小编给大家分享一下如何通过JFreeChart实现在jsp页面画甘特图，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
首先把重要的代码粘出来供大家参考，项目源码和数据库信息表，以及参考的资料和一些资料的网址我就打包放在下面，大家可以下载后学习参考。
ProgressControl.java//完成从数据库读数据，生成甘特图。
package com.angrybirds.DAO; import java.io.IOException; import java.io.PrintWriter; //import java.util.Date; import java.sql.*; import java.util.ArrayList; import java.util.ListIterator; import javax.servlet.http.HttpSession; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartRenderingInfo; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.entity.StandardEntityCollection; import org.jfree.chart.servlet.ServletUtilities; import org.jfree.data.gantt.Task; import org.jfree.data.gantt.TaskSeries; import org.jfree.data.gantt.TaskSeriesCollection; public class ProgressControl { public static String createPlanGanttChart(String missionId,String missionName,HttpSession session,PrintWriter pw){ String fileName = null; Connection conn = null; Statement stmt = null; ResultSet rs = null; String sql = null; String sql2 = null; ArrayList nameList = new ArrayList(); ArrayList startList = new ArrayList(); ArrayList endList = new ArrayList(); conn = DB.getConnection(); stmt = DB.getStatement(conn); sql = "select * from SQLJ.Pro_control"; // where Task_id = '" + missionId + "'"; //System.out.println(sql); rs = DB.getResultSet(stmt, sql); try { while(rs.next()){ nameList.add(rs.getString("Task_name")); startList.add(rs.getDate("Plan_starttime")); endList.add(rs.getDate("Plan_endtime")); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } ListIterator iterN = nameList.listIterator(); ListIterator iterS = startList.listIterator(); ListIterator iterE = endList.listIterator(); TaskSeriesCollection tsc = new TaskSeriesCollection(); TaskSeries tsPlan = new TaskSeries("Plan"); while(iterN.hasNext()){ String submissionName = (String)iterN.next(); java.util.Date sDate = (java.util.Date)iterS.next(); java.util.Date eDate = (java.util.Date)iterE.next(); if(sDate.before(eDate)){ Task task = new Task(submissionName,sDate,eDate); tsPlan.add(task); } else{} } tsc.add(tsPlan);//tsc.add(tsPlan); JFreeChart chart = ChartFactory.createGanttChart(missionName + "GanttProject", "Project", "Time", tsc, true, true, true); ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection()); try { fileName = ServletUtilities.saveChartAsPNG(chart, 500, 80+65*nameList.size(), info,session); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { ChartUtilities.writeImageMap(pw, fileName, info,true); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { rs.close(); stmt.close(); conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } pw.flush(); //System.out.println(fileName); return fileName; } public static String createRealGanttChart(String missionId,String missionName,HttpSession session,PrintWriter pw){ String fileName = null; Connection conn = null; Statement stmt = null; ResultSet rs = null; String sql = null; String sql2 = null; ArrayList nameList = new ArrayList(); ArrayList startList = new ArrayList(); ArrayList endList = new ArrayList(); conn = DB.getConnection(); stmt = DB.getStatement(conn); sql = "select * from SQLJ.Pro_control"; // where Task_id = '" + missionId + "'"; //System.out.println(sql); rs = DB.getResultSet(stmt, sql); try { while(rs.next()){ nameList.add(rs.getString("Task_name")); startList.add(rs.getDate("Reality_starttime")); endList.add(rs.getDate("Reality_endtime")); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } //rs = null; //System.out.println("over:1"); ListIterator iterN = nameList.listIterator(); ListIterator iterS = startList.listIterator(); ListIterator iterE = endList.listIterator(); TaskSeriesCollection tsc = new TaskSeriesCollection(); //TaskSeries tsPlan = new TaskSeries("Plan"); TaskSeries tsReal = new TaskSeries("Real"); while(iterN.hasNext()){ String submissionName = (String)iterN.next(); java.util.Date sDate = (java.util.Date)iterS.next(); java.util.Date eDate = (java.util.Date)iterE.next(); if(sDate.before(eDate)){ Task task = new Task(submissionName,sDate,eDate); tsReal.add(task); } else{} } tsc.add(tsReal);//tsc.add(tsPlan); JFreeChart chart = ChartFactory.createGanttChart(missionName + "GanttProject", "Project", "Time", tsc, true, true, true); ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection()); try { fileName = ServletUtilities.saveChartAsPNG(chart, 500, 80+65*nameList.size(), info,session); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { ChartUtilities.writeImageMap(pw, fileName, info,true); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { rs.close(); stmt.close(); conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } pw.flush(); //System.out.println(fileName); return fileName; } }我把计划任务和实际任务分开画的甘特图，所以有两个甘特图的jsp页面
PlanGantt.jsp
<%@ page language="java" import="java.util.*,java.io.*" %> <%@ page import="com.angrybirds.DAO.ProgressControl"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>AngryBirds</title> <link href="css.css" rel="stylesheet" type="text/css" /> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> </head> <body> <div class="size"> <div class="header"> <div class="header01"> <div class="logo"> <img src="image/img_15.bmp" alt="" /> </div> </div> <div class="cmainimg"> <img alt="" src="image/img_73.jpg" /> </div> <div class="mnav"> <img class="mnimgl" src="image/img_37.jpg" alt="" /> <img class="mnimgr" src="image/img_50.jpg" alt="" /> <div class="mnm"> <ul> </ul> </div> </div> </div> <div class="content"> <div class="submenu" style="left: 0px; top: 0px"> <img class="snimgl" src="image/img_96.jpg" alt="" /> <img class="snimgr" src="image/img_107.jpg" alt="" /> <div class="subtext"> You are here:Home </div> <div class="subimag" style="width: 41px; height: 51px"> <ul> <li>1</li> <li>2</li> <li>3</li> </ul> </div> </div> <div class="mcontent"> <!--***************************************************************************×ó/--> <!--***************************************************************************ÓÒ/--> <div align="center" class="mcmid3"> <% String missionId = "1"; String filename = ProgressControl.createPlanGanttChart(missionId,"AllProject",session,new PrintWriter(out)); String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename; %> <img src="<%=graphURL %>" width="500" height="300" border="0" usemap="#<%=filename %>"> </div> <!--***************************************************************************/--> </div> </div> <div class="footer"> <img class="mnimgl" src="image/img_275.jpg" alt="" /> <img class="mnimgr" src="image/img_291.jpg" alt="" /> <a href="http://www.88web.org/">HOME</a> | <a href="http://www.88web.org/">ABOUT US</a> | <a href="http://www.88web.org/">GALLERY</a> | <a href="http://www.88web.org/">FAQ</a> | <a href="http://www.88web.org/">SERVICES</a> | <a href="http://www.88web.org/">CONTACT</a> <br/> <font color="#333333">Copyright 2009 Your Website | <a style="color: #333333" href="http://www.88web.org/css-templates/">CSS Template</a> by <a style="color: #333333" href="http://www.88web.org/">AngryBirds</a></font></div> </div> </body> </html>
RealGantt.jsp
<%@ page language="java" import="java.util.*,java.io.*" pageEncoding="GBK"%> <%@ page import="com.angrybirds.DAO.ProgressControl"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>AngryBirds</title> <link href="css.css" rel="stylesheet" type="text/css" /> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> </head> <body> <div class="size"> <div class="header"> <div class="header01"> <div class="logo"> <img src="image/img_15.bmp" alt="" /> </div> </div> <div class="cmainimg"> <img alt="" src="image/img_73.jpg" /> </div> <div class="mnav"> <img class="mnimgl" src="image/img_37.jpg" alt="" /> <img class="mnimgr" src="image/img_50.jpg" alt="" /> <div class="mnm"> <ul> </ul> </div> </div> </div> <div class="content"> <div class="submenu" style="left: 0px; top: 0px"> <img class="snimgl" src="image/img_96.jpg" alt="" /> <img class="snimgr" src="image/img_107.jpg" alt="" /> <div class="subtext"> You are here:Home </div> <div class="subimag" style="width: 41px; height: 51px"> <ul> <li>1</li> <li>2</li> <li>3</li> </ul> </div> </div> <div class="mcontent"> <!--***************************************************************************左/--> <!--***************************************************************************右/--> <div align="center" class="mcmid3"> <% String missionId = "1"; String filename = ProgressControl.createRealGanttChart(missionId,"AllProject",session,new PrintWriter(out)); String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename; %> <img src="<%=graphURL %>" width="500" height="300" border="0" usemap="#<%=filename %>"> </div> <!--***************************************************************************/--> </div> </div> <div class="footer"> <img class="mnimgl" src="image/img_275.jpg" alt="" /> <img class="mnimgr" src="image/img_291.jpg" alt="" /> <a href="http://www.88web.org/">HOME</a> | <a href="http://www.88web.org/">ABOUT US</a> | <a href="http://www.88web.org/">GALLERY</a> | <a href="http://www.88web.org/">FAQ</a> | <a href="http://www.88web.org/">SERVICES</a> | <a href="http://www.88web.org/">CONTACT</a> <br/> <font color="#333333">Copyright 2009 Your Website | <a style="color: #333333" href="http://www.88web.org/css-templates/">CSS Template</a> by <a style="color: #333333" href="http://www.88web.org/">AngryBirds</a></font></div> </div> </body> </html>
此图为效果图：（由于我用的是DB2所以时间显示有点问题，如果要想甘特图有更好的显示效果可以参考API文档中相关类和方法
地址：http://www.jfree.org/jfreechart/api/javadoc/index.html）
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