JFreeChart生成折线图（生成图片本地保存，有解决中文乱码的通用方法）

import java.awt.Color; import java.awt.Font; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.XYPlot; import org.jfree.data.time.Month; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; import org.jfree.ui.RectangleInsets; import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer; import org.jfree.chart.renderer.xy.XYItemRenderer; import org.jfree.chart.axis.DateAxis; import org.jfree.chart.labels.*; import org.jfree.ui.*; /** * 创建JFreeChart Line Chart（折线图） */ public class CopyOfCreateJFreeChartLine { public static void main(String[] args) { // 步骤1：创建CategoryDataset对象（准备数据） TimeSeriesCollection dataset = createDataset(); // 步骤2：根据Dataset 生成JFreeChart对象，以及做相应的设置 JFreeChart freeChart = createChart(dataset); // 步骤3：将JFreeChart对象输出到文件，Servlet输出流等 saveAsFile(freeChart, "c://jfreechart//testline.png", 500, 300); } // 创建TimeSeriesCollection对象 public static TimeSeriesCollection createDataset() { TimeSeriesCollection lineDataset = new TimeSeriesCollection(); TimeSeries timeSeries = new TimeSeries("统计", Month.class); timeSeries.add(new Month(1, 2007), 11200); timeSeries.add(new Month(2, 2007), 9000); timeSeries.add(new Month(3, 2007), 6200); timeSeries.add(new Month(4, 2007), 8200); timeSeries.add(new Month(5, 2007), 8200); timeSeries.add(new Month(6, 2007), 12200); timeSeries.add(new Month(7, 2007), 13200); timeSeries.add(new Month(8, 2007), 8300); timeSeries.add(new Month(9, 2007), 12400); timeSeries.add(new Month(10, 2007), 12500); timeSeries.add(new Month(11, 2007), 13600); timeSeries.add(new Month(12, 2007), 12500); lineDataset.addSeries(timeSeries); return lineDataset; } // 根据CategoryDataset生成JFreeChart对象 public static JFreeChart createChart(TimeSeriesCollection lineDataset) { JFreeChart jfreechart = ChartFactory.createTimeSeriesChart( "统计", // 标题 "月份", // categoryAxisLabel （category轴，横轴，X轴的标签） "访问量", // valueAxisLabel（value轴，纵轴，Y轴的标签） lineDataset,// dataset true, // legend true, // tooltips true); // URLs // 配置字体（解决中文乱码的通用方法） Font xfont = new Font("宋体", Font.PLAIN, 16); // X轴 Font yfont = new Font("宋体", Font.PLAIN, 16); // Y轴 Font kfont = new Font("宋体", Font.PLAIN, 14); // 底部 Font titleFont = new Font("隶书", Font.BOLD, 20); // 图片标题 jfreechart.setBackgroundPaint(Color.white); XYPlot xyplot = (XYPlot) jfreechart.getPlot(); // 获得 plot：XYPlot！ xyplot.getDomainAxis().setLabelFont(xfont); xyplot.getRangeAxis().setLabelFont(yfont); jfreechart.getLegend().setItemFont(kfont); jfreechart.getTitle().setFont(titleFont); //设置时间格式，同时也解决了乱码问题 DateAxis dateaxis = (DateAxis)xyplot.getDomainAxis(); SimpleDateFormat sfd = new SimpleDateFormat("yy-MM"); dateaxis.setDateFormatOverride(sfd); xyplot.setDomainAxis(dateaxis); // 以下的设置可以由用户定制，也可以省略 XYPlot plot = (XYPlot) jfreechart.getPlot(); XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer) plot.getRenderer(); // 设置网格背景颜色 plot.setBackgroundPaint(Color.white); // 设置网格竖线颜色 plot.setDomainGridlinePaint(Color.pink); // 设置网格横线颜色 plot.setRangeGridlinePaint(Color.pink); // 设置曲线图与xy轴的距离 plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D)); // 设置曲线是否显示数据点 xylineandshaperenderer.setBaseShapesVisible(true); // 设置曲线显示各数据点的值 XYItemRenderer xyitem = plot.getRenderer(); xyitem.setBaseItemLabelsVisible(true); xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition( ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT)); xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator()); xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 14)); plot.setRenderer(xyitem); return jfreechart; } // 保存为文件 public static void saveAsFile(JFreeChart chart, String outputPath, int weight, int height) { FileOutputStream out = null; try { File outFile = new File(outputPath); if (!outFile.getParentFile().exists()) { outFile.getParentFile().mkdirs(); } out = new FileOutputStream(outputPath); // 保存为PNG文件 ChartUtilities.writeChartAsPNG(out, chart, 600, 350); // 保存为JPEG文件 //ChartUtilities.writeChartAsJPEG(out, chart, 500, 400); out.flush(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (out != null) { try { out.close(); } catch (IOException e) { // do nothing } } } } }