昨天发了个帖：“高分雪地挥泪跪求获取JFileChooser弹出JDialog的按钮方法”
弱弱的问下ldh911，approveSelection()方法没选文件或者没填路径是不会被触发的,这就没办法判断所选文件路径是否为空了，在线等。。。
------解决方案--------------------------------------------------------
确实出了个难题啊，供参考了：
- Java code
import java.awt.*;import java.awt.event.*;import java.io.*;import java.lang.reflect.*;import javax.swing.*;import javax.swing.plaf.basic.*;public class TestJFileChooser extends JFileChooser { private boolean isSelected = false; public static void main(String[] args) { new TestJFileChooser().showOpenDialog(null); } @Override public int showDialog(Component parent, String approveButtonText) throws HeadlessException { if (this.ui instanceof BasicFileChooserUI) { try { Method method = BasicFileChooserUI.class.getDeclaredMethod("getApproveButton", JFileChooser.class); method.setAccessible(true); JButton btnApprove = (JButton) method.invoke(this.ui, this); System.out.println(btnApprove); btnApprove.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (TestJFileChooser.this.isSelected) { TestJFileChooser.this.isSelected = false; } else { JOptionPane.showMessageDialog(null, "Please select a file."); } } }); } catch (Exception e) { e.printStackTrace(); } } return super.showDialog(parent, approveButtonText); } @Override public void setSelectedFile(File file) { this.isSelected = true; super.setSelectedFile(file); }}