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));
 	}