调整项目模块，jodconverter-core重命名为office-plugin。jdocnverter-web重命名为server

server/src/main/java/cn/keking/service/FilePreview.java

@@ -0,0 +1,17 @@
+package cn.keking.service;
+
+import cn.keking.config.ConfigConstants;
+import cn.keking.model.FileAttribute;
+import org.springframework.ui.Model;
+
+/**
+ * Created by kl on 2018/1/17.
+ * Content :
+ */
+public interface FilePreview {
+
+    String TEXT_TYPE = "textType";
+    String DEFAULT_TEXT_TYPE = "simText";
+
+    String filePreviewHandle(String url, Model model, FileAttribute fileAttribute);
+}