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 com.github.jmkgreen.morphia.query.Query; import com.mongodb.gridfs.GridFSDBFile; import com.mongodb.gridfs.GridFSInputFile; import it.marcoberri.mbmeteo.helper.ChartEnumHelper; import it.marcoberri.mbmeteo.helper.MongoConnectionHelper; import it.marcoberri.mbmeteo.model.Cache; import it.marcoberri.mbmeteo.model.Meteolog; import it.marcoberri.mbmeteo.utils.DateTimeUtil; import it.marcoberri.mbmeteo.utils.Default; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.bson.types.ObjectId; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.DateAxis; import org.jfree.chart.plot.XYPlot; import org.jfree.data.time.Millisecond; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; /** * * @author Marco Berri <marcoberri@gmail.com> */ public class Get 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); final String from = Default.toString(params.get("from") + " 00:00:00", "1970-01-01 00:00:00"); final String to = Default.toString(params.get("to") + " 23:59:00", "2030-01-01 23:59:00"); final String field = Default.toString(params.get("field"), "outdoorTemperature"); request.getSession().setAttribute("from", params.get("from")); request.getSession().setAttribute("to", params.get("to")); final String cacheKey = getCacheKey(params); if (cacheReadEnable) { final Query q = ds.find(Cache.class); q.filter("cacheKey", cacheKey).filter("servletName", this.getClass().getName()); final Cache c = (Cache) q.get(); if (c == null) { log.info("cacheKey:" + cacheKey + " on servletName: " + this.getClass().getName() + " not found"); } if (c != null) { log.debug("get file from cache id: " + c.getGridId()); final GridFSDBFile imageForOutput = MongoConnectionHelper.getGridFS() .findOne(new ObjectId(c.getGridId())); if (imageForOutput != null) { ds.save(c); try { response.setHeader("Content-Length", "" + imageForOutput.getLength()); response.setHeader("Content-Disposition", "inline; filename=\"" + imageForOutput.getFilename() + "\""); final OutputStream out = response.getOutputStream(); final InputStream in = imageForOutput.getInputStream(); final byte[] content = new byte[(int) imageForOutput.getLength()]; in.read(content); out.write(content); in.close(); out.close(); return; } catch (final IOException e) { log.error(e); } } else { log.error("file not in db"); } } } final String titleChart = ChartEnumHelper.getByName(field).getTitle(); final String umChart = ChartEnumHelper.getByName(field).getUm(); final Query q = ds.createQuery(Meteolog.class); final Date dFrom = DateTimeUtil.getDate("yyyy-MM-dd hh:mm:ss", from); final Date dTo = DateTimeUtil.getDate("yyyy-MM-dd hh:mm:ss", to); q.disableValidation().filter("time >=", dFrom).filter("time <=", dTo); final List<Meteolog> meteoLogList = q.asList(); final TimeSeries series = new TimeSeries(umChart); for (Meteolog m : meteoLogList) { final Millisecond t = new Millisecond(m.getTime()); try { //violenza di una reflection final Method method = m.getClass().getMethod(ChartEnumHelper.getByName(field).getMethod()); final Number n = (Number) method.invoke(m); series.add(t, n); } catch (final NoSuchMethodException ex) { log.error(ex); } catch (final InvocationTargetException ex) { log.error(ex); } catch (final IllegalAccessException ex) { log.error(ex); } catch (final SecurityException ex) { log.error(ex); } } final TimeSeriesCollection dataset = new TimeSeriesCollection(); dataset.addSeries(series); final JFreeChart chart = ChartFactory.createTimeSeriesChart(titleChart, "", umChart, dataset, false, false, false); final XYPlot plot = (XYPlot) chart.getPlot(); final DateAxis axis = (DateAxis) plot.getDomainAxis(); axis.setDateFormatOverride(new SimpleDateFormat("dd-MM-yyyy HH:mm")); axis.setVerticalTickLabels(true); if (field.toUpperCase().indexOf("PRESSURE") != -1) { plot.getRangeAxis().setRange(chartPressureMin, chartPressureMax); } final File f = File.createTempFile("mbmeteo", ".jpg"); ChartUtilities.saveChartAsJPEG(f, chart, dimx, dimy); try { if (cacheWriteEnable) { final GridFSInputFile gfsFile = MongoConnectionHelper.getGridFS().createFile(f); gfsFile.setFilename(f.getName()); gfsFile.save(); final Cache c = new Cache(); c.setServletName(this.getClass().getName()); c.setCacheKey(cacheKey); c.setGridId(gfsFile.getId().toString()); ds.save(c); } 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(); } catch (final IOException e) { log.error(e); } finally { f.delete(); } } // <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); } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }