多线程计算文件夹大小并同时显示（多线程Java）

Question

我需要创建一个代码来计算系统中某个文件夹的大小，并在JLabel上显示进度（以KB为单位）。计数部分已经完成。我需要第二部分。它应该通过多线程（每100毫秒更改一次标签文本）来完成。先谢谢你。这是计数代码

public static long getFileSize(File folder) {

    long foldersize = 0;

    File[] filelist = folder.listFiles();
    for (int i = 0; i < filelist.length; i++) {

        if (filelist[i].isDirectory()) {

            foldersize += getFileSize(filelist[i]);

        } else {

            foldersize += filelist[i].length();

        }

    }

    return foldersize;
}

Answer 1

这是我自己找到的解决办法。上面的代码正在创建简单的UI。按钮计算给定路径的大小，并打印给定文件夹的大小以及给定路径中的文件和文件夹数

1. FolderSizeCounter。爪哇

公共类FileSizeCounter{

public static long getFileSize(File folder){


    long foldersize = 0;
    File[] filelist = folder.listFiles();
    if(filelist!=null){
        for (int i=0; i < filelist.length; i++) {

            if(!filelist[i].isDirectory() && !filelist[i].isFile()){

                UI.nonfilecount++;
            }
            if (filelist[i].isDirectory()) {

                foldersize += getFileSize(filelist[i]);
                UI.foldercount++;

            } else {
                foldersize += filelist[i].length();
                UI.size+=filelist[i].length();
                UI.filecount++;
            }

        }

    }

    return foldersize;
}

public static String getReadableSizeByte(long size) {
    if(size <= 0) return "0";
    final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" };
    int digitGroups = (int) (Math.log10(size)/Math.log10(1024));
    return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups))
            + " " + units[digitGroups];
}

public static String getReadableSizeK(long size) {
    if(size <= 0) return "0";
    final String[] units = new String[] { " ","K", "M", "B", "T"};
    int digitGroups = (int) (Math.log10(size)/Math.log10(1000));
    return new DecimalFormat("#,##0.#").format(size/Math.pow(1000, digitGroups))
            + " " + units[digitGroups];
}

}

1. 用户界面。爪哇

公共类UI实现ActionListener{

private JFrame fr;
private JPanel pn;
static JLabel folderSize, info, folderCountlbl, fileCountlbl;
private JTextField tf;
private JButton but;
public static long size, foldercount, filecount, nonfilecount;
public int i = 0;

public UI() {

    fr = new JFrame();

    pn = new JPanel();

    info = new JLabel("Type the folder path !!!");
    folderSize = new JLabel();
    folderCountlbl = new JLabel();
    fileCountlbl = new JLabel();

    tf = new JTextField(12);

    but = new JButton("Count the size !!!");

    pn.add(info);
    pn.add(tf);
    pn.add(but);
    pn.add(folderSize);
    pn.add(folderCountlbl);
    pn.add(fileCountlbl);

    but.addActionListener(this);

    fr.add(pn);

    fr.setSize(220, 180);
    fr.setLocationRelativeTo(null);
    fr.setResizable(false);
    fr.setVisible(true);
    fr.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

}

@Override
public void actionPerformed(ActionEvent e) {

    if (e.getSource() == but) {
        if (new File(tf.getText()).isDirectory()) {

            Thread t = new Thread(new Runnable() {

                @Override
                public void run() {

                    System.out.println(FileSizeCounter
                            .getReadableSizeByte(FileSizeCounter.getFileSize(new File(tf.getText()))));

                }
            });

            Thread t1 = new Thread(new Runnable() {

                @Override
                public void run() {
                    while (t.isAlive()) {

                        folderSize.setText("Size of the folder " + FileSizeCounter.getReadableSizeByte((size)));
                        folderCountlbl
                                .setText("Number of folders " + FileSizeCounter.getReadableSizeK(foldercount));
                        fileCountlbl.setText("Number of files " + FileSizeCounter.getReadableSizeK(filecount));
                        try {
                            Thread.sleep(1);
                        } catch (InterruptedException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }

                    }
                    folderSize.setText("Size of the folder " + FileSizeCounter.getReadableSizeByte((size)));
                    folderCountlbl.setText("Number of folders " + FileSizeCounter.getReadableSizeK(foldercount));
                    fileCountlbl.setText("Number of files " + FileSizeCounter.getReadableSizeK(filecount));
                }
            });
            t1.start();
            t.start();
        }

        else {
            JOptionPane.showMessageDialog(fr, "Wrong path. Try again.", "ERROR", JOptionPane.ERROR_MESSAGE);
            System.exit(0);

        }

    }
}

}

1. 和Main。爪哇

公共类主{

public static void main(String args[]) {

    new UI();
}

}

Answer 2

生成一个单独的线程来调用getFolderSize函数，并使foldersize成为一个静态可变变量。然后可以从UI线程访问foldersize，并使用它使用java.util.Timer定期更新JLabel