將JTable行設置爲不同顏色的代碼無法正常工作

Question

我開發了下面列出的代碼，該代碼不起作用，因爲它沒有將行的顏色設置爲黃色，因此從數據庫表中檢索相關聯的時間戳值大於前一行的1.5秒（1500毫秒）。我將只提供代碼的膽量，節省您不必看都行，如調試輸出，記錄異常等

private void processQueryResults(ResultSet results){ 
    Vector<Vector<String>> resultRows = new Vector<Vector<String>>(); 
    Vector<String> resultRowVector = null; 
    Vector<Timestamp> timestampVectors = null; 

    resultRows.clear(); 
    if (results != null){ 
     timestampVectors = new Vector<Timestamp>(); 
     While (results.next()){ 
      resultRowVector = new Vector<String>(); 
      timestampVectors.add(results.getTimestamp("timestamp_column"); 

      resultRowVector.add(results.getString("columnA"); 
      resultRowVector.add(results.getString("columnB"); 
      ..... 
      ..... 
      resultRows.add(resultRowVector); 
     } 
     JTable displayTable = 
      highlightResultRows(new DefaultTableModel(resultRows, colHdrs), 
           timestampVectors); 
     displayTable.setPreferredScrollableViewportSize(new Dimension(900,500)); 
     ...... 
     ...... 
    } 

    private JTable highlightResultRows(DefaultTableModel model, 
             final Vector<Timestamp> timestamps){ 
     Timestamp previousTimestamp = null; 
     JTable highlightedTable = new JTable(model){ 
      private static final long serialVersionUID = 1L; 
      public Component prepareRenderer(TableCellRenderer renderer, int row, int col){ 
       Component comp = super.prepareRenderer(renderer, row, col); 
       if (previousTimestamp != null){ 
        if (previousTimestamp.getTime() < (timestamps.get(row).getTime() - 1500)){ 
         comp.setBackground(Color.YELLOW); 
        } 
        else 
        { 
         comp.setBackground(Color.BLUE); 
        } 
       } 
       else 
       { 
        comp.setBackground(Color.BLUE); 
       } 
       previousTimestamp = timestamps.get(row); 
       System.out.println("previousTimestamp: [" + previousTimestamp.getTime() + "]"); 

       return comp; 
      } 
     }; 
     return highlightedTable; 
    } 

我所知道的是沒有發生的是prepareRenderer中的邏輯（）方法不執行，因爲用於顯示previousTimestamp設置爲什麼的卸載System.out.println不會被輸出。同樣所有的行都被設置爲BLUE的背景顏色。

Answer 1

在這種情況下，你可以介紹一個方法像下面，你可以通過你的jtable作爲參數：

public void filterRowsWithDifferentColor(JTable table) { 

    table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { 

     @Override 
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { 
      final Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); 

      if (!isSelected) { 
       try {//assuming the time displaying in your table column 3 with the given format (11:30) you can change it as you need 
        Time timeValue = new Time(new SimpleDateFormat("HH:mm") 
          .parse(table.getValueAt(row, 3).toString()).getTime()); 

        long startTime = timeValue.getTime(); 

        long endTime = System.currentTimeMillis(); 
        long differenceTime = endTime - startTime; 

        if (TimeUnit.MILLISECONDS.toMillis(differenceTime) > 1500) { 

         c.setBackground(Color.YELLOW); 

        } 
       } catch (ParseException ex) { 
        ex.printStackTrace(); 
       } 

      } 
      return c; 
     } 
    }); 

}