如何瀏覽java swing庫中的文件？

Question

我想知道在java swing庫中是否有某種J工具打開文件瀏覽器窗口並允許用戶選擇文件。那麼文件的輸出將是所選文件的絕對路徑。

由於提前，

Answer 1

可以使用JFileChooser類，檢查this example。

Answer 2

我結束了使用這種快速一塊是做正是我需要的代碼：

final JFileChooser fc = new JFileChooser(); 
fc.showOpenDialog(this); 

try { 
    // Open an input stream 
    Scanner reader = new Scanner(fc.getSelectedFile()); 
} 

Answer 3

下面的示例創建一個文件選擇器，並將其顯示爲第一個打開的文件對話框，然後作爲save-文件對話框：

String filename = File.separator+"tmp"; 
JFileChooser fc = new JFileChooser(new File(filename)); 

// Show open dialog; this method does not return until the dialog is closed 
fc.showOpenDialog(frame); 
File selFile = fc.getSelectedFile(); 

// Show save dialog; this method does not return until the dialog is closed 
fc.showSaveDialog(frame); 
selFile = fc.getSelectedFile(); 

這是一個更詳細的示例，它創建兩個按鈕來創建和顯示文件選擇器對話框。

// This action creates and shows a modal open-file dialog. 
public class OpenFileAction extends AbstractAction { 
    JFrame frame; 
    JFileChooser chooser; 

    OpenFileAction(JFrame frame, JFileChooser chooser) { 
     super("Open..."); 
     this.chooser = chooser; 
     this.frame = frame; 
    } 

    public void actionPerformed(ActionEvent evt) { 
     // Show dialog; this method does not return until dialog is closed 
     chooser.showOpenDialog(frame); 

     // Get the selected file 
     File file = chooser.getSelectedFile(); 
    } 
}; 

// This action creates and shows a modal save-file dialog. 
public class SaveFileAction extends AbstractAction { 
    JFileChooser chooser; 
    JFrame frame; 

    SaveFileAction(JFrame frame, JFileChooser chooser) { 
     super("Save As..."); 
     this.chooser = chooser; 
     this.frame = frame; 
    } 

    public void actionPerformed(ActionEvent evt) { 
     // Show dialog; this method does not return until dialog is closed 
     chooser.showSaveDialog(frame); 

     // Get the selected file 
     File file = chooser.getSelectedFile(); 
    } 
}; 

Answer 4

在WebStart和新的6u10 PlugIn中，即使沒有安全權限，也可以使用FileOpenService。出於顯而易見的原因，您只能獲取文件內容，而不是文件路徑。