我想通过在程序外部提供列索引来实现JTable的排序。这是我的示例代码，其中我已初始化JTable，添加一列和30行到JTable。添加行后，我通过提供列索引0来排序JTable，但我无法获取排序数据。如何按排序顺序获取我的第一列？我的代码出了什么问题。为什么sortCTableonColumnIndex（）方法无法对指定列索引的数据进行排序？
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.RowSorter;
import javax.swing.SortOrder;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import javax.swing.table.TableRowSorter;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Admin
*/
public class Test {
private JTable oCTable;
private DefaultTableModel oDefaultTableModel;
private JScrollPane oPane;
private JTableHeader oTableHeader;
private TableRowSorter sorter;
public void adddata() {
for (int i = 0; i < 30; i++) {
Object[] row = new Object[1];
String sValueA = "A";
String sValueB = "A";
row[0] = "";
if (i % 2 == 0) {
if (i < 15) {
sValueA = sValueA + sValueA;
row[1] = sValueA;
} else {
if (i == 16) {
sValueB = "D";
row[1] = sValueA;
} else {
sValueB = sValueB + sValueB;
row[1] = sValueA;
}
}
} else {
if (i < 15) {
sValueB = sValueB + sValueB;
row[1] = sValueB;
} else {
if (i == 17) {
sValueB = "C";
row[1] = sValueB;
} else {
sValueB = sValueB + sValueB;
row[1] = sValueB;
}
}
}
}
}
public void createTable() {
oCTable = new JTable();
oDefaultTableModel = new DefaultTableModel();
oCTable.setModel(oDefaultTableModel);
oTableHeader = oCTable.getTableHeader();
oCTable.setAutoResizeMode(oCTable.AUTO_RESIZE_OFF);
oCTable.setFillsViewportHeight(true);
JTable oTable = new LineNumberTable(oCTable);
oPane = new JScrollPane(oCTable);
oPane.setRowHeaderView(oTable);
JPanel oJPanel = new JPanel();
oJPanel.setLayout(new BorderLayout());
oJPanel.add(oPane, BorderLayout.CENTER);
JDialog oDialog = new JDialog();
oDialog.add(oJPanel);
oDialog.setPreferredSize(new Dimension(500, 300));
oDialog.pack();
oDialog.setVisible(true);
}
public void insert() {
oDefaultTableModel.addColumn("Name");
int iColumnPlace = ((DefaultTableModel) oCTable.getModel()).findColumn("Name");
CellRendererForRowHeader oCellRendererForRowHeader = new CellRendererForRowHeader();
TableColumn Column = oCTable.getColumn(oTableHeader.getColumnModel().getColumn(iColumnPlace).getHeaderValue());
Column.setPreferredWidth(300);
Column.setMaxWidth(300);
Column.setMinWidth(250);
Column.setCellRenderer(oCellRendererForRowHeader);
for (int i = 0; i < 30; i++) {
Object[] row = new Object[1];
String sValueA = "A";
if (i % 2 == 0) {
if (i < 15) {
sValueA = sValueA + "a";
oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
oDefaultTableModel.setValueAt(sValueA, i, 0);
} else {
if (i == 16) {
sValueA = sValueA + "b";
oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
oDefaultTableModel.setValueAt(sValueA, i, 0);
} else {
sValueA = sValueA + "c";
oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
oDefaultTableModel.setValueAt(sValueA, i, 0);
}
}
} else {
if (i < 15) {
sValueA = sValueA + "d";
oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
oDefaultTableModel.setValueAt(sValueA, i, 0);
} else {
if (i == 17) {
sValueA = sValueA + "e";
oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
oDefaultTableModel.setValueAt(sValueA, i, 0);
} else {
sValueA = sValueA + "f";
oDefaultTableModel.insertRow(oCTable.getRowCount(), new Object[]{""});
oDefaultTableModel.setValueAt(sValueA, i, 0);
}
}
}
}
}
public void showTable() {
createTable();
insert();
sortCTableonColumnIndex(0, true);
}
public void sortCTableonColumnIndex(int iColumnIndex, boolean bIsAsc) {
sorter = new TableRowSorter(oDefaultTableModel);
List<RowSorter.SortKey> sortKeys = new ArrayList<RowSorter.SortKey>();
if (bIsAsc) {
sortKeys.add(new RowSorter.SortKey(iColumnIndex, SortOrder.ASCENDING));
} else {
sortKeys.add(new RowSorter.SortKey(iColumnIndex, SortOrder.DESCENDING));
}
sorter.setSortKeys(sortKeys);
oDefaultTableModel.fireTableStructureChanged();
oCTable.updateUI();
}
public static void main(String[] argu) {
Test oTest = new Test();
oTest.showTable();
}
class CellRendererForRowHeader extends DefaultTableCellRenderer {
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
JLabel label = null;
try {
label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (column == 0) {
label.setBackground(new JLabel().getBackground());
label.setForeground(Color.BLACK);
}
} catch (RuntimeException ex) {
}
return label;
}
}
class LineNumberTable extends JTable {
private JTable mainTable;
public LineNumberTable(JTable table) {
super();
mainTable = table;
setAutoCreateColumnsFromModel(false);
setModel(mainTable.getModel());
setAutoscrolls(false);
addColumn(new TableColumn());
getColumnModel().getColumn(0).setCellRenderer(mainTable.getTableHeader().getDefaultRenderer());
getColumnModel().getColumn(0).setPreferredWidth(40);
setPreferredScrollableViewportSize(getPreferredSize());
}
@Override
public boolean isCellEditable(int row, int column) {
return false;
}
@Override
public Object getValueAt(int row, int column) {
return Integer.valueOf(row + 1);
}
@Override
public int getRowHeight(int row) {
return mainTable.getRowHeight();
}
}
}
答案 0 :(得分：2)
方法的细微变化趋于促进分类。
public void sortCTableonColumnIndex(int iColumnIndex, boolean bIsAsc) {
oCTable.setAutoCreateRowSorter(true);
DefaultRowSorter sorter = ((DefaultRowSorter) oCTable.getRowSorter());
List<RowSorter.SortKey> sortKeys = new ArrayList<RowSorter.SortKey>();
if (bIsAsc) {
sortKeys.add(new RowSorter.SortKey(iColumnIndex, SortOrder.ASCENDING));
} else {
sortKeys.add(new RowSorter.SortKey(iColumnIndex, SortOrder.DESCENDING));
}
sorter.setSortKeys(sortKeys);
}
由于
答案 1 :(得分：2)
在编写Java代码时，你应该坚持Java coding standards，但无论你走哪条路，你都应该至少保持一致。
查看代码，实际上并没有在表格上设置分拣机。 From the JavaDocs您的代码中缺少以下内容：
TableModel myModel = createMyTableModel();
JTable table = new JTable(myModel);
table.setRowSorter(new TableRowSorter(myModel));
所以它会在你的代码中看起来像这样（或者至少删除了你的非标准约定）
public void createTable() {
tableModel = new DefaultTableModel();
table = new JTable(tableModel);
sorter = new TableRowSorter<DefaultTableModel>(tableModel);
table.setRowSorter(sorter);
...
}