爲什麼不正確的數據出現在甘特圖中？

Question

大家好，你好嗎？

我做了一個java應用程序來管理任務，我打算創建子任務的甘特圖。

我做了以下，但數據顯示不正確。

正如你從我發佈的圖片中可以看到的，雖然它們出現3個小節，但僅顯示來自單個子任務的數據。沒有出現在左側。我不知道爲什麼會發生這種情況。

有沒有人可以幫我解決這個小問題？

結果查詢：

SubTask StartDate  EndDate 
T3.1  2014-04-29 2014-06-05 
T3.2  2014-06-05 2014-06-05 
T3.3  2014-06-09 2014-06-09 

代碼

public class GantDemo { 

private static Date date(int day, int month, int year) { 

    Calendar calendar = Calendar.getInstance(); 
    calendar.set(year, month, day); 
    Date result = calendar.getTime(); 
    return result; 
} 

    public static void main(String[] args) { 

    Connection con = null; 
    TaskSeriesCollection collection = new TaskSeriesCollection(); 

    /* MySQL */ 
    String databaseURL = "jdbc:mysql://localhost:3306/tasks1.5"; 
    String driverName = "com.mysql.jdbc.Driver"; 
    String user = "****"; 
    String password = "*****"; 
    try { 
     Class.forName(driverName).newInstance(); 
    } catch (Exception ex) { 
     System.out.println(""); 
    } 

    try { 
     con = DriverManager.getConnection(databaseURL, user, password); 

     if (!con.isClosed()) { 
      System.out.println("Successfully connected to the DataBase Server..."); 
     } 

     Statement statement; 
     statement = con.createStatement(); 
     String selectQuery = "SELECT idSubTask, startDate, endDate FROM tasks where idTask like 'T3' "; 
     ResultSet resultSet = null; 
     resultSet = statement.executeQuery(selectQuery); 
     if (resultSet != null) // Success 
     { 
      while (resultSet.next()) { 


       String idSubTask = (String) resultSet.getObject("idSubTask "); 
       String startDate= (String) resultSet.getObject("startDate"); 
       String endDate = (String) resultSet.getObject("endDate "); 

       SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd"); 
       Date dateS = sdf2.parse(dataInicio); 
       SimpleDateFormat sdf3 = new SimpleDateFormat("yyyy-MM-dd"); 
       Date dateF = sdf3.parse(dataFim); 

       //DELETE 
       System.out.println("" + idSubTask + " " + startDate+ " " + endDate); 

       TaskSeries schedule1 = new TaskSeries("Scheduled Tasks"); 
       schedule1.add(new Task(idSubTask, 
         new SimpleTimePeriod(dateS, dateE))); 

       collection.add(schedule1); 

      } 
     } 
     resultSet.close(); 

    } catch (Exception e) { 
     System.out.println("" + e); 
    } 
    IntervalCategoryDataset dataset = collection; 
    JFreeChart chart = ChartFactory.createGanttChart(
      "Gantt Chart Example", // chart Heading 
      "SubTask", // X-axis label 
      "Date", // Y-axis label 
      dataset, // dataset 
      true, // legend 
      true, // tooltips 
      false // urls 
      ); 
    chart.setBackgroundPaint(new Color(0xff, 0xff, 0xcc)); 
    ChartFrame frame = new ChartFrame("Gantt Chart", chart); 
    frame.setVisible(true); 
    frame.setSize(400, 350); 
    } 
    } 

Answer 1

你重寫你的TaskSeries每次迭代。只向對象添加TaskSeries對象一次。

例子：

public class GantDemo { 
    public static void main(String[] args) throws ParseException { 

     TaskSeriesCollection collection = new TaskSeriesCollection(); 
     List<SubTask> list = new ArrayList<SubTask>(); 
     list.add(new SubTask("T3.1", "2014-04-29", "2014-06-05")); 
     list.add(new SubTask("T3.2", "2014-06-05", "2014-06-15")); 
     list.add(new SubTask("T3.3", "2014-06-09", "2014-06-19")); 
     TaskSeries schedule1 = new TaskSeries("Scheduled Tasks"); 
     for (SubTask task : list) { 
      Date dateS = new SimpleDateFormat("yyyy-MM-dd") 
        .parse(task.startDate); 
      Date dateE = new SimpleDateFormat("yyyy-MM-dd").parse(task.endDate); 

      schedule1.add(new Task(task.taskId, new SimpleTimePeriod(dateS, 
        dateE))); 

     } 
     collection.add(schedule1); 
     System.out.println(collection.toString()); 

     IntervalCategoryDataset dataset = collection; 
     JFreeChart chart = ChartFactory.createGanttChart("Gantt Chart Example", 
       "SubTask", // X-axis label 
       "Date", // Y-axis label 
       dataset, // dataset 
       true, // legend 
       true, // tooltips 
       false // urls 
       ); 
     chart.setBackgroundPaint(new Color(0xff, 0xff, 0xcc)); 
     ChartFrame frame = new ChartFrame("Gantt Chart", chart); 
     frame.setVisible(true); 
     frame.setSize(400, 350); 
    } 

    private static class SubTask { 
     private String taskId; 
     private String startDate; 
     private String endDate; 

     public SubTask(String taskId, String startDate, String endDate) { 
      super(); 
      this.taskId = taskId; 
      this.startDate = startDate; 
      this.endDate = endDate; 
     } 
    } 
} 

另一件事是，你的日期覆蓋，圖表將不積（子任務2和3）