请教jfreechart的两个问题(饼,柱)

csdn--> search jfreechart
这些日子有不少例子,出来就问,不如搜搜好.

http://www.ibm.com/developerworks/cn/java/l-jfreechart/
或许这里的资料能帮助到你。

csdn下载区有柱图带数字的，我下载过使用。

我只用jfreechart画过柱状图，
给出如下代码：
<%@page pageEncoding="gbk"%> <%@page import=" java.io.FileNotFoundException " %>
<%@page import=" java.io.FileOutputStream " %>
<%@page import=" org.apache.commons.logging.Log " %>
<%@page import=" java.io.IOException,edu.jmi.dao.*,java.util.*" %>
<%@page import=" org.jfree.chart.servlet.ServletUtilities" %> <%@page import=" org.apache.commons.logging.LogFactory " %>
<%@page import=" org.jfree.chart.ChartFactory " %>
<%@page import=" org.jfree.chart.ChartUtilities " %>
<%@page import=" org.jfree.chart.JFreeChart " %>
<%@page import=" org.jfree.chart.plot.PlotOrientation " %>
<%@page import=" org.jfree.data.category.CategoryDataset " %>
<%@page import=" org.jfree.data.category.DefaultCategoryDataset " %> <%@page import = " java.awt.Color " %>
<%@page import = " org.jfree.chart.renderer.category.BarRenderer3D " %>
<%@page import = " org.jfree.chart.labels.StandardCategoryItemLabelGenerator " %>
<%@page import = " org.jfree.chart.axis.* " %>
<%@page import = " org.jfree.chart.plot.CategoryPlot " %> <%
  ProjectDao pd=new ProjectDao();
List list=pd.statyear();
request.setAttribute("list",list);
List list2=new ArrayList();
int count=0;int count1=0;
  DefaultCategoryDataset dataset  =  new  DefaultCategoryDataset();
  for(int i=0;i<list.size();i++)
  {
    list2=pd.resultOfYear(Integer.parseInt(list.get(i).toString()));
    count=0;count1=0;
    for(int j=0;j<list2.size();j++)
    {
     if(j==0)
     {
      count=count+Integer.parseInt(list2.get(j).toString());
     }
     if(j==1||j==3)
     {
       count1=count1+Integer.parseInt(list2.get(j).toString());
     }
     if(j==0&&count!=0||(j==3&&count1!=0))
     {
      dataset.addValue( count ,  "申请课题数" ,  list.get(i).toString() );
      dataset.addValue( count1 ,  "通过" ,  list.get(i).toString() );
     }
    }
  }
  dataset.addValue(0 ,  "申请课题数" ,  "其他");
  dataset.addValue(0,  "通过" ,"其他");
       JFreeChart chart=ChartFactory.createBarChart3D( " 年度课题统计" , "  " , " 数量 " ,dataset,PlotOrientation.VERTICAL, true , false , false );
        chart.setBackgroundPaint(Color.LIGHT_GRAY);
        CategoryPlot plot  =  chart.getCategoryPlot();        CategoryAxis domainAxis  =  plot.getDomainAxis();
         // domainAxis.setVerticalCategoryLabels( false );
        plot.setDomainAxis(domainAxis);
//获取纵坐标
  CategoryPlot categoryPlot=chart.getCategoryPlot();
       NumberAxis numberaxis = (NumberAxis)categoryPlot.getRangeAxis();
       //将纵坐标间距设置为50
       numberaxis.setTickUnit(new NumberTickUnit(5));//设置纵坐标增长的幅度
       numberaxis.setAutoRange(false);//设置是否自动限制最大范围
       numberaxis.setRange(0,50);//设置纵坐标最小，最大显示数据
       BarRenderer3D renderer=new  BarRenderer3D();
       renderer.setBaseOutlinePaint(Color.BLACK);
         // 设置每个地区所包含的平行柱的之间距离
        renderer.setItemMargin(0.1);
         // 显示每个柱的数值，并修改该数值的字体属性
        renderer.setItemLabelGenerator( new  StandardCategoryItemLabelGenerator());
        renderer.setItemLabelsVisible( true );
        renderer.setMaximumBarWidth(0.06D);
        plot.setRenderer(renderer);         //  设置柱的透明度
        plot.setForegroundAlpha(0.8f);   //ChartUtilities.writeChartAsJPEG(response.getOutputStream(),chart, 640 , 400 );
   String filename = ServletUtilities.saveChartAsJPEG(chart, 650, 350, null, session); //设置生成图片的宽高，这里的宽高一定要最好与下面的图片的宽高一致，这样才能保证图片清晰
  String graphURL =request.getContextPath()+"/servlet/DisplayChart?filename="+filename;
%>
<body bgcolor="#E4E8Ef">
<center><img src="<%=graphURL %>" width=650 height=350 border=0 usemap="#<%=filename%>"><br> <br> <br> <br>
<input type="button" value="点击查看详情" onclick="window.open('allYear.jsp','_self')">
</center>
</body>

调试易

请教jfreechart的两个问题(饼,柱)

解决方案 »