Speichern einer aktuellen geöffneten Datei mit JFileChooser

Question

Hallo Ich habe Probleme beim Speichern derzeit geöffneter Dateien mit JFileChooser. Ich verstehe, wie man eine neue Datei mit showSaveDialog speichert, aber ich möchte eine Datei in JFileChooser öffnen, bearbeiten und speichern sie in der vorhandenen Datei, die ich geöffnet habe, anstatt ein Speichern als Menü zu öffnen.

Answer 1

public class EditorFrame extends JFrame { 

    /** 
    * @field serialVersionUID 
    */ 
    private static final long serialVersionUID = 1L; 

    private JTextArea textArea; 

    private JFileChooser jfc = new JFileChooser(System.getProperty("user.dir")); 

    public static void main(String[] args) { 
     EditorFrame frame = new EditorFrame(); 
     frame.init();  
    } 

    private void init(){ 
     this.setSize(640, 480); 
     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     this.setTitle("Editor"); 
     this.setContentPane(createContentPanel()); 
     this.setVisible(true); 
    } 
    /** 
    * @return 
    * @return Container 
    */ 
    private Container createContentPanel() { 
     JPanel jPanel = new JPanel(new BorderLayout()); 
     textArea = new JTextArea(); 
     jPanel.add(textArea,BorderLayout.CENTER); 
     jPanel.add(createButton(),BorderLayout.NORTH); 
     return jPanel; 
    } 

    /** 
    * @return 
    * @return Component 
    */ 
    private Component createButton() { 
     JPanel jPanel = new JPanel(new GridLayout(1, 2)); 
     JButton openButton = new JButton("Open"); 
     JButton saveButton = new JButton("Save"); 
     jPanel.add(openButton); 
     jPanel.add(saveButton); 
     openButton.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       int state = jfc.showOpenDialog(null); 
       if (state == 0) { 
        File f = jfc.getSelectedFile(); 
        try { 
         String textString = readText(new FileInputStream(f), "utf-8"); 
         textArea.setText(textString); 
        } catch (FileNotFoundException e1) { 
         e1.printStackTrace(); 
        }     
       }   
      } 
     }); 
     saveButton.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       writeText(textArea.getText(),jfc.getSelectedFile().getAbsolutePath()); 
      } 
     }); 
     return jPanel; 
    } 
    private String readText(final InputStream in, String charset) { 
     if (charset == null) { 
      charset = Charset.defaultCharset().toString(); 
     } 
     StringBuffer text = new StringBuffer(); 
     try { 
      BufferedReader br = new BufferedReader(new InputStreamReader(in, charset)); 
      String line = null; 
      while ((line = br.readLine()) != null) { 
       text.append(line + "\n"); 
      } 
      br.close(); 
     } catch (IOException e) { 
      throw new RuntimeException(e); 
     } 
     return text.toString(); 
    } 
    private void writeText(final String text, final String descPath) { 
     File root = new File(descPath.substring(0, descPath.lastIndexOf('\\'))); 
     if (!root.exists()) { 
      root.mkdirs(); 
     } 
     try { 
      // BufferedWriter bw = new BufferedWriter(new 
      // FileWriter(descPath)); 
      BufferedWriter bw = 
       new BufferedWriter(new OutputStreamWriter(new FileOutputStream(descPath), Charset.forName("UTF-8"))); 
      bw.write(text); 
      bw.close(); 
     } catch (Exception e) { 
      throw new RuntimeException(e); 
     } 
    } 
}