/**
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* Copyright (c) 2013-Now http://jeesite.com All rights reserved.
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*/
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package com.ruoyi.common.core.lang;
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/**
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* 字节转换工具
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* @author ThinkGem
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* @version 2015-6-20
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*/
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public class ByteUtils {
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private static final int UNIT = 1024;
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/**
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* @param byteSize 字节
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* @return
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*/
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public static String formatByteSize(long byteSize) {
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if (byteSize <= -1){
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return String.valueOf(byteSize);
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}
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double size = 1.0 * byteSize;
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String type = "B";
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if((int)Math.floor(size / UNIT) <= 0) { //不足1KB
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type = "B";
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return format(size, type);
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}
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size = size / UNIT;
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if((int)Math.floor(size / UNIT) <= 0) { //不足1MB
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type = "KB";
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return format(size, type);
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}
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size = size / UNIT;
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if((int)Math.floor(size / UNIT) <= 0) { //不足1GB
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type = "MB";
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return format(size, type);
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}
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size = size / UNIT;
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if((int)Math.floor(size / UNIT) <= 0) { //不足1TB
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type = "GB";
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return format(size, type);
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}
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size = size / UNIT;
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if((int)Math.floor(size / UNIT) <= 0) { //不足1PB
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type = "TB";
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return format(size, type);
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}
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size = size / UNIT;
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if((int)Math.floor(size / UNIT) <= 0) {
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type = "PB";
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return format(size, type);
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}
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return ">PB";
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}
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private static String format(double size, String type) {
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int precision = 0;
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if(size * 1000 % 10 > 0) {
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precision = 3;
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} else if(size * 100 % 10 > 0) {
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precision = 2;
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} else if(size * 10 % 10 > 0) {
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precision = 1;
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} else {
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precision = 0;
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}
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String formatStr = "%." + precision + "f";
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if("KB".equals(type)) {
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return String.format(formatStr, (size)) + "KB";
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} else if("MB".equals(type)) {
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return String.format(formatStr, (size)) + "MB";
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} else if("GB".equals(type)) {
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return String.format(formatStr, (size)) + "GB";
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} else if("TB".equals(type)) {
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return String.format(formatStr, (size)) + "TB";
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} else if("PB".equals(type)) {
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return String.format(formatStr, (size)) + "PB";
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}
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return String.format(formatStr, (size)) + "B";
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}
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}
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