diff --git a/plusone-basic/plusone-basic-infrastructure/src/main/java/xyz/zhouxy/plusone/oss/FastDFSUtil.java b/plusone-basic/plusone-basic-infrastructure/src/main/java/xyz/zhouxy/plusone/oss/FastDFSUtil.java
index 368f109..09640ca 100644
--- a/plusone-basic/plusone-basic-infrastructure/src/main/java/xyz/zhouxy/plusone/oss/FastDFSUtil.java
+++ b/plusone-basic/plusone-basic-infrastructure/src/main/java/xyz/zhouxy/plusone/oss/FastDFSUtil.java
@@ -26,6 +26,7 @@ import org.slf4j.LoggerFactory;
 import com.google.common.io.Files;
 
 import lombok.Getter;
+import xyz.zhouxy.plusone.commons.annotation.StaticFactoryMethod;
 import xyz.zhouxy.plusone.exception.SysException;
 
 public class FastDFSUtil {
@@ -149,21 +150,25 @@ public class FastDFSUtil {
         }
 
         @Nonnull
+        @StaticFactoryMethod(FastDFSFile.class)
         public static FastDFSFile of(@Nonnull File file) throws IOException {
             return new FastDFSFile(file, null);
         }
 
         @Nonnull
+        @StaticFactoryMethod(FastDFSFile.class)
         public static FastDFSFile of(@Nonnull File file, @Nullable String author) throws IOException {
             return new FastDFSFile(file, author);
         }
 
         @Nonnull
+        @StaticFactoryMethod(FastDFSFile.class)
         public static FastDFSFile of(@Nonnull String fileName, @Nonnull byte[] content) {
             return new FastDFSFile(fileName, content, null);
         }
 
         @Nonnull
+        @StaticFactoryMethod(FastDFSFile.class)
         public static FastDFSFile of(@Nonnull String fileName, @Nonnull byte[] content, @Nullable String author) {
             return new FastDFSFile(fileName, content, author);
         }