Question

我有一个看起来像这样的框架：

public class Load_Frame extends JFrame implements ActionListener{

    private JButton uploadButton, downloadButton;
    private JTextField uploadField;
    private String filename;
    private Client client;

    public Load_Frame(String username, Socket socket) {

        this.client = new Client(username, socket);

        uploadField = new JTextField ();
        uploadField.setBounds(60,100,450,30);
        uploadButton = new JButton ("Upload");
        uploadButton.setBounds(410,150,100,30);
        uploadButton.addActionListener(this);

        downloadButton = new JButton ("Download");
        downloadButton.setBounds(390,300,120,30);
        downloadButton.addActionListener(this);


        this.add(uploadField);
        this.add(uploadButton);
        this.add(downloadButton);
        this.setVisible(true);

    }

    public  void    actionPerformed(ActionEvent e)
    { 
        //Upload: 
        if  (e.getSource()== uploadButton) {
            this.filename = uploadField.getText();
            File file = new File(filename);             
            client.upload(file);
        }

        //Download
        else if (e.getSource()== downloadButton) {
            filename = (String) filesList.getSelectedItem();
            client.download(filename);
        }

}

我的问题是：我曾说过，框架和“进程”应该在不同的线程中分开，这样当进程失败时，框架就不会冻结。所以我需要我的客户成为一个新线程。

但是，我仍然需要访问那些“上传”和“下载”按钮。我读过我可以轻松地做到这一点：

public class Client implements Runnable, ActionListener{
    ...
    public void actionPerformed(ActionEvent e){
        if(e.getSource() == uploadButton){
            File file  = new File(filename); //how can i retrieve the filename??
            upload(file);
    }
}

并且我只需要在我的Frame类中添加另一个actionListener即可：

uploadButton.addActionListener(client);

（当然也可以下载）

我的难题是：如何获取文件名，即在Frame的TextField中写入的文本？我应该将此TextField作为客户端的参数吗？这会使代码看起来很奇怪，奇怪的是我不是很合逻辑，所以我希望有另一种方法。

Answer 1

您可以创建两个线程，一个用于下载，一个线程用于上载

public void actionPerformed(ActionEvent e){
   if(e.getSource()==uploadButton){
      new Thread(){
         public void run(){
          this.filename = uploadField.getText();
          File file = new File(filename);
          client.upload(file);
         }
      }.start();
   }
  else if(e.getSource() == downloadButton){
    new Thread(){
      public void run(){
        this.filename = downloadField.getText();
        File file = new File(filename);
        client.download(file);
      }
    }.start();
  }
}

java actionListener：在单独的线程中检索TextField

1 个答案: