Question

我可以通过以下代码在文本字段txt1上打开文件。如何使用Buffered Reader或其他任何内容在同一功能的txt1字段中编辑后自动保存更改？

 private void btnOpenfileActionPerformed(java.awt.event.ActionEvent evt)                                            
{ 
 String file="";
  JFileChooser chooser = new JFileChooser("./");
    int i = chooser.showOpenDialog(null);
    if (i == 0) {
        File f = chooser.getSelectedFile();
        filelocation=f.getAbsolutePath();
    System.out.println(f); 

        try {
            FileReader fr = new FileReader(f); //file location passed
            BufferedReader br = new BufferedReader(fr);
            String temp = "";

                while ((temp = br.readLine()) != null) 
               {

               file += temp+"\n";

               }
            txt1.setText(file); //txt1 is a text field in split pane

            fr.close();
          } 
            catch (Exception e) 
           {
            System.out.println(e);
           }

}

Answer 1

要在JTextComponent中加载和保存文字，请参阅read(Reader,Object)＆amp; write(Writer)

用于检测JTextField add an action listener的更改（通常在用户按下回车键时触发）或a DocumentListener。

Answer 2

您需要一个Writer和一个保存按钮或其他东西来触发保存操作：

    final BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(myFile));
    try
    {
        bufferedWriter.write(text);
    }
    catch (final IOException exception)
    {
        // Error handling.
    }
    finally
    {
        bufferedWriter.close();
    }

编辑打开的文件后，如何保存更改？

2 个答案: