在JTable中如何用enter键代替tab键的功能，这是一个坑；
在单元格处于编辑状态时按一次enter键，焦点水平移动；必须得按2次enter键才能水平移动；
其实这个问题的关键在于：光标在单元格中时，按enter键时table的keylistener监听不到键入事件，因此在table上对enter注册的action事件不能被触发；
为了能在单元格在编辑时也能触发enter事件，就必须对处于编辑的单元格添加keyListener，这样问题就能解决了；
关键代码：
1，对table注册按enter键时触发的事件：
InputMap enter = table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
enter.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER ,0),"ENTER");
table.getActionMap().put("ENTER", myAction);
2，在单元格被选中时，按enter键水平移动
Action myAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
int rowCount = table.getRowCount();
int colCount = table.getColumnCount();
if(rowCount <=0)return;
//取被选中状态的row/col
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
if(row < 0 || col < 0)return;
if(col < colCount-1) {
col+=1;
}else {
if(row < rowCount-1) {
col = 0;
row+=1;
}else {
row=col=0;
}
}
// table.setRowSelectionInterval(row, row);
// table.setColumnSelectionInterval(col, col);
table.changeSelection(row, col, false, false);
}
};
3,在单元格被编辑时，按enter键水平移动
table.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
// TODO Auto-generated method stub
}
/**焦点在单元格时enter键水平移动*/
@Override
public void focusLost(FocusEvent e) {
//在编辑单元格时，按enter键执行；如果不在被编辑单元格添键盘监听，
//那么处于编辑状态时，必须按2此enter键才会水平移动;
//因为第一次按enter时，焦点不在table中，不会触发enter事件
if(table.isEditing()) {
table.getEditorComponent().addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_ENTER) {
int rowCount = table.getRowCount();
int colCount = table.getColumnCount();
if(rowCount <=0)return;
//注意取编辑时的row/col
int row = table.getEditingRow();
int col = table.getEditingColumn();
if(row < 0 || col < 0)return;
if(col < colCount-1) {
col+=1;
}else {
if(row < rowCount-1) {
col = 0;
row+=1;
}else {
row=col=0;
}
//***注意这个换行时，有一个坑；在换行时会调用2次该方法，
//如果有对单元格的编辑后的校验，那就坑爹了，
//因此为了避免这个坑，可以在这里停止table的编辑
//如果没有编辑后事件校验，单纯的想用enter代替tab功能，那就不用stopEditing；
if(table.isEditing())
table.getCellEditor().stopCellEditing();
}
// table.setRowSelectionInterval(row, row);
// table.setColumnSelectionInterval(col, col);
table.changeSelection(row, col, false, false);
}
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
});
}
}
});
代码完整实现：
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package javaGUI;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Vector;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.DefaultCellEditor;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.KeyStroke;
import javax.swing.table.DefaultTableModel;
import javaGUI.Tab1.MyAction;
import javaGUI.Tab1.MyText;
public class TableCSDN extends JFrame implements ActionListener{
private JTable table;
private DefaultTableModel model;
private JScrollPane jsp1;
private JButton jb1,jb2,jb3,jb4;
private JPanel jp1;
public static void main(String[] args) {
new TableCSDN();
}
public TableCSDN() {
String[] name = new String[]{"列1","列2","列3","列4","列5"};
String[][] data = new String[5][5];
int value = 1;
for (int i=0; i<data.length; i++){
for(int j=0; j<data[i].length; j++){
data[i][j] = String.valueOf(value++);
}
}
model = new DefaultTableModel(data, name);
table = new JTable(model);
jsp1 = new JScrollPane(table);
jp1 = new JPanel();
jb1 = new JButton("添加列");
jb2 = new JButton("添加行");
jb3 = new JButton("删除列");
jb4 = new JButton("删除行");
this.add(jp1, BorderLayout.SOUTH);
jp1.add(jb2);
jp1.add(jb3);
jp1.add(jb4);
this.add(jsp1);
/***start焦点在table时，按enter键水平移动
*
* 只有焦点在table上时，才会执行这个action；
*
* */
Action myAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
int rowCount = table.getRowCount();
int colCount = table.getColumnCount();
if(rowCount <=0)return;
//取被选中状态的row/col
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
if(row < 0 || col < 0)return;
if(col < colCount-1) {
col+=1;
}else {
if(row < rowCount-1) {
col = 0;
row+=1;
}else {
row=col=0;
}
}
// table.setRowSelectionInterval(row, row);
// table.setColumnSelectionInterval(col, col);
table.changeSelection(row, col, false, false);
}
};
/**end 焦点在table时，按enter键水平移动;*/
InputMap enter = table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
enter.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER ,0),"ENTER");
table.getActionMap().put("ENTER", myAction);
table.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
// TODO Auto-generated method stub
}
/**焦点在单元格时enter键水平移动*/
@Override
public void focusLost(FocusEvent e) {
//在编辑单元格时，按enter键执行；如果不在被编辑单元格添键盘监听，
//那么处于编辑状态时，必须按2此enter键才会水平移动;
//因为第一次按enter时，焦点不在table中，不会触发enter事件
if(table.isEditing()) {
table.getEditorComponent().addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_ENTER) {
int rowCount = table.getRowCount();
int colCount = table.getColumnCount();
if(rowCount <=0)return;
//注意取编辑时的row/col
int row = table.getEditingRow();
int col = table.getEditingColumn();
if(row < 0 || col < 0)return;
if(col < colCount-1) {
col+=1;
}else {
if(row < rowCount-1) {
col = 0;
row+=1;
}else {
row=col=0;
}
//***注意这个换行时，有一个坑；在换行时会调用2次该方法，
//如果有对单元格的编辑后的校验，那就坑爹了，
//因此为了避免这个坑，可以在这里停止table的编辑
//如果没有编辑后事件校验，单纯的想用enter代替tab功能，那就不用stopEditing；
if(table.isEditing())
table.getCellEditor().stopCellEditing();
}
// table.setRowSelectionInterval(row, row);
// table.setColumnSelectionInterval(col, col);
table.changeSelection(row, col, false, false);
}
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
});
}
}
});
jb2.addActionListener(this);
jb3.addActionListener(this);
jb4.addActionListener(this);
this.setSize(400, 400);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource().equals(jb1)){
model.addColumn("新增列");
}
//新增一行
if (e.getSource().equals(jb2)){
model.addRow(new Vector());
}
/**
* 删除列 做法： 先通过getColumnCount获取表格模型列数，通过 setColumnCount设置
* setColumnCount如果新大小 小于 当前大小，则将丢弃索引 columnCount 处及其之后的所有列
*/
if (e.getSource().equals(jb3)){
int col = model.getColumnCount()-1;
model.setColumnCount(col);
}
if (e.getSource().equals(jb4)){
int row = model.getRowCount()-1;
if(row < 0){
return ;
}
model.removeRow(row);
}
}
}