JFreeChat四种图表的绘制例程

1.平面饼图

Servlet代码:

package com.sitinspring.action;

import java.awt.Color;

import java.awt.Font;

import java.util.Hashtable;

import java.util.Map;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.servlet.ServletUtilities;

import org.jfree.chart.title.TextTitle;

import org.jfree.data.general.DefaultKeyedValuesDataset;

/**

* 用于创建饼图的Servlet

* @author sitinspring

* @date 2008-2-12

public class PieChartServlet extends HttpServlet {

private static final long serialVersionUID = 56890894234786L;

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

request.setCharacterEncoding("UTF-8");

Map<String,Integer> ht=new Hashtable<String,Integer>();

ht.put("美国", 139800);

ht.put("日本", 52900);

ht.put("德国", 32800);

ht.put("中国", 30100);

ht.put("英国", 25700);

ht.put("法国", 25200);

ht.put("意大利", 20900);

ht.put("西班牙", 14100);

ht.put("加拿大", 13600);

ht.put("俄罗斯", 11400);

float sum=0;

for(Integer i:ht.values()){

sum+=i;

}

// 设定数据源

DefaultKeyedValuesDataset piedata = new DefaultKeyedValuesDataset();

// 向数据源中插值，第一个参数为名称，第二个参数是double数

for(String nation:ht.keySet()){

piedata.setValue(nation, ((float)ht.get(nation))/sum*100);

}

// 使用ChartFactory来创建JFreeChart

JFreeChart chart = ChartFactory.createPieChart("2007世界总GDP排名", piedata, true,

true, true);

// 设定图片标题

chart.setTitle(new TextTitle("2007世界总GDP排名", new Font("隶书", Font.ITALIC, 15)));

// 设定背景

chart.setBackgroundPaint(Color.white);

// 创建文件并将图片地址传递到页面

String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,

null, request.getSession());

String graphURL = request.getContextPath()

+ "/displayChart?filename=" + filename;

request.setAttribute("graphURL", graphURL);

// 标识

request.setAttribute("msg", "饼图效果");

// 页面转向

RequestDispatcher dispatcher = request

.getRequestDispatcher("/web/page/chart.jsp");

dispatcher.forward(request, response);

return;

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

doPost(request, response);

}

页面代码:

<%@ page contentType="text/html; charset=UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

<head>

<title>JFreeChart图表效果</title>

type="text/css" />

</head>

<body>

<jsp:include page="/web/page/branch/header.jsp"/>

</div>

<jsp:include page="/web/page/branch/sidebar.jsp"/>

</div>

out.print("<tr>");

String graphURL=(String)request.getAttribute("graphURL");

out.print("<td colspan=4 align=\"center\"><img src=\""+graphURL+"\"/></td>");

out.print("</tr>");

</table>

</div>

<jsp:include page="/web/page/branch/footer.jsp"/>

</div>

</body>

</html>

2.3d饼图

Servlet代码:

package com.sitinspring.action;

import java.awt.Color;

import java.awt.Font;

import java.util.Hashtable;

import java.util.Map;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.servlet.ServletUtilities;

import org.jfree.chart.title.TextTitle;

import org.jfree.data.general.DefaultKeyedValuesDataset;

/**

* 用于创建3D饼图的Servlet

* @author sitinspring

* @date 2008-2-12

public class Pie3DChartServlet extends HttpServlet {

private static final long serialVersionUID = 56890894234786L;

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

request.setCharacterEncoding("UTF-8");

Map<String,Integer> ht=new Hashtable<String,Integer>();

ht.put("美国", 139800);

ht.put("日本", 52900);

ht.put("德国", 32800);

ht.put("中国", 30100);

ht.put("英国", 25700);

ht.put("法国", 25200);

ht.put("意大利", 20900);

ht.put("西班牙", 14100);

ht.put("加拿大", 13600);

ht.put("俄罗斯", 11400);

float sum=0;

for(Integer i:ht.values()){

sum+=i;

}

// 设定数据源

DefaultKeyedValuesDataset piedata = new DefaultKeyedValuesDataset();

// 向数据源中插值，第一个参数为名称，第二个参数是double数

for(String nation:ht.keySet()){

piedata.setValue(nation, ((float)ht.get(nation))/sum*100);

}

// 使用ChartFactory来创建JFreeChart

JFreeChart chart = ChartFactory.createPieChart3D("2007世界总GDP排名", piedata, true,

true, true);

// 设定图片标题

chart.setTitle(new TextTitle("2007世界总GDP排名", new Font("隶书", Font.ITALIC, 15)));

// 设定背景

chart.setBackgroundPaint(Color.white);

// 创建文件并将图片地址传递到页面

String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,

null, request.getSession());

String graphURL = request.getContextPath()

+ "/displayChart?filename=" + filename;

request.setAttribute("graphURL", graphURL);

// 标识

request.setAttribute("msg", "3D饼图效果");

// 页面转向

RequestDispatcher dispatcher = request

.getRequestDispatcher("/web/page/chart.jsp");

dispatcher.forward(request, response);

return;

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

doPost(request, response);

}

3.折线图

Servlet代码:

package com.sitinspring.action;

import java.util.LinkedHashMap;

import java.util.Map;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.servlet.ServletUtilities;

import org.jfree.data.time.Day;

import org.jfree.data.time.TimeSeries;

import org.jfree.data.time.TimeSeriesCollection;

import org.jfree.data.time.TimeSeriesDataItem;

/**

* 用于创建折线图的Servlet

* @author sitinspring

* @date 2008-2-12

public class CurveChartServlet extends HttpServlet {

private static final long serialVersionUID = 56890894234786L;

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

request.setCharacterEncoding("UTF-8");

// 曲线图标题

String title = "趋势分析";

// 曲线图X轴提示

String domain = "年份";

// 曲线图Y轴提示

String range = "GDP";

// 创建时间数据源，每一个TimeSeries在图上是一条曲线

TimeSeries chinaTs = new TimeSeries("中国");

Map<Integer, Integer> chinaht = new LinkedHashMap<Integer, Integer>();

chinaht.put(2002, 22100);

chinaht.put(2003, 14100);

chinaht.put(2004, 27100);

chinaht.put(2005, 38100);

chinaht.put(2006, 29000);

chinaht.put(2007, 90100);

for (Integer i:chinaht.keySet()) {

chinaTs.add(new TimeSeriesDataItem(new Day(1, 1, i),new Double(chinaht.get(i))));

}

// 创建时间数据源，每一个TimeSeries在图上是一条曲线

TimeSeries japanTs = new TimeSeries("日本");

Map<Integer, Integer> japanht = new LinkedHashMap<Integer, Integer>();

japanht.put(2000, 43900);

japanht.put(2003, 63500);

japanht.put(2004, 43400);

japanht.put(2005, 63200);

japanht.put(2006, 53100);

japanht.put(2007, 32900);

for (Integer i:japanht.keySet()) {

japanTs.add(new TimeSeriesDataItem(new Day(1, 1, i),new Double(japanht.get(i))));

}

// 创建时间数据源，每一个TimeSeries在图上是一条曲线

TimeSeries usaTs = new TimeSeries("美国");

Map<Integer, Integer> usaht = new LinkedHashMap<Integer, Integer>();

usaht.put(2001, 100000);

usaht.put(2003, 159800);

usaht.put(2004, 109700);

usaht.put(2005, 129600);

usaht.put(2006, 9800);

usaht.put(2007, 149800);

for (Integer i:usaht.keySet()) {

usaTs.add(new TimeSeriesDataItem(new Day(1, 1, i),new Double(usaht.get(i))));

}

// 时间曲线数据集合

TimeSeriesCollection dataset = new TimeSeriesCollection();

dataset.addSeries(chinaTs);

dataset.addSeries(japanTs);

dataset.addSeries(usaTs);

// 时间曲线元素

JFreeChart chart = ChartFactory.createTimeSeriesChart(title, domain,

range, dataset, true, true, false);

// 创建文件并将图片地址传递到页面

String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,

null, request.getSession());

String graphURL = request.getContextPath() + "/displayChart?filename="

+ filename;

request.setAttribute("graphURL", graphURL);

// 标识

request.setAttribute("msg", "折线图效果");

// 页面转向

RequestDispatcher dispatcher = request

.getRequestDispatcher("/web/page/chart.jsp");

dispatcher.forward(request, response);

return;

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

doPost(request, response);

}

4.柱图

Servlet代码:

package com.sitinspring.action;

import java.awt.Color;

import java.awt.Font;

import java.util.Hashtable;

import java.util.Map;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.chart.servlet.ServletUtilities;

import org.jfree.chart.title.TextTitle;

import org.jfree.data.category.DefaultCategoryDataset;

/**

* 用于创建柱图的Servlet

* @author sitinspring

* @date 2008-2-12

public class ColumnChartServlet extends HttpServlet {

private static final long serialVersionUID = 56890894234786L;

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException {

request.setCharacterEncoding("UTF-8");

Map<String,Integer> ht=new Hashtable<String,Integer>();

ht.put("美国", 139800);

ht.put("日本", 52900);

ht.put("德国", 32800);

ht.put("中国", 30100);

ht.put("英国", 25700);

ht.put("法国", 25200);

ht.put("意大利", 20900);

ht.put("西班牙", 14100);

ht.put("加拿大", 13600);

ht.put("俄罗斯", 11400);

float sum=0;

for(Integer i:ht.values())