【CHG】修改验签数据转换方法

railway-common/src/main/java/com/railway/common/utils/JsonUtil.java

@@ -135,10 +135,14 @@ public class JsonUtil {
     if (object instanceof JSONObject) {
       JSONObject jsonObject = (JSONObject) object;
       for (Map.Entry<String, Object> entry : jsonObject.entrySet()) {
-        map.put(entry.getKey(), String.valueOf(entry.getValue()));
+        map.put(entry.getKey(), valueOf(entry.getValue()));
       }
     }
     return map;
   }
 
+  public static String valueOf(Object obj){
+    return (obj == null) ? "" : obj.toString();
+  }
+
 }