我是 Apache-poi 的新手,我正在开发一个 java 项目,使用 Apache-poi 将数据导出到 Excel 电子表格。目前我可以绘制具有固定值的饼图。
我需要用Apache POI
在java中创建一个饼图,使用列表中的系列的自定义值,而不从工作表中读取它。
我尝试过的示例代码如下。
import java.io.FileNotFoundException;
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 PieChartSecond {
public static void main(String[] args) throws FileNotFoundException, IOException {
try (XSSFWorkbook wb = new XSSFWorkbook()) {
XSSFSheet sheet = wb.createSheet("CountryPieChart");
// Create row and put some cells in it. Rows and cells are 0 based.
Row row = sheet.createRow((short) 0);
Cell cell = row.createCell((short) 0);
cell.setCellValue("Russia("+17098242+")"
);
cell = row.createCell((short) 1);
cell.setCellValue("Canada(" + 9984670 +")"
);
cell = row.createCell((short) 2);
cell.setCellValue("USA(" +9826675+")"
);
row = sheet.createRow((short) 1);
cell = row.createCell((short) 0);
cell.setCellValue(17098242);
cell = row.createCell((short) 1);
cell.setCellValue(9984670);
cell = row.createCell((short) 2);
cell.setCellValue(9826675);
XSSFDrawing drawing = sheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 4, 7, 20);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Countries");
chart.setTitleOverlay(false);
XDDFChartLegend legend = chart.getOrAddLegend();
legend.setPosition(LegendPosition.TOP_RIGHT);
XDDFDataSource<String> countries = XDDFDataSourcesFactory.fromStringCellRange(sheet,
new CellRangeAddress(0, 0, 0, 2));
XDDFNumericalDataSource<Double> values = XDDFDataSourcesFactory.fromNumericCellRange(sheet,
new CellRangeAddress(1, 1, 0, 2));
// XDDFChartData data = chart.createData(ChartTypes.PIE, null, null);
XDDFChartData data = new XDDFPieChartData(chart.getCTChart().getPlotArea().addNewPieChart());
data.setVaryColors(true);
data.setVaryColors(true);
data.addSeries(countries, values);
chart.plot(data);
// Write output to an excel file
try (FileOutputStream fileOut = new FileOutputStream("pie-chart-countries.xlsx")) {
wb.write(fileOut);
}
}
}
}
问题就在这里,我将值设置为工作表,然后将其提取到图表中。我不想创建一个表,我只是想直接将我的值作为列表插入(因为它可以动态更改)
即
我需要从 List<String>
获取它,而不是从单元格中获取值的下面几行国家(国家列表)& List<Double>
值并将其设置为 data.addSeries(countries, values)
XDDFDataSource<String> countries = XDDFDataSourcesFactory.fromStringCellRange(sheet,
new CellRangeAddress(0, 0, 0, 2));
XDDFNumericalDataSource<Double> values = XDDFDataSourcesFactory.fromNumericCellRange(sheet,
new CellRangeAddress(1, 1, 0, 2));
由于值随着 Db 的变化而不断变化,因此他们有什么方法可以实现这一目标。
最佳答案
XDDFDataSourcesFactory也提供从数组创建数据源。但这主要用于在 Word
或 PowerPoint
中创建图表,这些图表将其数据源保存在嵌入的 Excel
工作表中,该工作表是根据该数组在内部创建的,同时创建 XWPFChart
或 XSLFChart
。
电子表格中的 XSSFChart
应从工作表中的单元格获取其图表数据源。也许来自隐藏的工作表,但不是来自数组。
但这当然是可能的。
使用apache poi 4.1.1
的示例。
对于饼图:
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xddf.usermodel.*;
import org.apache.poi.xddf.usermodel.chart.*;
import org.apache.poi.xssf.usermodel.*;
public class PieChartFromArray {
public static void main(String[] args) throws IOException {
try (XSSFWorkbook wb = new XSSFWorkbook()) {
XSSFSheet sheet = wb.createSheet("barchart");
XSSFDrawing drawing = sheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 0, 6, 15);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Chart title");
chart.setTitleOverlay(false);
XDDFChartLegend legend = chart.getOrAddLegend();
legend.setPosition(LegendPosition.RIGHT);
XDDFDataSource<String> cat = XDDFDataSourcesFactory.fromArray(new String[]{"Russia","Canada","USA"});
XDDFNumericalDataSource<Double> val = XDDFDataSourcesFactory.fromArray(new Double[]{170d, 99d, 98d});
//XDDFChartData data = new XDDFPieChartData(chart.getCTChart().getPlotArea().addNewPieChart());
XDDFChartData data = chart.createData(ChartTypes.PIE, null, null);
data.setVaryColors(true);
XDDFChartData.Series series = data.addSeries(cat, val);
series.setTitle("Series", null);
chart.plot(data);
try (FileOutputStream fileOut = new FileOutputStream("ooxml-pie-chart.xlsx")) {
wb.write(fileOut);
}
}
}
}
对于条形图:
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xddf.usermodel.*;
import org.apache.poi.xddf.usermodel.chart.*;
import org.apache.poi.xssf.usermodel.*;
public class BarChartFromArray {
public static void main(String[] args) throws IOException {
try (XSSFWorkbook wb = new XSSFWorkbook()) {
XSSFSheet sheet = wb.createSheet("barchart");
XSSFDrawing drawing = sheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 0, 10, 15);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Chart title");
chart.setTitleOverlay(false);
XDDFCategoryAxis bottomAxis = chart.createCategoryAxis(AxisPosition.BOTTOM);
bottomAxis.setTitle("cat");
XDDFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);
leftAxis.setTitle("val");
leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);
leftAxis.setCrossBetween(AxisCrossBetween.BETWEEN);
XDDFDataSource<String> cat = XDDFDataSourcesFactory.fromArray(new String[]{"Russia","Canada","USA"});
XDDFNumericalDataSource<Double> val = XDDFDataSourcesFactory.fromArray(new Double[]{170d, 99d, 98d});
XDDFChartData data = chart.createData(ChartTypes.BAR, bottomAxis, leftAxis);
data.setVaryColors(false);
XDDFChartData.Series series = data.addSeries(cat, val);
series.setTitle("Series", null);
chart.plot(data);
XDDFBarChartData bar = (XDDFBarChartData) data;
bar.setBarDirection(BarDirection.COL);
try (FileOutputStream fileOut = new FileOutputStream("ooxml-bar-chart.xlsx")) {
wb.write(fileOut);
}
}
}
}
这些图表将其数据以字符串文字公式形式的数组保存。例如 ={"Russia","Canada","USA"}
和 ={170,99,98}
。这是一种糟糕的图表数据存储形式。 Google 表格甚至不会显示这样的图表,该图表不是从工作表而是从此类字符串文字公式获取数据。
所以不要这样做。而是将数据放在表格中。如果数据不可见,请将其放入隐藏工作表中。
示例如何将图表数据放入单独的工作表中,然后可以将其隐藏。此代码也使用 apache poi 4.1.1
。
对于饼图:
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.ss.util.CellReference;
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.xddf.usermodel.chart.ChartTypes;
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 {
String[] categories = new String[]{"Russia","Canada","USA"};
Double[] values = new Double[]{170d, 99d, 98d};
try (XSSFWorkbook wb = new XSSFWorkbook()) {
//the sheet for the chart
XSSFSheet chartSheet = wb.createSheet("piechart");
//the sheet for the data
XSSFSheet dataSheet = wb.createSheet("data");
//maybe hide the data sheet
//wb.setSheetHidden(1, true);
Row row;
Cell cell;
row = dataSheet.createRow(0);
cell = row.createCell(1); cell.setCellValue("Series");
for (int i = 1; i <= categories.length; i++) {
row = dataSheet.createRow(i);
cell = row.createCell(0); cell.setCellValue(categories[i-1]);
cell = row.createCell(1); cell.setCellValue(values[i-1]);
}
XSSFDrawing drawing = chartSheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 0, 6, 15);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Chart title");
chart.setTitleOverlay(false);
XDDFChartLegend legend = chart.getOrAddLegend();
legend.setPosition(LegendPosition.RIGHT);
XDDFDataSource<String> cat = XDDFDataSourcesFactory.fromStringCellRange(dataSheet,
new CellRangeAddress(1, categories.length, 0, 0));
XDDFNumericalDataSource<Double> val = XDDFDataSourcesFactory.fromNumericCellRange(dataSheet,
new CellRangeAddress(1, categories.length, 1, 1));
//XDDFChartData data = new XDDFPieChartData(chart.getCTChart().getPlotArea().addNewPieChart());
XDDFChartData data = chart.createData(ChartTypes.PIE, null, null);
data.setVaryColors(true);
XDDFChartData.Series series = data.addSeries(cat, val);
series.setTitle(dataSheet.getRow(0).getCell(1).getStringCellValue(), new CellReference(dataSheet.getRow(0).getCell(1)));
chart.plot(data);
// 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);
}
}
}
}
对于条形图:
import java.io.FileOutputStream;
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.ss.util.CellReference;
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.AxisPosition;
import org.apache.poi.xddf.usermodel.chart.AxisCrossBetween;
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.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 BarChart {
public static void main(String[] args) throws Exception {
String[] categories = new String[]{"Russia","Canada","USA"};
Double[] values = new Double[]{170d, 99d, 98d};
try (XSSFWorkbook wb = new XSSFWorkbook()) {
//the sheet for the chart
XSSFSheet chartSheet = wb.createSheet("barchart");
//the sheet for the data
XSSFSheet dataSheet = wb.createSheet("data");
//maybe hide the data sheet
//wb.setSheetHidden(1, true);
Row row;
Cell cell;
row = dataSheet.createRow(0);
cell = row.createCell(1); cell.setCellValue("Series");
for (int i = 1; i <= categories.length; i++) {
row = dataSheet.createRow(i);
cell = row.createCell(0); cell.setCellValue(categories[i-1]);
cell = row.createCell(1); cell.setCellValue(values[i-1]);
}
XSSFDrawing drawing = chartSheet.createDrawingPatriarch();
XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 0, 10, 15);
XSSFChart chart = drawing.createChart(anchor);
chart.setTitleText("Chart title");
chart.setTitleOverlay(false);
XDDFChartLegend legend = chart.getOrAddLegend();
legend.setPosition(LegendPosition.RIGHT);
XDDFCategoryAxis bottomAxis = chart.createCategoryAxis(AxisPosition.BOTTOM);
bottomAxis.setTitle("cat");
XDDFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);
leftAxis.setTitle("val");
leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);
leftAxis.setCrossBetween(AxisCrossBetween.BETWEEN);
XDDFDataSource<String> cat = XDDFDataSourcesFactory.fromStringCellRange(dataSheet,
new CellRangeAddress(1, categories.length, 0, 0));
XDDFNumericalDataSource<Double> val = XDDFDataSourcesFactory.fromNumericCellRange(dataSheet,
new CellRangeAddress(1, categories.length, 1, 1));
XDDFChartData data = chart.createData(ChartTypes.BAR, bottomAxis, leftAxis);
data.setVaryColors(false);
XDDFChartData.Series series = data.addSeries(cat, val);
series.setTitle(dataSheet.getRow(0).getCell(1).getStringCellValue(), new CellReference(dataSheet.getRow(0).getCell(1)));
solidFillSeries(series, PresetColor.BLUE);
chart.plot(data);
XDDFBarChartData bar = (XDDFBarChartData) data;
bar.setBarDirection(BarDirection.COL);
// 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);
try (FileOutputStream fileOut = new FileOutputStream("ooxml-bar-chart.xlsx")) {
wb.write(fileOut);
}
}
}
private static void solidFillSeries(XDDFChartData.Series series, PresetColor color) {
XDDFSolidFillProperties fill = new XDDFSolidFillProperties(XDDFColor.from(color));
XDDFShapeProperties properties = series.getShapeProperties();
if (properties == null) {
properties = new XDDFShapeProperties();
}
properties.setFillProperties(fill);
series.setShapeProperties(properties);
}
}
关于java - 如何使用 Apache POI 使用自定义列表中的 XDDFDataSource 值创建饼图和条形图,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60185057/