JFreeChart学习

来源：互联网发布：java实现dijkstra 编辑：程序博客网时间：2024/05/22 09:43

一 BarCharDemo
package net.neitbe.jfreechat;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;

/**
* @author neitbe
*/
public class BarCharDemo {

private static Log log       = LogFactory.getLog(BarCharDemo.class);

private static String path      = "D://fuit.jpeg";

/**
* 获取一个简单的数据集对象
* @return
*/
protected static CategoryDataset getDataSet() {
  DefaultCategoryDataset dataset    = new DefaultCategoryDataset();
  dataset.addValue(100,"","苹果");  //addValue()方法第二个参数干什么用的？
  dataset.addValue(200,"","梨子");
  dataset.addValue(300,"","葡萄");
  dataset.addValue(400,"","香蕉");
  dataset.addValue(500,"","荔枝");
  return dataset;
}

protected static CategoryDataset getDataSet2() {
  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  dataset.addValue(100, "北京", "苹果");
  dataset.addValue(130, "上海", "苹果");
  dataset.addValue(160, "广州", "苹果");
  dataset.addValue(200, "北京", "梨子");
  dataset.addValue(230, "上海", "梨子");
  dataset.addValue(260, "广州", "梨子");
  dataset.addValue(300, "北京", "葡萄");
  dataset.addValue(330, "上海", "葡萄");
  dataset.addValue(360, "广州", "葡萄");
  dataset.addValue(400, "北京", "香蕉");
  dataset.addValue(430, "上海", "香蕉");
  dataset.addValue(460, "广州", "香蕉");
  dataset.addValue(500, "北京", "荔枝");
  dataset.addValue(530, "上海", "荔枝");
  dataset.addValue(560, "广州", "荔枝");
  return dataset;
}

public static void main(String[] args) {
  CategoryDataset dataset     = getDataSet2();

  JFreeChart chart      = getChart(dataset);


  writePic(chart,path);
}

protected static JFreeChart getChart(CategoryDataset dataset) {


  JFreeChart chart      = ChartFactory.createBarChart3D(
    "水果产量图",       //图标标题
    "水果",        //目录轴显示标签（x轴）
    "产量",        //数据轴显示标签（y轴）
    dataset,       //数据集
    PlotOrientation.VERTICAL,   //图标方向：水平，垂直
    true,        //是否显示图例（简单的柱装图必须是fasle）
    false,        //是否生成工具
    false        //是否生成URL链接
    );
  return chart;
}

protected static void writePic(JFreeChart chart,String path) {
  FileOutputStream fos_jpg    = null;

  try {
   fos_jpg        = new FileOutputStream(path);
   ChartUtilities.writeChartAsJPEG(fos_jpg,100,chart,800,600,null);                    //几个参数是什么意思？
  } catch (FileNotFoundException e) {
   log.error("文件没有找到！",e);
  } catch (IOException e) {
   log.error("IO错误！",e);
  }
  finally {
   try {
    fos_jpg.close();
   } catch (IOException e) {
    log.error("IO异常",e);
   }
  }
}

}

二 PieChartDemo
package net.neitbe.jfreechat;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;

/**
* @author neitbe
*/
public class PieChartDemo extends BarCharDemo {

private static String path      = "D://fuit1.jpeg";

protected static JFreeChart getChart(PieDataset dataset) {


  JFreeChart chart      = ChartFactory.createPieChart3D(
    "水果产量图",       //图标标题
    dataset,       //数据集
    true,        //是否显示图例（简单的柱装图必须是fasle）
    false,        //是否生成工具
    false        //是否生成URL链接
    );
  return chart;
}

public static void main(String[] args) {
  PieDataset dataset     = getPicDataSet();

  JFreeChart chart      = getChart(dataset);


  writePic(chart,path);

}

private static PieDataset getPicDataSet() {
  DefaultPieDataset dataset    = new DefaultPieDataset ();
  dataset.setValue("苹果",100);
  dataset.setValue("梨",200);
  dataset.setValue("香蕉",300);
  dataset.setValue("芒果",400);
  dataset.setValue("葡萄",500);
  return dataset;
}
}

三 TimeSeriesDemo（在页面上显示）

首先配置web.xml
<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>

TimeSeriesDemo.java

package net.neitbe.home.jfreechart.business;

import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.io.IOException;

import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.TimeSeriesDataItem;

/**
* @author neitbe
*/
public class TimeSeriesDemo {

private static Log log    = LogFactory.getLog(TimeSeriesDemo.class);

//曲线图标题
private String title    = "趋势分析";
//曲线图X轴提示
private String domain    = "月份走势";
//曲线图Y轴提示
private String range    = "应收余额";
//曲线图自标题
private String subtitleStr   = "2005财年分析";

//创建时间数据源
//每一个TimeSeries在图上是一条曲线
private TimeSeries yongyou    = new TimeSeries("用友");
private TimeSeries jindie    = new TimeSeries("金碟");
private TimeSeries dongruan    = new TimeSeries("东软");

//时间曲线数据集合
private static TimeSeriesCollection dataset = new TimeSeriesCollection();

private void setDataset() {
  dataset.removeAllSeries();        //在javaBean中使用此类这个很重要，不然会不停的加入新的TimeSeries;
  dataset.addSeries(this.yongyou);
  dataset.addSeries(this.jindie);
  dataset.addSeries(this.dongruan);

}

private void setDongruan() {
  this.dongruan.clear();     //很重要，不然会报错
  /**
   * 报错
   * org.apache.jasper.JasperException: You are attempting to add an observation for the time period
   * 这里是在类属性里声明TimeSeries才用到的
   */
  for(int i = 1999; i < 2005; i++) {
   for(int mon = 0; mon < 12; mon++) {

    this.dongruan.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(300 - Math.random()*100)));
   }
  }
}

private void setJindie() {

  this.jindie.clear();    //很重要，不然会报错
  for(int i = 1999; i < 2005; i++) {
   for(int mon = 0; mon < 12; mon++) {
    this.jindie.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(400 - Math.random()*100)));
   }
  }
}

private void setYongyou() {
  this.yongyou.clear();   //很重要，不然会报错
  for(int i = 1999; i < 2005; i++) {
   for(int mon = 0; mon < 12; mon++) {
    this.yongyou.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(500 - Math.random()*100)));
   }
  }

}

private TimeSeriesCollection getDataset() {
  this.setDongruan();
  this.setJindie();
  this.setYongyou();
  this.setDataset();
  return dataset;
}

public String drawPic(HttpSession session) {
  String fileName       = null;
  JFreeChart chart      = ChartFactory.createTimeSeriesChart(title,domain,range,getDataset(),true,true,false);
  TextTitle subTitle      = new TextTitle(subtitleStr,new Font("黑体",Font.BOLD,12));
  chart.addSubtitle(subTitle);
  chart.setTitle(new TextTitle(title,new Font("隶书",Font.ITALIC,15)));
  chart.setBorderPaint(new GradientPaint(0,0,Color.white,0,1000,Color.blue));
  //String fileName       = "D://fuit2.jpeg";
  try {
   ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());

   log.debug("准备创建图片……");
   fileName       = ServletUtilities.saveChartAsJPEG(chart,600,600,info,session);
   log.debug("图片创建成功！");
  } catch (IOException e) {
   log.error("IO异常：",e);
  }
  log.debug("返回的文件名为：" + fileName);
  return fileName;
}

/*public static void main(String[] args) {
  TimeSeriesDemo timeSeriesDemo   = new TimeSeriesDemo();
  timeSeriesDemo.drawPic();
}*/

}

index.jsp页面：
<%@ 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>
<jsp:useBean id="timeSeries" scope="session" class="net.neitbe.home.jfreechart.business.TimeSeriesDemo"/>
</head>
<body>
<%
String fileName   = timeSeries.drawPic(request.getSession());
String graphURL   = request.getContextPath()+"/servlet/DisplayChart?filename=" + fileName;
%>
<%=graphURL%><br/>
<img src="<%= graphURL %>" width="400" height="400" border="1"/>
</body>
</html>