有热点的JfreeChart柱型图（原创）[转]

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实现方式：jsp+javabean
版本 ：jfreechart-1.0.8
web-inf：设置
=====================================

  DisplayChart
  
   org.jfree.chart.servlet.DisplayChart
  
 
 
  DisplayChart
  /servlet/DisplayChart
 
======================================
jsp文件：
=========================================================================
<%@ page language="java" contentType="text/html; charset=GBK"
 pageEncoding="GBK"%>










<%
 String fileName = barchart01.drawPic(request.getSession(), out);
 String graphURL = request.getContextPath()
   + "/servlet/DisplayChart?filename=" + fileName;
%>





测试显示


=========================================================================
java文件
=========================================================================
package com.mdcl.fso.homepage.chart;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.urls.StandardCategoryURLGenerator;
import org.jfree.chart.urls.StandardPieURLGenerator;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.labels.*;
import org.jfree.ui.*;
import java.util.*;

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

import com.mdcl.fso.homepage.*;

public class BarChart01 {

 private static DefaultCategoryDataset dataset = new DefaultCategoryDataset();

 private DefaultCategoryDataset getDataset() {// 取数据

  List expense = new ArrayList();
  String sql = "select ftr.organ_id ,fs.dept_name,ftr.subject_id,fft.finance_type_name,ftr.rpt_date ,ftr.rpt_data "
    + "from fso_t_rpt_expense ftr,fso_sdept fs,fso_finance_type fft "
    + "where ftr.type_id='D' "
    + "and ftr.organ_id=fs.dept_id  "
    + "and ftr.rpt_date='2007-08' "
    + "and fft.finance_type_id=ftr.subject_id  "
    + "and ftr.organ_id='1140'";

  expense = DBDao.DbQueryExpense(sql);
  for (int i = 0; i < expense.size(); i++) {
   HashMap param = new HashMap();
   param = (HashMap) expense.get(i);

   double dt = Double.parseDouble(String.valueOf(param.get("rpt_data")));
   String a = (String) param.get("organ");
   String b = (String) param.get("subject");

   dataset.addValue(dt, a, b);
  }

  return dataset;

 }

 public String drawPic(HttpSession session, JspWriter out) {
  String fileName = null;
  JFreeChart chart = ChartFactory.createBarChart3D("2007-08成本统计", "费用类型",
    "金额（单位：元）", getDataset(), PlotOrientation.VERTICAL, true, true,
    true);
  chart.setBackgroundPaint(Color.WHITE);

  CategoryPlot plot = chart.getCategoryPlot();// 获取绘图区

  plot.setBackgroundPaint(new Color(255, 255, 255)); // 设置绘图区背景色

  plot.setRangeGridlinePaint(Color.gray); // 设置水平方向背景线颜色

  plot.setRangeGridlinesVisible(true); // 设置是否显示水平方向背景线,默认值为True

  plot.setDomainGridlinePaint(Color.black); // 设置垂直方向背景线颜色

  // plot.setDomainGridlinesVisible(true); // 设置是否显示垂直方向背景线,默认值为False

  CategoryAxis domainAxis = plot.getDomainAxis();// 获取统计种类轴标题（X轴）

  plot.setDomainAxis(domainAxis);// 添加X轴

  BarRenderer3D renderer = new BarRenderer3D();// 获得BarRenderer3D类的实例，目的是设置柱形的绘制属性

  renderer.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator());//

  renderer.setBaseItemURLGenerator(new StandardCategoryURLGenerator("index2.jsp"));// 生成热点,用于链接

  renderer.setItemMargin(0.1);// 设置每个组所包含的平行柱的之间距离

  renderer.setSeriesPaint(0, Color.GREEN);// 设置柱子的颜色
  renderer.setSeriesPaint(1, Color.blue);// 设置柱子的颜色

  renderer.setBaseOutlinePaint(Color.BLACK);

  renderer.setWallPaint(Color.gray);// 设置 Wall 的颜色

  renderer.setItemLabelAnchorOffset(10D);// 设置柱形图上的文字偏离值

  renderer.setBaseItemLabelFont(new Font("arial", Font.PLAIN, 10), true);// 设置柱形图上的文字

  renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());// //显示每个柱的数值，并修改该数值的字体属性

  renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER));

  renderer.setBaseItemLabelsVisible(true);

  renderer.setMaximumBarWidth(0.050000000000000003D);

  plot.setRenderer(renderer);

  plot.setForegroundAlpha(0.80f);// 设置柱的透明度

  // plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);//设置显示位置

  plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);// 设置显示位置

  try {

   PrintWriter pw = new PrintWriter(out);

   StandardEntityCollection sec = new StandardEntityCollection();
   ChartRenderingInfo info = new ChartRenderingInfo(sec);

   fileName = ServletUtilities.saveChartAsPNG(chart, 640, 400, info,
     session);
   // ChartUtilities.writeChartAsPNG(op,chart, 640, 400, info,true,0);
   ChartUtilities.writeImageMap(pw, fileName, info, true);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  return fileName;

 }

}

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