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src/main/java/com/lovenav/entity/Attachment.java

@@ -1,6 +1,7 @@
 package com.lovenav.entity;
 
 import java.io.Serializable;
+import java.util.Date;
 import lombok.Data;
 
 /**
@@ -57,7 +58,7 @@ public class Attachment implements Serializable {
     /**
      * 创建时间
      */
-    private Integer createtime;
+    private Date createtime;
 
     private static final long serialVersionUID = 1L;
 }