您可以子類JsonWriter
並覆蓋writeXXX
方法。例如,自定義日期序列化,你可以使用:
class CustomJsonWriter extends JsonWriter {
public CustomJsonWriter(Writer writer) {
super(writer);
}
public CustomJsonWriter(Writer writer, JsonWriterSettings settings) {
super(writer, settings);
}
@Override
protected void doWriteDateTime(long value) {
doWriteString(DateTimeFormatter.ISO_DATE_TIME
.withZone(ZoneId.of("Z"))
.format(Instant.ofEpochMilli(value)));
}
}
然後你可以使用重載版本的方法:
public static String toJson(Document doc) {
CustomJsonWriter writer = new CustomJsonWriter(new StringWriter(), new JsonWriterSettings());
DocumentCodec encoder = new DocumentCodec();
encoder.encode(writer, doc, EncoderContext.builder().isEncodingCollectibleDocument(true).build());
return writer.getWriter().toString();
}