在Play中定制JSON序列化 [英] Customizing JSON serialization in Play

问题描述

我使用 renderJSON（Object）将一些对象作为JSON值返回，除了一个字段外，它工作正常。有没有一种简单的方法可以添加一个字段，而无需手动创建整个json模板？

Play使用GSON构建JSON字符串。如果您的一个字段是特定的对象类型，那么您可以通过为该类型提供自定义序列化来轻松完成此操作。请参阅此处的文档。

http://sites.google.com/site/gson/gson-user-guide#TOC-Custom-Serialization-and-Deserializ

但是，如果它是一个Integer类，例如，您想以一种方式工作，另一种方式用于另一种方式，那么您可能会遇到更多困难。

示例

  GsonBuilder gson = new GsonBuilder（）; 
 gson.registerTypeAdapter（SpecificClass.class，new MySerializer（））; 
 
 private class MySerializer实现了JsonSerializer< DateTime> {
 public JsonElement serialize（SpecificClass src，Type typeOfSrc，JsonSerializationContext context）{
 String res =specialClass的特殊格式
 return new JsonPrimitive（res）; 
} 
} 
  

I'm using renderJSON(Object) to return some objects as JSON values, and it's working fine except for one field. Is there an easy way to add in that one field without having to manually create the whole json template?

解决方案

Play uses GSON to build the JSON string. If your one field is a specific object type, then you can easily do this by providing a customised serialisation for that type. See the documentation here

http://sites.google.com/site/gson/gson-user-guide#TOC-Custom-Serialization-and-Deserializ

However, if it is an Integer class for example, that you want to work in one way for one, and another way for another, then you may have a little more difficulty.

Example

GsonBuilder gson = new GsonBuilder();
gson.registerTypeAdapter(SpecificClass.class, new MySerializer());

private class MySerializer implements JsonSerializer<DateTime> {
  public JsonElement serialize(SpecificClass src, Type typeOfSrc, JsonSerializationContext context) {
    String res = "special format of specificClass"
    return new JsonPrimitive(res);
  }
}

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