Gson定制解串器就在现场

Question

我和Gson一起使用Volley.我有一个人物,我想设置性别,不是字符串,而是枚举.所以我想为这个领域编写一个自定义反序列化器,让Gson完成其余的工作.我怎样才能做到这一点？

Answer 1

以下是带有示例调用的自定义反序列化(针对性别)的代码.

1)性别解串器不区分大小写

2)处理的值无效(即输入json不包含男性和女性)

主要方法: -

public static void main(String[] args) {
        String jsonString = "{'firstName' : 'john','lastName' : 'stones','gender' : 'male'}";
        Gson gson = new GsonBuilder()
                .registerTypeAdapter(Person.class, new PersonModelDeserializer())
                .create();

        Person person = gson.fromJson(jsonString, Person.class);
        System.out.println(person.toString());

    }

性别枚举: -

public enum Gender {
    MALE, FEMALE
}

解串器: -

如果输入json没有男性或女性,则该valueOf方法抛出IllegalArgumentException ,该IllegalArgumentException也已被处理.

性别反序列化也不区分大小写.

public class PersonModelDeserializer implements JsonDeserializer<Person> {

    @Override
    public Person deserialize(JsonElement paramJsonElement, Type paramType,
            JsonDeserializationContext paramJsonDeserializationContext) throws JsonParseException {

        Person person = new Gson().fromJson(paramJsonElement.getAsJsonObject(), Person.class);

        try {
            Gender gender = null;
            if (paramJsonElement.getAsJsonObject().get("gender") != null) {
                gender = Gender.valueOf(paramJsonElement.getAsJsonObject().get("gender").getAsString().toUpperCase());
            }

            person.setGender(gender);
        } catch (IllegalArgumentException ie) {
            System.out.println(ie.getMessage());
            System.out.println("Gender cannot be serialized ..");
        }

        return person;
    }

}

人员类: -

public class Person implements Serializable{
    private static final long serialVersionUID = 5447375194275313051L;

    private String firstName;
    private String lastName;

    private Gender gender;

    ... getters and setters
}