JFreeChart插件实现的折线图效果实例

package com.lei.jfreechart;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
public class LineCharts extends ApplicationFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
public LineCharts(String s) {
  super(s);
  setContentPane(createDemoLine());
}
public static void main(String[] args) {
  LineCharts fjc = new LineCharts("折线图");
  fjc.pack();
  RefineryUtilities.centerFrameOnScreen(fjc);
  fjc.setVisible(true);
}
// 生成显示图表的面板
public static JPanel createDemoLine() {
  JFreeChart jfreechart = createChart(createDataset());
  return new ChartPanel(jfreechart);
}
// 生成图表主对象JFreeChart
public static JFreeChart createChart(DefaultCategoryDataset linedataset) {
  // 定义图表对象
  JFreeChart chart = ChartFactory.createLineChart("一季度销售曲线", //折线图名称
   "时间", // 横坐标名称
   "销售额(百万)", // 纵坐标名称
   linedataset, // 数据
   PlotOrientation.VERTICAL, // 水平显示图像
   true, // include legend
   true, // tooltips
   false // urls
   );
  CategoryPlot plot = chart.getCategoryPlot();
  plot.setRangeGridlinesVisible(true); //是否显示格子线
  plot.setBackgroundAlpha(0.3f); //设置背景透明度
  NumberAxis rangeAxis = (NumberAxis)plot.getRangeAxis();
  rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
  rangeAxis.setAutoRangeIncludesZero(true);
  rangeAxis.setUpperMargin(0.20);
  rangeAxis.setLabelAngle(Math.PI / 2.0);
  return chart;
}
// 生成数据
public static DefaultCategoryDataset createDataset() {
  DefaultCategoryDataset linedataset = new DefaultCategoryDataset();
  // 各曲线名称
  String series1 = "冰箱";
  String series2 = "彩电";
  String series3 = "洗衣机";
  // 横轴名称(列名称)
  String type1 = "1月";
  String type2 = "2月";
  String type3 = "3月";
  linedataset.addValue(0.0, series1, type1);
  linedataset.addValue(4.2, series1, type2);
  linedataset.addValue(3.9, series1, type3);
  linedataset.addValue(1.0, series2, type1);
  linedataset.addValue(5.2, series2, type2);
  linedataset.addValue(7.9, series2, type3);
  linedataset.addValue(2.0, series3, type1);
  linedataset.addValue(9.2, series3, type2);
  linedataset.addValue(8.9, series3, type3);
  return linedataset;
}
}