Gson和LocalDateTime那点儿事

Gson序列化与反序列化

Data obj= new Gson().fromJson(dataStr, Data.class);
String dataStr = new Gson().toJson(obj)

Gson日期格式化

Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create(); 

Gson注册序列化适配器

Gson gson = new GsonBuilder().registerTypeAdapter(LocalDateTime.class, new JsonSerializer() {
    @Override
    public JsonElement serialize(LocalDateTime src, Type typeOfSrc, JsonSerializationContext context) {
    return new JsonPrimitive(src.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
}}).registerTypeAdapter(LocalDate.class, new JsonSerializer() {
    @Override
    public JsonElement serialize(LocalDate src, Type typeOfSrc, JsonSerializationContext context) {
        return new JsonPrimitive(src.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
}).create();

Gson注册反序列化适配器

Gson gson = new GsonBuilder().registerTypeAdapter(LocalDateTime.class, new JsonDeserializer<LocalDateTime>() {
    @Override
    public LocalDateTime deserialize(JsonElement json, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
    String datetime = json.getAsJsonPrimitive().getAsString();
    return LocalDateTime.parse(datetime, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}}).registerTypeAdapter(LocalDate.class, new JsonDeserializer<LocalDate>() {
    @Override
    public LocalDate deserialize(JsonElement json, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
    String datetime = json.getAsJsonPrimitive().getAsString();
    return LocalDate.parse(datetime, DateTimeFormatter.ofPattern("yyyy-MM-dd"));}}).create();