[导入]柱状图

[导入]柱状图

柱状图的一个演示(不带热点提示的) index.jsp 往 barview.jsp 提交 index.jsp code:

<%@

page

 

language="java" pageEncoding="ISO-8859-1"%>

<

 

html>

<

 

head>

 

<title></title>

</

 

head>

<

 

body>

 

<form action="barview.jsp">

 

<input type="text" name="category">

 

<br>

 

<input type="submit" value="submit" />

 

<input type="reset" value="reset" />

 

</form>

</

 

body>

</

html>

 

html>

html>

 

 

 

barview.jsp code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<%@

 

 

page language = "java" contentType =

"text/html; charset=UTF-8"

 

 

 

pageEncoding = "UTF-8"

%>

<%@

 

 

page

 

 

 

import = "org.jfree.chart.ChartFactory,org.jfree.chart.JFreeChart,org.jfree.chart.plot.PlotOrientation,org.jfree.chart.servlet.ServletUtilities,org.jfree.data.category.*"

%>

<

 

 

html

>

 

 

< head

>

 

 

< title > jfreechart </ TITLE

>

 

 

</ HEAD

>

 

 

< body

>

 

 

<%

CategoryDataset dataset;

String category = request.getParameter(

 

"category"

);

category =

 

new String(category.getBytes( "ISO8859_1" ), "GBK"

);

 

 

if (category.equals( "本科" ) || category.equals( "高中"

)

|| category.equals(

 

"大专"

)) {

dataset = getDataSet();

}

 

else if (category.equals( "硕士" ) || category.equals( "博士"

)) {

dataset = getDataSet2();

}

 

else

{

dataset = getDataSet3();

}

String title = category +

 

"程序员在各城市薪金情况统计"

;

JFreeChart chart = ChartFactory.createBarChart3D(title,

 

"城市" , "薪金"

,

dataset, PlotOrientation.VERTICAL,

 

true , false , false

);

String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,

 

 

null

, session);

String graphURL = request.getContextPath()

+

 

"/servlet/DisplayChart?filename="

+ filename;

 

 

%>

 

 

< p ALIGN = "CENTER"

>

 

 

< img src =" <%= graphURL %> " width = 500 height = 300 border =

0

 

 

 

usemap =" <%= filename %> "

>

 

 

</ p

>

 

 

<%! private static

CategoryDataset getDataSet() {

DefaultCategoryDataset dataset =

 

new

DefaultCategoryDataset();

dataset.addValue(2000,

 

"北京" , "VB"

);

dataset.addValue(1800,

 

"上海" , "VB"

);

dataset.addValue(2200,

 

"广州" , "VB"

);

dataset.addValue(3200,

 

"北京" , "JAVA"

);

dataset.addValue(3500,

 

"上海" , "JAVA"

);

dataset.addValue(3600,

 

"广州" , "JAVA"

);

dataset.addValue(3300,

 

"北京" , "DOT NET"

);

dataset.addValue(3400,

 

"上海" , "DOT NET"

);

dataset.addValue(3700,

 

"广州" , "DOT NET"

);

dataset.addValue(2500,

 

"北京" , "DELPHI"

);

dataset.addValue(2800,

 

"上海" , "DELPHI"

);

dataset.addValue(3200,

 

"广州" , "DELPHI"

);

dataset.addValue(5000,

 

"北京" , "VC"

);

dataset.addValue(3500,

 

"上海" , "VC"

);

dataset.addValue(4600,

 

"广州" , "VC"

);

 

 

return

dataset;

}

 

 

 

private static

CategoryDataset getDataSet2() {

DefaultCategoryDataset dataset =

 

new

DefaultCategoryDataset();

dataset.addValue(2000,

 

"上海" , "VB"

);

dataset.addValue(3000,

 

"北京" , "JAVA"

);

dataset.addValue(3330,

 

"上海" , "JAVA"

);

dataset.addValue(3500,

 

"广州" , "JAVA"

);

dataset.addValue(3500,

 

"北京" , "DOT NET"

);

dataset.addValue(4000,

 

"上海" , "DOT NET"

);

dataset.addValue(4800,

 

"广州" , "DOT NET"

);

dataset.addValue(2600,

 

"北京" , "DELPHI"

);

dataset.addValue(2200,

 

"上海" , "DELPHI"

);

dataset.addValue(4000,

 

"北京" , "VC"

);

dataset.addValue(4000,

 

"上海" , "VC"

);

dataset.addValue(4200,

 

"广州" , "VC"

);

 

 

return

dataset;

}

 

 

 

private static

CategoryDataset getDataSet3() {

DefaultCategoryDataset dataset =

 

new

DefaultCategoryDataset();

dataset.addValue(2100,

 

"北京" , "VB"

);

dataset.addValue(2200,

 

"上海" , "VB"

);

dataset.addValue(2100,

 

"广州" , "VB"

);

dataset.addValue(3000,

 

"北京" , "JAVA"

);

dataset.addValue(3200,

 

"上海" , "JAVA"

);

dataset.addValue(3600,

 

"广州" , "JAVA"

);

dataset.addValue(4100,

 

"北京" , "DOT NET"

);

dataset.addValue(4200,

 

"上海" , "DOT NET"

);

dataset.addValue(4160,

 

"广州" , "DOT NET"

);

dataset.addValue(2400,

 

"北京" , "DELPHI"

);

dataset.addValue(2600,

 

"上海" , "DELPHI"

);

dataset.addValue(2500,

 

"广州" , "DELPHI"

);

dataset.addValue(5400,

 

"北京" , "VC"

);

dataset.addValue(5000,

 

"上海" , "VC"

);

dataset.addValue(5500,

 

"广州" , "VC"

);

 

 

return

dataset;

}

 

%>

 

 

</ body

>

</

 

 

html

>

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文章来源: http://java-jun.javaeye.com/blog/602594