package cn.org.rapid_framework.util;
import java.text.DecimalFormat;
/**
* @author badqiu
*/
public class FileSizeUtils {
public static long ONE_KB = 1024;
public static long ONE_MB = ONE_KB * 1024;
public static long ONE_GB = ONE_MB * 1024;
public static long ONE_TB = ONE_GB * (long)1024;
public static long ONE_PB = ONE_TB * (long)1024;
public static String getHumanReadableFileSize(Long fileSize) {
if(fileSize == null) return null;
return getHumanReadableFileSize(fileSize.longValue());
}
public static String getHumanReadableFileSize(long fileSize) {
if(fileSize < 0) {
return String.valueOf(fileSize);
}
String result = getHumanReadableFileSize(fileSize, ONE_PB, "PB");
if(result != null) {
return result;
}
result = getHumanReadableFileSize(fileSize, ONE_TB, "TB");
if(result != null) {
return result;
}
result = getHumanReadableFileSize(fileSize, ONE_GB, "GB");
if(result != null) {
return result;
}
result = getHumanReadableFileSize(fileSize, ONE_MB, "MB");
if(result != null) {
return result;
}
result = getHumanReadableFileSize(fileSize, ONE_KB, "KB");
if(result != null) {
return result;
}
return String.valueOf(fileSize)+"B";
}
private static String getHumanReadableFileSize(long fileSize, long unit,String unitName) {
if(fileSize == 0) return "0";
if(fileSize / unit >= 1) {
double value = fileSize / (double)unit;
DecimalFormat df = new DecimalFormat("######.##"+unitName);
return df.format(value);
}
return null;
}
}