Java数据单位转换

Java数据单位转换

Java 将byte数据量转换为带适合单位的值，Java9以上适用

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.regex.Pattern;

/**
 * Convert byte values to values with appropriate data units
 */
public class Conversion {
    private static final BigDecimal span = new BigDecimal(1024);
    
    public static final String maxLevelBytes = "1329227995784915872903807060280344576";
    
    private static final String[] units = {"B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB", "DB", "NB", "DB", "CB"};

    private static final Pattern NUMBER_PATTERN = Pattern.compile("-?\\d+(\\.\\d+)?");

    /**
     *
     * @param bytes Byte data volume of data
     * @return Value with appropriate data units
     */

    public static String UnitConversion(String bytes) {
        if (isNumeric2(bytes)){
            return "0B";
        }
        BigDecimal bigDecimal = new BigDecimal(bytes);
        if (bigDecimal.compareTo(BigDecimal.ZERO) <= 0) {
            return "0B";
        }
        BigDecimal level = new BigDecimal(maxLevelBytes);
        int i;
        for (i = units.length - 1; i >= 0; i--) {
            if (bigDecimal.compareTo(level) > 0) {
                break;
            }
            level = level.divide(span, 0, RoundingMode.DOWN);
        }
        return bigDecimal.divide(level, 2, RoundingMode.DOWN).toString() + units[i];
    }

    public static boolean isNumeric2(String str) {
        return str != null && NUMBER_PATTERN.matcher(str).matches();
    }
}

最后编辑时间：2023年10月4日22:13:23