[英]JTable + Sorting specific field
I have a JTable and have added sorting.我有一个 JTable 并添加了排序。 Now the JTable has 5 columns and the 2nd column in a date field converted to DD/MM/YYYY and displayed in a JTextField in the cell.
现在 JTable 有 5 列,日期字段中的第二列转换为 DD/MM/YYYY 并显示在单元格的 JTextField 中。
When I sort it sorts as string and I the dates get mixed up, how do I change the behaviour of sorting for that particular column?当我将它排序为字符串并且日期混淆时,如何更改该特定列的排序行为?
eg.例如。 after sorting in ASC order, I get this:
按 ASC 顺序排序后,我得到:
01/02/2012
01/03/2011
01/04/2011
01/05/2011
01/06/2011
01/07/2011
01/08/2011
01/09/2011
01/10/2011
01/12/2011
Which is wrong, and I should be getting the result like这是错误的,我应该得到这样的结果
01/03/2011
01/04/2011
01/05/2011
01/06/2011
01/07/2011
01/08/2011
01/09/2011
01/10/2011
01/12/2011
01/02/2012
My code now looks like this for sorting我的代码现在看起来像这样用于排序
List<SortKey> sortKeys = new ArrayList<SortKey>();
sortKeys.add(new SortKey(2, SortOrder.ASCENDING));
table.getRowSorter().setSortKeys(sortKeys);
What should I change for that specific column only?我应该只为该特定列更改什么?
Because java.util.Date
implements Comparable<Date>
, it should be sufficient to let your TableModel
return Date.class
from getColumnClass()
for column two.因为
java.util.Date
实现Comparable<Date>
,让您的TableModel
从第二列的getColumnClass()
返回Date.class
应该就足够了。 Use a Custom Renderer to format the date as desired.使用自定义渲染器根据需要格式化日期。
Addendum: Here's an example using setDefaultRenderer()
.附录:这是一个使用
setDefaultRenderer()
的示例。
import java.awt.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
/** @see http://stackoverflow.com/questions/4553448 */
public class TableDate extends JPanel {
private static final int INT_COL = 0;
private static final int DATE_COL = 1;
private final Calendar calendar = Calendar.getInstance();
private final CustomModel model = new CustomModel();
private final JTable table = new JTable(model);
public TableDate() {
super(new GridLayout(1, 0));
table.setAutoCreateRowSorter(true);
table.setDefaultRenderer(Date.class, new DateRenderer());
table.setPreferredScrollableViewportSize(new Dimension(320, 240));
JScrollPane sp = new JScrollPane(table);
this.add(sp);
for (int i = 1; i <= 20; i++) {
model.addRow(newRow(i));
}
}
private Object[] newRow(int i) {
calendar.add(Calendar.DAY_OF_YEAR, 1);
return new Object[]{Integer.valueOf(i), calendar.getTime()};
}
private static class CustomModel extends DefaultTableModel {
private final String[] columnNames = {"Index", "Date"};
@Override
public Class<?> getColumnClass(int col) {
if (col == INT_COL) {
return Integer.class;
} else if (col == DATE_COL) {
return Date.class;
}
return super.getColumnClass(col);
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public String getColumnName(int col) {
return columnNames[col];
}
}
private static class DateRenderer extends DefaultTableCellRenderer {
DateFormat formatter = new SimpleDateFormat("MM/dd/yyyy");
public DateRenderer() {
super();
}
@Override
public void setValue(Object value) {
setText((value == null) ? "" : formatter.format(value));
}
}
private void display() {
JFrame f = new JFrame("TableDate");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new TableDate().display();
}
});
}
}
您需要实现将日期字符串视为Date
比较器,而不是简单的String
请看这里
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