Java tutorial
/** * Licensed under the GPL License. You may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html * * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE. */ package psiprobe.controllers; 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.PlotOrientation; import org.jfree.chart.renderer.xy.XYAreaRenderer; import org.jfree.chart.renderer.xy.XYLine3DRenderer; import org.jfree.data.xy.DefaultTableXYDataset; import org.jfree.ui.RectangleInsets; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.ServletRequestUtils; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.AbstractController; import psiprobe.Utils; import psiprobe.beans.stats.providers.SeriesProvider; import psiprobe.model.stats.StatsCollection; import java.awt.BasicStroke; import java.awt.Color; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Plots data from "statsCollection" bean. The data is converted to XYSeries using SeriesProvider, * name of which would be passed as a request parameter. The servlet can only plot up to 9 series. * It is customizable using these request parameters: * <ul> * <li>s1c, s2c, ... s9c - Series #i main color</li> * <li>s1o, s2o, ... s9o - Series #i outline color</li> * <li>bc - Chart background color</li> * <li>gc - Chart grid lines color</li> * <li>xl - X axis label</li> * <li>yl - Y axis label</li> * <li>xz - image width</li> * <li>yx - image height</li> * <li>l - show legend (boolean: true|false)</li> * <li>p - name of series provider bean</li> * </ul> */ public class RenderChartController extends AbstractController { /** The Constant logger. */ private static final Logger logger = LoggerFactory.getLogger(RenderChartController.class); /** The stats collection. */ private StatsCollection statsCollection; /** * Gets the stats collection. * * @return the stats collection */ public StatsCollection getStatsCollection() { return statsCollection; } /** * Sets the stats collection. * * @param statsCollection the new stats collection */ public void setStatsCollection(StatsCollection statsCollection) { this.statsCollection = statsCollection; } @Override protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception { final int seriesMaxCount = 9; // the max number of series // get Series Color from the request int[] seriesColor = new int[seriesMaxCount]; seriesColor[0] = Utils.toIntHex(request.getParameter("s1c"), 0x9bd2fb); seriesColor[1] = Utils.toIntHex(request.getParameter("s2c"), 0xFF0606); for (int i = 2; i < seriesMaxCount; i++) { seriesColor[i] = Utils.toIntHex(request.getParameter("s" + (i + 1) + "c"), -1); } // get Series Outline Color from the request int[] seriesOutlineColor = new int[seriesMaxCount]; seriesOutlineColor[0] = Utils.toIntHex(request.getParameter("s1o"), 0x0665aa); seriesOutlineColor[1] = Utils.toIntHex(request.getParameter("s2o"), 0x9d0000); for (int i = 2; i < seriesMaxCount; i++) { seriesOutlineColor[i] = Utils.toIntHex(request.getParameter("s" + (i + 1) + "o"), -1); } // background color int backgroundColor = Utils.toIntHex(request.getParameter("bc"), 0xFFFFFF); // grid color int gridColor = Utils.toIntHex(request.getParameter("gc"), 0); // X axis title String labelX = ServletRequestUtils.getStringParameter(request, "xl", ""); // Y axis title String labelY = ServletRequestUtils.getStringParameter(request, "yl", ""); // image width int width = ServletRequestUtils.getIntParameter(request, "xz", 800); // image height int height = ServletRequestUtils.getIntParameter(request, "yz", 400); // show legend? boolean showLegend = ServletRequestUtils.getBooleanParameter(request, "l", true); // Series provider String provider = ServletRequestUtils.getStringParameter(request, "p", null); // Chart type String chartType = ServletRequestUtils.getStringParameter(request, "ct", "area"); DefaultTableXYDataset ds = new DefaultTableXYDataset(); if (provider != null) { Object series = getApplicationContext().getBean(provider); if (series instanceof SeriesProvider) { ((SeriesProvider) series).populate(ds, statsCollection, request); } else { logger.error("SeriesProvider '{}' does not implement '{}'", provider, SeriesProvider.class); } } // Build series data from the give statistic JFreeChart chart = null; if ("area".equals(chartType)) { chart = ChartFactory.createXYAreaChart("", labelX, labelY, ds, PlotOrientation.VERTICAL, showLegend, false, false); ((XYAreaRenderer) chart.getXYPlot().getRenderer()).setOutline(true); } else if ("stacked".equals(chartType)) { chart = ChartFactory.createStackedXYAreaChart("", labelX, labelY, ds, PlotOrientation.VERTICAL, showLegend, false, false); } else if ("line".equals(chartType)) { chart = ChartFactory.createXYLineChart("", labelX, labelY, ds, PlotOrientation.VERTICAL, showLegend, false, false); final XYLine3DRenderer renderer = new XYLine3DRenderer(); renderer.setDrawOutlines(true); for (int i = 0; i < seriesMaxCount; i++) { renderer.setSeriesLinesVisible(i, true); renderer.setSeriesShapesVisible(i, true); renderer.setSeriesStroke(i, new BasicStroke(2)); } renderer.setXOffset(1); renderer.setYOffset(1); chart.getXYPlot().setRenderer(renderer); } if (chart != null) { chart.setAntiAlias(true); chart.setBackgroundPaint(new Color(backgroundColor)); for (int i = 0; i < seriesMaxCount; i++) { if (seriesColor[i] >= 0) { chart.getXYPlot().getRenderer().setSeriesPaint(i, new Color(seriesColor[i])); } if (seriesOutlineColor[i] >= 0) { chart.getXYPlot().getRenderer().setSeriesOutlinePaint(i, new Color(seriesOutlineColor[i])); } } chart.getXYPlot().setDomainGridlinePaint(new Color(gridColor)); chart.getXYPlot().setRangeGridlinePaint(new Color(gridColor)); chart.getXYPlot().setDomainAxis(0, new DateAxis()); chart.getXYPlot().setDomainAxis(1, new DateAxis()); chart.getXYPlot().setInsets(new RectangleInsets(-15, 0, 0, 10)); response.setHeader("Content-type", "image/png"); response.getOutputStream().write(ChartUtilities.encodeAsPNG(chart.createBufferedImage(width, height))); } return null; } }