मैंने GSON डिफॉल्ट DateTypeAdapter पर आधारित एक इम्प्रूवडटैप्ट टाइप एडेप्टर लिखा जो डिफ़ॉल्ट तिथियों के प्रारूप और टाइमस्टैम्प (लंबे) प्रारूप का समर्थन करता है ।
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
public final class ImprovedDateTypeAdapter extends TypeAdapter<Date> {
public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
@SuppressWarnings("unchecked")
TypeAdapter<T> typeAdapter = (TypeAdapter<T>) ((typeToken.getRawType() == Date.class) ? new ImprovedDateTypeAdapter()
: null);
return typeAdapter;
}
};
private final DateFormat enUsFormat;
private final DateFormat localFormat;
private final DateFormat iso8601Format;
public ImprovedDateTypeAdapter() {
this.enUsFormat = DateFormat.getDateTimeInstance(2, 2, Locale.US);
this.localFormat = DateFormat.getDateTimeInstance(2, 2);
this.iso8601Format = buildIso8601Format();
}
private static DateFormat buildIso8601Format() {
DateFormat iso8601Format = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
iso8601Format.setTimeZone(TimeZone.getTimeZone("UTC"));
return iso8601Format;
}
public Date read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return deserializeToDate(in.nextString());
}
private synchronized Date deserializeToDate(String json) {
try {
return new Date(Long.parseLong(json));
} catch (Exception e) {
try {
return this.localFormat.parse(json);
} catch (ParseException e1) {
try {
return this.enUsFormat.parse(json);
} catch (ParseException e2) {
try {
return this.iso8601Format.parse(json);
} catch (ParseException e3) {
throw new JsonSyntaxException(json, e3);
}
}
}
}
}
public synchronized void write(JsonWriter out, Date value)
throws IOException {
if (value == null) {
out.nullValue();
return;
}
String dateFormatAsString = this.enUsFormat.format(value);
out.value(dateFormatAsString);
}
}
इसके प्रयेाग के लिए:
GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(Date.class, new ImprovedDateTypeAdapter());
Gson gson = builder.create();