JavaGSON-序列化&;使用泛型类型列表反序列化类
示例类:JavaGSON-序列化&;使用泛型类型列表反序列化类,java,list,generics,gson,deserialization,Java,List,Generics,Gson,Deserialization,示例类: public class A { String Name; List<B> GenericsList; //Getters & Setters & Constructors } public class B { String Title; //Getters & Setters & Constructors } public class C extends B { String Somethi
public class A
{
String Name;
List<B> GenericsList;
//Getters & Setters & Constructors
}
public class B
{
String Title;
//Getters & Setters & Constructors
}
public class C extends B
{
String Something;
//Getters & Setters & Constructors
}
公共A类
{
字符串名;
列表泛型列表;
//getter、setter和constructor
}
公共B级
{
字符串标题;
//getter、setter和constructor
}
公共类C扩展到B
{
串东西;
//getter、setter和constructor
}
如果我像这样序列化类A的实例:
List<B> bList = new ArrayList<>();
C bObj = new C("name", "something text");
bList.add(bObj);
A aObj = new A("name", bList);
String serialized = new Gson.toJson(aObj);
A deserializedA = new Gson.fromJson(serialized);
Gson gson = new Gson();
List<B> bList = new ArrayList<>();
Type bType = new TypeToken<List<B>>() {}.getType();
gson.toJson(bList, bType);
gson.fromJson(json, bType);
Gson gson = new GsonBuilder()
.registerTypeHierarchyAdapter(B.class, new BGsonAdapter())
.setPrettyPrinting()
.create();
String serialized = gson.toJson(A);
A deserialized = (A)gson.fromJson(A);
List bList=new ArrayList();
C bObj=新的C(“名称”、“文本”);
bList.add(bObj);
A aObj=新的A(“名称”,bList);
String serialized=new Gson.toJson(aObj);
A反序列化da=new Gson.fromJson(序列化);
我丢失了列表中的C子类型。
我知道如何解决这个问题,如果它只是一个要序列化的列表,如下所示:
List<B> bList = new ArrayList<>();
C bObj = new C("name", "something text");
bList.add(bObj);
A aObj = new A("name", bList);
String serialized = new Gson.toJson(aObj);
A deserializedA = new Gson.fromJson(serialized);
Gson gson = new Gson();
List<B> bList = new ArrayList<>();
Type bType = new TypeToken<List<B>>() {}.getType();
gson.toJson(bList, bType);
gson.fromJson(json, bType);
Gson gson = new GsonBuilder()
.registerTypeHierarchyAdapter(B.class, new BGsonAdapter())
.setPrettyPrinting()
.create();
String serialized = gson.toJson(A);
A deserialized = (A)gson.fromJson(A);
Gson-Gson=new-Gson();
List bList=new ArrayList();
类型bType=newTypeToken(){}.getType();
toJson(bList,bType);
fromJson(json,bType);
问题是,我的泛型列表位于具有其他参数的对象内。我该怎么做
编辑1:
也许我不清楚具体的问题
当我序列化和反序列化上面创建的对象时,没有错误,而是得到以下结果:
对象A:
Name=“Name”
GenericsList={Object C}
我得到:
对象A:
Name=“Name”
GenericsList={Object B}
我丢失了子类型C的详细信息。明白了!谢谢你的提示Sotirios Delimanolis 必须为B类创建自定义实现:
class BGsonAdapter implements JsonSerializer<B>, JsonDeserializer<B>
{
public JsonElement serialize(B bObj, Type typeOfSrc, JsonSerializationContext context)
{
JsonObject result = new JsonObject();
result.add("Title", context.serialize(B.getTitle(), String.class));
if (bObj instanceof C)
{
result.add("Something", context.serialize(((C)bObj).getSomething(), String.class));
}
return result;
}
public B deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException
{
JsonObject object = json.getAsJsonObject();
B result = null;
if (object.has("Something"))
{
result = new C();
((C) result).setSomething((String)context.deserialize(object.get("Something"), String.class));
if (result == null)
{
result = new B();
}
result.setTitle(((String)context.deserialize(object.get("Title"), String.class)));
return result;
}
}
你能发布一个完整的例子和预期的结果吗?请详细说明你所看到的行为和你所问的问题。你应该阅读。没有帮助。问题是我想要反序列化的对象中有一个泛型类型列表。找不到任何具体的答案。。。。