Servlets.servletGraficas.java Source code

Introduction

Here is the source code for Servlets.servletGraficas.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Servlets;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;

/**
 *
 * @author David
 */
public class servletGraficas extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        String SITIO_1 = "prueba 1";
        String SITIO_2 = "prueba 2";
        // Visitas del sitio web 1
        dataset.setValue(100, SITIO_1, "Lunes");
        dataset.setValue(120, SITIO_1, "Martes");
        dataset.setValue(110, SITIO_1, "Mircoles");
        dataset.setValue(103, SITIO_1, "Jueves");
        dataset.setValue(106, SITIO_1, "Viernes");

        // Visitas del sitio web 2
        dataset.setValue(60, SITIO_2, "Lunes");
        dataset.setValue(62, SITIO_2, "Martes");
        dataset.setValue(61, SITIO_2, "Mircoles");
        dataset.setValue(63, SITIO_2, "Jueves");
        dataset.setValue(66, SITIO_2, "Viernes");
        JFreeChart chart = ChartFactory.createBarChart3D("Aspirantes", "", "Nmero visitas", dataset,
                PlotOrientation.VERTICAL, true, true, false);
        try {
            File image = File.createTempFile("image", "tmp");

            // Assume that we have the chart
            ChartUtilities.saveChartAsPNG(image, chart, 500, 300);

            FileInputStream fileInStream = new FileInputStream(image);
            OutputStream outStream = response.getOutputStream();

            long fileLength;
            byte[] byteStream;

            fileLength = image.length();
            byteStream = new byte[(int) fileLength];
            fileInStream.read(byteStream, 0, (int) fileLength);

            response.setContentType("image/png");
            response.setContentLength((int) fileLength);
            response.setHeader("Cache-Control", "no-store,no-cache, must-revalidate, post-check=0, pre-check=0");
            response.setHeader("Pragma", "no-cache");

            fileInStream.close();
            outStream.write(byteStream);
            outStream.flush();
            outStream.close();

        } catch (IOException e) {
            System.err.println("Problem occurred creating chart.");
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}