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我有一个类从文本文件读取并将内容写入JTextArea。这工作正常，但即时无法将窗格的内容写回到不同的文本文件。其目的是让其他内容可以手动写入文本区域，然后在需要时保存到文件中。我有一个按钮，但它似乎没有做任何事情，当点击。任何建议都会很棒。无法读取JTextArea并写入文件
请注意，代码包含三个窗格（卡片）。我目前只使用card1。
由于
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.*;
public class MobileHome extends JFrame implements ActionListener {
final String card1Text = "Card 1";
final String card2Text = "Card 2";
final String card3Text = "Card 3";
final JPanel cards; //a panel that uses CardLayout
// button commands
final String FIRST = "FIRST";
final String NEXT = "NEXT";
final String PREVIOUS = "PREVIOUS";
final String LAST = "LAST";
File file = new File("mobOne.txt");
BufferedReader reader = null;
public String read()
{
String savetext = "";
try{
reader = new BufferedReader(new FileReader(file));
String text = null;
while((text = reader.readLine()) != null){
final String LS = System.getProperty("line.separator");
savetext += text + LS;
}
}
catch(IOException jim){
jim.printStackTrace();
}
return savetext;
}
public void actionPerformed(ActionEvent e) {
CardLayout cl = (CardLayout) (cards.getLayout());
String cmd = e.getActionCommand();
if (cmd.equals(FIRST)) {
cl.first(cards);
} else if (cmd.equals(NEXT)) {
cl.next(cards);
} else if (cmd.equals(PREVIOUS)) {
cl.previous(cards);
} else if (cmd.equals(LAST)) {
cl.last(cards);
}
}
JButton saveOne = new JButton("Save to file");
JTextArea mobOneText = new JTextArea("TextField on Card 1", 15, 20);
public MobileHome() {
super("Mobile Wizard");
//Create the "cards".
JPanel card1 = new JPanel();
saveOne.addActionListener(this);
card1.add(saveOne);
card1.add(mobOneText);
mobOneText.setText(read());
card1.setBackground(new Color(255,0,0));
JPanel card2 = new JPanel();
card2.add(new JTextField("TextField on Card 2", 20));
card2.setBackground(new Color(0,255,0));
JPanel card3 = new JPanel();
card3.add(new JLabel("Card 3"));
card3.setBackground(new Color(0,0,255));
//Create the panel that contains the "cards".
cards = new JPanel(new CardLayout());
cards.add(card1, card1Text);
cards.add(card2, card2Text);
cards.add(card3, card3Text);
JButton btn1 = new JButton("First");
btn1.setActionCommand(FIRST);
btn1.addActionListener(this);
JButton btn2 = new JButton("Next");
btn2.setActionCommand(NEXT);
btn2.addActionListener(this);
JButton btn3 = new JButton("Previous");
btn3.setActionCommand(PREVIOUS);
btn3.addActionListener(this);
JButton btn4 = new JButton("Last");
btn4.setActionCommand(LAST);
btn4.addActionListener(this);
JPanel controlButtons = new JPanel();
controlButtons.add(btn1);
controlButtons.add(btn2);
controlButtons.add(btn3);
controlButtons.add(btn4);
ImageIcon img = new ImageIcon("hand.jpg");
setIconImage(img.getImage());
Container pane = this.getContentPane();
pane.add(cards, BorderLayout.CENTER);
pane.add(controlButtons, BorderLayout.PAGE_END);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300, 200);
setVisible(true);
}
public void actionPerformed1(ActionEvent f) {
if (f.getSource().equals(saveOne)) {
try {
BufferedWriter fileOut = new BufferedWriter(new FileWriter("filename.txt"));
String myString1 =mobOneText.getText();
String myString2 = mobOneText.getText();
System.out.println(myString2);
fileOut.write(myString1);
fileOut.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
}
您的saveOne **可能**工作正常，但我敢打赌，您没有在文件的正确位置查找。你看过用户的目录吗？你知道，你可以通过println来查看'file.getAbsolutePath（）'返回的文件。 – 2013-05-02 03:28:49
您是否收到任何错误消息？ – Sanchit 2013-05-02 03:31:48
使用['JTextComponent.write（Writer）']（http://docs.oracle.com/javase/7/docs/api/javax/swing/text/JTextComponent.html#write%28java.io.Writer%290 ）代替。 – 2013-05-02 03:33:59