java - Java 日历的序列化

Question

如何通过扩展 json serializer<Calendar> 为 java Calendar 创建自定义序列化到 json ？

我对 java.until.Date 做了同样的尝试它正在工作。在序列化方法中，我将Date转成String，写成json格式。

为 java.util.Date 完成的示例代码类似于下面给出的代码

  public class CDJsonDateSerializer extends JsonSerializer<Date>{
  @Override
  public void serialize(Date date, JsonGenerator jsonGenerator,SerializerProvider provider)
 throws IOException {

      SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
      String dateString = dateFormat.format(date);
     jsonGenerator.writeString(dateString);
 }
}

它是这样使用的:

 @JsonSerialize(using = CDJsonDateSerializer.class)
 private Date startDate;

如何在不丢失 Calendar 对象数据的情况下将 java 中的 Calendar 序列化为 json？

Answer 1

从 JSON 到 Calendar

创建一个 JsonSerializer :

public class CalendarSerializer extends JsonSerializer<Calendar> {

    private SimpleDateFormat formatter = new SimpleDateFormat("MM/dd/yyyy");

    @Override
    public void serialize(Calendar calendar, JsonGenerator jsonGenerator,
                          SerializerProvider serializerProvider) throws IOException {

        String dateAsString = formatter.format(calendar.getTime());
        jsonGenerator.writeString(dateAsString);

    }
}

然后使用它:

@JsonSerialize(using = CalendarSerializer.class)
private Calendar calendar;

来自Calendar到 JSON

创建一个 JsonDeserializer :

public class CalendarDeserializer extends JsonDeserializer<Calendar> {

    private SimpleDateFormat formatter = new SimpleDateFormat("MM/dd/yyyy");

    @Override
    public Calendar deserialize(JsonParser jsonParser,
                                DeserializationContext deserializationContext) 
                                throws IOException {

        String dateAsString = jsonParser.getText();

        try {
            Date date = formatter.parse(dateAsString);
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            return calendar;
        } catch (Exception e) {
            throw new IOException(e);
        }
    }

然后使用它:

@JsonDeserialize(using = CalendarDeserializer.class)
private Calendar calendar;