java kb mb Gb转换工具类

好的，以下是Java中用于KB/MB/GB转换的工具类代码示例：

public class ConvertUtils {

    private static final long KB = 1024;
    private static final long MB = KB * 1024;
    private static final long GB = MB * 1024;

    public static String byteToReadable(long bytes) {
        if (bytes >= GB) {
            return String.format("%.2f GB", (float) bytes / GB);
        } else if (bytes >= MB) {
            return String.format("%.2f MB", (float) bytes / MB);
        } else if (bytes >= KB) {
            return String.format("%.2f KB", (float) bytes / KB);
        } else {
            return String.format("%d Bytes", bytes);
        }
    }

    public static long toByte(String size) {
        if (size == null || "".equals(size.trim())) {
            return 0;
        }
        size = size.toUpperCase(Locale.ENGLISH);
        String unit = "B";
        if (size.endsWith("KB")) {
            unit = "KB";
            size = size.substring(0, size.length() - 2).trim();
        } else if (size.endsWith("MB")) {
            unit = "MB";
            size = size.substring(0, size.length() - 2).trim();
        } else if (size.endsWith("GB")) {
            unit = "GB";
            size = size.substring(0, size.length() - 2).trim();
        } else if (size.endsWith("B")) {
            size = size.substring(0, size.length() - 1).trim();
        }
        double value = Double.parseDouble(size);
        if ("KB".equals(unit)) {
            value *= KB;
        } else if ("MB".equals(unit)) {
            value *= MB;
        } else if ("GB".equals(unit)) {
            value *= GB;
        }
        return (long) value;
    }
}

使用方法：

long sizeInBytes = ConvertUtils.toByte("1GB");
String readableSize = ConvertUtils.byteToReadable(sizeInBytes);
System.out.println(readableSize); //expected output: 1.00 GB

希望这个工具类能够帮到您。