GSON – 特定情况下的自定义序列化程序
我有这个架构:
public class Student { public String name; public School school; } public class School { public int id; public String name; } public class Data { public ArrayList students; public ArrayList schools; }
我想用Gson序列化Data对象,得到类似的东西:
{ "students": [{ "name":"name1", "school": "1" //the id of the scool, not its entire Json }], "school": [{ //the entire JSON "id" : "1", "name": "schoolName" }] }
为此,我必须为学生部分使用自定义序列化程序,以便Gson只打印学校的ID。 但是对于学校来说,我必须有正式的序列化器。
如何只用一个Gson对象做一切?
您可以编写这样的自定义序列化程序:
public class StudentAdapter implements JsonSerializer { @Override public JsonElement serialize(Student src, Type typeOfSrc, JsonSerializationContext context) { JsonObject obj = new JsonObject(); obj.addProperty("name", src.name); obj.addProperty("school", src.school.id); return obj; } }
当然,无论您要序列化此对象,都需要将其添加到Gson中,如下所示:
Gson gson = new GsonBuilder() .registerTypeAdapter(Student.class, new StudentAdapter()) .create(); return gson.toJson([YOUR_OBJECT_TO_BE_SERIALIZED]);