问题

@JsonAdapter(WatusiTypeAdapter.class)
@Expose(serialize = false, deserialize = true)
private Watusi watusi;

如果存在TypeAdapter,则Expose注释似乎被忽略. WatusiTypeAdapter的write方法仍然被调用,但是@Expose(serialize = true)表示不应该这样.也许是您应该将该决定委托给TypeAdapter,但这会使类型适配器的可重用性大大降低.

问题

这是预期的行为还是错误？

解决方法:

javadoc of @Expose个州

This annotation has no effect unless you build com.google.gson.Gson
with a com.google.gson.GsonBuilder and invoke
com.google.gson.GsonBuilder.excludeFieldsWithoutExposeAnnotation()
method.

举个例子

public class Example {
    public static void main(String[] args) {
        Example example = new Example();
        example.other = new Other();

        Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
        System.out.println(gson.toJson(example));
    }

    @JsonAdapter(value = OtherAdapter.class)
    @Expose(serialize = true)
    private Other other;
}

class Other {
}

class OtherAdapter extends TypeAdapter<Other> {

    @Override
    public void write(JsonWriter out, Other value) throws IOException {
        System.out.println("hey");
        out.endObject();
    }

    @Override
    public Other read(JsonReader in) throws IOException {
        // TODO Auto-generated method stub
        return null;
    }
}

这将产生

{} 

换句话说,未调用写入.

这意味着您要公开的所有字段都必须使用@Expose进行注释.