Java 后台下载文件

我是新来的。我有一个程序，我点击一个按钮，电影开始下载，但当它下载时，我什么都做不了，所以程序将关闭或仍然冻结（我要下载的文件是2GB。我的下载代码如下所示：

所以我希望我能在我的程序中做点什么，如果有人知道我如何添加进度条，那就太好了，这样我就能看到下载的进展了

if (!"Anschauen".equals(down.getText())) {
    try (BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("gedown.txt", true)))) {
        bw.write(titles.getText());
        bw.newLine();

        String fileName = (titles.getText()+".mp4"); //The file that will be saved on your computer
        URL link = new URL("http://s180.zerocdn.to/dl/63974fae7073944b11a7cf3e72e36cec/58b0d089/mm59cc5df499f1c21806495fea50072438.mp4"); //The file that you want to download

        switch (titles.getText()) {
            case "doesnotmatter":
                link = new URL("doesnotmatter");
                break;
            case "doesnotmatter":
                link = new URL("doesnotmatter");
                break;
            case "doesnotmatter":
                link = new URL("doesnotmatter");
                break;
            case "doesnotmatter":
                link = new URL("doesnotmatter");
                break;
            case "doesnotmatter":
                link = new URL("doesnotmatter");
                break;
            case "doesnotmatter":
                link = new URL("doesnotmatter");
                break;
        }

        ByteArrayOutputStream out;
        try (InputStream in = new BufferedInputStream(link.openStream())) {
            out = new ByteArrayOutputStream();
            byte[] buf = new byte[1024];
            int n = 0;
            while (-1!=(n=in.read(buf)))
            {
                out.write(buf, 0, n);
            }
            out.close();
        }
        byte[] response = out.toByteArray();

        FileOutputStream fos = new FileOutputStream(fileName);
        fos.write(response);
        fos.close();
    }
}
else {
    System.out.println("Noch nicht fertig");
}

您应该使用线程（）

---

您可能应该学习线程的概念（并且）将所有下载代码放在一个单独的类中，并将其作为线程运行。

public void run() {
    //This will be called when the thread starts.
    //Put the download code right here.
}

public static void main(String args[]) {
    //The class must implement Runnable. 
    Thread thread = new Thread(this, "Thread's name eg. Download  Thread");
    thread.start();
}