首先尝试获取您要添加combobox 的位置的Container。
然后只需将组合框添加到该容器。
例如这里首先我找到了Save 和Cancel 按钮的Container 面板。
JPanel panel1 = (JPanel)this.getComponent(3);
JPanel panel2 = (JPanel) panel1.getComponent(3);
然后我在 panel2 中添加了组合框
panel2.add(comboBox);
它看起来像：
完整代码：
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
public class TestFilechooser extends JFrame {
private JPanel contentPane;
MyFileChooser jc;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TestFilechooser frame = new TestFilechooser();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public TestFilechooser() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
jc = new MyFileChooser();
JButton btnOpen = new JButton("open");
contentPane.add(btnOpen, BorderLayout.NORTH);
btnOpen.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int returnVal = jc.showOpenDialog(TestFilechooser.this);
}
});
pack();
}
}
class MyFileChooser extends JFileChooser{
public MyFileChooser() {
JComboBox comboBox = new JComboBox();
comboBox.setModel(new DefaultComboBoxModel(new String[] { "Item 1", "Item 2" }));
JPanel panel1 = (JPanel)this.getComponent(3);
JPanel panel2 = (JPanel) panel1.getComponent(3);
Component c1=panel2.getComponent(0);//optional used to add the buttons after combobox
Component c2=panel2.getComponent(1);//optional used to add the buttons after combobox
panel2.removeAll();
panel2.add(comboBox);
panel2.add(c1);//optional used to add the buttons after combobox
panel2.add(c2);//optional used to add the buttons after combobox
}
}
简单的过程：
此解决方案不会在底部添加组合框，但我认为它可以帮助您。
像这样改变你的班级：
class MyFileChooser extends JFileChooser{
public MyFileChooser() {
JComboBox comboBox = new JComboBox();
comboBox.setModel(new DefaultComboBoxModel(new String[] { "Item 1", "Item 2" }));
JPanel panel = new JPanel();
panel.add(comboBox);
setAccessory(panel);
//add(comboBox, BorderLayout.SOUTH);
}
}
结果：
示例的完整工作代码：
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
public class TestFilechooser extends JFrame {
private JPanel contentPane;
MyFileChooser jc;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TestFilechooser frame = new TestFilechooser();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public TestFilechooser() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
jc = new MyFileChooser();
JButton btnOpen = new JButton("open");
contentPane.add(btnOpen, BorderLayout.NORTH);
btnOpen.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int returnVal = jc.showOpenDialog(TestFilechooser.this);
}
});
pack();
}
}
class MyFileChooser extends JFileChooser{
public MyFileChooser() {
JComboBox comboBox = new JComboBox();
comboBox.setModel(new DefaultComboBoxModel(new String[] { "Item 1", "Item 2" }));
JPanel panel = new JPanel();
panel.add(comboBox);
setAccessory(panel);
//add(comboBox, BorderLayout.SOUTH);
}
}