From 0f60aa021a3d3a2a3623a208638e51d727f72edb Mon Sep 17 00:00:00 2001
From: TouyamaRie <yangshuo2077@foxmail.com>
Date: Fri, 28 Nov 2025 17:15:18 +0800
Subject: [PATCH] Fix issue 4169

---
 .../cn/hutool/core/text/split/SplitIter.java  | 39 +++++++++----------
 .../hutool/core/text/split/SplitIterTest.java | 16 ++++++++
 2 files changed, 35 insertions(+), 20 deletions(-)

diff --git a/hutool-core/src/main/java/cn/hutool/core/text/split/SplitIter.java b/hutool-core/src/main/java/cn/hutool/core/text/split/SplitIter.java
index b1cb444d95..f24760af43 100644
--- a/hutool-core/src/main/java/cn/hutool/core/text/split/SplitIter.java
+++ b/hutool-core/src/main/java/cn/hutool/core/text/split/SplitIter.java
@@ -71,29 +71,28 @@ public class SplitIter extends ComputeIter<String> implements Serializable {
 			return text.substring(offset);
 		}
 
-		final int start = finder.start(offset);
-		// 无分隔符，结束
-		if (start < 0) {
-			// 如果不再有分隔符，但是遗留了字符，则单独作为一个段
-			if (offset <= text.length()) {
-				final String result = text.substring(offset);
-				if (false == ignoreEmpty || false == result.isEmpty()) {
-					// 返回非空串
-					offset = Integer.MAX_VALUE;
-					return result;
+		String result = null;
+		int start;
+		do {
+			start = finder.start(offset);
+			// 无分隔符，结束
+			if (start < 0) {
+				// 如果不再有分隔符，但是遗留了字符，则单独作为一个段
+				if (offset <= text.length()) {
+					result = text.substring(offset);
+					if (!ignoreEmpty || !result.isEmpty()) {
+						// 返回非空串
+						offset = Integer.MAX_VALUE;
+						return result;
+					}
 				}
+				return null;
 			}
-			return null;
-		}
 
-		// 找到新的分隔符位置
-		final String result = text.substring(offset, start);
-		offset = finder.end(start);
-
-		if (ignoreEmpty && result.isEmpty()) {
-			// 发现空串且需要忽略时，跳过之
-			return computeNext();
-		}
+			// 找到新的分隔符位置
+			result = text.substring(offset, start);
+			offset = finder.end(start);
+		} while (ignoreEmpty && result.isEmpty()); // 空串则继续循环
 
 		count++;
 		return result;
diff --git a/hutool-core/src/test/java/cn/hutool/core/text/split/SplitIterTest.java b/hutool-core/src/test/java/cn/hutool/core/text/split/SplitIterTest.java
index 01ad2d157f..c82fae99f0 100644
--- a/hutool-core/src/test/java/cn/hutool/core/text/split/SplitIterTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/text/split/SplitIterTest.java
@@ -6,6 +6,8 @@ import cn.hutool.core.text.finder.PatternFinder;
 import cn.hutool.core.text.finder.StrFinder;
 import org.junit.jupiter.api.Test;
 
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.regex.Pattern;
 
@@ -153,4 +155,18 @@ public class SplitIterTest {
 			assertEquals(1, strings.size());
 		});
 	}
+
+	@Test
+	public void issue4169Test() {
+		StringBuilder sb = new StringBuilder();
+		for (int i = 0; i < 20000; i++) { // 1万次连续分隔符，模拟递归深度风险场景
+			sb.append(",");
+		}
+		sb.append("test");
+
+		SplitIter iter = new SplitIter(sb.toString(), new StrFinder(",",false), 0, true);
+		List<String> result = iter.toList(false);
+
+		assertEquals(Collections.singletonList("test"), result);
+	}
 }