支持FTP文件地址作为预览源url

jodconverter-web/pom.xml

@@ -147,6 +147,12 @@
             <artifactId>commons-cli</artifactId>
             <version>1.2</version>
         </dependency>
+        <!-- FTP -->
+        <dependency>
+            <groupId>commons-net</groupId>
+            <artifactId>commons-net</artifactId>
+            <version>3.6</version>
+        </dependency>
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>