本文介紹了將文件大小格式化為 MB、GB 等的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
我需要使用合理的單位將文件大小顯示為字符串.
例如，
1L ==>1B"；1024L ==>1 KB"；2537253L ==>2.3 MB"等等
我發現 this previous answer，我覺得不滿意.
我想出了自己的解決方案，但也有類似的缺點:
private static final long K = 1024;私有靜態最終長 M = K * K；私有靜態最終長 G = M * K；私有靜態最終長 T = G * K；public static String convertToStringRepresentation(final long value){最終的 long[] 分隔符 = new long[] { T, G, M, K, 1 };final String[] units = new String[] { TB"、GB"、MB"、KB"、B"};如果(值 <1)throw new IllegalArgumentException("無效的文件大小:"+ value);字符串結果 = null;for(int i = 0; i 主要問題是我對 Decimalformat 和/或 String.format 的了解有限.我希望 1024L、1025L 等映射到 1 KB 而不是 1.0 KB.
所以，有兩種可能:
- 我更喜歡公共圖書館中的開箱即用解決方案，例如 Apache Commons 或 Google Guava.
- 如果沒有，我怎樣才能擺脫 '.0' 部分(不求助于字符串替換和正則表達式，我可以自己做)?
解決方案
public static String readableFileSize(long size) {如果(大小 <= 0)返回0"；最終字符串 [] 單位 = 新字符串 [] { "B", "kB", "MB", "GB", "TB" };int digitGroups = (int) (Math.log10(size)/Math.log10(1024));return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups)) + " " + units[digitGroups];}這將工作到 1000 TB....而且程序很短！
I need to display a file size as a string using sensible units.
For example,
1L ==> "1 B";
1024L ==> "1 KB";
2537253L ==> "2.3 MB"
etc.
I found this previous answer, which I didn't find satisfactory.
I have come up with my own solution which has similar shortcomings:
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 < 1)
throw new IllegalArgumentException("Invalid file size: " + value);
String result = null;
for(int i = 0; i < dividers.length; i++){
final long divider = dividers[i];
if(value >= 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 > 1 ? (double) value / (double) divider : (double) value;
return String.format("%.1f %s", Double.valueOf(result), unit);
}
The main problem is my limited knowledge of Decimalformat and / or String.format. I would like 1024L, 1025L, etc. to map to 1 KB rather than 1.0 KB.
So, two possibilities:
- I would prefer a good out-of-the-box solution in a public library like Apache Commons or Google Guava.
- If there isn't, how can I get rid of the '.0' part (without resorting to string replacement and regex, I can do that myself)?
解決方案
public static String readableFileSize(long size) {
if(size <= 0) return "0";
final String[] units = new String[] { "B", "kB", "MB", "GB", "TB" };
int digitGroups = (int) (Math.log10(size)/Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}
This will work up to 1000 TB.... and the program is short!
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