How Can I Convert Bytes to Human-Readable Format in Java?

Convert Byte Size to Human-Readable Format in Java

Problem:

Converting byte size into a human-readable format, such as "1 Kb" or "1 Mb," is a common requirement. Instead of manually writing this utility in each project, exploring existing libraries for such functionality is desirable.

Solution:

Apache Commons

Apache Commons provides two static methods for converting byte size to a human-readable format:

• humanReadableByteCountSI(): Uses the International System of Units (SI) convention, where 1000 units of a smaller size equal one unit of a larger size.
• humanReadableByteCountBin(): Uses the binary convention, where 1024 units of a smaller size equal one unit of a larger size.

Implementation:

public static String humanReadableByteCountSI(long bytes) {
  // ... code from Apache Commons
}

public static String humanReadableByteCountBin(long bytes) {
  // ... code from Apache Commons
}

Example:

System.out.println(humanReadableByteCountSI(1024)); // output: "1.0 kB"
System.out.println(humanReadableByteCountBin(1024)); // output: "1.0 KiB"

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