弱弱的问下ldh911，approveSelection()没选文件是不会被触发的
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。。。

[解决办法]
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);    }}