Java tutorial
/** * Copyright 2011 Marco Berri - marcoberri@gmail.com * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. * */ package it.marcoberri.mbmeteo.action.chart; import it.marcoberri.mbmeteo.helper.ChartEnumMinMaxHelper; import it.marcoberri.mbmeteo.model.Meteolog; import it.marcoberri.mbmeteo.utils.Default; import java.awt.Font; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import java.util.HashMap; import javax.servlet.ServletException; 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.PiePlot; import org.jfree.data.general.DefaultPieDataset; /** * * @author Marco Berri <marcoberri@gmail.com> */ public class GetLastUPie extends Base { /** * 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 */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { log.debug("start : " + this.getClass().getName()); final HashMap<String, String> params = getParams(request.getParameterMap()); final Integer dimy = Default.toInteger(params.get("dimy"), 600); final Integer dimx = Default.toInteger(params.get("dimx"), 800); Meteolog meteolog = ds.find(Meteolog.class).order("-time").limit(1).get(); final DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue(ChartEnumMinMaxHelper.outdoorHumidityMin.getUm(), meteolog.getOutdoorHumidity()); dataset.setValue("", 100 - meteolog.getOutdoorHumidity()); JFreeChart chart = ChartFactory.createPieChart("Humidity %", // chart title dataset, // data true, // include legend true, false); PiePlot plot = (PiePlot) chart.getPlot(); plot.setLabelFont(new Font("SansSerif", Font.PLAIN, 12)); plot.setNoDataMessage("No data available"); plot.setCircular(false); plot.setLabelGap(0.02); final File f = File.createTempFile("mbmeteo", ".jpg"); ChartUtilities.saveChartAsJPEG(f, chart, dimx, dimy); response.setContentType("image/jpeg"); response.setHeader("Content-Length", "" + f.length()); response.setHeader("Content-Disposition", "inline; filename=\"" + f.getName() + "\""); final OutputStream out = response.getOutputStream(); final FileInputStream in = new FileInputStream(f.toString()); final int size = in.available(); final byte[] content = new byte[size]; in.read(content); out.write(content); in.close(); out.close(); } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP * <code>GET</code> method. * * @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 { processRequest(request, response); } /** * Handles the HTTP * <code>POST</code> method. * * @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 doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } }