Desde un Servlet realizamos la impresión en formato PNG.
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/**/
response.setContentType("image/png");
OutputStream out = response.getOutputStream();
//Obtenemos el grafico
//JFreeChart grafico01 = this.dibujarGrafico01();
//JFreeChart grafico02 = this.dibujarGrafico02();
JFreeChart grafico03 = this.dibujarGrafico03();
ChartUtilities.writeChartAsPNG(out, grafico03, 800, 600);
out.close();
/**/
}
public JFreeChart dibujarGrafico02(){
// create a dataset...
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
//Saldos A
for (int i = 1; i <= 24; i++) {
dataset.addValue(i+1, "A", "Mes " + i);
}
//Saldos B
for (int i = 1; i <= 24; i++) {
dataset.addValue(i+2, "B", "Mes " + i);
}
//Saldos C
for (int i = 1; i <= 24; i++) {
dataset.addValue(i+3, "C", "Mes " + i);
}
//Saldos D
for (int i = 1; i <= 24; i++) {
dataset.addValue(i+4, "D", "Mes " + i);
}
// create a chart...
JFreeChart chart = ChartFactory.createBarChart(
"Bar Chart Demo - AprendeJAVA", // chart title
"Meses", // domain axis label
"Valor", // range axis label
dataset, // data
PlotOrientation.VERTICAL, // orientation
true, // include legend
true, // tooltips?
false // URLs?
);
// chart Customisation
chart.setBackgroundPaint(Color.white);
CategoryPlot plot = (CategoryPlot) chart.getPlot();
plot.setBackgroundPaint(Color.lightGray);
plot.setRangeGridlinePaint(Color.white);
//Indicar el label vertical
final CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
// Color de las barras
BarRenderer renderer = (BarRenderer) plot.getRenderer();
renderer.setSeriesPaint(0, Color.GRAY); //Saldos A
renderer.setSeriesPaint(1, Color.ORANGE); //Saldos B
renderer.setSeriesPaint(1, Color.BLUE); //Saldos B
renderer.setSeriesPaint(1, Color.GREEN); //Saldos B
renderer.setDrawBarOutline(true); //Borde a las barras
// Bar Spacing Within Categories
renderer.setItemMargin(-0.5);
return chart;
}
public JFreeChart dibujarGrafico03(){
/*==============================================================*/
// create a dataset...
DefaultCategoryDataset dataset1 = new DefaultCategoryDataset();
//Saldos A
for (int i = 1; i <= 24; i++) {
dataset1.addValue(i+5, "A", "Mes " + i);
}
//Saldos B
for (int i = 1; i <= 24; i++) {
dataset1.addValue(i+2, "B", "Mes " + i);
}
// create the first renderer...
final CategoryItemRenderer renderer = new BarRenderer();
final CategoryPlot plot = new CategoryPlot();
plot.setDataset(dataset1);
plot.setRenderer(renderer);
plot.setDomainAxis(new CategoryAxis("Eje X"));
plot.setRangeAxis(new NumberAxis("Eje Y"));
plot.setOrientation(PlotOrientation.VERTICAL);
plot.setRangeGridlinesVisible(true);
plot.setDomainGridlinesVisible(true);
/*==============================================================*/
// create dataset T1
DefaultCategoryDataset datasetT1 = new DefaultCategoryDataset();
//Tipo T1
for (int i = 1; i <= 24; i++) {
datasetT1.addValue(i+4.12, "T1", "Mes " + i);
}
// create dataset T2
DefaultCategoryDataset datasetT2 = new DefaultCategoryDataset();
//Tipo T2
for (int i = 1; i <= 24; i++) {
datasetT2.addValue(i+2.5, "T2", "Mes " + i);
}
DefaultCategoryDataset datasetT3 = new DefaultCategoryDataset();
//Tipo T3
for (int i = 1; i <= 24; i++) {
datasetT3.addValue(i+1.8, "T3", "Mes " + i);
}
DefaultCategoryDataset datasetT4 = new DefaultCategoryDataset();
//Tipo T4
for (int i = 1; i <= 24; i++) {
datasetT4.addValue(i+3.5, "T4", "Mes " + i);
}
// Seteamos DATA para el eje Y derecha
plot.setDataset(1, datasetT1);
plot.setDataset(2, datasetT2);
plot.setDataset(3, datasetT3);
plot.setDataset(4, datasetT4);
final CategoryItemRenderer rendererT1 = new LineAndShapeRenderer();
plot.setRenderer(1, rendererT1);
final CategoryItemRenderer rendererT2 = new LineAndShapeRenderer();
plot.setRenderer(2, rendererT2);
final CategoryItemRenderer rendererT3 = new LineAndShapeRenderer();
plot.setRenderer(3, rendererT3);
final CategoryItemRenderer rendererT4 = new LineAndShapeRenderer();
plot.setRenderer(4, rendererT4);
//Creamos un eje a la derecha
final ValueAxis rangeAxis2 = new NumberAxis("Eje M");
plot.setRangeAxis(1, rangeAxis2);
plot.mapDatasetToRangeAxis(2, 1);
plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD);
plot.getDomainAxis().setCategoryLabelPositions(CategoryLabelPositions.UP_90);
// Color de las barras
BarRenderer rendererABC = (BarRenderer) plot.getRenderer();
rendererABC.setSeriesPaint(0, Color.GRAY); //Saldos A
rendererABC.setSeriesPaint(1, Color.ORANGE); //Saldos B
rendererABC.setDrawBarOutline(true); //Borde a las barras
rendererABC.setItemMargin(-1);
final JFreeChart chart = new JFreeChart(plot);
chart.setTitle("Overlaid Bar Chart - AprendeJAVA");
/*==============================================================*/
return chart;
}
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