我正在嘗試JFileChooser單擊按鈕時保存文件。因此，當我單擊它時，窗口將按預期顯示，然后放入文件名并保存。一切正常，我將文件放置在正確的位置，并按需要將文件保存在.txt中，但是當我打開文件時，什么也沒進入。我已經測試過寫入和打印，但是沒有任何效果。所以我想知道我在哪里錯了，應該怎么做。謝謝 ！這是我的代碼：jbSave.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { JFileChooser fileChooser = new JFileChooser(); if (fileChooser.showSaveDialog(null) == JFileChooser.APPROVE_OPTION) { File file = fileChooser.getSelectedFile(); try { String path = file.getPath() + ".txt"; file = new File(path); FileWriter filewriter = new FileWriter(file.getPath(), true); BufferedWriter buff = new BufferedWriter(filewriter); PrintWriter writer = new PrintWriter(buff); writer.write("start"); } catch (FileNotFoundException e2) { e2.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } } } });
2 回答
交互式愛情
TA貢獻1712條經驗 獲得超3個贊
只是為該答案添加更多詳細信息或替代方法，您可以使用try-with-resource塊，讓JVM為您關閉（并刷新）編寫器。
try(PrintWriter writer = ...))
{
writer.write("start");
}
catch (IOException e)
{
// Handle exception.
}
此外，您可以編寫一個實用程序函數來創建PrintWriter：
/**
* Opens the file for writing, creating the file if it doesn't exist. Bytes will
* be written to the end of the file rather than the beginning.
*
* The returned PrintWriter uses a BufferedWriter internally to write text to
* the file in an efficient manner.
*
* @param path
* the path to the file
* @param cs
* the charset to use for encoding
* @return a new PrintWriter
* @throws IOException
* if an I/O error occurs opening or creating the file
* @throws SecurityException
* in the case of the default provider, and a security manager is
* installed, the checkWrite method is invoked to check write access
* to the file
* @see Files#newBufferedWriter(Path, Charset, java.nio.file.OpenOption...)
*/
public static PrintWriter newAppendingPrintWriter(Path path, Charset cs) throws IOException
{
return new PrintWriter(Files.newBufferedWriter(path, cs, CREATE, APPEND, WRITE));
}
如果所有數據都可以在一個操作中寫入，則另一種可能性是使用Files.write（）：
try
{
byte[] bytes = "start".getBytes(StandardCharsets.UTF_8);
Files.write(file.toPath(), bytes)
}
catch (IOException e)
{
// Handle exception.
}
- 2 回答
- 0 關注
- 200 瀏覽
添加回答
舉報
0/150
提交
取消