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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！
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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