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��Z��J2EE的面向对象型数据的报表系�l�的设计与实玎ͼ�转脓

matthew — Mon, 14 Aug 2006 06:35:00 GMT

一、jFreeChart产生囑�Ş的流�E?/span>
创徏一个数据源�Q�dataset�Q�来包含��要在图形中昄��的数�?????>>创徏一�?JFreeChart 对象来代表要昄��的图�?br />??????>>把图形输�?br />重要的类和接口：
org.jfree.data.general.Dataset 所有数据源�c�都要实现的接口
org.jfree.chart.ChartFactory 由它来��?JFreeChart 对象
org.jfree.chart.JFreeChart 所有对囑�Ş的调整都是通过它噢�Q�！
org.jfree.chart.plot.Plot 通过JFreeChart 对象获得它，然后再通过它对囑�Ş外部部分�Q�例�Q�坐标��u�Q�调�?br />注意�Q�它有很多子�c�，一般都下嗍造型到它的子�c�！
org.jfree.chart.renderer.AbstractRenderer 通过JFreeChart 对象获得它，然后再通过它对囑�Ş内部部分
�Q�例�Q�折�U�的�c�d��Q�调整。同��P��针对不同�c�d��的报表图�Q�它�?br />着不同的子�c�d��玎ͼ�在下面我们简�U�它�?Renderer
下面我们�l�合不同�c�d��的图形来具体分析�q�个��程�?br />
二、饼�?/span>
饼图的dataset 一般是用PieDataset 接口�Q�具体实现类�?DefaultPieDataset
1、创��Z��个数据源�Q�dataset�Q�：
private static PieDataset createDataset()
{
DefaultPieDataset defaultpiedataset = new DefaultPieDataset(); //注意是DefaultPieDataset�Q�！
defaultpiedataset.setValue(”One�? 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 产生 JFreeChart 对象
private static JFreeChart createChart(PieDataset piedataset)
{
JFreeChart jfreechart = ChartFactory.createPieChart(”Pie Chart Demo 1�? //囑�Ş标题名称
piedataset, // dataset
true, // legend?
true, // tooltips?
false); //URLs?
PiePlot pieplot = (PiePlot)jfreechart.getPlot(); //通过JFreeChart 对象获得 plot�Q�PiePlot�Q�！
pieplot.setNoDataMessage(”No data available�?; // 没有数据的时候显�C�的内容
return jfreechart;
}
一些重要的�Ҏ��Q?br />pieplot.setExplodePercent(0,0.3D) //把Lable 为”One�?的那一块”挖”出�?0%
3、输出略

三、柱状图
��q��囄��dataset 一般是用CatagoryDataset接口(具体实现�c�L��DefaultCategoryDataset),也会�?IntervalXYDataset
接口
1、创��Z��个数据源�Q�dataset�Q�：
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 产生 JFreeChart 对象
private static JFreeChart createChart(CategoryDataset categorydataset)
{
JFreeChart jfreechart = ChartFactory.createBarChart(”Bar Chart Demo�? //囑�Ş标题名称
“Category�?//domain �?Lable
�q�里先简单理解�ؓ横坐标Lable好了
“Value�? //range �?Lable
�q�里也先��单理解�ؓ�U�坐标Lable好了
categorydataset, // dataset
PlotOrientation.VERTICAL, //垂直昄��
true, // legend?
true, // tooltips?
false); //URLs?
jfreechart.setBackgroundPaint(Color.white); //讑֮�背景色�ؓ白色
CategoryPlot categoryplot = jfreechart.getCategoryPlot(); //获得 plot�Q�CategoryPlot�Q�！
categoryplot.setBackgroundPaint(Color.lightGray); //讑֮�图表数据昄��部分背景�?br />categoryplot.setDomainGridlinePaint(Color.white); //横坐标网格线白色
categoryplot.setDomainGridlinesVisible(true); //可见
categoryplot.setRangeGridlinePaint(Color.white); //�U�坐标网格线白色
//下面两行使纵坐标的最��单位格为整�?br />NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer(); //获得renderer 注意�q�里是下嗍造型
到BarRenderer�Q�！
barrenderer.setDrawBarOutline(false); // Bar的外轮廓�U�不�?br />GradientPaint gradientpaint = new GradientPaint(0.0F, 0.0F, Color.blue,
0.0F, 0.0F, new Color(0, 0, 64)); //讑֮�特定颜色
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); //�l�series1 Bar讑֮�上面定义的颜�?br />barrenderer.setSeriesPaint(1, gradientpaint1); //�l�series2 Bar 讑֮�上面定义的颜�?br />barrenderer.setSeriesPaint(2, gradientpaint2); //�l�series3 Bar 讑֮�上面定义的颜�?br />CategoryAxis categoryaxis = categoryplot.getDomainAxis(); //横��u上的 Lable 45度倾斜
categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
return jfreechart;
}
一些重要的�Ҏ��Q�（增加一块标讎ͼ�
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�U�图
折线囄��dataset 两种CatagoryDataset接口(具体实现�c�L��DefaultCategoryDataset),XYDataset 接口
1、CatagoryDataset接口�Q?br />A、创��Z��个数据源�Q�dataset�Q�：
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 产生 JFreeChart 对象 (与上面重复的部分��׃��再注释）
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);
//获得renderer 注意�q�里是下嗍造型到lineandshaperenderer�Q�！
LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer)categoryplot.getRenderer();
lineandshaperenderer.setShapesVisible(true); //series 点（��x��据点�Q�可�?br />lineandshaperenderer.setSeriesStroke(0, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
10F, 6F
}, 0.0F)); //定义series为”First”的�Q�即series1�Q�点之间的连�U?�Q�这里是虚线�Q�默认是直线
lineandshaperenderer.setSeriesStroke(1, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
6F, 6F
}, 0.0F)); //定义series为”Second”的�Q�即series2�Q�点之间的连�U?br />lineandshaperenderer.setSeriesStroke(2, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
2.0F, 6F
}, 0.0F)); //定义series为”Third”的�Q�即series3�Q�点之间的连�U?br />return jfreechart;
}
一些重要的�Ҏ��Q?br />lineandshaperenderer.setLineVisible(true) //series 点（��x��据点�Q�间有连�U�可�?br />2、XYDataset 接口�Q?br />A、创��Z��个数据源�Q�dataset�Q�：
private static XYDataset createDataset()
{
XYSeries xyseries = new XYSeries(”First�?; //先��生XYSeries 对象
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��d��入XYSeries 对象
xyseriescollection.addSeries(xyseries);
xyseriescollection.addSeries(xyseries1);
xyseriescollection.addSeries(xyseries2);
return xyseriescollection;
}
B、由ChartFactory 产生 JFreeChart 对象
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(); //获得 plot�Q�XYPlot�Q�！
xyplot.setBackgroundPaint(Color.lightGray); //讑֮�图表数据昄��部分背景�?br />xyplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D)); //讑֮�坐标轴与图表数据昄��部分距离
xyplot.setDomainGridlinePaint(Color.white); //�|�格�U�K��?br />xyplot.setRangeGridlinePaint(Color.white);
//获得 renderer 注意�q�里是XYLineAndShapeRenderer �Q�！
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
xylineandshaperenderer.setShapesVisible(true); //数据点可�?br />xylineandshaperenderer.setShapesFilled(true); //数据点被填充即不是空心点
NumberAxis numberaxis = (NumberAxis)xyplot.getRangeAxis();
numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
return jfreechart;
}
一些重要的�Ҏ��Q?br />XYLineAndShapeRenderer xylineandshaperenderer = new XYLineAndShapeRenderer();
xylineandshaperenderer.setSeriesLinesVisible(0, false); //�W�一个XYSeries数据炚w��q�线不可�?br />xylineandshaperenderer.setSeriesShapesVisible(1, false); //�W�二个XYSeries数据点不可见
xyplot.setRenderer(xylineandshaperenderer);

五、时间序列图
旉��序列囑֒�折线囑־��怼��Q�不同的是它�?domain轴的数据是时间而不是数字�?旉��序列囄��dataset �?br />XYDataset 接口�Q�具体实现类是TimeSeriesCollection �Q�和上面�c�M��Q�有TimeSeries 对象�Q�它被添加入
TimeSeriesCollection �?br />1、创��Z��个数据源�Q�dataset�Q�：
private static XYDataset createDataset()
{
TimeSeries timeseries = new TimeSeries(”L&G European Index Trust�?Month.class);
timeseries.add(new Month(2, 2001), 181.8D);//�q�里用的是Month.class�Q�同栯��有Day.class Year.class �{�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轴上的刻度点代表的是旉��点而不是时间段
return timeseriescollection;
}
2、由ChartFactory 产生 JFreeChart 对象
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(); //获得 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); //数据点可�?br />xylineandshaperenderer.setDefaultShapesFilled(true); //数据�Ҏ��实心�?br />}
DateAxis dateaxis = (DateAxis)xyplot.getDomainAxis(); //对domain 轴上日期昄��格式定义
dateaxis.setDateFormatOverride(new SimpleDateFormat(”MMM-yyyy�?);
return jfreechart;
}
一些重要的�Ҏ��Q?br />A、增加标记线�Q?br />xyplot.addRangeMarker(new ValueMarker(550D)); //数��D�u
Quarter quarter = new Quarter(2, 2002);
xyplot.addDomainMarker(new ValueMarker(quarter.getMiddleMillisecond())); //旉��?br />B、数据点的调�?br />XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
xylineandshaperenderer.setDefaultShapesVisible(true); //数据点可�?br />xylineandshaperenderer.setSeriesFillPaint(0, Color.red); //数据点填充�ؓ�U�色
xylineandshaperenderer.setSeriesFillPaint(1, Color.white); //数据点填充�ؓ白色
xylineandshaperenderer.setUseFillPaint(true); //应用
C、��^均值曲�U?br />�q�个曲线有什么用呢？很简单的例子�Q�这里有一个以半年每天为单位的数据�l�制的曲�U�，我们想看看以月�ؓ单位数据
的变化，�q�时��可以用到它了�?br />TimeSeries timeseries = createEURTimeSeries(); //��是以半�q�每天�ؓ单位的数�?br />TimeSeries timeseries1 = MovingAverage.createMovingAverage(timeseries,
�?0 day moving average�?
30, //30天�ؓ一个周�?br />30); //最开始的30天蟩�q?br />TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
timeseriescollection.addSeries(timeseries);
timeseriescollection.addSeries(timeseries1);
return timeseriescollection;

六、�ȝ��一�?/span>
dataset plot renderer
饼图 PieDataset�Q�DefaultPieDataset�Q?PiePlot —�?br />��q��?CatagoryDataset�Q�DefaultCategoryDataset�Q?CategoryPlot BarRenderer
折线�?CatagoryDataset�Q�DefaultCategoryDataset�Q?CategoryPlot LineAndShapeRenderer
XYDataset�Q�XYSeriesCollection�Q?XYPlot XYLineAndShapeRenderer
旉��序列�?XYDataset �Q�TimeSeriesCollection�Q?XYPlot XYLineAndShapeRenderer
�q�里只是一些常用的�Ҏ��Q�具体还是看API
七、Item Lable
�q�里以柱状图��Z��说明�Q�具体来说就是在每个��q��上显�C�它的数据，具体有下面内容：
A、�� Item Lable 可见
B、调�?Item Lable 的颜艌Ӏ�字体等
C、调�?Item Lable 的位�|?br />D、定�?Item Lable 的内�?br />1、分配一�?Lable Generator �l?renderer
BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer();
GategoryLableGenerator generator =new StandardGategoryLableGenerator(
“{2}�? new DecimalFormat(�?.00�? //调整昄��的数字和字符格式
);
barrenderer.setLableGenerator(generator);
2、�� Item Lable 可见
barrenderer.setItemLableVisible(true);
3、调�?Item Lable 的颜艌Ӏ�字体等
barrenderer.setItemLablePaint(Color.red);
barrenderer.setItemLableFont(new Font(”SansSerif�?Font.PLAIN,10));
4、调�?Item Lable 的位�|?br />�q�里涉及��C��个新的对�?ItemLablePosition , ItemLablePosition的构造函数有两个或四个参�?br />public ItemLabelPosition(ItemLabelAnchor itemLabelAnchor,
org.jfree.ui.TextAnchor textAnchor,
org.jfree.ui.TextAnchor rotationAnchor,
double angle)
itemLabelAnchor - Item Lable 的位�|?�Q�最重要的！�Q�）
textAnchor - Item Lable里包含的正文相对于Item Lable 的位�|?br />rotationAnchor - Item Lable里包含的正文旋�{的位�|?br />angle - 旋�{的角�?br />ItemLabelPosition itemlabelposition = new ItemLabelPosition(ItemLabelAnchor.INSIDE12,
TextAnchor.CENTER_RIGHT,
TextAnchor.CENTER_RIGHT,
-1.57D);
barrenderer.setPositiveItemLabelPosition(itemlabelposition);
�q�样��可以每个柱状上昄��它的数据了，当然可以定制 Item Lable 的内容，比如 Item Lable text ��过100的才
昄��Q�这样就需要定制自��q��c�，它要实现GategoryLableGenerator 接口�Q�实现generateItemLable()�Ҏ��

matthew 2006-08-14 14:35 发表评论

JFreeChart 初学

matthew — Fri, 07 Jul 2006 07:26:00 GMT

�׃��目需求原因，上网看了些JfreeChart的例子。自己就试着用了下：
BarCharDemo.jsp
<%@page contentType="text/html; charset=GB2312"%>

<%@page import="java.io.FileNotFoundException"%>
<%@page import="java.io.FileOutputStream"%>
<%@page import="org.apache.commons.logging.Log"%>
<%@page import="java.io.IOException"%>

   JFreeChart chart      = ChartFactory.createPieChart3D(
    "水果产量�?,       //图标标题
    dataset,       //数据�?br />    true,        //是否昄��图例�Q�简单的��p��囑ֿ��L��fasle�Q?br />    false,        //是否生成工具
    false        //是否生成URL链接
    );

ChartUtilities.writeChartAsJPEG(response.getOutputStream(),chart,640,370);
%>

PieChartDemo.jsp
<%@page contentType="text/html; charset=GB2312"%>

<%@page import="java.io.FileNotFoundException"%>
<%@page import="java.io.FileOutputStream"%>
<%@page import="org.apache.commons.logging.Log"%>
<%@page import="java.io.IOException"%>

<%@page import="org.apache.commons.logging.LogFactory"%>
<%@page import="org.jfree.chart.ChartFactory"%>
<%@page import="org.jfree.chart.ChartUtilities"%>
<%@page import="org.jfree.chart.JFreeChart"%>
<%@page import="org.jfree.chart.plot.PlotOrientation"%>
<%@page import="org.jfree.data.category.CategoryDataset"%>
<%@page import="org.jfree.data.category.DefaultCategoryDataset"%>
<%
DefaultCategoryDataset dataset    = new DefaultCategoryDataset();
dataset.addValue(100, "北京", "�Ҏ��");
dataset.addValue(130, "上�v", "�Ҏ��");
dataset.addValue(160, "�q�州", "�Ҏ��");
dataset.addValue(200, "北京", "梨子");
dataset.addValue(230, "上�v", "梨子");
dataset.addValue(260, "�q�州", "梨子");
dataset.addValue(300, "北京", "葡萄");
dataset.addValue(330, "上�v", "葡萄");
dataset.addValue(360, "�q�州", "葡萄");
dataset.addValue(400, "北京", "香蕉");
dataset.addValue(430, "上�v", "香蕉");
dataset.addValue(460, "�q�州", "香蕉");
dataset.addValue(500, "北京", "荔枝");
dataset.addValue(530, "上�v", "荔枝");
dataset.addValue(560, "�q�州", "荔枝");

    JFreeChart chart      = ChartFactory.createBarChart3D(
    "水果产量�?,       //图标标题
    "水果",        //目录轴显�C�标�{?�Q�x��_��
    "产量",        //数据轴显�C�标�{?�Q�y��_��
    dataset,       //数据�?br />    PlotOrientation.VERTICAL,   //图标方向�Q�水�q�I��垂直
    true,        //是否昄��图例�Q�简单的��p��囑ֿ��L��fasle�Q?br />    false,        //是否生成工具
    false        //是否生成URL链接
    );

    ChartUtilities.writeChartAsJPEG(response.getOutputStream(),chart,640,370);
%>

TimeSeriesDemo�Q�在��面上显�C�）
首先配置web.xml

  DisplayChart
  org.jfree.chart.servlet.DisplayChart

  DisplayChart
  /servlet/DisplayChart

TimeSeriesDemo.java

package net.neitbe.home.jfreechart.business;

import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.io.IOException;

import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.TimeSeriesDataItem;

/**
* @author neitbe
*/
public class TimeSeriesDemo {

private static Log log    = LogFactory.getLog(TimeSeriesDemo.class);

//曲线图标�?br /> private String title    = "��势分析";
//曲线图X轴提�C?br /> private String domain    = "月䆾走势";
//曲线图Y轴提�C?br /> private String range    = "应收余额";
//曲线图自标题
private String subtitleStr   = "2005财年分析";

//创徏旉��数据�?br /> //每一个TimeSeries在图上是一条曲�U?br /> private TimeSeries yongyou    = new TimeSeries("用友");
private TimeSeries jindie    = new TimeSeries("金碟");
private TimeSeries dongruan    = new TimeSeries("东��Y");

//旉��曲线数据集合
private static TimeSeriesCollection dataset = new TimeSeriesCollection();

private void setDataset() {
  dataset.removeAllSeries();        //在javaBean中��用此�c�这个很重要�Q�不然会不停的加入新的TimeSeries;
  dataset.addSeries(this.yongyou);
  dataset.addSeries(this.jindie);
  dataset.addSeries(this.dongruan);

}

private void setDongruan() {
  this.dongruan.clear();     //很重要，不然会报�?br />  /**
   * 报错
   * org.apache.jasper.JasperException: You are attempting to add an observation for the time period
   * �q�里是在�c�d��性里声明TimeSeries才用到的
   */
  for(int i = 1999; i < 2005; i++) {
   for(int mon = 0; mon < 12; mon++) {

    this.dongruan.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(300 - Math.random()*100)));
   }
  }
}

private void setJindie() {

  this.jindie.clear();    //很重要，不然会报�?br />  for(int i = 1999; i < 2005; i++) {
   for(int mon = 0; mon < 12; mon++) {
    this.jindie.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(400 - Math.random()*100)));
   }
  }
}

private void setYongyou() {
  this.yongyou.clear();   //很重要，不然会报�?br />  for(int i = 1999; i < 2005; i++) {
   for(int mon = 0; mon < 12; mon++) {
    this.yongyou.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(500 - Math.random()*100)));
   }
  }

}

private TimeSeriesCollection getDataset() {
  this.setDongruan();
  this.setJindie();
  this.setYongyou();
  this.setDataset();
  return dataset;
}

public String drawPic(HttpSession session) {
  String fileName       = null;
  JFreeChart chart      = ChartFactory.createTimeSeriesChart(title,domain,range,getDataset(),true,true,false);
  TextTitle subTitle      = new TextTitle(subtitleStr,new Font("黑体",Font.BOLD,12));
  chart.addSubtitle(subTitle);
  chart.setTitle(new TextTitle(title,new Font("隶书",Font.ITALIC,15)));
  chart.setBorderPaint(new GradientPaint(0,0,Color.white,0,1000,Color.blue));
  //String fileName       = "D:\\fuit2.jpeg";
  try {
   ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());

   log.debug("准备创徏囄��…�?);
   fileName       = ServletUtilities.saveChartAsJPEG(chart,600,600,info,session);
   log.debug("囄��创徏成功�Q?);
  } catch (IOException e) {
   log.error("IO异常�Q?,e);
  }
  log.debug("�q�回的文件名为：" + fileName);
  return fileName;
}

/*public static void main(String[] args) {
  TimeSeriesDemo timeSeriesDemo   = new TimeSeriesDemo();
  timeSeriesDemo.drawPic();
}*/

}

index.jsp��面�Q?br /> <%@ page language="java" contentType="text/html; charset=GBK"
    pageEncoding="GBK"%>

Insert title here

<%
String fileName   = timeSeries.drawPic(request.getSession());
String graphURL   = request.getContextPath()+"/servlet/DisplayChart?filename=" + fileName;
%>
<%=graphURL%>

" width="400" height="400" border="1"/>

matthew 2006-07-07 15:26 发表评论

matthew — Sat, 01 Jul 2006 08:52:00 GMT

Jasperreport�q�箋打印多个报表模板�Q�这个问题一直困扰我很久。网上查了很多资料都没有具体的解军_��法，通过查询jasperreport的API发现提供了解册��个问题的�Ҏ��。以下是我的�q�程记录�Q?br />
问题描述�Q�一般报表设计和打印中，主要是对单个报表模板�q�行数据填充、打印、导出。但是，也有个别情况需要连�l�打印多个报表模�ѝ��比如，政府机关的上报材料，属于一个完整的文档。如果一个一个模板打��C��昑־�非常�ȝ��?br />
问题解决�q�程�Q?/strong>一般我们导出报表文件是使用�q�个语句�Q?br />exporter.setParamete(JRExporterParameter.JASPER_PRINT, jasperprint);但是它是对单个模板进行操作，通过查找jasperreport的API发现�q�提供了�q�样一个语句：
exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST, jasperprint);可以�q�箋对多个报表模板操作。它的方法是通过一个list来存储多个JasperPrint对象�Q�从而实现多个报表模板的打印。在我解决问题的�q�程中发现导出PDF文�g格式比较��单，但是导出WORD文档时发现编码格式出现问题，老是出现��q��。即使这�? exporter.setParameter(JRExporterParameter.CHARACTER_ENCODING, "GB2312");也没有用。后来浏览一��脓子：“导出excel时出��Cؕ码问题”，和我的问题差不多。终于大功告成！

matthew 2006-07-01 16:52 发表评论

jasper report 使用 hibernate 数据源性能优化

matthew — Thu, 29 Jun 2006 12:00:00 GMT

�Q��{��_��Autohr John Ferguson Smart �Q?br /> �? 使用�?hibernate 的分��功能，对大数据量查询采用分�D�读入方法，避免了一�ơ读入带来的性能下降�Q�一般在Tomcat 环境下，当List中的 Object > 10000 一般会��D�� OutOfMemory�?br />

Introduction
In the article, we examine a performance-optimised approach for using Hibernate queries to generate reports with JasperReports.

JasperReports is a powerful and flexible Open Source reporting tool. Combined with the graphical design tool iReport, for example, you get a complete Java Open Source reporting solution. In this article, we will investigate how you can integrate JasperReports reporting with Hibernate data sources in an optimal manner, without sacrificing ease-of-use or performance.

Basic Hibernate/JasperReports integration
To integrate Hibernate and JasperReports, you have to define a JasperReports data source. One simple and intuitive approach is to use the JRBeanCollectionDataSource data source (This approach is presented here) :

-------------------------------------------------------------------------------------------------------
List results = session.find("from com.acme.Sale");

Map parameters = new HashMap();
parameters.put("Title", "Sales Report");

InputStream reportStream
= this.class.getResourceAsStream("/sales-report.xml");
JasperDesign jasperDesign = JasperManager.loadXmlDesign(reportStream);
JasperReport jasperReport = JasperManager.compileReport(jasperDesign);

JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(results);
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport,
parameters,
ds);

JasperExportManager.exportReportToPdfFile(jasperPrint, "sales-report.pdf");

------------------------------------------------------------------------------------------------------------

This approach will work well for small lists. However, for reports involving tens or hundreds of thousands of lines, it is inefficiant, memory-consuming, and slow. Indeed, experience shows that, when running on a standard Tomcat configuration, a list returning as few as 10000 business objects can cause OutOfMemory exceptions. It also wastes time building a bulky list of objects before processing them, and pollutes the Hibernate session (and possibly second-level caches with temporary objects.

Optimised Hibernate/JasperReports integration
We need a way to efficiently read and process Hibernate queries, without creating too many unnecessary temporary objects in memory. One possible way to do this is the following :

Define an optimised layer for executing Hibernate queries efficiently
Define an abstraction layer for these classes which is compatible with JasperReports
Wrap this data access layer in a JasperReports class that can be directly plugged into JasperReports
The Hibernate Data Access Layer : The QueryProvider interface and its implementations
We start with the optimised Hibernate data access. (you may note that this layer is not actually Hibernate-specific, so other implementations could implement other types of data access without impacting the design).

This layer contains two principal classes :

The CriteriaSet class
The QueryProvider interface

A CriteriaSet is simply a JavaBean which contains parameters which may be passed to the Hibernate query. It is simply a generic way of encapsulating a set of parameters. A QueryProvider provides a generic way of returning an arbitrary subset of the query results set. The essential point is that query results are read in small chunks, not all at once. This allows more efficient memory handling and better performance.

------------------------------------------------------------------------------------------------------------
/**
* A QueryProvidor provides a generic way of fetching a set of objects.
*/
public interface QueryProvider {

/**
* Return a set of objects based on a given criteria set.
* @param firstResult the first result to be returned
* @param maxResults the maximum number of results to be returned
* @return a list of objects
*/
List getObjects(CriteriaSet criteria,
int firstResult,
int maxResults) throws HibernateException;
}
----------------------------------------------------------------------------------------------------------

A typical implementation of this class simply builds a Hibernate query using the specified criteria set and returns the requested subset of results. For example :

-----------------------------------------------------------------------------------------------------------

public class ProductQueryProvider implements QueryProvider {

public List getObjects(CriteriaSet criteria,
int firstResult,
int maxResults)
throws HibernateException {
//
// Build query criteria
//
Session sess = SessionManager.currentSession();
ProductCriteriaSet productCriteria
= (ProductCriteriaSet) criteria;
Query query = session.find("from com.acme.Product p "
+ "where p.categoryCode = :categoryCode ");

query.setParameter("categoryCode",
productCriteria.getCategoryCode();
return query.setCacheable(true)
.setFirstResult(firstResult)
.setMaxResults(maxResults)
.setFetchSize(100)
.list();
}
}
-------------------------------------------------------------------------------------------------

A more sophisticated implementation is helpful for dynamic queries. We define an abstract BaseQueryProvider class which can be used for dynamic query generation. This is typically useful when the report has to be generated using several parameters, some of which are optionnal.. Each derived class overrides the buildCriteria() method. This method builds a Hibernate Criteria object using the specified Criteria set as appropriate :

---------------------------------------------------------------------------------------------------

public abstract class BaseQueryProvider implements QueryProvider {

public List getObjects(CriteriaSet criteria, int firstResult, int maxResults)
throws HibernateException {

Session sess = SessionManager.currentSession();
Criteria queryCriteria = buildCriteria(criteria, sess);
return queryCriteria.setCacheable(true)
.setFirstResult(firstResult)
.setMaxResults(maxResults)
.setFetchSize(100)
.list();

}

protected abstract Criteria buildCriteria(CriteriaSet criteria, Session sess);
}
-------------------------------------------------------------------------------------------------

A typical implementation is shown here :

--------------------------------------------------------------------------------------------------

public class SalesQueryProvider extends BaseQueryProvider {

protected Criteria buildCriteria(CriteriaSet criteria,
Session sess) {
//
// Build query criteria
//
SalesCriteriaSet salesCriteria
= (SalesCriteriaSet) criteria;

Criteria queryCriteria
= sess.createCriteria(Sale.class);

if (salesCriteria.getStartDate() != null) {
queryCriteria.add(
Expression.eq("getStartDate",
salesCriteria.getStartDate()));
}
// etc...

return queryCriteria;
}
}
------------------------------------------------------------------------------------------------

Note that a QueryProvider does not need to return Hibernate-persisted objects. Large-volume queries can sometimes be more efficiently implemented by returning custom-made JavaBeans containing just the required columns. HQL allows you to to this quite easily :

---------------------------------------------------------------------------------------------------
public class CityQueryProvider implements QueryProvider {

public List getObjects(CriteriaSet criteria,
int firstResult,
int maxResults)
throws HibernateException {
//
// Build query criteria
//
Session sess = SessionManager.currentSession();
Query query
= session.find(
"select new CityItem(city.id, "
+ " city.name, "
+ " city.electrityCompany.name) "
+ " from City city "
+ " left join city.electrityCompany");

return query.setCacheable(true)
.setFirstResult(firstResult)
.setMaxResults(maxResults)
.setFetchSize(100)
.list();
}
}
-------------------------------------------------------------------------------------------------

Hibernate data access abstraction : the ReportDataSource interface
Next, we define a level of abstraction between the Hibernate querying and the JasperReport classes. The ReportDataSource does this :

--------------------------------------------------------------------------------------------------
public interface ReportDataSource extends Serializable {
Object getObject(int index);
}

--------------------------------------------------------------------------------------------------

The standard implementation of this interface reads Hibernate objects using a given QueryProvider and returns them to JasperReports one by one. Here is the source code of this class (getters, setters, logging code and error-handling code have been removed for clarty) :

---------------------------------------------------------------------------------------------------
public class ReportDataSourceImpl implements ReportDataSource {

private CriteriaSet criteriaSet;
private QueryProvider queryProvider;
private List resultPage;
private int pageStart = Integer.MAX_VALUE;
private int pageEnd = Integer.MIN_VALUE;
private static final int PAGE_SIZE = 50;

//
// Getters and setters for criteriaSet and queryProvider
//
...

public List getObjects(int firstResult,
int maxResults) {

List queryResults = getQueryProvider()
.getObjects(getCriteriaSet(),
firstResult,
maxResults);
if (resultPage == null) {
resultPage = new ArrayList(queryResults.size());
}
resultPage.clear();
for(int i = 0; i < queryResults.size(); i++) {
resultPage.add(queryResults.get(i));
}
pageStart = firstResult;
pageEnd = firstResult + queryResults.size() - 1;
return resultPage;
}
public final Object getObject(int index) {
if ((resultPage == null)
|| (index < pageStart)
|| (index > pageEnd)) {
resultPage = getObjects(index, PAGE_SIZE);
}
Object result = null;
int pos = index - pageStart;
if ((resultPage != null)
&& (resultPage.size() > pos)) {
result = resultPage.get(pos);
}
return result;
}
}

---------------------------------------------------------------------------------------------------

Finally, we have to be able to call the Hibernate data source from JasperReports. To do so, we start by looking at the JasperManager fillReport() method, which takes a JRDataSource object as its third parameter and uses it to generate the report :

---------------------------------------------------------------------------------------------------
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport, parameters, ds);

---------------------------------------------------------------------------------------------------

To implement our own optimised JRDataSource, we extended the JRAbstractBeanDataSource class. This class is presented here (logging and error-handling code has been removed for clarty).

---------------------------------------------------------------------------------------------------
public class ReportSource extends JRAbstractBeanDataSource {

private ReportDataSource dataSource;
protected int index = 0;
protected Object bean;
private static Map fieldNameMap = new HashMap();

public ReportSource(ReportDataSource dataSource) {
super(true);
this.dataSource = dataSource;
index = 0;
}

public boolean next() throws JRException {
bean = dataSource.getObject(index++);
return (bean != null);
}

public void moveFirst() throws JRException {
index = 0;
bean = dataSource.getObject(index);
}

public Object getFieldValue(JRField field) throws JRException {
String nameField = getFieldName(field.getName());
return PropertyUtils.getProperty(bean, nameField);
}
/**
* Replace the character "_" by a ".".
*
* @param fieldName the name of the field
* @return the value in the cache or make
* the replacement and return this value
*/
private String getFieldName(String fieldName) {
String filteredFieldName
= (String) fieldNameMap.get(fieldName);
if (filteredFieldName == null) {
filteredFieldName = fieldName.replace('_','.');
fieldNameMap.put(fieldName,filteredFieldName);
}
return filteredFieldName;
}
}

---------------------------------------------------------------------------------------------------

This class is basically just a proxy between JasperReports and the Hibernate data source object. The only tricky bit is field name handling. For some reason, JasperReports does not accept field names containing dots (ex. "product.code"). However, when you retrieve a set of Hibernate-persisted business objects, you often need to access object attributes. To get around this, we replace the "." by a "_" in the JasperReport template (ex. "product_code" instead of "product.code"), and convert back to a conventional JavaBean format in the getFieldName() method.

Putting it all together
So, when you put it all together, you get something like this :

---------------------------------------------------------------------------------------------------
List results = session.find("from com.acme.Sale");

Map parameters = new HashMap();
parameters.put("Title", "Sales Report");

InputStream reportStream
= this.class.getResourceAsStream("/sales-report.xml");
JasperDesign jasperDesign
= JasperManager.loadXmlDesign(reportStream);
JasperReport jasperReport
= JasperManager.compileReport(jasperDesign);

ReportDataSource hibernateDataSource
= new ReportDataSourceImpl();
hibernateDataSource.setQueryProvider(new SalesQueryProvider());
hibernateDataSource.setCriteriaSet(salesCriteria);
ReportSource rs = new ReportSource(hibernateDataSource);

JasperPrint jasperPrint
= JasperManager.fillReport(jasperReport,
parameters,
rs);
JasperExportManager.exportReportTsoPdfFile(jasperPrint,
"sales-report.pdf");

---------------------------------------------------------------------------------------------------

Further JasperReports optimisations

Compiled Report caching
In the previous code, the JasperReport is loaded and compiled before it is run. In a serverside application, for optimal performance, the reports should be loaded and compiled once and then cached. This will save several seconds on each query generation.

Optimising Hibernate Queries
The first cause of slow report generation is sub-optimal querying. Hibernate is a high-performance persistence library which gives excellent results when correctly used. So you should treate any report which takes an excessive time to generate as suspicious. Common Hibernate optimisation strategies include :

Correct use of joins
Correct use of lazy associations
Reading a subset of columns rather than whole Hibernate-persisted objects
Some Hibernate query optimisation techniques are discussed here.

Conclusion

JasperReports is a powerful and flexible reporting tool. To achieve high-performance Hibernate intergration however, some extra work is needed. One way is by writing optimised data access classes which can be plugged into the JasperReports architecture. Using this approach, you can take advantage of the full power of Hibernate in your JasperReports reporting solutions.

matthew 2006-06-29 20:00 发表评论

jasper report 使用 hibernate 数据�?�?hibernate 官方�|�站提供)

matthew — Thu, 29 Jun 2006 11:58:00 GMT

�? 此方法��用简单，但是没有分页��d��数据�Q�适合数据量不大情况下的报�?br />
原文�Q?/font> http://www.hibernate.org/79.html

Using JasperReports with Hibernate
This section will demonstrate a couple of ways to use the results of a Hibernate query as the datasource of a report in JasperReports.

When the Hibernate query returns a simple collection of objects, The JRBeanCollectionDataSource class in the JasperReports library will work fine.

--------------------------------------------------------------------------------------------------------
List cats = session.find("from eg.Cat");

Map parameters = new HashMap();
parameters.put("Title", "The Cat Report");

InputStream reportStream = this.class.getResourceAsStream("/the-cat-report.xml");
JasperDesign jasperDesign = JasperManager.loadXmlDesign(reportStream);
JasperReport jasperReport = JasperManager.compileReport(jasperDesign);

JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(cats);
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport, parameters, ds);

JasperManager.printReportToPdfFile(jasperPrint, "the-cat-report.pdf");

--------------------------------------------------------------------------------------------------------

However, when the Hibernate query returns tuples of objects (each tuple as an array, each array as an element in the returned List), things get a little tricky. Jasper needs a way to reference each object in the array by a field name. This class is a good solution, but at this time you are required to pass an array of field names matching the results of the query.

--------------------------------------------------------------------------------------------------------
public class HibernateQueryResultDataSource implements JRDataSource {

private String[] fields;
private Iterator iterator;
private Object currentValue;

public HibernateQueryResultDataSource(List list, String[] fields) {
this.fields = fields;
this.iterator = list.iterator();
}

public Object getFieldValue(JRField field) throws JRException {
Object value = null;
int index = getFieldIndex(field.getName());
if (index > -1) {
Object[] values = (Object[])currentValue;
value = values[index];
}
return value;
}

public boolean next() throws JRException {
currentValue = iterator.hasNext() ? iterator.next() : null;
return (currentValue != null);
}

private int getFieldIndex(String field) {
int index = -1;
for (int i = 0; i < fields.length; i++) {
if (fields .equals(field)) {
index = i;
break;
}
}
return index;
}

}

--------------------------------------------------------------------------------------------------------

Now running your report would look something like this:

--------------------------------------------------------------------------------------------------------
List cats = session.find("select cat.type, cat.birthdate, cat.name from eg.DomesticCat cat");

Map parameters = new HashMap();
parameters.put("Title", "The Cat Report");

InputStream reportStream = this.class.getResourceAsStream("/the-cat-report.xml");
JasperDesign jasperDesign = JasperManager.loadXmlDesign(reportStream);
JasperReport jasperReport = JasperManager.compileReport(jasperDesign);

String[] fields = new String[] { "type", "birthdate", "name"};
HibernateQueryResultDataSource ds = new HibernateQueryResultDataSource(cats, fields);
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport, parameters, ds);

JasperManager.printReportToPdfFile(jasperPrint, "the-cat-report.pdf");

--------------------------------------------------------------------------------------------------------

Another, alternate implementation, from Erik Romson:

--------------------------------------------------------------------------------------------------------
public class HibernateQueryResultDataSource implements JRDataSource
{
private static final transient Logger logger =
Logger.Factory.getInstance(HibernateQueryResultDataSource.class);
protected HashMap fieldsToIdxMap=new HashMap();
protected Iterator iterator;
protected Object currentValue;
List values;

public HibernateQueryResultDataSource(List list, String query)
{
int start =query.indexOf("select ");
int stop =query.indexOf(" from ");
Assertion.assertTrue(
(start!=-1) &&
(stop!=-1),
"The query "+
query+
" must be of the form select x,x from ..."
);
start+="select".length();
String parameters=query.substring(start,stop);
parameters=parameters.trim();
Assertion.assertTrue(
parameters.length()>0,
"The query "+
query+
" seems to be weird"
);
StringTokenizer tokenizer=new StringTokenizer(parameters,",");
int idx=0;
while( tokenizer.hasMoreTokens() )
{
String parameter=tokenizer.nextToken();
fieldsToIdxMap.put( parameter.trim(), new Integer(idx) );
idx++;
}
values=list;
this.iterator = list.iterator();
}
public Object getFieldValue(JRField field) throws JRException
{
String fieldName=field.getName().replace('_','.');
//JasperReports does not allow '.' in field names, so we
//use '_' for nested properties instead and must convert here
//(comment added by kbrown)
Integer idxInt=(Integer) fieldsToIdxMap.get(fieldName);
if (idxInt==null)
{
Assertion.fail(
"The field \""+
fieldName+
"\" did not have an index mapping. Should be one off "+
fieldsToIdxMap.keySet()
);
}
Object[] values = (Object[]) currentValue;
Assertion.assertTrue(
idxInt.intValue()
"The index from field "+
fieldName+
" was illegal"
);
Object value= values[ idxInt.intValue() ];
if ( logger.isDebugEnabled() )
{
logger.debug("fetched value "+value+" from field "+fieldName);
}
return value;
}

public boolean next() throws JRException
{
currentValue = iterator.hasNext() ? iterator.next() : null;
return currentValue != null;
}

public List getValues()
{
return values;
}
}

--------------------------------------------------------------------------------------------------------

Using JasperReports with Hibernate
This section will demonstrate a couple of ways to use the results of a Hibernate query as the datasource of a report in JasperReports.

When the Hibernate query returns a simple collection of objects, The JRBeanCollectionDataSource class in the JasperReports library will work fine.

List cats = session.find("from eg.Cat");

Map parameters = new HashMap();
parameters.put("Title", "The Cat Report");

InputStream reportStream = this.class.getResourceAsStream("/the-cat-report.xml");
JasperDesign jasperDesign = JasperManager.loadXmlDesign(reportStream);
JasperReport jasperReport = JasperManager.compileReport(jasperDesign);

JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(cats);
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport, parameters, ds);

JasperManager.printReportToPdfFile(jasperPrint, "the-cat-report.pdf");
However, when the Hibernate query returns tuples of objects (each tuple as an array, each array as an element in the returned List), things get a little tricky. Jasper needs a way to reference each object in the array by a field name. This class is a good solution, but at this time you are required to pass an array of field names matching the results of the query.

public class HibernateQueryResultDataSource implements JRDataSource {

private String[] fields;
private Iterator iterator;
private Object currentValue;

public HibernateQueryResultDataSource(List list, String[] fields) {
this.fields = fields;
this.iterator = list.iterator();
}

public Object getFieldValue(JRField field) throws JRException {
Object value = null;
int index = getFieldIndex(field.getName());
if (index > -1) {
Object[] values = (Object[])currentValue;
value = values[index];
}
return value;
}

public boolean next() throws JRException {
currentValue = iterator.hasNext() ? iterator.next() : null;
return (currentValue != null);
}

private int getFieldIndex(String field) {
int index = -1;
for (int i = 0; i < fields.length; i++) {
if (fields .equals(field)) {
index = i;
break;
}
}
return index;
}

}
Now running your report would look something like this:

List cats = session.find("select cat.type, cat.birthdate, cat.name from eg.DomesticCat cat");

Map parameters = new HashMap();
parameters.put("Title", "The Cat Report");

InputStream reportStream = this.class.getResourceAsStream("/the-cat-report.xml");
JasperDesign jasperDesign = JasperManager.loadXmlDesign(reportStream);
JasperReport jasperReport = JasperManager.compileReport(jasperDesign);

String[] fields = new String[] { "type", "birthdate", "name"};
HibernateQueryResultDataSource ds = new HibernateQueryResultDataSource(cats, fields);
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport, parameters, ds);

JasperManager.printReportToPdfFile(jasperPrint, "the-cat-report.pdf");

--------------------------------------------------------------------------------

Another, alternate implementation, from Erik Romson:

public class HibernateQueryResultDataSource implements JRDataSource
{
private static final transient Logger logger =
Logger.Factory.getInstance(HibernateQueryResultDataSource.class);
protected HashMap fieldsToIdxMap=new HashMap();
protected Iterator iterator;
protected Object currentValue;
List values;

public HibernateQueryResultDataSource(List list, String query)
{
int start =query.indexOf("select ");
int stop =query.indexOf(" from ");
Assertion.assertTrue(
(start!=-1) &&
(stop!=-1),
"The query "+
query+
" must be of the form select x,x from ..."
);
start+="select".length();
String parameters=query.substring(start,stop);
parameters=parameters.trim();
Assertion.assertTrue(
parameters.length()>0,
"The query "+
query+
" seems to be weird"
);
StringTokenizer tokenizer=new StringTokenizer(parameters,",");
int idx=0;
while( tokenizer.hasMoreTokens() )
{
String parameter=tokenizer.nextToken();
fieldsToIdxMap.put( parameter.trim(), new Integer(idx) );
idx++;
}
values=list;
this.iterator = list.iterator();
}

public Object getFieldValue(JRField field) throws JRException
{
String fieldName=field.getName().replace('_','.');
//JasperReports does not allow '.' in field names, so we
//use '_' for nested properties instead and must convert here
//(comment added by kbrown)
Integer idxInt=(Integer) fieldsToIdxMap.get(fieldName);
if (idxInt==null)
{
Assertion.fail(
"The field \""+
fieldName+
"\" did not have an index mapping. Should be one off "+
fieldsToIdxMap.keySet()
);
}
Object[] values = (Object[]) currentValue;
Assertion.assertTrue(
idxInt.intValue()
"The index from field "+
fieldName+
" was illegal"
);
Object value= values[ idxInt.intValue() ];
if ( logger.isDebugEnabled() )
{
logger.debug("fetched value "+value+" from field "+fieldName);
}
return value;
}

public boolean next() throws JRException
{
currentValue = iterator.hasNext() ? iterator.next() : null;
return currentValue != null;
}

public List getValues()
{
return values;
}
}

--------------------------------------------------------------------------------

Using the information from this page I've made a patch to JasperReports 0.6.5. You can find the patch at: http://www.waltermourao.com.br/JasperReports/jr65_hql.zip or you can download the full version from: http://www.waltermourao.com.br/JasperReports/jasperreports-hql-0.6.5.zip

matthew 2006-06-29 19:58 发表评论

matthew — Wed, 07 Jun 2006 01:30:00 GMT
摘要: JasperReport 用户手册的翻�? 1 ��? JasperReport 是一个强大、灵�zȝ��报表生成工具�Q�能够展�C�Z��富的��面内容... 阅读全文

matthew 2006-06-07 09:30 发表评论

jasperreport+ireport报表设计中遇到的问题

matthew — Tue, 06 Jun 2006 11:43:00 GMT
今天是个好日子，200666。把自己�q�段旉��遇到的几个问题记录下来吧�?br />问题1:最常见的问题就是中文问题，不能昄��中文或者是��q��?br />解决办法�Q�在需要显�C�Z��文的field里面(包括静态的)讄��PDF font name:STSong-Light,PDF encoding:UniGB-UCS2-H (Chinese Simplified)。即可！

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问题3:当输出HTML格式报表时��L��出现�I�白��问题�?br />解决办法:原因是我用的jasperreport版本�?.2.2,在这个版本中出现一个小bug�Q�就是编译输出的html源代码�ؓ�Q�IE不能�~�译。办法是修改源码�Q�或者手工添加代码把改�ؓ�Q�最后也可以把你的lib目录下的jasperreport的jar包的版本换�ؓ1.2.1
....待箋

matthew 2006-06-06 19:43 发表评论

matthew — Tue, 06 Jun 2006 11:11:00 GMT
摘要: �W�一部分�Q��用iReport制作报表的详�l�过�E�（Windows环境下） 1 、前�a� 在网�l�上可以搜烦到很多��? iReport �? Jasperreport 配合实现各种报表��d��的文章，但是我觉得很��有一��（几乎没有�Q�做一个比较详�l�的介绍如何使用... 阅读全文

matthew 2006-06-06 19:11 发表评论

关于Java报表�Q�jasperreport

matthew — Tue, 06 Jun 2006 10:53:00 GMT
新开了个Blog,该填点东西进来呵。这�D�|��间由于种�U�原因在研究B/S架构下的报表设计�Q�也早想写点自己的经验记录自��q��学习�q�程。�ȝ��感觉报表是个比较�ȝ��的东西，��是个细致活。我会在往后的学习中把一些遇到的问题和解军_��法记录下来，首先�q�是贴点别�h的文章吧。。�?img src ="http://www.aygfsteel.com/matthew2006/aggbug/50868.html" width = "1" height = "1" />

matthew 2006-06-06 18:53 发表评论