jfreechart jsp 结合 折线图

package jfree; import java.awt.Color; import java.awt.Font; import java.io.IOException; import java.io.PrintWriter; import java.text.NumberFormat; 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.axis.NumberAxis; import org.jfree.chart.entity.StandardEntityCollection; import org.jfree.chart.labels.StandardXYToolTipGenerator; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYItemRenderer; import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer; import org.jfree.chart.servlet.ServletUtilities; import org.jfree.chart.title.LegendTitle; import org.jfree.chart.title.TextTitle; import org.jfree.data.time.Day; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; import org.jfree.data.xy.XYDataset; import org.jfree.ui.RectangleInsets; /** * 曲线图的绘制 */ public class LineXYChart { /** * 返回生成图片的文件名 * * @param session * @param pw * @return 生成图片的文件名 */ public String getLineXYChart(HttpSession session, PrintWriter pw) { XYDataset dataset = this.createDateSet();// 建立数据集 String fileName = null; // 建立JFreeChart JFreeChart chart = ChartFactory.createTimeSeriesChart("JFreeChart时间曲线序列图", // title "Date", // x-axis label "Price", // y-axis label dataset, // data true, // create legend? true, // generate tooltips? false // generate URLs? ); // 设置JFreeChart的显示属性,对图形外部部分进行调整 chart.setBackgroundPaint(Color.red);// 设置曲线图背景色 // 设置字体大小，形状 Font font = new Font("宋体", Font.BOLD, 16); TextTitle title = new TextTitle("JFreeChart时间曲线序列图", font); chart.setTitle(title); // 副标题 TextTitle subtitle = new TextTitle("副标题", new Font("黑体", Font.BOLD, 12)); chart.addSubtitle(subtitle); chart.setTitle(title); // 标题 // 设置图示标题字符 // TimeSeries s1 = new TimeSeries("历史曲线", Day.class);该中文字符 LegendTitle legengTitle = chart.getLegend(); legengTitle.setItemFont(font); XYPlot plot = (XYPlot) chart.getPlot();// 获取图形的画布 plot.setBackgroundPaint(Color.lightGray);// 设置网格背景色 plot.setDomainGridlinePaint(Color.green);// 设置网格竖线(Domain轴)颜色 plot.setRangeGridlinePaint(Color.white);// 设置网格横线颜色 plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));// 设置曲线图与xy轴的距离 plot.setDomainCrosshairVisible(true); plot.setRangeCrosshairVisible(true); XYItemRenderer r = plot.getRenderer(); if (r instanceof XYLineAndShapeRenderer) { XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r; renderer.setBaseShapesVisible(true); renderer.setBaseShapesFilled(true); renderer.setShapesVisible(true);// 设置曲线是否显示数据点 } // 设置Y轴 NumberAxis numAxis = (NumberAxis) plot.getRangeAxis(); NumberFormat numFormater = NumberFormat.getNumberInstance(); numFormater.setMinimumFractionDigits(2); numAxis.setNumberFormatOverride(numFormater); // 设置提示信息 StandardXYToolTipGenerator tipGenerator = new StandardXYToolTipGenerator("历史信息{1} 16:00,{2})", new SimpleDateFormat("MM-dd"), numFormater); r.setToolTipGenerator(tipGenerator); // 设置X轴（日期轴） DateAxis axis = (DateAxis) plot.getDomainAxis(); axis.setDateFormatOverride(new SimpleDateFormat("MM-dd")); ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection()); try { fileName = ServletUtilities.saveChartAsPNG(chart, 500, 300, info, session);// 生成图片 // Write the image map to the PrintWriter ChartUtilities.writeImageMap(pw, fileName, info, false); } catch (IOException e) { e.printStackTrace(); } pw.flush(); return fileName;// 返回生成图片的文件名 } /** * 建立生成图形所需的数据集 * * @return 返回数据集 */ private XYDataset createDateSet() { TimeSeriesCollection dataset = new TimeSeriesCollection();// 时间曲线数据集合 TimeSeries s1 = new TimeSeries("历史曲线", Day.class);// 创建时间数据源，每一个//TimeSeries在图上是一条曲线 // s1.add(new Day(day,month,year),value),添加数据点信息 s1.add(new Day(1, 2, 2006), 123.51); s1.add(new Day(2, 2, 2006), 122.1); s1.add(new Day(3, 2, 2006), 120.86); s1.add(new Day(4, 2, 2006), 122.50); s1.add(new Day(5, 2, 2006), 123.12); s1.add(new Day(6, 2, 2006), 123.9); s1.add(new Day(7, 2, 2006), 124.47); s1.add(new Day(8, 2, 2006), 124.08); s1.add(new Day(9, 2, 2006), 123.55); s1.add(new Day(10, 2, 2006), 122.53); dataset.addSeries(s1); dataset.setDomainIsPointsInTime(true); return dataset; } }