从DocumentListener获取更改的文本

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Document;

public class TextChangeListener implements DocumentListener {
    @Override
    public void insertUpdate(DocumentEvent e) {
        // 文本插入时的处理逻辑
        Document document = e.getDocument();
        String newText = "";
        try {
            newText = document.getText(0, document.getLength());
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        System.out.println("插入的文本：" + newText);
    }

    @Override
    public void removeUpdate(DocumentEvent e) {
        // 文本删除时的处理逻辑
        Document document = e.getDocument();
        String newText = "";
        try {
            newText = document.getText(0, document.getLength());
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        System.out.println("删除后的文本：" + newText);
    }

    @Override
    public void changedUpdate(DocumentEvent e) {
        // 文本属性变化时的处理逻辑
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Text Change Listener");
        JTextField textField = new JTextField();
        textField.getDocument().addDocumentListener(new TextChangeListener());
        frame.getContentPane().add(textField);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}