Question

java，swing,在 textField中输入完成后，直接按回车键就执行“查询”操作，怎么写代码？

final JButton button = new JButton("查询");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
database = textField.getText().trim();

c1=comboBox.getSelectedIndex();
switch(c1){

case 0: baite_select_reader.chaxunrenyuan();break;
// case 1: baite_select_book.chaxuntushu();break;
}
}
}); /////

Answer 1

使用的时候，只要将SwingUtils .enterPressesWhenFocused(JButton)这样就可以实现回车时候，触发按钮。

另外文本输入框回车触发事件则是：SwingUtils .enterPressesWhenFocused(JTextField textField,ActionListener actionListener) 。其中actionListener是需要触发的事件。

import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JTextField;
import javax.swing.KeyStroke;

//SwingUtils 实用方法类
public class SwingUtils {

/**
* 对指定的button添加回车驱动事件的功能
* @param button
*/
public static void enterPressesWhenFocused(JButton button) {
button.registerKeyboardAction(button.getActionForKeyStroke(KeyStroke
.getKeyStroke(KeyEvent.VK_SPACE, 0, false)),
KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false),
JComponent.WHEN_FOCUSED);

button.registerKeyboardAction(button.getActionForKeyStroke(KeyStroke
.getKeyStroke(KeyEvent.VK_SPACE, 0, true)),
KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true),
JComponent.WHEN_FOCUSED);
}