简单的JFreeChartDEMO

  这里就JFreeChart写一个小小的饼图DEMO，其中的数据是从数据库中取出来的，所有代码有些比较。。。大家需要的改改就可以了。首先写饼图之前要先引入二个Jar文件：jfreechart-1.0.10.jar和jcommon-1.0.13.jar

Code如下：

<% @ page language = " java "  import = " java.util.* "  pageEncoding = " gbk " %>
<% @ page import = " org.jfree.data.general.DefaultPieDataset " %>
<% @ page import = " org.jfree.chart.* " %>
<% @ page import = " org.jfree.chart.plot.* " %>
<% @ page import = " org.jfree.chart.servlet.ServletUtilities " %>
<% @ page import = " org.jfree.chart.labels.StandardPieToolTipGenerator " %>
<% @ page import = " org.jfree.chart.urls.StandardPieURLGenerator " %>
<% @ page import = " org.jfree.chart.entity.StandardEntityCollection " %>
<% @ page import = " java.io.* " %>
<% @ page import = " com.csthit.store.dao.* "   %>
<% @ page import = " com.csthit.store.vo.* "   %>

< html >
   < head >
   <%
      TypeDAO typedao = new  TypeDAO();
    SalesDAO sales = null ;
    FatherType father = null ;
    List list = null ;
    list = typedao.getFatherType();
      
   %>
   < title > 销售图 </ title >
     <%
    DefaultPieDataset data  =   new  DefaultPieDataset(); 
     // 数据动态初始化
     for ( int  i = 0 ;i < list.size();i ++ ) {
        sales = new  SalesDAO();
        father = (FatherType)list.get(i);
        data.setValue(father.getType(),sales.queryQuantityByType(father.getType()));  // 设值
        
    }
  
 
    PiePlot3D plot  =   new  PiePlot3D(data); // 生成一个3D饼图 
    JFreeChart chart  =   new  JFreeChart( "" ,JFreeChart.DEFAULT_TITLE_FONT, plot,  true ); 
    chart.setBackgroundPaint(java.awt.Color.lightGray); // 可选，设置图片背景色 
    chart.setTitle( " 图书销量统计图 " ); // 可选，设置图片标题 
    plot.setToolTipGenerator( new  StandardPieToolTipGenerator()); 
    StandardEntityCollection sec  =   new  StandardEntityCollection(); 
    ChartRenderingInfo info  =   new  ChartRenderingInfo(sec); 
    PrintWriter w  =   new  PrintWriter(out); // 输出MAP信息 
     // 500是图片长度，300是图片高度
     String  filename  =  ServletUtilities.saveChartAsJPEG(chart, 500 , 300 ,info,session); 
    ChartUtilities.writeImageMap(w, " map0 " ,info, false ); 
     String  graphURL  =  request.getContextPath()  +   " /servlet/DisplayChart?filename= "   +  filename;
     %>
   </ head >
  
   < body >
      < center >
    < img  src ="<%= graphURL %>"  width =500  height =300  border =0  usemap ="#map0" >
</ center >  
   </ body >
</ html >

XML配置如下：

   < 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 >

效果显示如下：


各位晚安～