用jfreechart在JSP页面显示点状分布图+分割线(转载:http://blog.csdn.net/ami121/article/details/2450945)
简介:
JSP页面 <%@ page language="java" pageEncoding="gbk"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort
JSP页面
<%
@ page language
=
"
java
"
pageEncoding
=
"
gbk
"
%>
<%
String path
=
request.getContextPath();
String basePath
=
request.getScheme()
+
"
://
"
+
request.getServerName()
+
"
:
"
+
request.getServerPort()
+
path
+
"
/
"
;
%>

<!
DOCTYPE HTML PUBLIC
"
-//W3C//DTD HTML 4.01 Transitional//EN
"
>
<
html
>
<
head
>
<
base href
=
"
<%=basePath%>
"
>
<
title
>
My JSP
'
index.jsp
'
starting page
</
title
>
<
jsp:useBean id
=
"
barchart01
"
scope
=
"
session
"
class
=
"
com.ami.chart.SeriesXY
"
/>
</
head
>
<
body
>
<%
String fileName
=
barchart01.getImg(request.getSession(), out);
String graphURL
=
request.getContextPath()
+
"
/servlet/DisplayChart?filename=
"
+
fileName;
%>
<
br
/>
<
img src
=
"
<%= graphURL %>
"
border
=
"
0
"
usemap
=
"
#<%=fileName %>
"
/>
<
br
/>
</
body
>
</
html
>
WEB.XML
<
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
>/
servlet
/
DisplayChart
</
url
-
pattern
>
</
servlet
-
mapping
>
Java实现代码
package
com.ami.chart;

import
java.awt.BasicStroke;
import
java.awt.Color;
import
java.awt.Font;
import
java.io.PrintWriter;

import
javax.servlet.http.HttpSession;
import
javax.servlet.jsp.JspWriter;

import
org.jfree.chart.ChartFactory;
import
org.jfree.chart.ChartRenderingInfo;
import
org.jfree.chart.ChartUtilities;
import
org.jfree.chart.JFreeChart;
import
org.jfree.chart.axis.NumberAxis;
import
org.jfree.chart.axis.NumberTickUnit;
import
org.jfree.chart.axis.ValueAxis;
import
org.jfree.chart.entity.StandardEntityCollection;
import
org.jfree.chart.plot.PlotOrientation;
import
org.jfree.chart.plot.ValueMarker;
import
org.jfree.chart.plot.XYPlot;
import
org.jfree.chart.renderer.xy.XYItemRenderer;
import
org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import
org.jfree.chart.servlet.ServletUtilities;
import
org.jfree.data.xy.XYSeries;
import
org.jfree.data.xy.XYSeriesCollection;
import
org.jfree.ui.RectangleAnchor;
import
org.jfree.ui.TextAnchor;

public
class
SeriesXY
{
public String getImg(HttpSession session ,JspWriter out){
String filename=null;
double []xydata1_0={12.8d,12.3d,12.9d,12.2d,13.3d,12.0d,12.8d,13.3d,12.9d,13.9d,12.3d,12.0d,12.8d,12.3d,11.9d,13.2d,12.3d,14.0d,12.8d,12.3d,12.9d,13.2d,13.3d,14.0d,12.8d,13.3d,11.9d,13.9d,12.3d,12.0d,19.8d,12.3d,14.9d,18.2d,12.3d,14.0d,12.8d,12.3d,12.9d,18.2d,13.3d,14.0d,12.8d,14.3d,12.9d,13.9d,12.3d,12.0d,13.8d,12.3d,11.9d,13.2d,12.3d,14.0d,12.8d,12.3d,12.9d,18.2d,16.3d,18.0d,12.8d,12.3d,19.9d,13.9d,12.3d,12.0d,12.8d,12.3d,12.9d,13.2d,12.3d,14.0d,12.8d,12.3d,12.9d,12.2d,13.3d,12.0d,12.8d,13.3d,12.9d,13.9d};
double []xydata1_1={196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d};
XYSeriesCollection xyCollection=new XYSeriesCollection();
XYSeries xyseries1=new XYSeries("ACompany");
for(int i=0;i<82;i++){
xyseries1.add(xydata1_0[i], xydata1_1[i]);
}
XYSeries xyseries2=new XYSeries("BCompany");
xyCollection.addSeries(xyseries1);
//分布点状图
JFreeChart chart=ChartFactory.createScatterPlot("电压电流图", "电流","电压", xyCollection, PlotOrientation.VERTICAL, true, false, false);
XYPlot plot=(XYPlot) chart.getPlot();
ValueMarker vmarker=new ValueMarker(230d);//设置分割线
vmarker.setLabel("平均电压230V");
vmarker.setLabelPaint(Color.black);
vmarker.setPaint(Color.red);
vmarker.setLabelFont(new Font("隶书",Font.PLAIN,10));
vmarker.setLabelAnchor(RectangleAnchor.BOTTOM_RIGHT);
vmarker.setLabelTextAnchor(TextAnchor.TOP_RIGHT);
plot.addRangeMarker(vmarker);
ValueMarker xMarker=new ValueMarker(12.50d);
xMarker.setLabel("平均电流12.50A");
xMarker.setPaint(Color.orange);
xMarker.setLabelFont(new Font("隶书",Font.BOLD,10));
xMarker.setLabelAnchor(RectangleAnchor.BOTTOM_RIGHT);
xMarker.setLabelTextAnchor(TextAnchor.BOTTOM_RIGHT);
plot.addDomainMarker(xMarker);
plot.setRangeGridlinePaint(Color.black);//设置X轴的颜色
ValueAxis yAxis=plot.getRangeAxis();
yAxis.setAutoRange(true);
yAxis.setAutoRangeMinimumSize(50.0d);
NumberAxis yNumber=(NumberAxis) plot.getRangeAxis();
yNumber.setTickUnit(new NumberTickUnit(50d));
yAxis.setLowerBound(50.0d);
plot.setRangeAxis(yAxis);
ValueAxis xAxis=plot.getDomainAxis();
xAxis.setAutoRange(false);
NumberAxis numberaxis=(NumberAxis)plot.getDomainAxis();
numberaxis.setTickUnit(new NumberTickUnit(0.1D));//设置X轴跨度每次增加1
xAxis.setUpperBound(14.2d);
xAxis.setLowerBound(11.8d);
XYItemRenderer itRender=plot.getRenderer();
try {
PrintWriter pw=new PrintWriter(out);
StandardEntityCollection sec = new StandardEntityCollection();
ChartRenderingInfo info = new ChartRenderingInfo(sec);

filename=ServletUtilities.saveChartAsJPEG(chart,650, 400,null, session);
ChartUtilities.writeImageMap(pw, filename,info, true);
} catch (Exception e) {
e.printStackTrace();
}
return filename;
}
}
效果图
