轉(zhuǎn)載自：http://www.blogjava.net/lyjjq/articles/61325.html

JFreeChart教程

一、jFreeChart產(chǎn)生圖形的流程?
創(chuàng)建一個數(shù)據(jù)源（dataset）來包含將要在圖形中顯示的數(shù)據(jù)>>創(chuàng)建一個 JFreeChart 對象來代表要顯示的圖形
>>把圖形輸出
重要的類和接口：
org.jfree.data.general.Dataset 所有數(shù)據(jù)源類都要實現(xiàn)的接口
org.jfree.chart.ChartFactory 由它來產(chǎn)生 JFreeChart 對象
org.jfree.chart.JFreeChart 所有對圖形的調(diào)整都是通過它噢！！
org.jfree.chart.plot.Plot 通過JFreeChart 對象獲得它，然后再通過它對圖形外部部分（例：坐標(biāo)軸）調(diào)整
注意：它有很多子類，一般都下嗍造型到它的子類！
org.jfree.chart.renderer.AbstractRenderer 通過JFreeChart 對象獲得它，然后再通過它對圖形內(nèi)部部分
（例：折線的類型）調(diào)整。同樣，針對不同類型的報表圖，它有
著不同的子類實現(xiàn)！在下面我們簡稱它為 Renderer
下面我們結(jié)合不同類型的圖形來具體分析這個流程。

二、餅圖
餅圖的dataset 一般是用PieDataset 接口，具體實現(xiàn)類是 DefaultPieDataset
1、創(chuàng)建一個數(shù)據(jù)源（dataset）：
private static PieDataset createDataset()
{
DefaultPieDataset defaultpiedataset = new DefaultPieDataset(); //注意是DefaultPieDataset！！
defaultpiedataset.setValue(”O(jiān)ne”, new Double(43.200000000000003D));
defaultpiedataset.setValue(”Two”, new Double(10D));
defaultpiedataset.setValue(”Three”, new Double(27.5D));
defaultpiedataset.setValue(”Four”, new Double(17.5D));
return defaultpiedataset;
}
2、由ChartFactory 產(chǎn)生 JFreeChart 對象
private static JFreeChart createChart(PieDataset piedataset)
{
JFreeChart jfreechart = ChartFactory.createPieChart(”Pie Chart Demo 1″, //圖形標(biāo)題名稱
piedataset, // dataset
true, // legend?
true, // tooltips?
false); //URLs?
PiePlot pieplot = (PiePlot)jfreechart.getPlot(); //通過JFreeChart 對象獲得 plot：PiePlot！！
pieplot.setNoDataMessage(”No data available”); // 沒有數(shù)據(jù)的時候顯示的內(nèi)容
return jfreechart;
}
一些重要的方法：
pieplot.setExplodePercent(0,0.3D) //把Lable 為”O(jiān)ne” 的那一塊”挖”出來30%
3、輸出略

三、柱狀圖
柱狀圖的dataset 一般是用CatagoryDataset接口(具體實現(xiàn)類是DefaultCategoryDataset),也會用 IntervalXYDataset
接口
1、創(chuàng)建一個數(shù)據(jù)源（dataset）：
private static CategoryDataset createDataset()
{
String series1 = “First”;
String series2 = “Second”;
String series3 = “Third”;
String category1 = “Category 1″;
String category2 = “Category 2″;
String category3 = “Category 3″;
String category4 = “Category 4″;
String category5 = “Category 5″;
DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
defaultcategorydataset.addValue(1.0D, series1, category1);
defaultcategorydataset.addValue(4D, series1, category2);
defaultcategorydataset.addValue(3D, series1, category3);
defaultcategorydataset.addValue(5D, series1, category4);
defaultcategorydataset.addValue(5D, series1, category5);

defaultcategorydataset.addValue(5D, series2, category1);
defaultcategorydataset.addValue(7D, series2, category2);
defaultcategorydataset.addValue(6D, series2, category3);
defaultcategorydataset.addValue(8D, series2, category4);
defaultcategorydataset.addValue(4D, series2, category5);

defaultcategorydataset.addValue(4D, series3, category1);
defaultcategorydataset.addValue(3D, series3, category2);
defaultcategorydataset.addValue(2D, series3, category3);
defaultcategorydataset.addValue(3D, series3, category4);
defaultcategorydataset.addValue(6D, series3, category5);
return defaultcategorydataset;
}
2、由ChartFactory 產(chǎn)生 JFreeChart 對象
private static JFreeChart createChart(CategoryDataset categorydataset)
{
JFreeChart jfreechart = ChartFactory.createBarChart(”Bar Chart Demo”, //圖形標(biāo)題名稱
“Category”,//domain 軸 Lable
這里先簡單理解為橫坐標(biāo)Lable好了
“Value”, //range 軸 Lable
這里也先簡單理解為縱坐標(biāo)Lable好了
categorydataset, // dataset
PlotOrientation.VERTICAL, //垂直顯示
true, // legend?
true, // tooltips?
false); //URLs?
jfreechart.setBackgroundPaint(Color.white); //設(shè)定背景色為白色
CategoryPlot categoryplot = jfreechart.getCategoryPlot(); //獲得 plot：CategoryPlot！！
categoryplot.setBackgroundPaint(Color.lightGray); //設(shè)定圖表數(shù)據(jù)顯示部分背景色
categoryplot.setDomainGridlinePaint(Color.white); //橫坐標(biāo)網(wǎng)格線白色
categoryplot.setDomainGridlinesVisible(true); //可見
categoryplot.setRangeGridlinePaint(Color.white); //縱坐標(biāo)網(wǎng)格線白色
//下面兩行使縱坐標(biāo)的最小單位格為整數(shù)
NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer(); //獲得renderer 注意這里是下嗍造型
到BarRenderer！！
barrenderer.setDrawBarOutline(false); // Bar的外輪廓線不畫
GradientPaint gradientpaint = new GradientPaint(0.0F, 0.0F, Color.blue,
0.0F, 0.0F, new Color(0, 0, 64)); //設(shè)定特定顏色
GradientPaint gradientpaint1 = new GradientPaint(0.0F, 0.0F, Color.green,
0.0F, 0.0F, new Color(0, 64, 0));
GradientPaint gradientpaint2 = new GradientPaint(0.0F, 0.0F, Color.red,
0.0F, 0.0F, new Color(64, 0, 0));
barrenderer.setSeriesPaint(0, gradientpaint); //給series1 Bar設(shè)定上面定義的顏色
barrenderer.setSeriesPaint(1, gradientpaint1); //給series2 Bar 設(shè)定上面定義的顏色
barrenderer.setSeriesPaint(2, gradientpaint2); //給series3 Bar 設(shè)定上面定義的顏色
CategoryAxis categoryaxis = categoryplot.getDomainAxis(); //橫軸上的 Lable 45度傾斜
categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
return jfreechart;
}
一些重要的方法：（增加一塊標(biāo)記）
IntervalMarker intervalmarker = new IntervalMarker(4.5D, 7.5D);
intervalmarker.setLabel(”Target Range”);
intervalmarker.setLabelFont(new Font(”SansSerif”, 2, 11));
intervalmarker.setLabelAnchor(RectangleAnchor.LEFT);
intervalmarker.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
intervalmarker.setPaint(new Color(222, 222, 255, 128));
categoryplot.addRangeMarker(intervalmarker, Layer.BACKGROUND);

四、折線圖
折線圖的dataset 兩種CatagoryDataset接口(具體實現(xiàn)類是DefaultCategoryDataset),XYDataset 接口
1、CatagoryDataset接口：
A、創(chuàng)建一個數(shù)據(jù)源（dataset）：
private static CategoryDataset createDataset()
{
String series1 = “First”;
String series2 = “Second”;
String series3 = “Third”;
String type1 = “Type 1″;
String type2 = “Type 2″;
String type3 = “Type 3″;
String type4 = “Type 4″;
String type5 = “Type 5″;
String type6 = “Type 6″;
String type7 = “Type 7″;
String type8 = “Type 8″;
DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
defaultcategorydataset.addValue(1.0D, series1, type1);
defaultcategorydataset.addValue(4D, series1, type2);
defaultcategorydataset.addValue(3D, series1, type3);
defaultcategorydataset.addValue(5D, series1, type4);
defaultcategorydataset.addValue(5D, series1, type5);
defaultcategorydataset.addValue(7D, series1, type6);
defaultcategorydataset.addValue(7D, series1, type7);
defaultcategorydataset.addValue(8D, series1, type8);

defaultcategorydataset.addValue(5D, series2, type1);
defaultcategorydataset.addValue(7D, series2, type2);
defaultcategorydataset.addValue(6D, series2, type3);
defaultcategorydataset.addValue(8D, series2, type4);
defaultcategorydataset.addValue(4D, series2, type5);
defaultcategorydataset.addValue(4D, series2, type6);
defaultcategorydataset.addValue(2D, series2, type7);
defaultcategorydataset.addValue(1.0D, series2, type8);

defaultcategorydataset.addValue(4D, series3, type1);
defaultcategorydataset.addValue(3D, series3, type2);
defaultcategorydataset.addValue(2D, series3, type3);
defaultcategorydataset.addValue(3D, series3, type4);
defaultcategorydataset.addValue(6D, series3, type5);
defaultcategorydataset.addValue(3D, series3, type6);
defaultcategorydataset.addValue(4D, series3, type7);
defaultcategorydataset.addValue(3D, series3, type8);
return defaultcategorydataset;
}
B、由ChartFactory 產(chǎn)生 JFreeChart 對象 (與上面重復(fù)的部分就不再注釋）
private static JFreeChart createChart(CategoryDataset categorydataset)
{
JFreeChart jfreechart = ChartFactory.createLineChart(”Line Chart Demo 1″,
“Type”,
“Value”,
categorydataset,
PlotOrientation.VERTICAL,
true,
true,
false);
jfreechart.setBackgroundPaint(Color.white);
CategoryPlot categoryplot = (CategoryPlot)jfreechart.getPlot();
categoryplot.setBackgroundPaint(Color.lightGray);
categoryplot.setRangeGridlinePaint(Color.white);
NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
numberaxis.setAutoRangeIncludesZero(true);
//獲得renderer 注意這里是下嗍造型到lineandshaperenderer！！
LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer)categoryplot.getRenderer();
lineandshaperenderer.setShapesVisible(true); //series 點（即數(shù)據(jù)點）可見
lineandshaperenderer.setSeriesStroke(0, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
10F, 6F
}, 0.0F)); //定義series為”First”的（即series1）點之間的連線 ，這里是虛線，默認(rèn)是直線
lineandshaperenderer.setSeriesStroke(1, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
6F, 6F
}, 0.0F)); //定義series為”Second”的（即series2）點之間的連線
lineandshaperenderer.setSeriesStroke(2, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
2.0F, 6F
}, 0.0F)); //定義series為”Third”的（即series3）點之間的連線
return jfreechart;
}
一些重要的方法：
lineandshaperenderer.setLineVisible(true) //series 點（即數(shù)據(jù)點）間有連線可見
2、XYDataset 接口：
A、創(chuàng)建一個數(shù)據(jù)源（dataset）：
private static XYDataset createDataset()
{
XYSeries xyseries = new XYSeries(”First”); //先產(chǎn)生XYSeries 對象
xyseries.add(1.0D, 1.0D);
xyseries.add(2D, 4D);
xyseries.add(3D, 3D);
xyseries.add(4D, 5D);
xyseries.add(5D, 5D);
xyseries.add(6D, 7D);
xyseries.add(7D, 7D);
xyseries.add(8D, 8D);

XYSeries xyseries1 = new XYSeries(”Second”);
xyseries1.add(1.0D, 5D);
xyseries1.add(2D, 7D);
xyseries1.add(3D, 6D);
xyseries1.add(4D, 8D);
xyseries1.add(5D, 4D);
xyseries1.add(6D, 4D);
xyseries1.add(7D, 2D);
xyseries1.add(8D, 1.0D);

XYSeries xyseries2 = new XYSeries(”Third”);
xyseries2.add(3D, 4D);
xyseries2.add(4D, 3D);
xyseries2.add(5D, 2D);
xyseries2.add(6D, 3D);
xyseries2.add(7D, 6D);
xyseries2.add(8D, 3D);
xyseries2.add(9D, 4D);
xyseries2.add(10D, 3D);

XYSeriesCollection xyseriescollection = new XYSeriesCollection(); //再用XYSeriesCollection添加入XYSeries 對象
xyseriescollection.addSeries(xyseries);
xyseriescollection.addSeries(xyseries1);
xyseriescollection.addSeries(xyseries2);
return xyseriescollection;
}
B、由ChartFactory 產(chǎn)生 JFreeChart 對象
private static JFreeChart createChart(XYDataset xydataset)
{
JFreeChart jfreechart = ChartFactory.createXYLineChart(”Line Chart Demo 2″,
“X”,
“Y”,
xydataset,
PlotOrientation.VERTICAL,
true,
true,
false);
jfreechart.setBackgroundPaint(Color.white);
XYPlot xyplot = (XYPlot)jfreechart.getPlot(); //獲得 plot：XYPlot！！
xyplot.setBackgroundPaint(Color.lightGray); //設(shè)定圖表數(shù)據(jù)顯示部分背景色
xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D)); //設(shè)定坐標(biāo)軸與圖表數(shù)據(jù)顯示部分距離
xyplot.setDomainGridlinePaint(Color.white); //網(wǎng)格線顏色
xyplot.setRangeGridlinePaint(Color.white);
//獲得 renderer 注意這里是XYLineAndShapeRenderer ！！
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
xylineandshaperenderer.setShapesVisible(true); //數(shù)據(jù)點可見
xylineandshaperenderer.setShapesFilled(true); //數(shù)據(jù)點被填充即不是空心點
NumberAxis numberaxis = (NumberAxis)xyplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
return jfreechart;
}
一些重要的方法：
XYLineAndShapeRenderer xylineandshaperenderer = new XYLineAndShapeRenderer();
xylineandshaperenderer.setSeriesLinesVisible(0, false); //第一個XYSeries數(shù)據(jù)點間連線不可見
xylineandshaperenderer.setSeriesShapesVisible(1, false); //第二個XYSeries數(shù)據(jù)點不可見
xyplot.setRenderer(xylineandshaperenderer);

五、時間序列圖
時間序列圖和折線圖很相似，不同的是它在 domain軸的數(shù)據(jù)是時間而不是數(shù)字。 時間序列圖的dataset 是
XYDataset 接口，具體實現(xiàn)類是TimeSeriesCollection ，和上面類似，有TimeSeries 對象，它被添加入
TimeSeriesCollection 。
1、創(chuàng)建一個數(shù)據(jù)源（dataset）：
private static XYDataset createDataset()
{
TimeSeries timeseries = new TimeSeries(”L&G European Index Trust”,Month.class);
timeseries.add(new Month(2, 2001), 181.8D);//這里用的是Month.class，同樣還有Day.class Year.class 等等
timeseries.add(new Month(3, 2001), 167.3D);
timeseries.add(new Month(4, 2001), 153.8D);
timeseries.add(new Month(5, 2001), 167.6D);
timeseries.add(new Month(6, 2001), 158.8D);
timeseries.add(new Month(7, 2001), 148.3D);
timeseries.add(new Month(8, 2001), 153.9D);
timeseries.add(new Month(9, 2001), 142.7D);
timeseries.add(new Month(10, 2001), 123.2D);
timeseries.add(new Month(11, 2001), 131.8D);
timeseries.add(new Month(12, 2001), 139.6D);
timeseries.add(new Month(1, 2002), 142.9D);
timeseries.add(new Month(2, 2002), 138.7D);
timeseries.add(new Month(3, 2002), 137.3D);
timeseries.add(new Month(4, 2002), 143.9D);
timeseries.add(new Month(5, 2002), 139.8D);
timeseries.add(new Month(6, 2002), 137D);
timeseries.add(new Month(7, 2002), 132.8D);

TimeSeries timeseries1 = new TimeSeries(”L&G UK Index Trust”,Month.class);
timeseries1.add(new Month(2, 2001), 129.6D);
timeseries1.add(new Month(3, 2001), 123.2D);
timeseries1.add(new Month(4, 2001), 117.2D);
timeseries1.add(new Month(5, 2001), 124.1D);
timeseries1.add(new Month(6, 2001), 122.6D);
timeseries1.add(new Month(7, 2001), 119.2D);
timeseries1.add(new Month(8, 2001), 116.5D);
timeseries1.add(new Month(9, 2001), 112.7D);
timeseries1.add(new Month(10, 2001), 101.5D);
timeseries1.add(new Month(11, 2001), 106.1D);
timeseries1.add(new Month(12, 2001), 110.3D);
timeseries1.add(new Month(1, 2002), 111.7D);
timeseries1.add(new Month(2, 2002), 111D);
timeseries1.add(new Month(3, 2002), 109.6D);
timeseries1.add(new Month(4, 2002), 113.2D);
timeseries1.add(new Month(5, 2002), 111.6D);
timeseries1.add(new Month(6, 2002), 108.8D);
timeseries1.add(new Month(7, 2002), 101.6D);
TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
timeseriescollection.addSeries(timeseries);
timeseriescollection.addSeries(timeseries1);
timeseriescollection.setDomainIsPointsInTime(true); //domain軸上的刻度點代表的是時間點而不是時間段
return timeseriescollection;
}
2、由ChartFactory 產(chǎn)生 JFreeChart 對象
private static JFreeChart createChart(XYDataset xydataset)
{
JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(”Legal & General Unit Trust Prices”,
“Date”,
“Price Per Unit”,
xydataset,
true,
true,
false);
jfreechart.setBackgroundPaint(Color.white);
XYPlot xyplot = (XYPlot)jfreechart.getPlot(); //獲得 plot : XYPlot!!
xyplot.setBackgroundPaint(Color.lightGray);
xyplot.setDomainGridlinePaint(Color.white);
xyplot.setRangeGridlinePaint(Color.white);
xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D));
xyplot.setDomainCrosshairVisible(true);
xyplot.setRangeCrosshairVisible(true);
org.jfree.chart.renderer.xy.XYItemRenderer xyitemrenderer = xyplot.getRenderer();
if(xyitemrenderer instanceof XYLineAndShapeRenderer)
{
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyitemrenderer;
xylineandshaperenderer.setDefaultShapesVisible(true); //數(shù)據(jù)點可見
xylineandshaperenderer.setDefaultShapesFilled(true); //數(shù)據(jù)點是實心點
}
DateAxis dateaxis = (DateAxis)xyplot.getDomainAxis(); //對domain 軸上日期顯示格式定義
dateaxis.setDateFormatOverride(new SimpleDateFormat(”MMM-yyyy”));
return jfreechart;
}
一些重要的方法：
A、增加標(biāo)記線：
xyplot.addRangeMarker(new ValueMarker(550D)); //數(shù)值軸
Quarter quarter = new Quarter(2, 2002);
xyplot.addDomainMarker(new ValueMarker(quarter.getMiddleMillisecond())); //時間軸
B、數(shù)據(jù)點的調(diào)整
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
xylineandshaperenderer.setDefaultShapesVisible(true); //數(shù)據(jù)點可見
xylineandshaperenderer.setSeriesFillPaint(0, Color.red); //數(shù)據(jù)點填充為紅色
xylineandshaperenderer.setSeriesFillPaint(1, Color.white); //數(shù)據(jù)點填充為白色
xylineandshaperenderer.setUseFillPaint(true); //應(yīng)用
C、平均值曲線
這個曲線有什么用呢？很簡單的例子，這里有一個以半年每天為單位的數(shù)據(jù)繪制的曲線，我們想看看以月為單位數(shù)據(jù)
的變化，這時就可以用到它了。
TimeSeries timeseries = createEURTimeSeries(); //就是以半年每天為單位的數(shù)據(jù)
TimeSeries timeseries1 = MovingAverage.createMovingAverage(timeseries,
“30 day moving average”,
30, //30天為一個周期
30); //最開始的30天跳過
TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
timeseriescollection.addSeries(timeseries);
timeseriescollection.addSeries(timeseries1);
return timeseriescollection;

六、總結(jié)一下
dataset plot renderer
餅圖 PieDataset（DefaultPieDataset） PiePlot ——
柱狀圖 CatagoryDataset（DefaultCategoryDataset） CategoryPlot BarRenderer
折線圖 CatagoryDataset（DefaultCategoryDataset） CategoryPlot LineAndShapeRenderer
XYDataset（XYSeriesCollection） XYPlot XYLineAndShapeRenderer
時間序列圖 XYDataset （TimeSeriesCollection） XYPlot XYLineAndShapeRenderer
這里只是一些常用的方法，具體還是看API
七、Item Lable
這里以柱狀圖為例說明，具體來說就是在每個柱狀上顯示它的數(shù)據(jù)，具體有下面內(nèi)容：
A、使 Item Lable 可見
B、調(diào)整 Item Lable 的顏色、字體等
C、調(diào)整 Item Lable 的位置
D、定制 Item Lable 的內(nèi)容
1、分配一個 Lable Generator 給 renderer
BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer();
GategoryLableGenerator generator =new StandardGategoryLableGenerator(
“{2}”, new DecimalFormat(”0.00″) //調(diào)整顯示的數(shù)字和字符格式
);
barrenderer.setLableGenerator(generator);
2、使 Item Lable 可見
barrenderer.setItemLableVisible(true);
3、調(diào)整 Item Lable 的顏色、字體等
barrenderer.setItemLablePaint(Color.red);
barrenderer.setItemLableFont(new Font(”SansSerif”,Font.PLAIN,10));
4、調(diào)整 Item Lable 的位置
這里涉及到一個新的對象 ItemLablePosition , ItemLablePosition的構(gòu)造函數(shù)有兩個或四個參數(shù)
public ItemLabelPosition(ItemLabelAnchor itemLabelAnchor,
org.jfree.ui.TextAnchor textAnchor,
org.jfree.ui.TextAnchor rotationAnchor,
double angle)
itemLabelAnchor - Item Lable 的位置 （最重要的！！）
textAnchor - Item Lable里包含的正文相對于Item Lable 的位置
rotationAnchor - Item Lable里包含的正文旋轉(zhuǎn)的位置
angle - 旋轉(zhuǎn)的角度
ItemLabelPosition itemlabelposition = new ItemLabelPosition(ItemLabelAnchor.INSIDE12,
TextAnchor.CENTER_RIGHT,
TextAnchor.CENTER_RIGHT,
-1.57D);
barrenderer.setPositiveItemLabelPosition(itemlabelposition);
這樣就可以每個柱狀上顯示它的數(shù)據(jù)了，當(dāng)然可以定制 Item Lable 的內(nèi)容，比如 Item Lable text 超過100的才
顯示，這樣就需要定制自己的類，它要實現(xiàn)GategoryLableGenerator 接口，實現(xiàn)generateItemLable()方法。

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