Java Jackson JsonNode 使用排序键进行字符串处理
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Hymanson JsonNode to string with sorted keys
提问by elhefe
I'm using Hymanson 2.2.3and need to convert a JsonNode tree into a string with sorted field keys. It's completely unclear to me how to do this, especially since the opposite is so simple - JsonNode jn = ObjectMapper.readTree(String s).
我正在使用Hymanson 2.2.3并且需要将 JsonNode 树转换为带有排序字段键的字符串。我完全不清楚如何做到这一点，特别是因为相反的事情非常简单 - JsonNode jn = ObjectMapper.readTree(String s).
It appears the correct method is void writeTree(JsonGenerator jgen,JsonNode rootNode). However, I see no way to then get the serialized Stringfrom the JsonGenerator. I presume that SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYSwill still apply, since the JsonGenerator.Features don't have that option. Is there a simpler way to do this - or if not, how do I retrieve the serialized string from the JsonGenerator?
看来正确的方法是void writeTree(JsonGenerator jgen,JsonNode rootNode)。但是，我认为没有办法String从JsonGenerator. 我认为这SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS仍然适用，因为JsonGenerator.Features 没有那个选项。有没有更简单的方法来做到这一点 - 或者如果没有，我如何从JsonGenerator?
采纳答案by elhefe
This is the easiest way to do it, as provided by one of Hymanson's authors. There's currently no way to go straight from JsonNodeto Stringwith sorted keys.
正如Hyman逊的一位作者所提供的那样，这是最简单的方法。目前没有办法使用排序的键直接从JsonNode到String。
private static final ObjectMapper SORTED_MAPPER = new ObjectMapper();
static {
SORTED_MAPPER.configure(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS, true);
}
private String convertNode(final JsonNode node) throws JsonProcessingException {
final Object obj = SORTED_MAPPER.treeToValue(node, Object.class);
final String json = SORTED_MAPPER.writeValueAsString(obj);
return json;
}
