/**
* 字节转换工具
* @author ThinkGem
* @version 2015-6-20
*/
public class ByteUtils {
private static final int UNIT = 1024;
/**
* @param byteSize 字节
* @return
*/
public static String formatByteSize(long byteSize) {
double size = 1.0 * byteSize;
String type = "B";
if((int)Math.floor(size / UNIT) <= 0) { //不足1KB
type = "B";
return format(size, type);
}
size = size / UNIT;
if((int)Math.floor(size / UNIT) <= 0) { //不足1MB
type = "KB";
return format(size, type);
}
size = size / UNIT;
if((int)Math.floor(size / UNIT) <= 0) { //不足1GB
type = "MB";
return format(size, type);
}
size = size / UNIT;
if((int)Math.floor(size / UNIT) <= 0) { //不足1TB
type = "GB";
return format(size, type);
}
size = size / UNIT;
if((int)Math.floor(size / UNIT) <= 0) { //不足1PB
type = "TB";
return format(size, type);
}
size = size / UNIT;
if((int)Math.floor(size / UNIT) <= 0) {
type = "PB";
return format(size, type);
}
return ">PB";
}
private static String format(double size, String type) {
int precision = 0;
if(size * 1000 % 10 > 0) {
precision = 3;
} else if(size * 100 % 10 > 0) {
precision = 2;
} else if(size * 10 % 10 > 0) {
precision = 1;
} else {
precision = 0;
}
String formatStr = "%." + precision + "f";
if("KB".equals(type)) {
return String.format(formatStr, (size)) + "KB";
} else if("MB".equals(type)) {
return String.format(formatStr, (size)) + "MB";
} else if("GB".equals(type)) {
return String.format(formatStr, (size)) + "GB";
} else if("TB".equals(type)) {
return String.format(formatStr, (size)) + "TB";
} else if("PB".equals(type)) {
return String.format(formatStr, (size)) + "PB";
}
return String.format(formatStr, (size)) + "B";
}
public static void main(String[] args) {
System.out.println(ByteUtils.formatByteSize(1023));
System.out.println(ByteUtils.formatByteSize(1L * UNIT));
System.out.println(ByteUtils.formatByteSize(1L * UNIT * UNIT));
System.out.println(ByteUtils.formatByteSize(1L * UNIT * 1023));
System.out.println(ByteUtils.formatByteSize(1L * 1023 * 1023 * 1023));
System.out.println(ByteUtils.formatByteSize(1L * UNIT * UNIT * UNIT));
System.out.println(ByteUtils.formatByteSize(1L * UNIT * UNIT * UNIT * UNIT));
System.out.println(ByteUtils.formatByteSize(1L * UNIT * UNIT * UNIT * UNIT * UNIT));
System.out.println(ByteUtils.formatByteSize(1L * UNIT * UNIT * UNIT * UNIT * UNIT * UNIT));
}
}
字节转换工具
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转载自blog.csdn.net/qq_31451081/article/details/81220429
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