Gson? ???? ??? ?? ???

Gson? Java ??? JSON?? ???? ? ?? ???? Java ????????. Gson? ???? ??? ????? ? ?? ? ?? ??? ?? ?? ???? ?? ??????? ???? ???? ???? ????.

??

?? ??? OlixBaseObj ? OlixOp? ?? ?? ?? ???. ??? ??? ??(?: OlixOp? in ? out)? ????? Gson? ???? ??? ???? ??? JSON?? ????? ????.

GsonSerialization ?

<code class="java">ObixBaseObj lobbyObj = new ObixBaseObj();
lobbyObj.setIs("obix:Lobby");

ObixOp batchOp = new ObixOp();
batchOp.setName("batch");
batchOp.setIn("obix:BatchIn");
batchOp.setOut("obix:BatchOut");

lobbyObj.addChild(batchOp);

Gson gson = new Gson();
System.out.println(gson.toJson(lobbyObj));</code>

??

<code class="json">{"obix":"obj","is":"obix:Lobby","children":[{"obix":"op","name":"batch"}]}</code>

???? JSON?? ObixOp(in ? out)? ??? ??? ???? ????.

RuntimeTypeAdapterFactory ???

???? ???? ???? ?? Gson? RuntimeTypeAdapterFactory?? ??? ??? ?????. ? ???? ??? ? ????? ?? ?? ???? ?? ?? ???? ???? ?????.

??

<code class="java">RuntimeTypeAdapterFactory<ObixBaseObj> adapter = 
                    RuntimeTypeAdapterFactory
                   .of(ObixBaseObj.class)
                   .registerSubtype(ObixBaseObj.class)
                   .registerSubtype(ObixOp.class);


Gson gson2=new GsonBuilder().setPrettyPrinting().registerTypeAdapterFactory(adapter).create();
Gson gson = new Gson();
System.out.println(gson.toJson(lobbyObj));
System.out.println("---------------------");
System.out.println(gson2.toJson(lobbyObj));</code>

??

<code class="json">{"obix":"obj","is":"obix:Lobby","children":[{"obix":"op","name":"batch","children":[]}]}
---------------------
{
  "type": "ObixBaseObj",
  "obix": "obj",
  "is": "obix:Lobby",
  "children": [
    {
      "type": "ObixOp",
      "in": "obix:BatchIn",
      "out": "obix:BatchOut",
      "obix": "op",
      "name": "batch",
      "children": []
    }
  ]
}</code>

? ???? ?? ????? ??? ???? ???? ?? ???? ???? ??????.

?? ?? ??? ??

?? ???? ?? ?? ?? Gson? RuntimeTypeAdapter? ??? ????? ?????.

1. ?? ??? ?? ?? ??? ??? ???(?: GsonUtils):

<code class="java">public class GsonUtils {

    private static final GsonBuilder gsonBuilder = new GsonBuilder()
            .setPrettyPrinting();

    public static void registerType(
            RuntimeTypeAdapterFactory<?> adapter) {
        gsonBuilder.registerTypeAdapterFactory(adapter);
    }

    public static Gson getGson() {
        return gsonBuilder.create();
    }
}</code>

2. ?? ??? ?? ??? ??:

<code class="java">public class ObixBaseObj {

    private static final RuntimeTypeAdapterFactory<ObixBaseObj> adapter = 
            RuntimeTypeAdapterFactory.of(ObixBaseObj.class);

    static {
        GsonUtils.registerType(adapter);
    }

    private synchronized void registerClass() {
        if (!registeredClasses.contains(this.getClass())) {
            registeredClasses.add(this.getClass());
            adapter.registerSubtype(this.getClass());
        }
    }

    public ObixBaseObj() {
        registerClass();
        obix = "obj";
    }
}</code>

? ?? ??? ???? ?? ?? ???? GsonBuilder? ???? ???? ??? ????? ??????.

? ??? Gson? ???? ??? ??? ??? ????? JSON ???? ????? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!