JFreeChart柱状图的完整范例

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import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;

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.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

public class AliHorizonBarChartDemo extends ApplicationFrame{
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?public AliHorizonBarChartDemo(String s){
??//这里是继承自ApplicationFrame
??super(s);
??//创建Dataset
??CategoryDataset categoryDataset=createDataset();
??//创建jfreechart
??JFreeChart jfreechart=createChart(categoryDataset);
??//创建容器
??ChartPanel chartPanel=createPanel();
??//设置容器的初始大小(Dimension是用来设置尺寸的)
??chartPanel.setPreferredSize(new Dimension(400,200));//尤其注意的是panel的高度会严重影响柱体的宽度
??//下面这句是关键,控制是否显示，也就是将整个组件放入到组件中去
??/**
?? * 对JFrame添加组件有两种方式：
　　??????? 1)用getContentPane()方法获得JFrame的内容面板，再对其加入组件：frame.getContentPane().add(childComponent)
　???????? 　2)建立一个Jpanel或JDesktopPane之类的中间容器，把组件添加到容器中，用setContentPane()方法把该容器置为JFrame的内容

?????????????????? 面板：
　?????????? 　　　JpanelcontentPane=newJpanel();//把其它组件添加到Jpanel中;
　　　?????????? 　frame.setContentPane(contentPane);　//把contentPane对象设置成为frame的内容面板
?? */
???? setContentPane(chartPanel);
?}
?public CategoryDataset createDataset(){
??System.out.println("========createDataSet========");
??//创建Dataset
??DefaultCategoryDataset defaultDataset=new DefaultCategoryDataset();
??//创建分类
??defaultDataset.addValue(100d, "S1","Apple" );
??defaultDataset.addValue(101d, "S1", "banana");
??defaultDataset.addValue(150d, "S1", "grape");
??defaultDataset.addValue(12d,"S1","pear");
??
??return defaultDataset;
??
?}
?public JFreeChart createChart(CategoryDataset dataset){
??System.out.println("===========createJfreechart========");
??//创建jfreechart
??????? JFreeChart jfreechart=ChartFactory.createBarChart("Ali's fruits","type","number",dataset,PlotOrientation.HORIZONTAL,false,true,false);?
??????? //设置jfreechart的背景
??????? System.out.println("jfreechart="+jfreechart);
??????? jfreechart.setBackgroundPaint(Color.yellow);
???????
??????? //创建plot
??????? CategoryPlot categoryPlot=(CategoryPlot)jfreechart.getPlot();
??????? System.out.println("categoryPlot="+categoryPlot);
??????? //设置场景的背景色
??????? categoryPlot.setBackgroundPaint(Color.gray);
??????? //还可以设置场景的横向网格
??????? categoryPlot.setDomainGridlinePaint(Color.red);
??????? //设置场景横向网格的可见性，如果不设置的话则不可见
??????? categoryPlot.setDomainGridlinesVisible(true);
??????? //设置场景的竖向网格
??????? categoryPlot.setRangeGridlinePaint(Color.green);
??????? //设置最长的说明标签的显示比例
??????? System.out.println(categoryPlot.getDomainAxis());
??????? categoryPlot.getDomainAxis().setMaximumCategoryLabelWidthRatio(0.8F);
???????
??????? //设置轴
??????? NumberAxis numberAxis=(NumberAxis)categoryPlot.getRangeAxis();
??????? //设置轴的单位
??????? numberAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
???????
??????? //添加额外的效果(表示器)
??????? BarRenderer barrender=(BarRenderer)categoryPlot.getRenderer();
??????? //设置是否显示外框
??????? barrender.setDrawBarOutline(true);
??????? //显示每个柱子的具体值
??????? //下面这两句缺一不可
??????? barrender.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
??????? barrender.setSeriesItemLabelsVisible(0, Boolean.TRUE);
??????? //添加渐变色
??????? GradientPaint gradientPaint=new GradientPaint(0.0f,0.0f,new Color(255,255,255),0.0f,0.0f,new Color(170,170,255));
??????? //给柱体上色
??????? barrender.setSeriesPaint(0,gradientPaint);
?????? return jfreechart;
?}
?public? ChartPanel createPanel(){
? JFreeChart jfreechart = createChart(createDataset());
??return new ChartPanel(jfreechart);
??
?}
?public static void main(String[] args){
??AliHorizonBarChartDemo demo=new AliHorizonBarChartDemo("ALI's bar chart");
??demo.pack();
??RefineryUtilities.centerFrameOnScreen(demo);
??demo.setVisible(true);
??demo.setDefaultCloseOperation(1);
??
?}
}