➕ Adding a dependency.

spring-boot-demo-upload/pom.xml

@@ -38,6 +38,11 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+        </dependency>
     </dependencies>
 
     <build>