNewMajorGridlines().addNewSpPr();
CTLineProperties ctLineProperties = ctShapeProperties.addNewLn();
ctLineProperties.setW(9525);
ctLineProperties.setCap(STLineCap.Enum.forInt(3));
ctLineProperties.setCmpd(STCompoundLine.Enum.forInt(1));
ctLineProperties.setAlgn(STPenAlignment.Enum.forInt(1));
// 不显示Y轴上的坐标刻度线
ctValAx.addNewMajorTickMark().setVal(STTickMark.NONE);
ctValAx.addNewMinorTickMark().setVal(STTickMark.NONE);
ctValAx.addNewTickLblPos().setVal(NEXT_TO);
// 设置散点图内的信息
CTScatterSer ctScatterSer = scatterChart.addNewSer();
ctScatterSer.addNewIdx().setVal(0);
ctScatterSer.addNewOrder().setVal(0);
// 去掉连接线
ctPlotArea.getScatterChartArray(0).getSerArray(0).addNewSpPr().addNewLn().addNewNoFill();
// 设置散点图各图例的显示
CTDLbls ctdLbls = scatterChart.addNewDLbls();
ctdLbls.addNewShowVal().setVal(true);
ctdLbls.addNewShowLegendKey().setVal(false);
ctdLbls.addNewShowSerName().setVal(false);
ctdLbls.addNewShowCatName().setVal(false);
ctdLbls.addNewShowPercent().setVal(false);
ctdLbls.addNewShowBubbleSize().setVal(false);
// 设置标记的样式
CTMarker ctMarker = ctScatterSer.addNewMarker();
ctMarker.addNewSymbol().setVal(STMarkerStyle.Enum.forInt(3));
ctMarker.addNewSize().setVal((short) 5);
CTShapeProperties ctShapeProperties1 = ctMarker.addNewSpPr();
ctShapeProperties1.addNewSolidFill().addNewSchemeClr().setVal(STSchemeColorVal.Enum.forInt(5));
CTLineProperties ctLineProperties1 = ctShapeProperties1.addNewLn();
ctLineProperties1.setW(9525);
ctLineProperties1.addNewSolidFill().addNewSchemeClr().setVal(STSchemeColorVal.Enum.forInt(5));
CTAxDataSource ctAxDataSource = ctScatterSer.addNewXVal();
CTStrRef ctStrRef = ctAxDataSource.addNewStrRef();
ctStrRef.setF("散点图!$A$1:$A$100");
CTNumDataSource ctNumDataSource = ctScatterSer.addNewYVal();
CTNumRef ctNumRef = ctNumDataSource.addNewNumRef();
ctNumRef.setF("散点图!$B$1:$B$100");
System.out.println(ctChart);
FileOutputStream fileOut = new FileOutputStream("C:\\Users\\user\\Desktop\\out.xlsx");
wb.write(fileOut);
fileOut.close();
}
三、XML结构
以上生成的图表，归根结底是属于XML的一种，通过 Chart 的继承关系可以看到，它其实是 XmlObject的一种实现。
预选赛项目得分分布图
散点图!$A$1:$A$100
散点图!$B$1:$B$100