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/**
* Example Spring Controller for creating JFreeChart charts
*/
@Controller
public class DemoChartController {
 
  @RequestMapping("/demo-chart.png")
  public void renderChart(String variation, OutputStream stream) throws Exception {
    boolean rotate = "rotate".equals(variation); // add ?variation=rotate to the URL to rotate the chart
    JFreeChart chart = generateChart(rotate);
    ChartUtilities.writeChartAsPNG(stream, chart, 750, 400);
  }
 
  private JFreeChart generateChart(boolean rotate){
    DefaultCategoryDataset data = getDataset();
    return ChartFactory.createBarChart( "example graph", // title
        "x-axis",  // x-axis label
        "y-axis",  // y-axis label
        data,
        rotate ? PlotOrientation.HORIZONTAL : PlotOrientation.VERTICAL,
        true,      // legend displayed
        true,      // tooltips displayed
        false );   // no URLs*/
  }
 
}

    private static final SimpleDateFormat dateFormatter = new SimpleDateFormat("dd MMM");
    private DataSource dataSource;
 
    private DefaultCategoryDataset getDataset(){
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        // Run the SQL query and add the results to the JFreeChart dataset
 
        for (Object o : getQueryResults()){
 
            Map result = (Map) o;
            Number count = (Number) result.get("count");
            String category = (String) result.get("categoryName");
            String day = dateFormatter.format((Timestamp) result.get("day"));
            dataset.addValue(count, category, day);
        }
        return dataset;
    }
 
    private List getQueryResults(){
        // Use Spring's JdbcTemplate to run the SQL query
        // Also see JFreeChart's JDBCCategoryDataset
        return (new JdbcTemplate(dataSource)).queryForList(
                "select count(id) count, categoryName, trunc(mydate) as day\n" +
                        "from myTable\n" +
                        "where mydate > sysdate - 14\n" +
                        "group by categoryName, trunc(mydate)"
        );
    }
 
    @Autowired
    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    private static JFreeChart createChart(DefaultCategoryDataset dataset){
        ValueAxis valueAxis = new NumberAxis("Value");
 
        CategoryAxis categoryAxis = new CategoryAxis("Day");
        categoryAxis.setLowerMargin(0.01d); // indent first bar
        categoryAxis.setUpperMargin(0.01d); // indent last bar
        categoryAxis.setCategoryMargin(0.1d); // space between categories
 
        BarRenderer renderer = new StackedBarRenderer();
        renderer.setItemMargin(0d); // remove space between items
        CategoryPlot categoryPlot = new CategoryPlot(dataset, categoryAxis, valueAxis, renderer);
 
        // change the colours of the bars
        GradientPaint gradient1 =
                new GradientPaint( 0.0f, 0.0f, new Color(51, 104, 155, 196),
                        0.0f, 0.0f, new Color(51, 104, 155, 64) );
        GradientPaint gradient2 =
                new GradientPaint( 0.0f, 0.0f, new Color(0, 140, 208, 196),
                        0.0f, 0.0f, new Color(0, 140, 208, 64) );
        categoryPlot.getRenderer(0).setSeriesPaint(0, gradient1);
        categoryPlot.getRenderer(0).setSeriesPaint(1, gradient2);
 
        // bring it all together
        return new JFreeChart("Bar Chart Demo",
                new Font("Helvetica", Font.BOLD, 12),
                categoryPlot,
                false);
    }