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
>