Gson字段特殊处理

public class GsonHelper {


    public static Gson buildGson() {
        return new GsonBuilder()
                .registerTypeAdapter(Integer.class, new IntegerDefault0Adapter())
                .registerTypeAdapter(int.class, new IntegerDefault0Adapter())
                .registerTypeAdapter(String.class, new StringAdapter())
                .create();
    }

    public static class IntegerDefault0Adapter implements JsonSerializer, JsonDeserializer {
        @Override
        public Integer deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
                throws JsonParseException {
            try {
                if (json.getAsString().equals("") || json.getAsString().equals("null")) {//定义为int类型,如果后台返回""或者null,则返回0
                    return 0;
                }
            } catch (Exception ignore) {
            }
            try {
                return json.getAsInt();
            } catch (NumberFormatException e) {
                throw new JsonSyntaxException(e);
            }
        }

        @Override
        public JsonElement serialize(Integer src, Type typeOfSrc, JsonSerializationContext context) {
            return new JsonPrimitive(src);
        }
    }

    public static class StringAdapter implements JsonDeserializer {

        @Override
        public String deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
            try {
                return json.getAsString();
            } catch (Exception e) {
                return null;
            }
        }
    }

}

public class GsonHelper {


    public static Gson buildGson() {
        return new GsonBuilder()
                .registerTypeAdapter(Integer.class, new IntegerDefault0Adapter())
                .registerTypeAdapter(int.class, new IntegerDefault0Adapter())
                .registerTypeAdapter(String.class, new StringAdapter())
                .create();
    }

    public static class IntegerDefault0Adapter implements JsonSerializer, JsonDeserializer {
        @Override
        public Integer deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
                throws JsonParseException {
            try {
                if (json.getAsString().equals("") || json.getAsString().equals("null")) {//定义为int类型,如果后台返回""或者null,则返回0
                    return 0;
                }
            } catch (Exception ignore) {
            }
            try {
                return json.getAsInt();
            } catch (NumberFormatException e) {
                throw new JsonSyntaxException(e);
            }
        }

        @Override
        public JsonElement serialize(Integer src, Type typeOfSrc, JsonSerializationContext context) {
            return new JsonPrimitive(src);
        }
    }

    public static class StringAdapter implements JsonDeserializer {

        @Override
        public String deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
            try {
                return json.getAsString();
            } catch (Exception e) {
                return null;
            }
        }
    }

}