和二进制单元）：

  public static String humanReadableByteCount（long bytes，boolean si）{
 int unit = 1000：1024; 
 if（bytes  int exp =（int）（Math.log（bytes）/ Math.log（unit））; 
 String pre =（si？kMGTPE：KMGTPE）。charAt（exp-1）+（si？：i）; 
 return String.format（％。1f％sB，bytes / Math.pow（unit，exp），pre）; 



 $ b示例输出：

 

 $ b  pre>  SI BINARY 

 0：0 B 0 B 
 27：27 B 27 B 
 999：999 B 999 B 
 1000：1.0 kB 1000 B 
 1023：1.0 kB 1023 B 
 1024：1.0 kB 1.0 KiB 
 1728：1.7 kB 1.7 KiB 
 110592：110.6 kB 108.0 KiB 
 7077888：7.1 MB 6.8 MiB 
 452984832：453.0 MB 432.0 MiB 
 28991029248：29.0 GB 27.0 GiB 
 1855425871872：1.9 TB 1.7 TiB 
 9223372036854775807：9.2 EB 8.0 EiB（Long。 MAX_VALUE）
 

相关文章：

How to convert byte size into human-readable format in Java? Like 1024 should become "1 Kb" and 1024*1024 should become "1 Mb".

I am kind of sick of writing this utility method for each project. Are there any static methods in Apache Commons for this?

Here is my go at it (no loops and handles both SI units and binary units):

public static String humanReadableByteCount(long bytes, boolean si) {
    int unit = si ? 1000 : 1024;
    if (bytes < unit) return bytes + " B";
    int exp = (int) (Math.log(bytes) / Math.log(unit));
    String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp-1) + (si ? "" : "i");
    return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
}

Example output:

                              SI     BINARY

                   0:        0 B        0 B
                  27:       27 B       27 B
                 999:      999 B      999 B
                1000:     1.0 kB     1000 B
                1023:     1.0 kB     1023 B
                1024:     1.0 kB    1.0 KiB
                1728:     1.7 kB    1.7 KiB
              110592:   110.6 kB  108.0 KiB
             7077888:     7.1 MB    6.8 MiB
           452984832:   453.0 MB  432.0 MiB
         28991029248:    29.0 GB   27.0 GiB
       1855425871872:     1.9 TB    1.7 TiB
 9223372036854775807:     9.2 EB    8.0 EiB   (Long.MAX_VALUE)

Related article: Java: Formatting byte size to human readable format