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HomeJavajavaTutorialHow Can Apache Commons Simplify Byte Size Conversion to Human-Readable Format in Java?

How Can Apache Commons Simplify Byte Size Conversion to Human-Readable Format in Java?

Conversion of Byte Size to Human-Readable Format in Java

Converting byte size into a human-readable format is a common task that involves expressing values like 1024 bytes as "1 Kb" or 1024 * 1024 bytes as "1 Mb." While it is possible to write separate utility methods for this conversion, it can be tedious. Fortunately, Java provides a versatile way to accomplish this task.

Apache Commons Solution

Apache Commons offers methods that facilitate the conversion of byte size to human-readable formats. Among these methods are:

humanReadableByteCountSI(): Uses SI units (1 k = 1,000).

humanReadableByteCountBin(): Uses binary units (1 Ki = 1,024).

These methods accept a long value representing the byte size and return a human-readable string.

Example Implementation

import org.apache.commons.lang3.StringUtils;

public class ByteSizeConverter {

    public static String convertByteSizeToHumanReadableSI(long bytes) {
        return StringUtils.humanReadableByteCount(bytes, false);
    }

    public static String convertByteSizeToHumanReadableBinary(long bytes) {
        return StringUtils.humanReadableByteCount(bytes, true);
    }

}

Sample Output

Using the above methods, the sample outputs for different byte sizes are:

Byte Size (SI) Byte Size (Binary)
0 0 B
1024 1 kB
1048576 1 MiB
1073741824 1 GiB
1099511627776 1 TiB
9223372036854775807 8 EiB

Conclusion

The methods provided by Apache Commons offer a convenient and efficient way to convert byte sizes to human-readable formats. These methods can be easily integrated into existing Java projects, eliminating the need to write custom code for this common task.

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