JavaWeb实现图形报表折线图的方法
本文实例讲述了JavaWeb实现图形报表折线图的方法。分享给大家供大家参考，具体如下：
步骤说明:
1.导入log4j.jar,jfreechart-0.9.18.jar,jdom.jar,jcommon-0.9.3.jar四个jar包
2.在某个包中写入Tuxin.Java类
packagecom.mengya.util;
importjava.awt.Color;
importjava.awt.Font;
importjava.io.PrintWriter;
importjavax.servlet.http.HttpSession;
importorg.jfree.chart.ChartFactory;
importorg.jfree.chart.ChartRenderingInfo;
importorg.jfree.chart.ChartUtilities;
importorg.jfree.chart.JFreeChart;
importorg.jfree.chart.StandardLegend;
importorg.jfree.chart.axis.NumberAxis;
importorg.jfree.chart.entity.StandardEntityCollection;
importorg.jfree.chart.plot.CategoryPlot;
importorg.jfree.chart.plot.PlotOrientation;
importorg.jfree.chart.renderer.LineAndShapeRenderer;
importorg.jfree.chart.servlet.ServletUtilities;
importorg.jfree.data.DefaultCategoryDataset;
publicclassLine
{
privateDefaultCategoryDatasetdataset=newDefaultCategoryDataset();
publicvoidsetValue(intsum,Stringline,Stringwfield)
{
dataset.addValue(sum,line,wfield);
}
publicStringgenerateLineChart(Stringtitle,Stringwfield,Stringhfield,HttpSessionsession,PrintWriterpw,intwPhoto,inthPhoto)
{
Stringfilename=null;
try
{
finalJFreeChartchart=ChartFactory.createLineChart
(
title,//图表标题
wfield,//横轴的显示标签
hfield,//纵轴的显示标签
dataset,//数据集
PlotOrientation.VERTICAL,//图表方向：水平、垂直
true,//是否显示图例
true,//是否生成提示工具tooltips
false//是否生成URL链接
);
StandardLegendlegend=(StandardLegend)chart.getLegend();//生成图例
legend.setDisplaySeriesShapes(true);//显示图例形状
legend.setShapeScaleX(1.5);//设置图例X轴的大小
legend.setShapeScaleY(1.5);//设置图例Y轴的大小
legend.setDisplaySeriesLines(true);//显示图示项的横线
//设置图片的背景色
chart.setBackgroundPaint(newjava.awt.Color(189,235,255));
CategoryPlotplot=(CategoryPlot)chart.getPlot();
plot.setBackgroundPaint(newColor(239,251,255));//生成图片中墙体的背景色
plot.setRangeGridlinePaint(Color.black);//生成图片中格子线的颜色
//没有数据时显示的消息
plot.setNoDataMessage("没有相关统计数据");
plot.setNoDataMessageFont(newFont("黑体",Font.CENTER_BASELINE,16));
plot.setNoDataMessagePaint(Color.RED);
NumberAxisrangeAxis=(NumberAxis)plot.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());//设置图中的刻度线的单位
rangeAxis.setAutoRangeIncludesZero(true);//强制在自动选择的数据范围中包含0
LineAndShapeRendererrenderer=(LineAndShapeRenderer)plot.getRenderer();
renderer.setDrawShapes(true);//折线的数据点根据分类使用不同的形状
renderer.setItemLabelsVisible(true);//显示每个点上的数据值的提示工具,数据标签是否可见
ChartRenderingInfoinfo=newChartRenderingInfo(new
StandardEntityCollection());
//500是图片长度，300是图片高度
filename=ServletUtilities.saveChartAsPNG(chart,wPhoto,hPhoto,info,session);
ChartUtilities.writeImageMap(pw,filename,info);
pw.flush();
}
catch(Exceptione)
{
e.printStackTrace();
}
returnfilename;
}
}
3.配置web.xml,在web.xml中添加如下内空:
<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>
4.在要显示图片的jsp中添加内容:
<%@pagelanguage="java"import="java.util.*,com.mengya.util.Line,com.mengya.bean.StuBean"pageEncoding="gbk"%>
<%@pageimport="java.io.PrintWriter;"%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<title>折线图</title>
</head>
<body>
<%
Linett=newLine();
//第一条折线
Listar=(ArrayList)request.getAttribute("arr1");
for(inti=0;i<ar.size();i++){
StuBeanbean=(StuBean)ar.get(i);
tt.setValue((int)bean.getS_money(),"张明学个人消费比例图",bean.getS_month()+"");
}
//条二条折线
ar=(ArrayList)request.getAttribute("arr2");
for(inti=0;i<ar.size();i++){
StuBeanbean=(StuBean)ar.get(i);
tt.setValue((int)bean.getS_money(),"梦娅个人消费比例图",bean.getS_month()+"");
}
//说明:tt.setValue(inta,Stringb,Stringc)
//其中的第二个参数b是该条折线的名字,每条折线的名字最好不要一样.
Stringfilename=tt.generateLineChart("个人消费比例图","月份",
"费用",session,newPrintWriter(out),800,550);
StringgraphURL=request.getContextPath()
+"/DisplayChart?filename="+filename;
%>
<PALIGN="CENTER">
<imgsrc="<%=graphURL%>"width=800height=550border=1usemap="#<%=filename%>">
</body>
</html>
希望本文所述对大家JSP程序设计有所帮助。