将字节大小转换为Java可读格式吗？

Question

正在尝试创建静态方法String formatSize(long sizeInBytes)此方法需要针对提供的文件大小（以字节为单位）返回最合适的表示形式转换为人类可读的格式，至少应保留2个小数位（字节除外）。

这是我的代码

public class HexEditor {

    public static void main(String[] args) {
        System.out.println(formatSize(2147483647));
        System.out.println(formatSize(123));
        System.out.println(formatSize(83647));
        System.out.println(formatSize(9585631));
        System.out.println(formatSize(188900977659375L));
    }
    public static String floatForm (double d){
       return new DecimalFormat("#.##").format(d);
    }

    public static String formatSize(long size) {


        double B = 1 * 8;
        double kibit = 1024;
        double KiB = B * kibit;
        double MiB = KiB * kibit;
        double GiB = MiB * kibit;
        double TiB = GiB * kibit;
        double Pib = TiB * kibit;

        if (size < kibit) {
            return size + " byte";

        } else if (size < KiB) {
            double result = size / kibit;
            return floatForm (result) + " Kibit";

        } else if (size < MiB) {
            double result = size / KiB;
            return floatForm (result) + " KiB";

        } else if (size < GiB) {
            double result = size / MiB;
            return floatForm (result) + " MiB";

        } else if (size < TiB) {
            double result = size / GiB;
            return floatForm (result) + " GiB";

        } else if (size < Pib) {
            double result = size / TiB;
            return floatForm (result) + " TiB";
        }

        return "";
    }

}

这些是我的输入并期望输出

输入输出

2147483647          2.00 GiB
123                 123 bytes
83647               81.69 KiB
9585631             9.14 MiB
188900977659375     171.80 TiB

但是当我的代码运行时，它给出了不同的输出

    256 MiB
    123 byte
    10.21 KiB
    1.14 MiB
    21.48 TiB

我错了吗？或其他

Answer 1

您正在按位划分，但输入的字节数已已经。因此，除了

给下面的代码一个漩涡：

        double KiB = Math.pow(2, 10);
        double MiB = Math.pow(2, 20);
        double GiB = Math.pow(2, 30);
        double TiB = Math.pow(2, 40);
        double Pib = Math.pow(2, 50);

        System.out.println("KiB: " + DecimalFormat.getInstance().format(KiB));
        System.out.println("MiB: " + DecimalFormat.getInstance().format(MiB));
        System.out.println("GiB: " + DecimalFormat.getInstance().format(GiB));
        System.out.println("TiB: " + DecimalFormat.getInstance().format(TiB));
        System.out.println("Pib: " + DecimalFormat.getInstance().format(Pib));

        if (size < KiB) {
            return size + " byte";

        } else if (size < MiB) {
            double result = size / KiB;
            return floatForm(result) + " KiB";