gson

问题 I'm parsing a JSON string by using Gson and Retrofit. I have this JSON string: {"message":["Email has already been taken"]} I get the below exception still and don't know why: java.io.EOFException: End of input at line 1 column 1 path $ at com.google.gson.stream.JsonReader.nextNonWhitespace(JsonReader.java:1393) at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:549) at com.google.gson.stream.JsonReader.peek(JsonReader.java:425) at com.google.gson.internal.bind

问题 I am not able to understand TypeToken of Google's GSON api's fromJson method. Below code is very complex to understand for me... Gson gson = new Gson(); ArrayList<ID_Name_Address> al = new ArrayList<ID_Name_Address>(); al = gson.fromJson(json, new TypeToken<List<ID_Name_Address>>(){}.getType()); What exactly is happening here : new TypeToken<List<ID_Name_Address>>(){}.getType() is this a anonymous class? Throw some light on this code. 回答1: TypeToken is a trick to obtain information about

问题 I'm trying to parse Json to Java by using Gson, but when I use fromJson(), I always get null. Who can explain this data structure for me? Thanks! { "d": { "results": [ { "__metadata": { "uri": "https://api.datamarket.azure.com/Data.ashx/Bing/SearchWeb/v1/Web?Query='bill'gates'&$skip=0&$top=1", "type": "WebResult" }, "ID": "9bd0942f-fe5b-44fc-8343-ef85e5b93a7e", "Title": "The Official Site of Bill Gates - The Gates Notes", "Description": "In the space between business and goverment, even a

问题 I'm using Gson successfully to place json into an object. It works like a charm on devices with android 2.2 (emulator and real device), when I deploy to android 4.0 and above (emulator and device) I get this very weird exception. I've confirmed that there is no problem with json string because the same code runs happily on older devices. The exception is definitely being thrown here: Gson gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();

问题 My class is like: class Foo { public String duration; public String height; } And my json data looks like {"duration":"12200000", "height":"162"} Now I want to deserialize it by Foo foo = gson.fromJson(jsonStr, Foo.class); So that, foo.duration is "20 mins" (number of minutes), foo.height is "162cm" Is this possible to do using Gson? Thanks! 回答1: GSON allows creation of custom deserializers/serializers. Try to read here. Sorry for without an example. class FooDeserializer implements

问题 I am new to GSON. I need to convert the following JSON response into a List. JSON response: { "data": [{ "data": { "ac_id": "000", "user_id": "000", "title": "AAA" } }, { "data": { "ac_id": "000", "user_id": "000", "title": "AAA" } }] } I have a class to cast data Account. java public class Account { public int ac_id; public int user_id; public String title; @Override public String toString(){ return "Account{"+ "ac_id="+ac_id+ ", user_id="+user_id+ ", title="+title+'}'; } } When I cast the

问题 I have used default HttpUrlConnection class to make api calls and GSON to convert Java Objects into json request and json response into equivalent Java object.I have created various models(pojo class) to convert the request/response to model objects.My doubt is that is it ideal to implement Serializable to all those models since GSON is serialization/deserialization library? public class Contact implements Serializable { private String name; private String email; public String getName() {

问题 I need to parse a response from the Flickr API. http://api.flickr.com/services/feeds/photos_public.gne?tagmode=any&format=json which returns a response in jsonFlickrFeed jQuery call back function (which is not a valid JSON response). I know we can remove JSON callback method for Flickr API using nojsoncallback=1 query. But is there any better approach to handle JSONP response if it is mandatory to use JSON with Padding (JSONP)? Instead of getting the response as a String, then trimming of the

问题 *I am getting error : com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 3* My Code: Gson gson = new Gson(); String[] placelist; placelist = gson.fromJson(result, String[].class); // Assign the String array as Country Spinner Control's items ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_dropdown_item_1line, placelist); spinnerFood.setAdapter(adapter); I am

问题 I was wondering something when working on our project. Does the GSON API from Google use the constructors from the JSON's you want to deserialize? So for example: I've got a JSON String which I want to convert to an Employee object. The Employee object has a constructor which applies some checks to the parameters (for example, is it's ID > 0). We're using the code below to deserialize the JSON's. But is this constructor even called when deserializing the JSON to Employee? Link to GSON: https: