I used to handle json in java, so when I was looking for a library, I was told how to use it: sunglasses:

What is Moshi

GitHub This is a library published by square on GitHub.

It parses JSON into classes, and conversely serializes classes into JSON. It's easy to use.

Usage

Gradle

compile 'com.squareup.moshi:moshi:1.5.0'

Just add

Parse

Create a class to parse


class PersonList {
    Map<String, Person> list;
}

class Person {
    int age;
    Sex sex;
}

enum Sex {
    MAN,
    WOMAN
}

Click here for the part to parse

String json = "xxxxxxx";

Moshi moshi = new Moshi.Builder().build();
JsonAdapter<PersonList> jsonAdapter = moshi.adapter(PersonList.class);

try {
    PersonList personList = jsonAdapter.fromJson(json);
} catch (Exception e) {
    Log.e("json parse error", "parsePersonList: ", e);
}

That's it (laughs)

Serialize

Click here for the serialize part

PersonList list = /*Create*/

Moshi moshi = new Moshi.Builder().build();
JsonAdapter<PersonList> jsonAdapter = moshi.adapter(PersonList.class);

try {
   String json = jsonAdapter.toJson(list);
} catch (Exception e) {
    Log.e("json serialize error", "serializePersonList: ", e);
}

Almost the same, but fromJson () and toJson () have changed

Caution

Please note that the classes that can be used are limited. ʻArrayList ・ HashMapetc. cannot be used, so let's useList ・ Map`

・ Primitives (int, float, char ...) and their boxed counterparts (Integer, Float, Character ...). ・ Arrays, Collections, Lists, Sets, and Maps ・ Strings ・ Enums

CustomAdapter

class PersonAdapter {
    @ToJson String toJson(Person person) {
      return String.valueOf(person.age) + sex.suit.name().substring(0, 1);
    }

    @FromJson Person fromJson(String json) {
        return //Parse String and create Person class
    }
}

I'm sorry I omitted the String parsing: sob:

By the way, another one

class ForthPerson {
    int forthAge;
    Sex sex;
}

If there is a class of people who are four times as old as ordinary people (laughs), it can be converted at the time of parse

class ForthPersonAdapter {
  @FromJson ForthPerson fromJson(Person person) {
    ForthPerson forthPerson = new ForthPerson();
    forthPerson.age = person.age * 4;
    forthPerson.sex = person.sex;
    return forthPerson;
  }

  @ToJson Person toJson(ForthPerson forthPerson) {
    Person person = new Person();
    person.age = forthPerson.age / 4;
    person.sex = forthPerson.sex;
    return person;
  }
}

Moshi moshi = new Moshi.builder()
        .add(new ForthPersonAdapter())
        .build();

You can use it now!

Get List

You can also get an array of classes

String json = "xxxxxxx";

Type type = Types.newParameterizedType(List.class, Person.class);
JsonAdapter<List<Person>> adapter = moshi.adapter(type);
List<Person> people = adapter.fromJson(json);

You can get an array of Person classes in people

[JAVA] Moshi ~ Json conversion library ~

What is Moshi