промежуточный. частичный рефакторинг с прицелом на библиотечную часть

src/Common/Utils/CommonUtils.java

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+package Common.Utils;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import org.apache.commons.io.FileUtils;
+
+import java.io.File;
+import java.nio.charset.Charset;
+public class CommonUtils {
+    public static Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().setPrettyPrinting().create();
+    /*
+    public static String jsonToPrettyFormat(String packed) {
+        JsonParser parser = new JsonParser();
+        JsonObject json = parser.parse(packed).getAsJsonObject();
+        Gson gson = new GsonBuilder().setPrettyPrinting().create();
+        return gson.toJson(json);
+    }
+     */
+    public static <T> T jsonFromFile(File file, Class<T> json_class) throws Exception {
+        return gson.fromJson(FileUtils.readFileToString(file, Charset.defaultCharset()), json_class);
+    }
+    public static void jsonToFile(Object json_object, File file) throws Exception {
+        FileUtils.writeStringToFile(file, gson.toJson(json_object));
+    }
+}