jfreechart实例

/*java文件*/
package com.cn;

import java.awt.Color;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.io.*;

import javax.servlet.http.HttpSession;

import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.chart.*;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.*;
import org.jfree.chart.servlet.ServletUtilities;


public class BarChartDemo {

/**
* 饼状图
*/
public static String generatePieChart(HttpSession session, PrintWriter pw,int w, int h){
String filename = null;
PieDataset dataset = getDataSet();
JFreeChart chart = ChartFactory.createPieChart3D(
"水果产量图", // 图表标题
dataset, // 数据集
true, // 是否显示图例
false, // 是否生成工具
false // 是否生成URL链接
);
chart.setBackgroundPaint(Color.pink);
try {
/*------得到chart的保存路径----*/
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
filename = ServletUtilities.saveChartAsPNG(chart, w, h, info,session);
/*------使用printWriter将文件写出----*/
ChartUtilities.writeImageMap(pw, filename, info, true);
pw.flush();
} catch (IOException e) {
e.printStackTrace();
}
return filename;
}


/**
* 柱状图
*/
public static String generateBarChart(HttpSession session, PrintWriter pw,int w, int h){
String filename = null;
CategoryDataset dataset = getDataSet2();
JFreeChart chart = ChartFactory.createBarChart3D(
"水果产量图", // 图表标题
"水果", // 目录轴的显示标签
"产量", // 数值轴的显示标签
dataset, // 数据集
PlotOrientation.VERTICAL, // 图表方向：水平、垂直
true, // 是否显示图例(对于简单的柱状图必须是false)
false, // 是否生成工具
false // 是否生成URL链接
);
try {
/*------得到chart的保存路径----*/
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
filename = ServletUtilities.saveChartAsPNG(chart, w, h, info,session);
/*------使用printWriter将文件写出----*/
ChartUtilities.writeImageMap(pw, filename, info, true);
pw.flush();
} catch (IOException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}
return filename;
}

/**
* 折线图
*/
public static String generateLineChart(HttpSession session, PrintWriter pw,int w, int h){
String filename = null;
CategoryDataset dataset = getDataSet3();
JFreeChart chart = ChartFactory.createLineChart(
"水果产量图", // 图表标题
"水果", // 目录轴的显示标签
"产量", // 数值轴的显示标签
dataset, // 数据集
PlotOrientation.VERTICAL, // 图表方向：水平、垂直
true, // 是否显示图例(对于简单的柱状图必须是false)
false, // 是否生成工具
false // 是否生成URL链接
);

/*----------设置消除字体的锯齿渲染（解决中文问题）--------------*/
chart.getRenderingHints().put(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);

/*------------配置图表属性--------------*/
// 1,设置整个图表背景颜色
chart.setBackgroundPaint(Color.pink);

/*------------设定Plot参数-------------*/
CategoryPlot plot = chart.getCategoryPlot();
// 2,设置详细图表的显示细节部分的背景颜色
//plot.setBackgroundPaint(Color.PINK);
// 3,设置垂直网格线颜色
plot.setDomainGridlinePaint(Color.black);
//4,设置是否显示垂直网格线
plot.setDomainGridlinesVisible(true);
//5,设置水平网格线颜色
plot.setRangeGridlinePaint(Color.blue);
//6,设置是否显示水平网格线
plot.setRangeGridlinesVisible(true);

try {
/*------得到chart的保存路径----*/
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
filename = ServletUtilities.saveChartAsPNG(chart, w, h, info,session);
/*------使用printWriter将文件写出----*/
ChartUtilities.writeImageMap(pw, filename, info, true);
pw.flush();
} catch (IOException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}
return filename;
}

/**
* 在本地生成图片文件
*/
public static void ganarateFruitChart(){
CategoryDataset dataset = getDataSet2();
JFreeChart chart = ChartFactory.createBarChart3D(
"水果产量图", // 图表标题
"月份", // 目录轴的显示标签
"产量（公斤）", // 数值轴的显示标签
dataset, // 数据集
PlotOrientation.VERTICAL, // 图表方向：水平、垂直
true, // 是否显示图例(对于简单的柱状图必须是false)
false, // 是否生成工具
false // 是否生成URL链接
);

FileOutputStream fos_jpg = null;
try {
fos_jpg = new FileOutputStream("D://fruit.jpg");
ChartUtilities.writeChartAsJPEG(fos_jpg,1.0f,chart,400,300,null);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fos_jpg.close();
} catch (Exception e) {}
}
}


/**
* 获取一个饼状图的简单数据集对象
* @return
*/
private static PieDataset getDataSet() {
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("苹果", 100);
dataset.setValue("梨子", 200);
dataset.setValue("葡萄", 300);
dataset.setValue("香蕉", 400);
dataset.setValue("荔枝", 500);
return dataset;
}


/**
* 获取一个柱状图数据集对象
* @return
*/
private static CategoryDataset getDataSet2() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(100, "北京", "苹果");
dataset.addValue(500, "北京", "荔枝");
dataset.addValue(400, "北京", "香蕉");
dataset.addValue(200, "北京", "梨子");
dataset.addValue(300, "北京", "葡萄");
dataset.addValue(500, "上海", "葡萄");
dataset.addValue(600, "上海", "梨子");
dataset.addValue(400, "上海", "香蕉");
dataset.addValue(700, "上海", "苹果");
dataset.addValue(300, "上海", "荔枝");
dataset.addValue(300, "广州", "苹果");
dataset.addValue(200, "广州", "梨子");
dataset.addValue(500, "广州", "香蕉");
dataset.addValue(400, "广州", "葡萄");
dataset.addValue(700, "广州", "荔枝");
return dataset;
}

/**
* 获取一个折线图数据集对象
* @return
*/
private static CategoryDataset getDataSet3() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(100, "北京", "一月");
dataset.addValue(200, "北京", "二月");
dataset.addValue(100, "北京", "三月");
dataset.addValue(400, "北京", "四月");
dataset.addValue(300, "北京", "五月");
dataset.addValue(500, "北京", "六月");
dataset.addValue(90, "北京", "七月");
dataset.addValue(700, "北京", "八月");
dataset.addValue(800, "北京", "九月");
dataset.addValue(1000, "北京", "十月");
dataset.addValue(300, "北京", "十一月");
dataset.addValue(700, "北京", "十二月");
dataset.addValue(1200, "上海", "一月");
dataset.addValue(1100, "上海", "二月");
dataset.addValue(1000, "上海", "三月");
dataset.addValue(900, "上海", "四月");
dataset.addValue(800, "上海", "五月");
dataset.addValue(700, "上海", "六月");
dataset.addValue(600, "上海", "七月");
dataset.addValue(500, "上海", "八月");
dataset.addValue(400, "上海", "九月");
dataset.addValue(300, "上海", "十月");
dataset.addValue(200, "上海", "十一月");
dataset.addValue(100, "上海", "十二月");
dataset.addValue(600, "武汉", "一月");
dataset.addValue(500, "武汉", "二月");
dataset.addValue(400, "武汉", "三月");
dataset.addValue(300, "武汉", "四月");
dataset.addValue(200, "武汉", "五月");
dataset.addValue(100, "武汉", "六月");
dataset.addValue(200, "武汉", "七月");
dataset.addValue(300, "武汉", "八月");
dataset.addValue(400, "武汉", "九月");
dataset.addValue(500, "武汉", "十月");
dataset.addValue(600, "武汉", "十一月");
dataset.addValue(700, "武汉", "十二月");
return dataset;
}

/**
* @param args
*/
public static void main(String[] args) {
ganarateFruitChart();
}
}

/*jsp文件*/
<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="java.io.PrintWriter"%>
<jsp:directive.page import="com.cn.BarChartDemo"/>
<html>
<head>
<title>
</title>
<%
//饼状图
String fileNamePie=BarChartDemo.generatePieChart(session,new PrintWriter(out),580,250);
String graphURLPie = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileNamePie;
//饼状图
String fileNameBar=BarChartDemo.generateBarChart(session,new PrintWriter(out),580,250);
String graphURLBar = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileNameBar;
//折线图
String fileNameLine=BarChartDemo.generateLineChart(session,new PrintWriter(out),580,250);
String graphURLLine = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileNameLine;
%>
</head>
<body bgcolor="#ffffff">
<table align="center" width="580" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<img src="<%= graphURLPie %>"width=580 height=250 border=0 >
</td>
</tr>
<tr>
<td>
<img src="<%= graphURLBar %>"width=580 height=250 border=0 >
</td>
</tr>
<tr>
<td>
<img src="<%= graphURLLine %>"width=580 height=250 border=0 >
</td>
</tr>
</table>
</body>
</html>

/*web.xml文件*/
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<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>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

 

以上为转载，自己加了部分代码。觉得有用发出来供大家学习