转载自   JfreeChart实现甘特图

一、甘特图简介

甘特图(Gantt chart)又称为横道图、条状图(Bar chart)。以提出者亨利·L·甘特先生的名字命名。

甘特图内在思想简单，即以图示的方式通过活动列表和时间刻度形象地表示出任何特定项目的活动顺序与持续时间。基本是一条线条图，横轴表示时间，纵轴表示活动(项目)，线条表示在整个期间上计划和实际的活动完成情况。它直观地表明任务计划在什么时候进行，及实际进展与计划要求的对比。

 

二、实例

 

package com.test.Gannt;import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;import javax.swing.JFrame;import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.data.category.IntervalCategoryDataset;
import org.jfree.data.gantt.Task;
import org.jfree.data.gantt.TaskSeries;
import org.jfree.data.gantt.TaskSeriesCollection;/** 
* @author Danny
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class GanttChart{public static void main(String[] args) {IntervalCategoryDataset dataset = createSampleDataset();JFreeChart chart = ChartFactory.createGanttChart("任务管理系统", "任务各阶段详细实施计划", "任务周期", dataset,false, false, false);CategoryPlot plot=chart.getCategoryPlot();chart.getTitle().setFont(new Font("新宋体",Font.BOLD,20));CategoryAxis domainAxis=plot.getDomainAxis();//水平底部列表domainAxis.setLabelFont(new Font("新宋体",Font.BOLD,14));//水平底部标题domainAxis.setTickLabelFont(new Font("新宋体",Font.BOLD,12));//垂直标题ValueAxis rangeAxis = plot.getRangeAxis();rangeAxis.setLabelFont(new Font("新宋体",Font.BOLD,16));//用来控制时间轴的显示,防止乱码DateAxis da = (DateAxis)plot.getRangeAxis(0);da.setDateFormatOverride(new SimpleDateFormat("yyyy-MM-dd"));FileOutputStream fop = null;try{System.out.println("Danny>> begin.");fop = new FileOutputStream("D:\\gantt.jpg");ChartUtilities.writeChartAsJPEG(fop,1f, chart, 800, 600,null);System.out.println("Danny>> end..");System.out.println("Danny>> successful...");} catch (IOException e){e.printStackTrace();} finally{try{fop.close();} catch (IOException e){e.printStackTrace();}}}/** *//*** Utility method for creating <code>Date</code> objects.** @param day 日* @param month 月* @param year 年** @return a date.*/private static Date date(final int day, final int month, final int year){final Calendar calendar = Calendar.getInstance();calendar.set(year, month, day);final Date result = calendar.getTime();return result;}/** ** @return The dataset.*/private static IntervalCategoryDataset createSampleDataset() {final TaskSeries s1 = new TaskSeries("SCHEDULE");final Task t1 = new Task("任务1", date(1, Calendar.JANUARY, 2001), date(5, Calendar.APRIL, 2001));t1.setPercentComplete(0.8);s1.add(t1);// 创建一个任务并插入两个子任务final Task t3 = new Task("任务2", date(10, Calendar.APRIL, 2001), date(5, Calendar.MAY, 2001));final Task st31 = new Task("需求1", date(10, Calendar.APRIL, 2001), date(25, Calendar.APRIL, 2001));st31.setPercentComplete(0.50);final Task st32 = new Task("需求2", date(1, Calendar.MAY, 2001), date(5, Calendar.MAY, 2001));st32.setPercentComplete(1.0);t3.addSubtask(st31);t3.addSubtask(st32);s1.add(t3);final Task t5 = new Task( "任务3", date(2, Calendar.JUNE, 2001), date(2, Calendar.JUNE, 2001)); s1.add(t5);final Task t6 = new Task("任务4", date(3, Calendar.MARCH, 2001), date(31, Calendar.JULY, 2001));t6.setPercentComplete(0.60);s1.add(t6);final Task t8 = new Task("任务结束", date(10, Calendar.AUGUST, 2001), date(10, Calendar.AUGUST, 2001));t8.setPercentComplete(0.0);s1.add(t8);final Task t9 = new Task("任务试用", date(12, Calendar.AUGUST, 2001), date(12, Calendar.SEPTEMBER, 2001));t9.setPercentComplete(0.0);s1.add(t9);final Task t10 = new Task("任务测试", date(13, Calendar.SEPTEMBER, 2001), date(31, Calendar.OCTOBER, 2001));t10.setPercentComplete(0.2);s1.add(t10);final Task t12 = new Task("全部结束", date(28, Calendar.NOVEMBER, 2001), date(30, Calendar.NOVEMBER, 2001));t12.setPercentComplete(0.0);s1.add(t12);final TaskSeriesCollection collection = new TaskSeriesCollection();collection.add(s1);return collection;}
}