Geschachteltes JSON-Objekt in Android analysieren

Beachten Sie, dass das Serialisieren / Deserialisieren von JSON zu / von Java-Objekten nicht "manuell" erfolgen muss. Bibliotheken wie GSON und Jackson mach es sehr einfach.

import java.text.DateFormat;
import java.util.Date;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class Foo
{
  static String jsonInput = 
    "{" + 
      "\"offer\":{" + 
        "\"category\":\"Salon\"," + 
        "\"description\":\"Use this offer now to enjoy this great Salon at a 20% discount. \"," + 
        "\"discount\":\"20\"," + 
        "\"expiration\":\"2011-04-08T02:30:00Z\"," + 
        "\"published\":\"2011-04-07T12:00:33Z\"," + 
        "\"rescinded_at\":null," + 
        "\"title\":\"20% off at Jun Hair Salon\"," + 
        "\"valid_from\":\"2011-04-07T12:00:31Z\"," + 
        "\"valid_to\":\"2011-04-08T02:00:00Z\"," + 
        "\"id\":\"JUN_HAIR_1302177631\"," + 
        "\"business\":{" + 
          "\"name\":\"Jun Hair Salon\"," + 
          "\"phone\":\"2126192989\"," + 
          "\"address\":{" + 
            "\"address_1\":\"12 Mott St\"," + 
            "\"address_2\":null," + 
            "\"city\":\"New York\"," + 
            "\"cross_streets\":\"Chatham Sq & Worth St\"," + 
            "\"state\":\"NY\"," + 
            "\"zip\":\"10013\"" + 
          "}" + 
        "}" + 
      "}" + 
    "}";

public static void main(String[] args) throws Exception
  {
    GsonBuilder gsonBuilder = new GsonBuilder();
    // gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
    gsonBuilder.setDateFormat(DateFormat.LONG);
    Gson gson = gsonBuilder.create();
    OfferContainer offerContainer = gson.fromJson(jsonInput, OfferContainer.class);
    System.out.println(offerContainer);
  }
}

class OfferContainer
{
  private Offer offer;

@Override
  public String toString()
  {
    return offer.toString();
  }
}

class Offer
{
  private Category category;
  private String description;
  private String discount;
  private Date expiration;
  private Date published;
  private String rescinded_at;
  private String title;
  private Date valid_from;
  private Date valid_to;
  private String id;
  private Business business;

@Override
  public String toString()
  {
    return String.format(
            "[Offer: category=%1$s, description=%2$s, discount=%3$s, expiration=%4$s, published=%5$s, rescinded_at=%6$s, title=%7$s, valid_from=%8$s, valid_to=%9$s, id=%10$s, business=%11$s]",
            category, description, discount, expiration, published, rescinded_at, title, valid_from, valid_to, id,
            business);
  }
}

enum Category
{
  Salon
}

class Business
{
  private String name;
  private String phone;
  private Address address;

@Override
  public String toString()
  {
    return String.format(
        "[Business: name=%1$s, phone=%2$s, address=%3$s]",
        name, phone, address);
  }
}

class Address
{
  private String address_1;
  private String address_2;
  private String city;
  private String cross_streets;
  private String state;
  private String zip;

@Override
  public String toString()
  {
    return String.format(
        "[Address: address_1=%1$s, address_2=%2$s, city=%3$s, cross_streets=%4$s, state=%5$s, zip=%6$s]",
        address_1, address_2, city, cross_streets, state, zip);
  }
}

Wenn die Leistung der JSON-Behandlung ein Problem darstellt, sehen Sie sich Jackson Vs. Gson und Ссылка