java - 使用 JFileChooser 读取文件名

Question

我正在使用文件输入流来输入文件

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String filename="D:\\abc.txt";
File file = new File(filename);

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到目前为止它工作正常。现在我想使用输入文件名JFileChooser，然后做同样的事情。但JFileChooser返回一个这样的字符串D:\abc.txt。我的代码如下

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public static String fileChose()
{
    JFileChooser fc= new JFileChooser();
    int ret = fc.showOpenDialog(null);

    if (ret== JFileChooser.APPROVE_OPTION) 
    {
        File file = fc.getSelectedFile();
        String filename= file.getAbsolutePath();
        return filename;
    }
    else
        return null;
}

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问题在于需要用分隔的文件名\\而不是\. 我不能以这样的方式直接从 JFileChooser 输入文件名，以便直接将其用作参数

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File file = new File(Classname.fileChose());

Answer 1

String s = fileChooser.getSelectedFile()

public String removeExtension(String s) {

    String separator = System.getProperty("file.separator");
    String filename;

    int lastSeparatorIndex = s.lastIndexOf(separator);
    if (lastSeparatorIndex == -1) {
        filename = s;
    } else {
        filename = s.substring(lastSeparatorIndex + 1);
    }

    int extensionIndex = filename.lastIndexOf(".");
    if (extensionIndex == -1)
        return filename;

    return filename.substring(0, extensionIndex);
}

Answer 2

试用

if (code == JFileChooser.APPROVE_OPTION) {
               File selectedFile = chooser.getSelectedFile();
               fileName = selectedFile.getName();
               FileInputStream fis = 
                  new FileInputStream(selectedFile);
               InputStreamReader in = 
                  new InputStreamReader(fis, Charset.forName("UTF-8")); 
               char[] buffer = new char[1024];
               int n = in.read(buffer);
               String text = new String(buffer, 0, n);
               myPane.setText(text);
               in.close();
            }

演示：

public class JEditorPaneFileChooser implements ActionListener {
   JFrame myFrame = null;
   JEditorPane myPane = null;
   JMenuItem cmdOpen = null;
   JMenuItem cmdSave = null;
   String dirName = "\\herong\\swing\\";
   String fileName = "JEditorPane.txt";

   public static void main(String[] a) {
      (new JEditorPaneFileChooser()).test();
   }
   private void test() {
      myFrame = new JFrame("JEditorPane JFileChooser Test");
      myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      myFrame.setSize(300,200);

      myPane = new JEditorPane();
      myPane.setContentType("text/plain");
      myPane.setText(
         "Hello computer! - \u7535\u8111\u4F60\u597D\uFF01\n"
         + "Welcome to Herong's Website!\n"
         + "\u6B22\u8FCE\u4F60\u8BBF\u95EE\u548C\u8363\u7F51\u7AD9"
         + "\uFF01\nwww.herongyang.com");
      myFrame.setContentPane(myPane);

      JMenuBar myBar = new JMenuBar();
      JMenu myMenu = getFileMenu();
      myBar.add(myMenu); 
      myFrame.setJMenuBar(myBar);

      myFrame.setVisible(true);
   }
   private JMenu getFileMenu() {
      JMenu myMenu = new JMenu("File");
      cmdOpen = new JMenuItem("Open");
      cmdOpen.addActionListener(this);
      myMenu.add(cmdOpen);

      cmdSave = new JMenuItem("Save");
      cmdSave.addActionListener(this);
      myMenu.add(cmdSave);
      return myMenu;
   }
   public void actionPerformed(ActionEvent e) {
      JFileChooser chooser = new JFileChooser();
      chooser.setCurrentDirectory(new File(dirName));
      chooser.setSelectedFile(new File(fileName));
      chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);

      FileNameExtensionFilter filter = new FileNameExtensionFilter(
        ".txt and .java files", "txt", "java");
      chooser.setFileFilter(filter);

      Object cmd = e.getSource();
      try {
         if (cmd == cmdOpen) {
            int code = chooser.showOpenDialog(myPane);
            if (code == JFileChooser.APPROVE_OPTION) {
               File selectedFile = chooser.getSelectedFile();
               fileName = selectedFile.getName();
               FileInputStream fis = 
                  new FileInputStream(selectedFile);
               InputStreamReader in = 
                  new InputStreamReader(fis, Charset.forName("UTF-8")); 
               char[] buffer = new char[1024];
               int n = in.read(buffer);
               String text = new String(buffer, 0, n);
               myPane.setText(text);
               in.close();
            }
         } else if (cmd == cmdSave) {
            int code = chooser.showOpenDialog(myPane);
            if (code == JFileChooser.APPROVE_OPTION) {
               File selectedFile = chooser.getSelectedFile();
               fileName = selectedFile.getName();
               FileOutputStream fos = 
                  new FileOutputStream(selectedFile);
               OutputStreamWriter out = 
                  new OutputStreamWriter(fos, Charset.forName("UTF-8")); 
               out.write(myPane.getText());
               out.close();
            }
         }
      } catch (Exception f) {
         f.printStackTrace();
      }
   }
}

参考：http ://www.herongyang.com/Swing/JEditorPane-File-Chooser-Dialog-Box.html