参考java.util.concurrent.TimeUnit实现了一个FileSizeUnit工具包，与hutool中DataSize相比更加侧重于单位之间转换

2025-08-18 20:38:02 +08:00 · 2022-07-21 15:33:33 +08:00
parent 2a3686631d
commit 0ca9627663
2 changed files with 353 additions and 0 deletions
--- a/hutool-core/src/test/java/cn/hutool/core/io/unit/FileSizeUnitTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/io/unit/FileSizeUnitTest.java
@@ -0,0 +1,120 @@
+package cn.hutool.core.io.unit;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * 文件大小单位转换，方便于各种单位之间的转换
+ * @author zrh 455741807@qq.com
+ * @date 2022-07-21
+ */
+public class FileSizeUnitTest {
+	private static final long Byte = 1;
+	private static final long KB = 1024;
+	private static final long MB = (KB * KB);
+	private static final long GB = (KB * MB);
+	private static final long TB = (KB * GB);
+
+	@Test
+	public void toByte() {
+		long byteS = 123, kbS = 1, mbS = 1, gbS = 1, tbS = 1;
+
+		long byteT = FileSizeUnit.BYTE.toByte(byteS);
+		long kbT = FileSizeUnit.KB.toByte(kbS);
+		long mbT = FileSizeUnit.MB.toByte(mbS);
+		long gbT = FileSizeUnit.GB.toByte(gbS);
+		long tbT = FileSizeUnit.TB.toByte(tbS);
+
+		Assert.assertEquals(byteS, byteT);
+		Assert.assertEquals(kbS*(KB/Byte), kbT);
+		Assert.assertEquals(mbS*(MB/Byte), mbT);
+		Assert.assertEquals(gbS*(GB/Byte), gbT);
+		Assert.assertEquals(tbS*(TB/Byte), tbT);
+
+
+	}
+
+	@Test
+	public void toKB() {
+		long byteS = 1230, kbS = 456, mbS = 1, gbS = 1, tbS = 1;
+
+		long byteT = FileSizeUnit.BYTE.toKB(byteS);
+		long kbT = FileSizeUnit.KB.toKB(kbS);
+		long mbT = FileSizeUnit.MB.toKB(mbS);
+		long gbT = FileSizeUnit.GB.toKB(gbS);
+		long tbT = FileSizeUnit.TB.toKB(tbS);
+
+		Assert.assertEquals(byteS/(KB/Byte), byteT);
+		Assert.assertEquals(kbS, kbT);
+		Assert.assertEquals(mbS*(MB/KB), mbT);
+		Assert.assertEquals(gbS*(GB/KB), gbT);
+		Assert.assertEquals(tbS*(TB/KB), tbT);
+	}
+
+	@Test
+	public void toMB() {
+		long byteS = 1230000, kbS = 456000, mbS = 789, gbS = 1, tbS = 1;
+
+		long byteT = FileSizeUnit.BYTE.toMB(byteS);
+		long kbT = FileSizeUnit.KB.toMB(kbS);
+		long mbT = FileSizeUnit.MB.toMB(mbS);
+		long gbT = FileSizeUnit.GB.toMB(gbS);
+		long tbT = FileSizeUnit.TB.toMB(tbS);
+
+		Assert.assertEquals(byteS/(MB/Byte), byteT);
+		Assert.assertEquals(kbS/(MB/KB), kbT);
+		Assert.assertEquals(mbS, mbT);
+		Assert.assertEquals(gbS*(GB/MB), gbT);
+		Assert.assertEquals(tbS*(TB/MB), tbT);
+	}
+
+	@Test
+	public void toGB() {
+		long byteS = 1230000000, kbS = 456000000, mbS = 789000, gbS = 1, tbS = 1;
+
+		long byteT = FileSizeUnit.BYTE.toGB(byteS);
+		long kbT = FileSizeUnit.KB.toGB(kbS);
+		long mbT = FileSizeUnit.MB.toGB(mbS);
+		long gbT = FileSizeUnit.GB.toGB(gbS);
+		long tbT = FileSizeUnit.TB.toGB(tbS);
+
+		Assert.assertEquals(byteS/(GB/Byte), byteT);
+		Assert.assertEquals(kbS/(GB/KB), kbT);
+		Assert.assertEquals(mbS/(GB/MB), mbT);
+		Assert.assertEquals(gbS, gbT);
+		Assert.assertEquals(tbS*(TB/GB), tbT);
+
+	}
+
+	@Test
+	public void toTB() {
+		long byteS = 1230000000000L, kbS = 111000000000L, mbS = 789000000L, gbS = 1024, tbS = 1;
+
+		long byteT = FileSizeUnit.BYTE.toTB(byteS);
+		long kbT = FileSizeUnit.KB.toTB(kbS);
+		long mbT = FileSizeUnit.MB.toTB(mbS);
+		long gbT = FileSizeUnit.GB.toTB(gbS);
+		long tbT = FileSizeUnit.TB.toTB(tbS);
+
+		Assert.assertEquals(byteS/(TB/Byte), byteT);
+		Assert.assertEquals(kbS/(TB/KB), kbT);
+		Assert.assertEquals(mbS/(TB/MB), mbT);
+		Assert.assertEquals(gbS/(TB/GB), gbT);
+		Assert.assertEquals(tbS, tbT);
+	}
+
+	@Test
+	public void readableSizeStr1() {
+		long size = 1024*1024;
+		String sizeStr = FileSizeUnit.readableSizeStr(size);
+		Assert.assertEquals("1.0MB", sizeStr);
+	}
+
+	@Test
+	public void readableSizeStr2() {
+		long size = 123*1024;
+		String sizeStr = FileSizeUnit.readableSizeStr(size, FileSizeUnit.MB);
+		Assert.assertEquals("123.0GB", sizeStr);
+	}
+
+}