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POFormat file size as MB, GB etc
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  1. POFormat file size as MB, GB etc
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    copied!<p>I need to display a file size as String using sensible units.</p> <p>e.g.</p> <pre><code>1L ==&gt; "1 B"; 1024L ==&gt; "1 KB"; 2537253L ==&gt; "2.3 MB" </code></pre> <p>etc.</p> <p>I found <a href="https://stackoverflow.com/questions/801935/formatting-file-sizes-in-java-jstl">this previous answer</a>, which I didn't find satisfactory</p> <p>I have come up with my own solution which has similar shortcomings:</p> <pre><code>private static final long K = 1024; private static final long M = K * K; private static final long G = M * K; private static final long T = G * K; public static String convertToStringRepresentation(final long value){ final long[] dividers = new long[] { T, G, M, K, 1 }; final String[] units = new String[] { "TB", "GB", "MB", "KB", "B" }; if(value &lt; 1) throw new IllegalArgumentException("Invalid file size: " + value); String result = null; for(int i = 0; i &lt; dividers.length; i++){ final long divider = dividers[i]; if(value &gt;= divider){ result = format(value, divider, units[i]); break; } } return result; } private static String format(final long value, final long divider, final String unit){ final double result = divider &gt; 1 ? (double) value / (double) divider : (double) value; return String.format("%.1f %s", Double.valueOf(result), unit); } </code></pre> <p>The main problem is my limited knowledge of Decimalformat and / or String.format. I would like 1024L, 1025L etc to map to <code>1 KB</code> rather than <code>1.0 KB</code>.</p> <p>So, two possibilities:</p> <ol> <li>I would prefer a good out-of-the-box solution in a public library like apache commons or google guava.</li> <li>If there isn't, can someone show me how to get rid of the '.0' part (without resorting to string replacement and regex, I can do that myself)</li> </ol>
 

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