用于DateTime的Gson自定义反序列化程序

import com.google.gson.*;

import java.lang.reflect.Type;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class DateTimeDeserializer implements JsonDeserializer<LocalDateTime> {
    private final DateTimeFormatter formatter;

    public DateTimeDeserializer(DateTimeFormatter formatter) {
        this.formatter = formatter;
    }

    @Override
    public LocalDateTime deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        String dateString = json.getAsString();
        return LocalDateTime.parse(dateString, formatter);
    }
}

import com.google.gson.*;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
    public static void main(String[] args) {
        GsonBuilder gsonBuilder = new GsonBuilder();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        gsonBuilder.registerTypeAdapter(LocalDateTime.class, new DateTimeDeserializer(formatter));
        Gson gson = gsonBuilder.create();

        String json = "{\"dateTime\":\"2022-12-31 23:59:59\"}";
        MyObject myObject = gson.fromJson(json, MyObject.class);

        System.out.println(myObject.getDateTime()); // 输出：2022-12-31T23:59:59
    }
}

class MyObject {
    private LocalDateTime dateTime;

    public LocalDateTime getDateTime() {
        return dateTime;
    }
}