java實現(xiàn)各種數(shù)據(jù)統(tǒng)計圖

./java實現(xiàn)各種數(shù)據(jù)統(tǒng)計圖〔柱形圖,餅圖,折線圖分類：

Java2012-05-2422:28

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評論<29>

收藏\o"舉報"舉報javajfreechartdatasetapplicationclassproperties最近在做數(shù)據(jù)挖掘的課程設計,需要將數(shù)據(jù)分析的結果很直觀的展現(xiàn)給用戶,這就要用到數(shù)據(jù)統(tǒng)計圖,要實現(xiàn)這個功能就需要幾個第三方包了：3.

gnujaxp.jar先來看一下,最終效果圖：主要是,但這三個包要齊全,我已經(jīng)將所有與jfreechart有關的jar包與本文實例的工程〔代碼一同壓縮上傳了,有興趣的同學可以下載,下載地址：接下來,我們一步步來實現(xiàn)本程序。一,前期準備工作,也就把這三個第三方包添加進本文工程,添加過程特別簡單,前面寫過一篇博客,講的是java如何讀取Excel表格中的數(shù)據(jù)〔有興趣的同學可以看一看:,也要添加第三方包,添加過程一模一樣,這里我們在復習一遍：1,建,立java項目,在這個項目在建立一個新的文件夾lib；2,將上述三個jar包,復制到lib3,然后右鍵點擊這個java項目,選擇Properties4,在左側列表里選中JavaBuildPath,右側選中Libraries5,點擊AddJARs6,然后去選擇這個項目中l(wèi)ib文件夾中的三個jar,點擊確定成功后,項目中會多一個文件夾為：ReferencedLibraries二,實現(xiàn)柱形圖的java代碼：[plain]viewplaincopy

import

java.awt.Font;

import

org.jfree.chart.ChartFactory;

import

org.jfree.chart.ChartPanel;

import

org.jfree.chart.JFreeChart;

import

org.jfree.chart.axis.CategoryAxis;

import

org.jfree.chart.axis.ValueAxis;

import

org.jfree.chart.plot.CategoryPlot;

import

org.jfree.chart.plot.PlotOrientation;

import

org.jfree.data.category.CategoryDataset;

import

org.jfree.data.category.DefaultCategoryDataset;

public

class

BarChart

{

ChartPanel

frame1;

public

BarChart<>{

CategoryDataset

dataset

=

getDataSet<>;

JFreeChart

chart

=

ChartFactory.createBarChart3D<

"水果",

//

圖表標題

"水果種類",

//

目錄軸的顯示標簽

"數(shù)量",

//

數(shù)值軸的顯示標簽

dataset,

//

數(shù)據(jù)集

PlotOrientation.VERTICAL,

//

圖表方向：水平、垂直

true,

//

是否顯示圖例<對于簡單的柱狀圖必須是false>

false,

//

是否生成工具

false

//

是否生成URL

>;

//從這里開始

CategoryPlot

plot=chart.getCategoryPlot<>;//獲取圖表區(qū)域對象

CategoryAxis

domainAxis=plot.getDomainAxis<>;

//水平底部列表

domainAxis.setLabelFont<new

Font<"黑體",Font.BOLD,14>>;

//水平底部標題

domainAxis.setTickLabelFont<new

Font<"宋體",Font.BOLD,12>>;

//垂直標題

ValueAxis

rangeAxis=plot.getRangeAxis<>;//獲取柱狀

rangeAxis.setLabelFont<new

Font<"黑體",Font.BOLD,15>>;

chart.getLegend<>.setItemFont<new

Font<"黑體",

Font.BOLD,

15>>;

chart.getTitle<>.setFont<new

Font<"宋體",Font.BOLD,20>>;//設置標題字體

//到這里結束,雖然代碼有點多,但只為一個目的,解決漢字亂碼問題

frame1=new

ChartPanel<chart,true>;

//這里也可以用chartFrame,可以直接生成一個獨立的Frame

}

private

static

CategoryDataset

getDataSet<>

{

DefaultCategoryDataset

dataset

=

new

DefaultCategoryDataset<>;

dataset.addValue<100,

"",

"蘋果">;

dataset.addValue<100,

"",

"蘋果">;

dataset.addValue<100,

"",

"蘋果">;

dataset.addValue<200,

"",

"梨子">;

dataset.addValue<200,

"",

"梨子">;

dataset.addValue<200,

"",

"梨子">;

dataset.addValue<300,

"",

"葡萄">;

dataset.addValue<300,

"",

"葡萄">;

dataset.addValue<300,

"",

"葡萄">;

dataset.addValue<400,

"",

"香蕉">;

dataset.addValue<400,

"",

"香蕉">;

dataset.addValue<400,

"",

"香蕉">;

dataset.addValue<500,

"",

"荔枝">;

dataset.addValue<500,

"",

"荔枝">;

dataset.addValue<500,

"",

"荔枝">;

return

dataset;

}

public

ChartPanel

getChartPanel<>{

return

frame1;

}

}

效果圖如下：但我們把private

static

CategoryDatasetgetDataSet<>{}方法中的數(shù)據(jù)變化一下后,又會形成另一種效果,比如說我們改成：[plain]viewplaincopyprivate

static

CategoryDataset

getDataSet<>

{

DefaultCategoryDataset

dataset

=

new

DefaultCategoryDataset<>;

dataset.addValue<100,

"蘋果",

"蘋果">;

dataset.addValue<200,

"梨子",

"梨子">;

dataset.addValue<300,

"葡萄",

"葡萄">;

dataset.addValue<400,

"香蕉",

"香蕉">;

dataset.addValue<500,

"荔枝",

"荔枝">;

return

dataset;

}

效果圖如下：三,實現(xiàn)餅狀圖的java代碼：[plain]viewplaincopy

package

.njue.testJFreeChart;

import

java.awt.Font;

import

java.text.DecimalFormat;

import

java.text.NumberFormat;

import

javax.swing.JPanel;

import

org.jfree.chart.ChartFactory;

import

org.jfree.chart.ChartPanel;

import

org.jfree.chart.JFreeChart;

import

org.jfree.chart.labels.StandardPieSectionLabelGenerator;

import

org.jfree.chart.plot.PiePlot;

al.DefaultPieDataset;

public

class

PieChart

{

ChartPanel

frame1;

public

PieChart<>{

DefaultPieDataset

data

=

getDataSet<>;

JFreeChart

chart

=

ChartFactory.createPieChart3D<"水果產(chǎn)量",data,true,false,false>;

//設置百分比

PiePlot

pieplot

=

<PiePlot>

chart.getPlot<>;

DecimalFormat

df

=

new

DecimalFormat<"0.00%">;//獲得一個DecimalFormat對象,主要是設置小數(shù)問題

NumberFormat

nf

=

NumberFormat.getNumberInstance<>;//獲得一個NumberFormat對象

StandardPieSectionLabelGenerator

sp1

=

new

StandardPieSectionLabelGenerator<"{0}

{2}",

nf,

df>;//獲得StandardPieSectionLabelGenerator對象

pieplot.setLabelGenerator<sp1>;//設置餅圖顯示百分比

//沒有數(shù)據(jù)的時候顯示的容

pieplot.setNoDataMessage<"無數(shù)據(jù)顯示">;

pieplot.setCircular<false>;

pieplot.setLabelGap<0.02D>;

pieplot.setIgnoreNullValues<true>;//設置不顯示空值

pieplot.setIgnoreZeroValues<true>;//設置不顯示負值

frame1=new

ChartPanel

<chart,true>;

chart.getTitle<>.setFont<new

Font<"宋體",Font.BOLD,20>>;//設置標題字體

PiePlot

piePlot=

<PiePlot>

chart.getPlot<>;//獲取圖表區(qū)域對象

piePlot.setLabelFont<new

Font<"宋體",Font.BOLD,10>>;//解決亂碼

chart.getLegend<>.setItemFont<new

Font<"黑體",Font.BOLD,10>>;

}

private

static

DefaultPieDataset

getDataSet<>

{

DefaultPieDataset

dataset

=

new

DefaultPieDataset<>;

dataset.setValue<"蘋果",100>;

dataset.setValue<"梨子",200>;

dataset.setValue<"葡萄",300>;

dataset.setValue<"香蕉",400>;

dataset.setValue<"荔枝",500>;

return

dataset;

}

public

ChartPanel

getChartPanel<>{

return

frame1;

}

}

效果圖如下：四,實現(xiàn)折線圖的java代碼：[plain]viewplaincopypackage

.njue.testJFreeChart;

import

java.awt.Font;

import

java.text.SimpleDateFormat;

import

org.jfree.chart.ChartFactory;

import

org.jfree.chart.ChartPanel;

import

org.jfree.chart.JFreeChart;

import

org.jfree.chart.axis.DateAxis;

import

org.jfree.chart.axis.ValueAxis;

import

org.jfree.chart.plot.XYPlot;

import

org.jfree.data.time.Month;

import

org.jfree.data.time.TimeSeries;

import

org.jfree.data.time.TimeSeriesCollection;

import

org.jfree.data.xy.XYDataset;

public

class

TimeSeriesChart

{

ChartPanel

frame1;

public

TimeSeriesChart<>{

XYDataset

xydataset

=

createDataset<>;

JFreeChart

jfreechart

=

ChartFactory.createTimeSeriesChart<"Legal

&

General單位信托基金價格",

"日期",

"價格",xydataset,

true,

true,

true>;

XYPlot

xyplot

=

<XYPlot>

jfreechart.getPlot<>;

DateAxis

dateaxis

=

<DateAxis>

xyplot.getDomainAxis<>;

dateaxis.setDateFormatOverride<new

SimpleDateFormat<"MMM-yyyy">>;

frame1=new

ChartPanel<jfreechart,true>;

dateaxis.setLabelFont<new

Font<"黑體",Font.BOLD,14>>;

//水平底部標題

dateaxis.setTickLabelFont<new

Font<"宋體",Font.BOLD,12>>;

//垂直標題

ValueAxis

rangeAxis=xyplot.getRangeAxis<>;//獲取柱狀

rangeAxis.setLabelFont<new

Font<"黑體",Font.BOLD,15>>;

jfreechart.getLegend<>.setItemFont<new

Font<"黑體",

Font.BOLD,

15>>;

jfreechart.getTitle<>.setFont<new

Font<"宋體",Font.BOLD,20>>;//設置標題字體

}

private

static

XYDataset

createDataset<>

{

//這個數(shù)據(jù)集有點多,但都不難理解

TimeSeries

timeseries

=

new

TimeSeries<"legal

&

general歐洲指數(shù)信任",

org.jfree.data.time.Month.class>;

timeseries.add<new

Month<2,

2001>,

181.001D>;

timeseries.add<new

Month<3,

2001>,

167.001D>;

timeseries.add<new

Month<4,

2001>,

153.001D>;

timeseries.add<new

Month<5,

2001>,

167.999D>;

timeseries.add<new

Month<6,

2001>,

158.001D>;

timeseries.add<new

Month<7,

2001>,

148.001D>;

timeseries.add<new

Month<8,

2001>,

153.001D>;

timeseries.add<new

Month<9,

2001>,

142.999D>;

timeseries.add<new

Month<10,

2001>,

123.2D>;

timeseries.add<new

Month<11,

2001>,

131.001D>;

timeseries.add<new

Month<12,

2001>,

139.999D>;

timeseries.add<new

Month<1,

2002>,

142.001D>;

timeseries.add<new

Month<2,

2002>,

138.999D>;

timeseries.add<new

Month<3,

2002>,

137.001D>;

timeseries.add<new

Month<4,

2002>,

143.001D>;

timeseries.add<new

Month<5,

2002>,

139.001D>;

timeseries.add<new

Month<6,

2002>,

137D>;

timeseries.add<new

Month<7,

2002>,

132.001D>;

TimeSeries

timeseries1

=

new

TimeSeries<"legal

&

general英國指數(shù)信任",

org.jfree.data.time.Month.class>;

timeseries1.add<new

Month<2,

2001>,

129.999D>;

timeseries1.add<new

Month<3,

2001>,

123.2D>;

timeseries1.add<new

Month<4,

2001>,

117.2D>;

timeseries1.add<new

Month<5,

2001>,

124.999D>;

timeseries1.add<new

Month<6,

2001>,

122.999D>;

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>,

106.999D>;

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>,

109.999D>;

timeseries1.add<new

Month<4,

2002>,

113.2D>;

timeseries1.add<new

Month<5,

2002>,

111.999D>;

timeseries1.add<new

Month<6,

2002>,

108.8D>;

timeseries1.add<new

Month<7,

2002>,

101.999D>;

TimeSeriesCollection

timeseriescollection

=

new

TimeSeriesCollection<>;

timeseriescollection.addSeries<timeseries>;

timeseriescollection.addSeries<timeseries1>;

return

timeseriescollection;

}

public

ChartPanel

getChartPanel<>{

return

frame1;

}

}

效果圖如下：再來看一下主方法：[plain]viewplaincopyimport

java.awt.GridLayout;

import

javax.swing.JFrame;

public

class

mainClass

{

public

static

void

main<String

args[]>{

JFrame

frame=new

JFrame<"Java數(shù)據(jù)統(tǒng)計圖">;

frame.setLayout<new

GridLayout<2,2,10,10>>;

frame.add<new

BarChart<>.getChartPanel<>>;

//添加柱形圖

frame.add<new

BarChart1<>.getChartPanel<>>;

//添加柱形圖的另一種效果

frame.add<new

PieChart<>.getChartPanel<>>;

//添加餅狀圖

frame.add<new

TimeSeriesChart<>.getChartPanel<>>;

//添加折線圖

frame.setBounds<50,

50,

800,

600>;

frame.setVisible<true>;

}

}

五,總結以上都是一個簡單的例子去實現(xiàn)了,想了解更深的同學可自行查詢資料,其實以上代碼都通俗易懂,只要結合自己的實際情況,便可開發(fā)出屬于自己的Application,大家可以看出我這里是在Application上實現(xiàn)的,其實更多情況數(shù)據(jù)統(tǒng)計圖在javaweb上應用更多,大家也可自行了解。ps:如運行本文工程項目是出現(xiàn)錯誤,請參考博文：JFreeChart入學教程2011-08-0814:55:19|

分類：技術篇|舉報|字號訂閱JFreeChart是一組功能強大、靈活易用的Java繪圖API,使用它可以生成多種通用性的報表,包括柱狀圖、餅圖、曲線圖、甘特圖等。它能夠用在Swing和Web等中制作自定義的圖表或報表,并且得到廣泛的應用。本文將通過引領讀者學習在JFreeChart中餅圖、柱狀圖和曲線圖的進階應用,來達到熟練使用JFreeChart的目的。

一．下載與環(huán)境配置

1.下載JFreeChart

JFreeChart是開放源代碼的免費軟件,但是它的支持文檔需要付費才能得到。其下載地址為：/project/showfiles.php?group_id=15494,當前最新版本為1.0.13。筆者下載的是1.0.13最新版。

說明：1source目錄：為jfreechart的源碼目錄；

2lib目錄：為包目錄,我們需要關注的包為jfreechart-1.0.13.jar、gnujaxp.jar和jcommon-1.0.16.jar這三個包；

3根目錄下的jfreechart-1.0.13-demo.jar是例子程序,大家雙擊后可看到其中有很多例子的運行結果。

2.環(huán)境配置

筆者的開發(fā)環(huán)境如下：

JDK：1.6

MyEclipse：6.6

Tomcat：6.0.18

為了后續(xù)的"用JFreeChart創(chuàng)建基于Web的圖表"的一個例子的展示,我們在MyEclipse中創(chuàng)建一個名為jfreechart的Web工程。將下載的JFreeChart1.0.6下lib目錄下的jar包拷貝到WebRoot/WEB-INF/lib目錄下。另外還需要在web.xml文件中增加如下配置：

<servlet>

<servlet-name>DisplayChart</servlet-name>

<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>DisplayChart</servlet-name>

<url-pattern>/DisplayChart</url-pattern>

</servlet-mapping>

二．

柱狀圖

在WebRoot目錄下建立bar目錄,用來存放柱狀圖的各個例子。首先在該目錄下建立一個sample1.jsp文件,讓我們來看一個簡單的柱狀圖的例子,修改后的sample1.jsp的容如下所示：

<%pagecontentType="text/html;charset=GBK"%><%pageimport="org.jfree.chart.ChartFactory,

org.jfree.chart.JFreeChart,

org.jfree.chart.plot.PlotOrientation,

org.jfree.chart.servlet.ServletUtilities,

org.jfree.data.category.DefaultCategoryDataset"%><%

DefaultCategoryDatasetdataset=newDefaultCategoryDataset<>;

dataset.addValue<610,"Guangzhou","Pig">;

dataset.addValue<220,"Guangzhou","Beef">;

dataset.addValue<530,"Guangzhou","Chicken">;

dataset.addValue<340,"Guangzhou","Fish">;JFreeChartchart=ChartFactory.createBarChart3D<"肉類銷量統(tǒng)計圖",

"type",

"amount",

dataset,

PlotOrientation.VERTICAL,

false,

false,

false>;

Stringfilename=ServletUtilities.saveChartAsPNG<chart,500,300,null,session>;

StringgraphURL=request.getContextPath<>+"/DisplayChart?filename="+filename;

%>

<imgsrc="<%=graphURL%>"width=500height=300border=0usemap="#<%=filename%>">

在瀏覽器中輸入地址：localhost:8080/jfreechart/bar/sample1.jsp,可看到如下柱狀圖：

上面的這個柱狀圖比較簡單,稍顯單調,在有些情況下,我們需要用不同顏色來表示不同的種類,或者在種類上標上具體數(shù)值,亦或需要加上3D水晶效果。下面讓我們來做更深一步的探討。接下來讓我們看一個用不同顏色來表示不通種類的例子。在WebRoot的bar目錄下新建sample2.jsp頁面,將其代碼修改如下：

<%pagecontentType="text/html;charset=GBK"%><%pageimport="org.jfree.chart.ChartFactory,

org.jfree.chart.JFreeChart,

org.jfree.chart.plot.PlotOrientation,

org.jfree.chart.servlet.ServletUtilities,

org.jfree.data.category.CategoryDataset,

org.jfree.data.general.DatasetUtilities"%><%

double[][]data=newdouble[][]{{1310},{720},{1130},{440}};

String[]rowKeys={"pig","beef","chicken","fish"};

String[]columnKeys={""};

CategoryDatasetdataset=DatasetUtilities.createCategoryDataset<rowKeys,columnKeys,data>;

JFreeChartchart=ChartFactory.createBarChart3D<"肉類銷量統(tǒng)計圖",

"type",

"amount",

dataset,

PlotOrientation.VERTICAL,

true,

false,

false>;

Stringfilename=ServletUtilities.saveChartAsPNG<chart,500,300,null,session>;

StringgraphURL=request.getContextPath<>+"/DisplayChart?filename="+filename;

%>

<imgsrc="<%=graphURL%>"width=500height=300border=0usemap="#<%=filename%>">

該頁面的運行效果如下圖所示：

對比該例與前例,可看出createBarChart3D的倒數(shù)第三個參數(shù)修改成了true,該參數(shù)可用來顯示下方的方框。上兩例我們顯示的只是一個城市的肉類銷量,有時候我們有對比顯示多個城市的不同肉類,只要將上例稍作修改即可。例如要在圖中表示、、、四個城市的四個肉類的銷售情況,只需要將如下三句稍做修改：

double[][]data=newdouble[][]{{1310},{720},{1130},{440}};

String[]rowKeys={"pig","beef","chicken","fish"};

String[]columnKeys={""};

例如修改成：

double[][]data=newdouble[][]{{1310,1220,1110,1000},

{720,700,680,640},

{1130,1020,980,800},

{440,400,360,300}};

String[]rowKeys={"pig","beef","chicken","fish"};String[]columnKeys={"Guangzhou","Shenzhen","Dongguan","Foshan"};

在運行該jsp頁面,可看到如下界面：

在上述幾例中,在某個柱子上都沒有顯示相應的數(shù)值,下面讓我們?yōu)槊總€柱子都加上它的數(shù)值,我們新建一個sample4.jsp頁面,其容如下：

<%pagecontentType="text/html;charset=GBK"%><%pageimport="org.jfree.chart.ChartFactory,

org.jfree.chart.JFreeChart,

org.jfree.chart.plot.PlotOrientation,

org.jfree.chart.servlet.ServletUtilities,

org.jfree.data.category.CategoryDataset,

org.jfree.data.general.DatasetUtilities,

org.jfree.chart.plot.*,

org.jfree.chart.labels.*,

org.jfree.chart.renderer.category.BarRenderer3D,

java.awt.*,

org.jfree.ui.*,

org.jfree.chart.axis.AxisLocation"%><%

double[][]data=newdouble[][]{{1310,1220,1110,1000},

{720,700,680,640},

{1130,1020,980,800},

{440,400,360,300}};

String[]rowKeys={"pig","beef","chicken","fish"};

String[]columnKeys={"Guangzhou","Shenzhen","Dongguan","Foshan"};

CategoryDatasetdataset=DatasetUtilities.createCategoryDataset<rowKeys,columnKeys,data>;

JFreeChartchart=ChartFactory.createBarChart3D<"肉類銷量統(tǒng)計圖",

"type",

"amount",

dataset,

PlotOrientation.VERTICAL,

true,

true,

false>;

CategoryPlotplot=chart.getCategoryPlot<>;

//設置網(wǎng)格背景顏色

plot.setBackgroundPaint<Color.white>;

//設置網(wǎng)格豎線顏色

plot.setDomainGridlinePaint<Color.pink>;

//設置網(wǎng)格橫線顏色

plot.setRangeGridlinePaint<Color.pink>;

//顯示每個柱的數(shù)值,并修改該數(shù)值的字體屬性

BarRenderer3Drenderer=newBarRenderer3D<>;

renderer.setBaseItemLabelGenerator<newStandardCategoryItemLabelGenerator<>>;

renderer.setBaseItemLabelsVisible<true>;

//默認的數(shù)字顯示在柱子中,通過如下兩句可調整數(shù)字的顯示

//注意：此句很關鍵,若無此句,那數(shù)字的顯示會被覆蓋,給人數(shù)字沒有顯示出來的問題

renderer.setBasePositiveItemLabelPosition<newItemLabelPosition<ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_LEFT>>;

renderer.setItemLabelAnchorOffset<10D>;

//設置每個地區(qū)所包含的平行柱的之間距離

//renderer.setItemMargin<0.3>;

plot.setRenderer<renderer>;

//設置地區(qū)、銷量的顯示位置

//將下方的"肉類"放到上方

plot.setDomainAxisLocation<AxisLocation.TOP_OR_RIGHT>;

//將默認放在左邊的"銷量"放到右方

plot.setRangeAxisLocation<AxisLocation.BOTTOM_OR_RIGHT>;

Stringfilename=ServletUtilities.saveChartAsPNG<chart,700,400,null,session>;

StringgraphURL=request.getContextPath<>+"/DisplayChart?filename="+filename;

%>

<imgsrc="<%=graphURL%>"width=700height=400border=0usemap="#<%=filename%>">

運行效果如下所示：

注意：jfreechart的很多版本不兼容,請大家在運行此例時確認下載了對應的版本。

三．

餅圖

在WebRoot目錄下建立名為pie的子目錄,用來存放本教程中餅圖的實例jsp頁面。下面讓我們來看一個簡單的三維餅圖。首先在pie目錄下建立一個名為sample1.jsp的頁面。

在JFreeChart中,與餅圖繪制密切相關的類如下：

1

PiePlot

餅圖繪制類,可以用來設置餅圖的相關屬性。例如：

PiePlotpieplot=<PiePlot>jfreechart.getPlot<>;

pieplot.setLabelFont<newFont<"SansSerif",0,12>>;

pieplot.setNoDataMessage<"Nodataavailable">;

pieplot.setCircular<false>;

pieplot.setLabelGap<0.02D>;

2

DefaultPieDataset

默認的餅圖數(shù)據(jù)集類,用來存儲餅圖顯示的相關數(shù)據(jù)信息。例如：

DefaultPieDatasetdataset=newDefaultPieDataset<>;

dataset.setValue<"品德",newDouble<0.2D>>;

dataset.setValue<"體育",newDouble<0.2D>>;

dataset.setValue<"音樂",newDouble<0.2D>>;

dataset.setValue<"其余成績",newDouble<0.4D>>;

3

ChartFactory

可利用該制圖工廠類createPieChart來創(chuàng)建一個餅圖的JFreeChart對象,例如：

JFreeChartjfreechart=ChartFactory.createPieChart<"餅圖示例",dataset,true,true,false>;

下面讓我們看一個簡單的例子,修改sample1.jsp的容如下：

<%pagecontentType="text/html;charset=GBK"%>

<%pageimport="org.jfree.chart.*,

org.jfree.chart.plot.PiePlot,

org.jfree.data.general.DefaultPieDataset,

org.jfree.chart.servlet.ServletUtilities,

java.awt.*"%>

<%

//設置數(shù)據(jù)集

DefaultPieDatasetdataset=newDefaultPieDataset<>;

dataset.setValue<"初中高級程序員",0.55>;

dataset.setValue<"項目經(jīng)理",0.1>;

dataset.setValue<"系統(tǒng)分析師",0.1>;

dataset.setValue<"軟件架構師",0.1>;

dataset.setValue<"其他",0.2>;

//通過工廠類生成JFreeChart對象

JFreeChartchart=ChartFactory.createPieChart3D<"IT行業(yè)職業(yè)分布圖",dataset,true,false,false>;

PiePlotpieplot=<PiePlot>chart.getPlot<>;

pieplot.setLabelFont<newFont<"宋體",0,12>>;

//沒有數(shù)據(jù)的時候顯示的容

pieplot.setNoDataMessage<"無數(shù)據(jù)顯示">;

pieplot.setCircular<false>;

pieplot.setLabelGap<0.02D>;

Stringfilename=ServletUtilities.saveChartAsPNG<chart,500,300,null,session>;

StringgraphURL=request.getContextPath<>+"/DisplayChart?filename="+filename;

%>

<imgsrc="<%=graphURL%>"width=500height=300border=0usemap="#<%=filename%>">

可以看出,餅圖的繪制與柱狀圖的繪制類似,該例的運行效果如下：通過JFreeChart還可以提供漂亮的水晶餅圖效果,接著讓我們新建一個sample3.jsp頁面來體驗一下超炫美圖吧。修改sample3.jsp頁面如下：

<%pagecontentType="text/html;charset=GBK"%>

<%pageimport="org.jfree.chart.*,

org.jfree.chart.servlet.ServletUtilities,

org.jfree.util.Rotation,

org.jfree.data.general.DefaultPieDataset,

org.jfree.chart.plot.PiePlot3D"%>

<%

//設置數(shù)據(jù)集

DefaultPieDatasetdataset=newDefaultPieDataset<>;

dataset.setValue<"初中高級程序員",0.55>;

dataset.setValue<"項目經(jīng)理",0.1>;

dataset.setValue<"系統(tǒng)分析師",0.1>;

dataset.setValue<"軟件架構師",0.1>;

dataset.setValue<"其他",0.2>;

//通過工廠類生成JFreeChart對象

JFreeChartchart=ChartFactory.createPieChart3D<"IT行業(yè)職業(yè)分布圖",dataset,true,true,false>;

//獲得3D的水晶餅圖對象

PiePlot3Dpieplot3d=<PiePlot3D>chart.getPlot<>;

//設置開始角度

pieplot3d.setStartAngle<150D>;

//設置方向為"順時針方向"

pieplot3d.setDirection<Rotation.CLOCKWISE>;

//設置透明度,0.5F為半透明,1為不透明,0為全透明

pieplot3d.setForegroundAlpha<0.5F>;

pieplot3d.setNoDataMessage<"無數(shù)據(jù)顯示">;

Stringfilename=ServletUtilities.saveChartAsPNG<chart,500,300,null,session>;

StringgraphURL=request.getContextPath<>+"/DisplayChart?filename="+filename;

%>

<imgsrc="<%=graphURL%>"width=500height=300border=0usemap="#<%=filename%>">

利用setForegroundAlpha<>方法可以設置3D餅圖的透明度,利用setStartAngle<>可以設置其開始角度,利用setDirection<>方法可以設置其方向。該例的運行效果如下圖所示：

四．曲線圖

接著我們來介紹曲線圖的使用。在筆者日常的開發(fā)工作中,曲線圖用得最多,它可以用來繪制趨勢圖、統(tǒng)計分析等。首先我們在WebRoot下建立一個line目錄,用來存放曲線圖實例的jsp頁面。我們在該目錄下建立sample1.jsp頁面來做一個簡單的曲線圖的例子。在開始編碼前,讓我們來看看與畫曲線圖密切相關的幾個類：

1TimeSeriesCollection

曲線數(shù)據(jù)的集合。

2TimeSeries

曲線信息序列。

3ChartFactory

可以利用該類的createTimeSeriesChart方法來創(chuàng)建曲線的JFreeChart對象。

在下例中,我們顯示阿蜜果的blog在20XX度各月份的訪問量情況,修改后的sample1.jsp的容如下：

<%pagecontentType="text/html;charset=GBK"%>

<%pageimport="org.jfree.chart.ChartFactory,

org.jfree.chart.JFreeChart,

org.jfree.chart.servlet.ServletUtilities,

org.jfree.chart.title.TextTitle,

org.jfree.data.time.TimeSeries,

org.jfree.data.time.Month,

org.jfree.data.time.TimeSeriesCollection,

java.awt.Font"%>

<%

//訪問量統(tǒng)計時間線

TimeSeriestimeSeries=newTimeSeries<"阿蜜果blog訪問量統(tǒng)計",Month.class>;

//時間曲線數(shù)據(jù)集合

TimeSeriesCollectionlineDataset=newTimeSeriesCollection<>;

//構造數(shù)據(jù)集合

timeSeries.add<newMonth<1,2007>,11200>;

timeSeries.add<newMonth<2,2007>,9000>;

timeSeries.add<newMonth<3,2007>,6200>;

timeSeries.add<newMonth<4,2007>,8200>;

timeSeries.add<newMonth<5,2007>,8200>;

timeSeries.add<newMonth<6,2007>,12200>;

timeSeries.add<newMonth<7,2007>,13200>;

timeSeries.add<newMonth<8,2007>,8300>;

timeSeries.add<newMonth<9,2007>,12400>;

timeSeries.add<newMonth<10,2007>,12500>;

timeSeries.add<newMonth<11,2007>,13600>;

timeSeries.add<newMonth<12,2007>,12500>;

lineDataset.addSeries<timeSeries>;

JFreeChartchart=ChartFactory.createTimeSeriesChart<"訪問量統(tǒng)計時間線","month","visitamount",lineDataset,true,true,true>;

//設置子標題

TextTitlesubtitle=newTextTitle<"20XX度",newFont<"黑體",Font.BOLD,12>>;

chart.addSubtitle<subtitle>;

//設置主標題

chart.setTitle<newTextTitle<"阿蜜果blog訪問量統(tǒng)計",newFont<"隸書",Font.ITALIC,15>>>;

chart.setAntiAlias<true>;

Stringfilename=ServletUtilities.saveChartAsPNG<chart,500,300,null,session>;

StringgraphURL=request.getContextPath<>+"/DisplayChart?filename="+filename;

%>

<imgsrc="<%=graphURL%>"width=500height=300border=0usemap="#<%=filename%>">

運行后的曲線效果如下圖所示：

有時我們需要顯示各數(shù)據(jù)點及其數(shù)值,這是我們需要對上例進行一點改動,在JFreeChartchart=ChartFactory.createTimeSeriesChart……后,TextTitlesubtitle=newTextTitle……前加上如下的代碼：

XYPlotplot=<XYPlot>chart.getPlot<>;

XYLineAndShapeRendererxylineandshaperenderer=<XYLineAndShapeRenderer>plot.getRenderer<>;

//設置網(wǎng)格背景顏色

plot.setBackgroundPaint<Color.white>;

//設置網(wǎng)格豎線顏色

plot.setDomainGridlinePaint<Color.pink>;

//設置網(wǎng)格橫線顏色

plot.setRangeGridlinePaint<Color.pink>;

//設置曲線圖與xy軸的距離

plot.setAxisOffset<newRectangleInsets<0D,0D,0D,10D>>;

//設置曲線是否顯示數(shù)據(jù)點

xylineandshaperenderer.setBaseShapesVisible<true>;

//設置曲線顯示各數(shù)據(jù)點的值

XYItemRendererxyitem=plot.getRenderer<>;

xyitem.setBaseItemLabelsVisible<true>;

xyitem.setBasePositiveItemLabelPosition<newItemLabelPosition<ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_LEFT>>;

xyitem.setBaseItemLabelGenerator<newStandardXYItemLabelGenerator<>>;

xyitem.setBaseItemLabelFont<newFont<"Dialog",1,14>>;

plot.setRenderer<xyitem>;

并引入了一些另外的包,引入包的語句變成：

<%pageimport="org.jfree.chart.ChartFactory,

org.jfree.chart.title.TextTitle,

org.jfree.data.time.TimeSeries,

org.jfree.data.time.Month,

org.jfree.data.time.TimeSeriesCollection,

org.jfree.chart.plot.XYPlot,

org.jfree.chart.renderer.xy.XYLineAndShap