JasperReport经验谈

            categoryDs.addValue(dataValue, null, (String) periods.get(i));
        }

        JFreeChart c = null;

        if (isBarChart)
        {
            c = ChartFactory.createBarChart(chartName, titleX, titleY, categoryDs,
                    PlotOrientation.VERTICAL, false, false, false);
        }
        else
        {
            c = ChartFactory.createLineChart(chartName, titleX, titleY, categoryDs,
                    PlotOrientation.VERTICAL, false, false, false);
        }

        c.getTitle().setFont(new Font("Arial", Font.BOLD, 16));

        NumberAxis axis = (NumberAxis) c.getCategoryPlot().getRangeAxis();
        axis.setAutoRange(true);

        TickUnitSource tickUnits = NumberAxis.createIntegerTickUnits();
        axis.setStandardTickUnits(tickUnits);

        return (c.createBufferedImage(imageWidth, imageHeight));

       }
}

（出处：清风学院）