Deserialize from Long to Date

[James]

Hi guys,

I have a Date member of a POJO and the json string I am deserializing
contains the Date represented as a long. At the moment I am getting
the error: java.text.ParseException: Unparseable date:
"1236918168000".

I have created a Date Deserializer and registered it as Type Adapter
but it seems to never get called.

[Ran Berenfeld]

I am able to serialize longs to dates and vice verca in my web page www.ichess.co.il application

here is my custom deserializing: and serializing :

builder.registerTypeAdapter(java.util.Date.class, new JsonSerializer<java.util.Date>() {

@Override

public JsonElement serialize(java.util.Date src, Type typeOfSrc, JsonSerializationContext context) {

Utils.debug("serializing : " + src);

return new JsonPrimitive(src.getTime());

}

});

builder.registerTypeAdapter(java.util.Date.class, new JsonDeserializer<java.util.Date>() {

@Override

public java.util.Date deserialize(com.google.gson.JsonElement p1, java.lang.reflect.Type p2,

com.google.gson.JsonDeserializationContext p3) {

Utils.debug("deserializing : " + p1);

return new java.util.Date(p1.getAsLong());

}

});

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[James]

Hi Ran, thanks for the reply. I registered the Date deserializer
exactly the same same way (but I did not use an anonymous inner
class). I placed a break point on the deserialize method and it was
never called. I will get a snippet, but its pretty much exactly the
same.

On May 11, 2:30 pm, Ran Berenfeld <berenfeld...@gmail.com> wrote:
> I am able to serialize longs to dates and vice verca in my web pagewww.ichess.co.ilapplication
> here is my custom deserializing: and serializing :
>
> builder.registerTypeAdapter(java.util.Date.class, new
> JsonSerializer<java.util.Date>() {
> @Override
> public JsonElement serialize(java.util.Date src, Type typeOfSrc,
> JsonSerializationContext context) {
> Utils.debug("serializing : " + src);
> return new JsonPrimitive(src.getTime());
>
> }
> });
>
> builder.registerTypeAdapter(java.util.Date.class, new
> JsonDeserializer<java.util.Date>() {
> @Override
> public java.util.Date deserialize(com.google.gson.JsonElement p1,
> java.lang.reflect.Type p2,
> com.google.gson.JsonDeserializationContext p3) {
> Utils.debug("deserializing : " + p1);
> return new java.util.Date(p1.getAsLong());
>
>
>
>
>
>
>
> }
> });

[Ran Berenfeld]

James

well just to be sure - when the data is send from the javascript to the server, the date have to be changed

to long using getTime() function, right ?

[James]

This is to deserialize a json response from the web server. The Date
object on the server is transformed into its json representation using
getTime() yes and then sent out to the client.

[inde...@gmail.com]

In the Type that you are deserializing into, do you have a subclass of Date? If so, your date deserializer will not get called as it is registered to handle for Date.class only. 

To fix this, you should use the Gson 1.7.1 method, registerTypeHierarchyAdapter.