diff --git a/infra/common/src/test/java/cn/hippo4j/common/toolkit/IoUtilTest.java b/infra/common/src/test/java/cn/hippo4j/common/toolkit/IoUtilTest.java
index b0975a84..7daf0d47 100644
--- a/infra/common/src/test/java/cn/hippo4j/common/toolkit/IoUtilTest.java
+++ b/infra/common/src/test/java/cn/hippo4j/common/toolkit/IoUtilTest.java
@@ -24,7 +24,20 @@ import org.junit.Before;
 import org.junit.Test;
 import org.junit.jupiter.api.Assertions;
 import org.springframework.core.io.ClassPathResource;
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.PrintWriter;
+import java.io.Reader;
+import java.io.Writer;
+import java.io.File;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.io.Closeable;
+import java.io.FileReader;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ByteArrayInputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.nio.file.Files;