java – Gson：JsonSyntaxException on date

I tried to deserialize a JSON array using gson, but I'm getting a jsonsyntaxexception The JSON string is generated by using jsonresult Net mvc3 web service creation (meaning that I don't create JSON manually, it is created by a library that I know works on several other platforms)

This is JSON:

[{"PostID":1,"StudentID":39,"StudentName":"Joe Blow","Text":"Test message.","CreateDate":"\/Date(1350178408267)\/","ModDate":"\/Date(1350178408267)\/","CommentCount":0}]

This is the code:

public class Post {
   public int PostID;
   public int StudentID;
   public String StudentName;
   public String Text;
   public Date CreateDate;
   public Date ModDate;

   public Post() { }
}

Type listOfPosts = new TypeToken<ArrayList<Post>>(){}.getType();
ArrayList<Post> posts = new Gson().fromJson(json,listOfPosts);

Exception: invalid date format:

com.google.gson.JsonSyntaxException: /Date(1350178408267)/

Anyone knows what happened

Solution

I found an answer here, but I found it strange that there was no simpler way Several other JSON libraries I use are supported by themselves Net JSON format I was surprised when gson didn't deal with it There must be a better way If anyone knows, please post it here It's all like this. This is my solution:

I created a custom jsondeserializer and registered it as a date type By doing so, gson will use my deserializer as the date type instead of the default If you want to serialize / deserialize in a custom way, you can do the same for any other type

public class JsonDateDeserializer implements JsonDeserializer<Date> {
   public Date deserialize(JsonElement json,Type typeOfT,JsonDeserializationContext context) throws JsonParseException {
      String s = json.getAsJsonPrimitive().getAsString();
      long l = Long.parseLong(s.substring(6,s.length() - 2));
      Date d = new Date(l);
      return d; 
   } 
}

Then, when I create my gson object:

Gson gson = new GsonBuilder().registerTypeAdapter(Date.class,new JsonDateDeserializer()).create();

Now my gson object will be able to parse Net date format (millis since 1970)