42 lines
1.1 KiB
Java
42 lines
1.1 KiB
Java
package com.mini.capi.utils;
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import org.springframework.web.multipart.MultipartFile;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.nio.file.Files;
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public class vF {
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// 注意：起点是 KB，所以后面依次是 M、G、T、P
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private static final String[] UNITS = {"K", "M", "G", "T", "P"};
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private static final BigDecimal UNIT = BigDecimal.valueOf(1024L);
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public static String format(long kBytes) {
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if (kBytes < 0) {
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throw new IllegalArgumentException("KB 数不能为负数");
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}
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BigDecimal size = BigDecimal.valueOf(kBytes);
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int unitIndex = 0;
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while (size.compareTo(UNIT) >= 0 && unitIndex < UNITS.length - 1) {
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size = size.divide(UNIT, 2, RoundingMode.HALF_UP);
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unitIndex++;
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}
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// 去掉无意义的 0 和小数点
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String num = size.stripTrailingZeros().toPlainString();
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return num + UNITS[unitIndex];
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}
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}
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