将文本从jTextArea保存（即另存为）到新的.txt文件中

Question

我正忙于将文字处理程序作为我的项目之一，我需要将输入jTextArea的文本另存为.txt文件，并带有用户选择的名称和位置。注意“
fc”是我已经声明的文件选择器的名称。

   public class TextEditor extends javax.swing.JFrame {

    int count = 2;
    JTextArea n = new JTextArea();
    final JFileChooser fc = new JFileChooser();

    public void SaveAs() {

        final JFileChooser SaveAs = new JFileChooser();
        SaveAs.setApproveButtonText("Save");
        int actionDialog = SaveAs.showOpenDialog(this);

        File fileName = new File(SaveAs.getSelectedFile() + ".txt");
        try {
            if (fileName == null) {
                return;
            }
            BufferedWriter outFile = new BufferedWriter(new FileWriter(fileName));
            outFile.write(n.getText()); //put in textfile

            outFile.close();
        } catch (IOException ex) {
        }

    }

Answer 1

我将使用JTetArea自己的write方法，因为这将使写入文件变得容易，并将很好地处理所有换行。例如（并借用您的代码）：

public class TextEditor extends JFrame {

   int count = 2;
   JTextArea n = new JTextArea();
   final JFileChooser fc = new JFileChooser();

   public void SaveAs() {

      final JFileChooser SaveAs = new JFileChooser();
      SaveAs.setApproveButtonText("Save");
      int actionDialog = SaveAs.showOpenDialog(this);
      if (actionDialog != JFileChooser.APPROVE_OPTION) {
         return;
      }

      File fileName = new File(SaveAs.getSelectedFile() + ".txt");
      BufferedWriter outFile = null;
      try {
         outFile = new BufferedWriter(new FileWriter(fileName));

         n.write(outFile);   // *** here: ***

      } catch (IOException ex) {
         ex.printStackTrace();
      } finally {
         if (outFile != null) {
            try {
               outFile.close();
            } catch (IOException e) {
               // one of the few times that I think that it's OK
               // to leave this blank
            }
         }
      }
   }

}

您的代码中有一些错误。例如，这可行

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.io.*;

import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;

@SuppressWarnings("serial")
public class TextEditor extends JFrame {

   int count = 2;
   JTextArea textArea = new JTextArea(10, 30);
   final JFileChooser fc = new JFileChooser();

   public TextEditor() {
      add(new JScrollPane(textArea));
      add(new JPanel(){{add(new JButton(new AbstractAction("Save As") {

         @Override
         public void actionPerformed(ActionEvent arg0) {
            saveAs();
         }
      }));}}, BorderLayout.SOUTH);
   }

   public void saveAs() {
      FileNameExtensionFilter extensionFilter = new FileNameExtensionFilter("Text File", "txt");
      final JFileChooser saveAsFileChooser = new JFileChooser();
      saveAsFileChooser.setApproveButtonText("Save");
      saveAsFileChooser.setFileFilter(extensionFilter);
      int actionDialog = saveAsFileChooser.showOpenDialog(this);
      if (actionDialog != JFileChooser.APPROVE_OPTION) {
         return;
      }

      // !! File fileName = new File(SaveAs.getSelectedFile() + ".txt");
      File file = saveAsFileChooser.getSelectedFile();
      if (!file.getName().endsWith(".txt")) {
         file = new File(file.getAbsolutePath() + ".txt");
      }

      BufferedWriter outFile = null;
      try {
         outFile = new BufferedWriter(new FileWriter(file));

         textArea.write(outFile);

      } catch (IOException ex) {
         ex.printStackTrace();
      } finally {
         if (outFile != null) {
            try {
               outFile.close();
            } catch (IOException e) {}
         }
      }
   }

   private static void createAndShowGui() {
      TextEditor frame = new TextEditor();

      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }

}