Apache POI supports only ScatterCharts and LineCharts why?

问题

I see that only LineChart and Scatter Charts are supported by default with Apache POI.

Question: How can we add Other Chart types in spreadhsheet..

Any Idea or any help on this? or Is there Any reason for apache supporting only these two types of charts.

回答1:

Apache poi provides poi-ooxml-schemas also. This are the underlying objects for XML based office documents. So one can try solving his requirements directly with those objects as long as they are not provided at higher level. The problem is the documentation of those objects. As far as I know there is none. But there is http://grepcode.com/snapshot/repo1.maven.org/maven2/org.apache.poi/ooxml-schemas/1.1/.

So coming from the XSSFChart from the existing chart examples we can get CTChart and then using http://grepcode.com/file/repo1.maven.org/maven2/org.apache.poi/ooxml-schemas/1.1/org/openxmlformats/schemas/drawingml/x2006/chart/CTChart.java#CTChart shimmy up from object to object.

It is helpful to create a simple *.xlsx file first directly with Excel and have a look at its XML content. There we can get hints what objects are needed. For this we can unzip the *.xlsx simply with a ZIP software.

In this example create a workbook with one sheet and the simplest possible pie chart in Excel. Unzip the *.xlsx and look at /xl/charts/chart1.xml.

Example Pie Chart:

import java.io.FileOutputStream;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
import org.apache.poi.ss.usermodel.charts.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFChart;

import org.openxmlformats.schemas.drawingml.x2006.chart.CTChart;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTPlotArea;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTPieChart;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTBoolean;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTPieSer;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTAxDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumDataSource;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumRef;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTStrRef;


public class PieChart {

    public static void main(String[] args) throws Exception {
        Workbook wb = new XSSFWorkbook();
        Sheet sheet = wb.createSheet("Sheet1");

        Row row;
        Cell cell;
        for (int r = 0; r < 3; r++) {
            row = sheet.createRow(r);
            cell = row.createCell(0);
            cell.setCellValue("S" + r);
            cell = row.createCell(1);
            cell.setCellValue(r+1);
        }

        Drawing drawing = sheet.createDrawingPatriarch();
        ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 5, 20);

        Chart chart = drawing.createChart(anchor);

        CTChart ctChart = ((XSSFChart)chart).getCTChart();
        CTPlotArea ctPlotArea = ctChart.getPlotArea();
        CTPieChart ctPieChart = ctPlotArea.addNewPieChart();
        CTBoolean ctBoolean = ctPieChart.addNewVaryColors();
        ctBoolean.setVal(true);
        CTPieSer ctPieSer = ctPieChart.addNewSer();

        ctPieSer.addNewIdx().setVal(0);     

        CTAxDataSource cttAxDataSource = ctPieSer.addNewCat();
        CTStrRef ctStrRef = cttAxDataSource.addNewStrRef();
        ctStrRef.setF("Sheet1!$A$1:$A$3"); 
        CTNumDataSource ctNumDataSource = ctPieSer.addNewVal();
        CTNumRef ctNumRef = ctNumDataSource.addNewNumRef();
        ctNumRef.setF("Sheet1!$B$1:$B$3"); 

System.out.println(ctChart);

        FileOutputStream fileOut = new FileOutputStream("workbook.xlsx");
        wb.write(fileOut);
        fileOut.close();
    }
}

Disclaimer: tested with Excel 2007, works not with Libreoffice and Openoffice.

This example needs the full jar of all of the schemas ooxml-schemas-1.3.jar as mentioned in the FAQ-N10025.

To make this working using apache poi 4.1.0 following needs to be changed:

...
import java.io.FileOutputStream;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
//import org.apache.poi.ss.usermodel.charts.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFChart;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
...
        XSSFDrawing drawing = (XSSFDrawing)sheet.createDrawingPatriarch();
        ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 5, 20);

        XSSFChart chart = drawing.createChart(anchor);
...

And it then needs the full jar of all of the schemas ooxml-schemas-1.4.jar.

回答2:

following Create Bar Chart in Excel with Apache POI more closely I get this which gives a raw result for pie charts which displays in librecalc

public static void pieChart(SXSSFSheet sheet) {
    Row row;
    Cell cell;
    for (int r = 0; r < 3; r++) {
       row = sheet.createRow(r);
       cell = row.createCell(0);
       cell.setCellValue("S" + r);
       cell = row.createCell(1);
       cell.setCellValue(r+1);
   }

   Drawing drawing = sheet.createDrawingPatriarch();
   ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 5, 20);

   Chart chart = drawing.createChart(anchor);

   CTChart ctChart = ((XSSFChart)chart).getCTChart();
   CTPlotArea ctPlotArea = ctChart.getPlotArea();
   CTPieChart ctPieChart = ctPlotArea.addNewPieChart();
   CTBoolean ctBoolean = ctPieChart.addNewVaryColors();   
   ctBoolean.setVal(true);


   for (int r = 1; r < 4; r++) {
       CTPieSer ctPieSer = ctPieChart.addNewSer();
       CTSerTx ctSerTx = ctPieSer.addNewTx();
       CTStrRef ctStrRef = ctSerTx.addNewStrRef();
       ctStrRef.setF("Sheet1!$A$" + r);
       ctPieSer.addNewIdx().setVal(r-2);
       CTAxDataSource cttAxDataSource = ctPieSer.addNewCat();
       ctStrRef = cttAxDataSource.addNewStrRef();
       ctStrRef.setF("Sheet1!$A$1:$A$3");
       CTNumDataSource ctNumDataSource = ctPieSer.addNewVal();
       CTNumRef ctNumRef = ctNumDataSource.addNewNumRef();
       ctNumRef.setF("Sheet1!$B$1:$B$3");

    //at least the border lines in Libreoffice Calc ;-)

 ctPieSer.addNewSpPr().addNewLn().addNewSolidFill().addNewSrgbClr().setVal(new byte[] {0,0,0});
    }
}

ubuntu 16.04 / POI 3.17 / jdk 8

回答3:

Starting with Apache POI 4.0.0, the LineChart and ScatterChart from XSSF have been moved to a new XDDF component where BarChart and PieChart from XSLF have been moved too. Based on the new framework for charts, the RadarChart has been implemented. These five chart types are now available from XSSF (xslx spreadsheets), XSLF (pptx slides) and XWPF (docx documents).

It seems to be now easier to implement the missing chart types like AreaChart, BubbleChart or SurfaceChart. The 3D variants might require some additional dedication to get implemented. Finally the new chart types like SunBurstChart or TreeMapChart require implementation of a whole brand new part called "chartex".

来源：https://stackoverflow.com/questions/34718734/apache-poi-supports-only-scattercharts-and-linecharts-why

标签

java

excel

charts

apache-poi