使用FileOutputStream下载时显示百分比

Question

我想知道如何使用此代码显示下载百分比。 如果您比我使用的方法更简单，请发布有关它的消息。

这是我的代码：

public class DownloadURL {

private static String URL;
private static String outputFile;

public static void setURL(String url){
    URL = url;
}

public static void setOutputFileName(String name){
    outputFile=name;
}

public static void resetURL(){
    URL = null;
}

public static void resetOutputFileName(){
    outputFile=null;
}

public static void downloadFromURL(){
    URL website;
    if (URL != null || outputFile != null) {
        try {
            website = new URL(URL);
            ReadableByteChannel rbc = Channels.newChannel(website.openStream());
            FileOutputStream fos = new FileOutputStream(outputFile);
            fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
            fos.close();
        } catch (Exception e) {
            Main.consolePrinter("Error in args or invalid page", new Type());
            resetOutputFileName();
            resetURL();
        }
    }
}

}

编辑：新代码

下载文件并在控制台中打印百分比：D

谢谢大家帮助我！

我是法国btw

public class DownloadURL {

private static String URL;
private static String outputFile;

public static void setURL(String url){
    URL = url;
}

public static void setOutputFileName(String name){
    outputFile=name;
}

public static void resetURL(){
    URL = null;
}

public static void resetOutputFileName(){
    outputFile=null;
}

public static void downloadFromURL(){
    if (URL != null || outputFile != null) {
        try {
            URL url = new URL(URL);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            int filesize = connection.getContentLength();
            float totalDataRead = 0;
            try (BufferedInputStream in = new BufferedInputStream(connection.getInputStream())) {
                FileOutputStream fos = new FileOutputStream(outputFile);
                try (java.io.BufferedOutputStream bout = new BufferedOutputStream(fos, 1024)) {
                    byte[] data = new byte[1024];
                    int i;
                    while ((i = in.read(data, 0, 1024)) >= 0) {
                        totalDataRead = totalDataRead + i;
                        bout.write(data, 0, i);
                        float Percent = (totalDataRead * 100) / filesize;
                        Main.consolePrinter("Downloading Percent : " + Percent + "%", new Type());
                    }
                }
            }
        } catch (Exception e) {
            javax.swing.JOptionPane.showConfirmDialog((java.awt.Component) null, e.getMessage(), "Error",
                    javax.swing.JOptionPane.DEFAULT_OPTION);
        }
    }else{
        Main.consolePrinter("Empty args !", new Type());
    }
}

}