Merge pull request #3026 from wulangcode/v5-dev

fix:CollUtil.split优化切割列表参数判断，避免OOM

CHANGELOG.md

@@ -8,7 +8,7 @@
 * 【core  】      SerializeUtil.deserialize增加白名单类，避免RCE vulnerability（issue#3021@Github）
 
 ### 🐞Bug修复
-
+* 【core  】      CollUtil.split优化切割列表参数判断，避免OOM
 -------------------------------------------------------------------------------------------------------------
 # 5.8.16 (2023-03-26)
 

hutool-core/src/main/java/cn/hutool/core/collection/CollUtil.java

@@ -371,7 +371,7 @@ public class CollUtil {
 				result.addAll(coll1);
 			}
 			result.removeAll(coll2);
-		} catch (UnsupportedOperationException e){
+		} catch (UnsupportedOperationException e) {
 			// 针对 coll1 为只读集合的补偿
 			result = CollUtil.create(AbstractCollection.class);
 			result.addAll(coll1);
@@ -1189,11 +1189,12 @@ public class CollUtil {
 			return result;
 		}
 
-		ArrayList<T> subList = new ArrayList<>(size);
+		final int initSize = Math.min(collection.size(), size);
+		List<T> subList = new ArrayList<>(initSize);
 		for (T t : collection) {
 			if (subList.size() >= size) {
 				result.add(subList);
-				subList = new ArrayList<>(size);
+				subList = new ArrayList<>(initSize);
 			}
 			subList.add(t);
 		}

hutool-core/src/test/java/cn/hutool/core/collection/CollUtilTest.java

@@ -255,6 +255,14 @@ public class CollUtilTest {
 		Assert.assertEquals(3, split.get(0).size());
 	}
 
+	@Test
+	public void splitTest2() {
+		final ArrayList<Integer> list = CollUtil.newArrayList(1, 2, 3, 4, 5, 6, 7, 8, 9);
+		final List<List<Integer>> split = CollUtil.split(list, Integer.MAX_VALUE);
+		Assert.assertEquals(1, split.size());
+		Assert.assertEquals(9, split.get(0).size());
+	}
+
 	@Test
 	public void foreachTest() {
 		final HashMap<String, String> map = MapUtil.newHashMap();