GSON中的自定义反序列化？

我需要创建一个自定义反序列化器，以便我能够正确地反序列化我以这种格式收到的日期： 2011-10-19T23:30:00-04:00 。 我的Date对象是许多字段之一，包含我正在反序列化的Object的许多嵌套类之一。 除了Date之外，一切正常。 我的class级看起来像这样：

 public class OfferContainer{ public Offer offer; public OfferContainer(){} @Override public String toString() { return this.getID() + offer.toString(); } public String getDescription() { return offer.description; } public String getBusinessName() { return offer.business.name; } public class Offer { public Category category; public String description; public String discount; public Date expiration; public Date published; public String rescinded_at; public String title; public String hook; public Date valid_from; public Date valid_to; public String id; public Business business; public Location location; public String image_270x155; @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$s, location=%12$s]", category, description, discount, expiration, published, rescinded_at, title, valid_from, valid_to, id, business, location); } } public enum Category { Salon, Spa, Restaurant, Other } public class Business { public String name; public String phone; public Address address; @Override public String toString() { return String.format( "[Business: name=%1$s, phone=%2$s, address=%3$s]", name, phone, address); } } public class Address { public String address_1; public String address_2; public String city; public String cross_streets; public String state; public String zip; @Override public String toString() { return String.format( "[Address: address_1=%1$s, address_2=%2$s, city=%3$s, cross_streets=%4$s, state=%5$s, zip=%6$s]", address_1, address_2, city, cross_streets, state, zip); } } public class Location { public double latitude; public double longitude; public String toString() { return String.format("[Location: longitude=%1$s, latitude=%2$s]", longitude, latitude); } } } 

如何在此场景中使用registerTypeAdapter以及如何为此正确实现自定义反序列化器？

提前致谢！

此外，如果重要的话，这就是我实际上如何得到我的POJO：

  OfferContainer[] offers = gson.fromJson(json, OfferContainer[].class); 

这是JSON：

 { "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" } }, "location":{ "latitude":"40.714021", "longitude":"-73.998663" }, "distance":619.8162766744034, "draws":[ "Hair Cut", "Blow Dry", "Blow Dry Treatment" ], "claim_link":"http://ms.com/offers/JUN_HAIR_1302177631?app_id=SavIMg", "mobile_claim_link":"http://ms.com/offers/JUN_HAIR_1302177631?app_id=SavIMg" } } 

Answer 1

您需要实现JSONDeserializer ，然后重写JSONDeserializer方法来实现此目的。 看看这个SO问题GSON反序列化自定义对象的键值

您也可以尝试在GsonBuilder设置dateformat

  Gson gson = new GsonBuilder() .setDateFormat("yyyy-MM-dd'T'HHmmss.SSS'Z'") .create(); OfferContainer [] offers = gson.fromJson(json, OfferContainer[].class);