Apache POI生成excel图表

Question

Sheets("Sheet 1").ChartObjects("Line Chart")
.Chart.Axes(xlValue).MaximumScale = Sheets("Sheet 1").Range("A37")

Answer 1

当前最新稳定版本Apache poi 3.17的答案。注XSSFChart正在开发中。所以我们应该在以后的版本中使用XDDFChart。

您可以通过xssfdrawing.getcharts从工作表的绘图中获取XSSFCharts的列表。从列表中获取所需的XSSFChart。然后通过xssfChart.getAxis获取该图表的轴。然后从列表中获取适当的XSSFValueAxis。然后通过XSSFCharTaxis.SetMaximum更改其最大值。

示例：

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.xssf.usermodel.charts.*;

import java.io.FileInputStream;
import java.io.FileOutputStream;

class ReadAndWriteExcelXSSFChart {

 public static void main(String[] args) throws Exception {

  Workbook workbook = WorkbookFactory.create(new FileInputStream("WBWithLineChart.xlsm"));
  Sheet sheet = workbook.getSheetAt(0);

  Row row = sheet.getRow(36); if (row == null) row = sheet.createRow(36);
  Cell cell = row.getCell(0); if (cell == null) cell = row.createCell(0);

  cell.setCellValue(10);

  double valueA37 = cell.getNumericCellValue();

  Drawing drawing = sheet.getDrawingPatriarch();
  if (drawing instanceof XSSFDrawing) {
   for (XSSFChart chart : ((XSSFDrawing)drawing).getCharts()) {
System.out.println(chart.getPackagePart().getPartName().getName());
    if (chart.getPackagePart().getPartName().getName().endsWith("chart1.xml")) { //first chart in sheet
     for (XSSFChartAxis axis : chart.getAxis()) { //all axes
System.out.println(axis);
      if (axis instanceof XSSFValueAxis) { //value axis
       axis.setMaximum(valueA37); // maximum = same value as in A37
System.out.println(axis.getMaximum());
      }
     }
    }
   }
  }

  workbook.write(new FileOutputStream("WBWithLineChart.xlsm"));
  workbook.close();

 }
}