Swing JFormattedTextField 更正多行粘贴

Question

JFormattedTextField 有一个错误。它不支持多行输入，但允许粘贴多行文本。我知道如何禁用 copy/paste 功能，但这不是我想要的。是否可以拦截 "paste" 操作并从传入字符串中删除所有 \n？

漏洞证明：

package com;

import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class SwingTest {
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new SimpleFTF());
        f.pack();
        f.setVisible(true);
    }

    public static class SimpleFTF extends JPanel {
        public SimpleFTF(){
            JFormattedTextField field = new JFormattedTextField("    ");
            add(field, java.awt.BorderLayout.CENTER);
        }
    }
}

尝试粘贴：

1
2

Answer 1

您可以在 JFormattedTextField 上编写一个事件，这样如果粘贴了某些内容，它会删除 \n ascii 是 10 个字符并更新该字段。

Answer 2

/*Note This code works but if initial condition when you execute the code it will throw exception the the code works  
 Sorry but I don't know much about swing
*/
package com;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class SwingTest 
{
    public static void main(String[] args) 
    {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new SimpleFTF());
        f.pack();
        f.setVisible(true);
    }
    public static class SimpleFTF extends JPanel 
    {            
        public SimpleFTF()
        {
            JFormattedTextField field = new JFormattedTextField("    ");  
           field.getDocument().addDocumentListener(new DocumentListener() {
                @Override
                public void insertUpdate(DocumentEvent e) {
                    modify();   
                }
                @Override
                public void removeUpdate(DocumentEvent e) { 
                }
                @Override
                public void changedUpdate(DocumentEvent e) {                       
                }
                public void modify()
                {
                    String text=field.getText();
                    if(text.contains("\n"))
                        text=text.replaceAll("\n", "");
                        text=text.trim();
                        field.setText(text);
                }
            });                    
            add(field, java.awt.BorderLayout.CENTER);            
        }
    }
}

Swing JFormattedTextField 更正多行粘贴

Swing JFormattedTextField correcting multiline pasting

java

swing

copy-paste

jformattedtextfield