package com.test.jfree; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.category.CategoryDataset; import org.jfree.data.general.DatasetUtilities; //JFreeChart Line Chart(折线图) public class CreateJFreeChartLine { public static void main(String[] args) { // 步骤1:创建CategoryDataset对象(准备数据) CategoryDataset 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:\\line.jpg", 600, 400); } // 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 //ChartUtilities.writeChartAsPNG(out, chart, 600, 400); // 保存为JPEG ChartUtilities.writeChartAsJPEG(out, chart, 600, 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 } } } } // 根据CategoryDataset创建JFreeChart对象 public static JFreeChart createChart(CategoryDataset categoryDataset) { // 创建JFreeChart对象:ChartFactory.createLineChart JFreeChart jfreechart = ChartFactory.createLineChart("不同类别按小时计算拆线图", // 标题 "年分", // categoryAxisLabel (category轴,横轴,X轴标签) "数量", // valueAxisLabel(value轴,纵轴,Y轴的标签) categoryDataset, // dataset PlotOrientation.VERTICAL, true, // legend false, // tooltips false); // URLs // 使用CategoryPlot设置各种参数。以下设置可以省略。 CategoryPlot plot = (CategoryPlot) jfreechart.getPlot(); // 背景色 透明度 plot.setBackgroundAlpha(0.5f); // 前景色 透明度 plot.setForegroundAlpha(0.5f); // 其他设置 参考 CategoryPlot类 return jfreechart; } public static CategoryDataset createDataset() { String[] rowKeys = { "A平台" }; String[] colKeys = { "0:00", "1:00", "2:00", "7:00", "8:00", "9:00", "10:00", "11:00", "12:00", "13:00", "16:00", "20:00", "21:00", "23:00" }; double[][] data = { { 4, 3, 1, 1, 1, 1, 2, 2, 2, 1, 8, 2, 1, 1 }, }; // 或者使用类似以下代码 // DefaultCategoryDataset categoryDataset = new // DefaultCategoryDataset(); // categoryDataset.addValue(10, "rowKey", "colKey"); return DatasetUtilities.createCategoryDataset(rowKeys, colKeys, data); } }