实现方式：jsp+javabean
版本 ：jfreechart-1.0.8
web-inf：设置
=====================================
<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>
======================================
jsp文件：
=========================================================================
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>Insert title here</title>
<script language="javascript">
function overlib(s){
document.all.ChartTip.style.display="block";
top.document.getElementById('ChartTip').innerHTML=s;
document.all.ChartTip.style.left=document.body.scrollLeft+event.x;
document.all.ChartTip.style.top=document.body.scrollTop+event.y-20;
}
function nd(s){
document.all.ChartTip.style.display="none";
}
</script>
<jsp:useBean id="barchart01" scope="session"
class="com.mdcl.fso.homepage.chart.BarChart01" />
</head>
<body>
<%
String fileName = barchart01.drawPic(request.getSession(), out);
String graphURL = request.getContextPath()
+ "/servlet/DisplayChart?filename=" + fileName;
%>
<br />
<img src="<%= graphURL %>" border="0" usemap="#<%=fileName %>" />
<br />
<div id="ChartTip"
style="position:absolute; font-family:'宋体'; font-size: 12px;line-height: 20px;background-color:#FFFFEC; border: 1px solid #999999;display:none;left:0px;top:1px;">测试显示</div>
</body>
</html>
=========================================================================
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;
}
}
