com.crunchify.jsp.servlet.ChartServlet.java Source code

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Here is the source code for com.crunchify.jsp.servlet.ChartServlet.java

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package com.crunchify.jsp.servlet;

import java.awt.BasicStroke;
import java.awt.Color;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

public class ChartServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setContentType("image/png");
        OutputStream outputStream = response.getOutputStream();
        JFreeChart chart = getChart();
        int width = 500;
        int height = 350;
        ChartUtilities.writeChartAsPNG(outputStream, chart, width, height);

    }

    public JFreeChart getChart() {

        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.addValue(25.0, "Series 1", "Category 1");
        dataset.addValue(34.0, "Series 1", "Category 2");
        dataset.addValue(19.0, "Series 2", "Category 1");
        dataset.addValue(29.0, "Series 2", "Category 2");
        dataset.addValue(41.0, "Series 3", "Category 1");
        dataset.addValue(33.0, "Series 3", "Category 2");

        JFreeChart chart = ChartFactory.createBarChart3D("3D Bar Chart Demo", // chart title
                "Category", // domain axis label
                "Value", // range axis label
                dataset, // data
                PlotOrientation.VERTICAL, // orientation
                true, // include legend
                true, // tooltips
                false // urls
        );

        CategoryPlot plot = chart.getCategoryPlot();
        CategoryAxis axis = plot.getDomainAxis();
        axis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 8.0));

        CategoryItemRenderer renderer = plot.getRenderer();
        renderer.setItemLabelsVisible(true);
        BarRenderer r = (BarRenderer) renderer;
        r.setMaximumBarWidth(0.05);
        return chart;

    }

}