package gov.gwssi.tax.nspg.datadisposal; 

import java.awt.insets; 
import java.awt.image; 
import java.io.printwriter; 
import java.text.simpledateformat; 
import java.util.date; 
import java.util.arraylist; 
import java.util.iterator; 
import java.util.locale; 
import java.text.numberformat; 
import javax.servlet.http.httpsession; 
import org.jfree.data.*; 
import org.jfree.chart.*; 
import org.jfree.chart.axis.*; 
import org.jfree.chart.renderer.verticalbarrenderer; 
import org.jfree.chart.renderer.standardxyitemrenderer; 
import org.jfree.chart.plot.*; 
import org.jfree.chart.entity.*; 
import org.jfree.chart.tooltips.*; 
import org.jfree.chart.urls.*; 
import org.jfree.chart.servlet.*; 
import java.awt.font; 

/** 
 * <p>title: </p> 
 * <p>description: </p> 
 * <p>copyright: copyright (c) 2003</p> 
 * <p>company: </p> 
 * @author jagie 
 * @version 1.0 
 */ 

public class gspiechart { 
  public static void main(string[] args) { 
    long[] testdata = { 
        new long(10), new long(20), new long(30), new long(40)}; 
    generatepiechart(testdata, "", null, new printwriter(system.out), 580, 250); 
  } 

  /** 
   * 生成图像文件 
   * @param datas long[]数组 
   * @param targeturl 点饼形图上的扇形，定向到的url 
   * @param session httpsession 
   * @param pw printwriter 
   * @param w 生成的图的宽度 
   * @param h 生成的图的高度 
   * @return 生成的图像文件的路径 
   */ 

  public static string generatepiechart(long[] datas, string targeturl, 
                                        httpsession session, printwriter pw, 
                                        int w, int h) { 
    string filename = null; 
    try { 

      defaultpiedataset data = new defaultpiedataset(); 
      data.setvalue("正常纳税人", datas[0]); 
      data.setvalue("异常纳税人", datas[1]); 
      data.setvalue("数据不全纳税人", datas[2]); 
      data.setvalue("未处理纳税人", datas[3]); 

      //  create the chart object 
      pie3dplot plot = new pie3dplot(data); 
      plot.setinsets(new insets(0, 5, 5, 5)); 
      plot.setforegroundalpha(0.6f); 
      plot.setsectionlabeltype(plot.no_labels); 

      plot.seturlgenerator(new standardpieurlgenerator(targeturl, "type")); 
      plot.settooltipgenerator(new standardpietooltipgenerator()); 
      jfreechart chart = new jfreechart(
"数据处理结果统计图", jfreechart.default_title_font, plot, true); 
      chart.settitle(new texttitle(
"数据处理结果统计图", new font("黑体", font.bold, 15))); 
      standardlegend sl = (standardlegend) chart.getlegend(); 
      sl.setitemfont(new font("黑体", font.truetype_font, 12)); 

      chart.setbackgroundpaint(new java.awt.color(254, 254, 141)); 

      //因为jfreechart把生成的png文件保存在系统的临时文件夹中，你需要在适当的  
      //时候调用session.removeattribute("jfreechart_deleter")，这样可以保证png文 
      //件被删除掉 

      chartrenderinginfo info = new chartrenderinginfo(new 
          standardentitycollection()); 
      filename = servletutilities.savechartaspng(chart, w, h, info, session); 

      //  write the image map to the printwriter 
      chartutilities.writeimagemap(pw, filename, info); 
      pw.flush(); 

    } 
    catch (exception e) { 
      system.out.println("exception - " + e.tostring()); 
      e.printstacktrace(system.out); 
      filename = "public_error_500x300.png"; 
    } 
    return filename; 
  } 
}
.........java代码.................

<% 

//以下部分为图象输出 
string targeturl="../servlet/gov.gwssi.tax.nspg.
controlservlet.gsmaincontrolservlet?id="+sid; 
long[] datas={normals,new long(totalabnormal),
datalacks,notprocesses}; 
string filename=gspiechart.generatepiechart
(datas,targeturl,session,new printwriter(out),580,250); 
string graphurl = request.getcontextpath() + 
"/servlet/displaychart?filename=" + filename; 

%>

<!-- pie chart --> 
<table  width="580" border="0" cellspacing="0" cellpadding="0"> 
  <tr> 
    <td>  
      <ccid_file values="<%=" graphurl % />" width=580 height=250 border=0  
         usemap="#<%=filename %>"> 
    </td> 
  </tr> 
</table>

[pre]<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>[/pre]