From e354ea93cc98a0d05ac921191ee24bc976c61223 Mon Sep 17 00:00:00 2001
From: Looly <loolly@aliyun.com>
Date: Sun, 9 Oct 2022 18:37:21 +0800
Subject: [PATCH] fix doc

---
 .../main/java/cn/hutool/core/io/file/FileNameUtil.java    | 8 ++++++++
 .../java/cn/hutool/core/io/file/FileNameUtilTest.java     | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/hutool-core/src/main/java/cn/hutool/core/io/file/FileNameUtil.java b/hutool-core/src/main/java/cn/hutool/core/io/file/FileNameUtil.java
index 587ca2c9e..f5a32b1c5 100755
--- a/hutool-core/src/main/java/cn/hutool/core/io/file/FileNameUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/io/file/FileNameUtil.java
@@ -174,6 +174,14 @@ public class FileNameUtil {
 		if (0 == len) {
 			return fileName;
 		}
+
+		//issue#2642，多级扩展名的主文件名
+		for (final CharSequence specialSuffix : SPECIAL_SUFFIX) {
+			if(StrUtil.endWith(fileName, "." + specialSuffix)){
+				return StrUtil.subPre(fileName, len - specialSuffix.length() - 1);
+			}
+		}
+
 		if (CharUtil.isFileSeparator(fileName.charAt(len - 1))) {
 			len--;
 		}
diff --git a/hutool-core/src/test/java/cn/hutool/core/io/file/FileNameUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/io/file/FileNameUtilTest.java
index 2d254b4d8..915431766 100755
--- a/hutool-core/src/test/java/cn/hutool/core/io/file/FileNameUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/io/file/FileNameUtilTest.java
@@ -13,4 +13,10 @@ public class FileNameUtilTest {
 		name = FileNameUtil.cleanInvalid("\r1\r\n2\n");
 		Assert.assertEquals("12", name);
 	}
+
+	@Test
+	public void mainNameTest() {
+		final String s = FileNameUtil.mainName("abc.tar.gz");
+		Assert.assertEquals("abc", s);
+	}
 }