jspGraphic（浅析web图形报表的实现)

/** * @author 李国庆 * @company leemenz (C) copyright * @time 2007-4-9 下午02:42:07 * @version 1.0.0.0 * @package leo.demo.chart * @project jspGraphic */ package leo.demo.chart; import java.awt.Color; import java.awt.Font; import java.io.PrintWriter; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import javax.servlet.http.HttpSession; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartRenderingInfo; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.DateAxis; import org.jfree.chart.entity.StandardEntityCollection; import org.jfree.chart.labels.StandardXYToolTipGenerator; import org.jfree.chart.plot.DatasetRenderingOrder; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.StandardXYItemRenderer; import org.jfree.chart.renderer.xy.XYStepAreaRenderer; import org.jfree.chart.servlet.ServletUtilities; import org.jfree.chart.title.TextTitle; import org.jfree.data.xy.XYDataset; import org.jfree.ui.RectangleInsets; public class MultipleChart { private Font titleFont = new Font("黑体",Font.CENTER_BASELINE,18); private XYDataset stepDataset; private XYDataset lineDataset; public MultipleChart() { super(); } public void setStepValue(XYDataset stepDataset) { this.stepDataset = stepDataset; } public void setLineDataset(XYDataset lineDataset) { this.lineDataset = lineDataset; } private JFreeChart createChart(XYDataset xydataset) { JFreeChart jfreechart = ChartFactory.createXYStepAreaChart("监控设置", "时刻", "流量", xydataset, PlotOrientation.VERTICAL, true, true, false); XYPlot xyplot = jfreechart.getXYPlot(); DateAxis dateaxis = new DateAxis("时刻"); //设置图两边空白尺寸 dateaxis.setLowerMargin(0.0D); dateaxis.setUpperMargin(0.0D); //X轴日期\时间格式 dateaxis.setDateFormatOverride(new SimpleDateFormat("HH")); xyplot.setDomainAxis(dateaxis); //设置轴线偏移 xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D)); //设置顺序 xyplot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD); //区域上不标注点 XYStepAreaRenderer xyarearenderer = (XYStepAreaRenderer)xyplot.getRenderer(); xyarearenderer.setPlotShapes(false); //设置区域颜色、透明度 xyarearenderer.setSeriesPaint(0, new Color(0, 0, 255, 64)); xyarearenderer.setToolTipGenerator(new StandardXYToolTipGenerator("{0}({1}) = {2}", new SimpleDateFormat("HH:mm"), new DecimalFormat("#,##0"))); //设置第二曲线 StandardXYItemRenderer standardxyitemrenderer = new StandardXYItemRenderer(); standardxyitemrenderer.setToolTipGenerator(new StandardXYToolTipGenerator("{0}({1}) = {2}", new SimpleDateFormat("HH:mm"), new DecimalFormat("#,##0"))); xyplot.setDataset(1, lineDataset); xyplot.setRenderer(1,standardxyitemrenderer); return jfreechart; } public String generateStepRendererChart( String title, HttpSession session, PrintWriter pw) { String filename = null; try { JFreeChart chart = createChart(stepDataset); //设置图片的背景色 chart.setBackgroundPaint(new Color(215,215,215)); //设置图片标题的字体和大小 TextTitle _title = new TextTitle(title); _title.setFont(titleFont); chart.setTitle(_title); //把生成的图片放到临时目录 ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection()); //设置图片名称前缀 ServletUtilities.setTempFilePrefix("chart-"); //500是图片长度，300是图片高度 filename = ServletUtilities.saveChartAsPNG(chart, 600, 350, info, session); ChartUtilities.writeImageMap(pw, filename, info, false); pw.flush(); System.out.println(System.getProperty("java.io.tmpdir") + filename); } catch (Exception e) { System.out.println("Exception - " + e.toString()); e.printStackTrace(System.out); filename = "public_error_600x350.png"; } return filename; } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub } }