From 4938242c9a2d1216b1610021dd2ac2b6a74c3f19 Mon Sep 17 00:00:00 2001
From: Looly <loolly@aliyun.com>
Date: Sun, 1 Feb 2026 19:36:08 +0800
Subject: [PATCH] =?UTF-8?q?`AppendableWriter`=E5=A2=9E=E5=8A=A0checkNotClo?=
 =?UTF-8?q?sed=EF=BC=88issue#IDMZ5K@Gitee=EF=BC=89?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/main/java/cn/hutool/v7/core/io/AppendableWriter.java    | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hutool-core/src/main/java/cn/hutool/v7/core/io/AppendableWriter.java b/hutool-core/src/main/java/cn/hutool/v7/core/io/AppendableWriter.java
index ed14755dbf..3868673d01 100644
--- a/hutool-core/src/main/java/cn/hutool/v7/core/io/AppendableWriter.java
+++ b/hutool-core/src/main/java/cn/hutool/v7/core/io/AppendableWriter.java
@@ -87,11 +87,13 @@ public class AppendableWriter extends Writer implements Appendable {
 
 	@Override
 	public void write(final String str) throws IOException {
+		checkNotClosed();
 		appendable.append(str);
 	}
 
 	@Override
 	public void write(final char[] cbuf) throws IOException {
+		checkNotClosed();
 		appendable.append(CharBuffer.wrap(cbuf));
 	}