我在将文本从 JTextArea 保存到文本文件时遇到问题。当我保存数据时,我的文本文件中没有任何内容。我觉得我写错了输出。有没有更好的编码方式?感谢您的帮助!
程序的类
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
public class SaveClass extends JPanel
{
JPanel cards;
private JPanel card1;
private JTextArea textarea1;
private JFileChooser fc;
public SaveClass()
{
Font mono = new Font("Monospaced", Font.PLAIN, 12);
textarea1 = new JTextArea();
textarea1.setFont(mono);
card1 = new JPanel();
card1.add(textarea1);
cards = new JPanel(new CardLayout());
cards.add(card1, "1");
add(cards, BorderLayout.CENTER);
setBorder(BorderFactory.createTitledBorder("Text here"));
setFont(mono);
}
public String getText1()
{
return this.textarea1.getText();
}
public void Save()
{
SaveClass sa = new SaveClass();
String text = sa.getText1();
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory( new File( "./") );
int actionDialog = chooser.showSaveDialog(this);
if (actionDialog == JFileChooser.APPROVE_OPTION)
{
File fileName = new File(chooser.getSelectedFile( ) + "" );
if(fileName == null)
return;
if(fileName.exists())
{
actionDialog = JOptionPane.showConfirmDialog(this,
"Replace existing file?");
if (actionDialog == JOptionPane.NO_OPTION)
return;
}
try
{
BufferedWriter out = new BufferedWriter(new FileWriter(fileName));
out.write(text);
out.close();
}
catch(Exception e)
{
System.err.println("Error: " + e.getMessage());
}
}
}
}
主程序
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class SaveMain extends JFrame
{
private SaveClass canvas;
private JPanel buttonPanel;
private JButton btnOne;
public SaveMain()
{
super("Save JTextArea text to a txt file");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
canvas = new SaveClass();
buildButtonPanel();
add(buttonPanel, BorderLayout.SOUTH);
add(canvas, BorderLayout.CENTER);
pack();
setSize(800, 800);
setVisible(true);
}
private void buildButtonPanel()
{
buttonPanel = new JPanel();
btnOne = new JButton("Save");
buttonPanel.add(btnOne);
btnOne.addActionListener(new btnOneListener());
}
private class btnOneListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == btnOne)
{
canvas.Save();
}
}
}
public static void main(String[] args)
{
new SaveMain();
}
}
最佳答案
我认为问题在于您在 Main 类中创建了一个 SaveClass 实例,但是在 Save 方法中,即在 SaveClass 中您创建了另一个实例,并从该实例中读取了文本。因此,您可能希望对 Save() 方法执行此操作:
delete the SaveClass sa = new SaveClass();
然后:
String text = this.getText1();
关于java - 将 JTextArea 文本保存到 txt 文件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9980840/