感谢Eric的评论，使我指向了程序员，我设法破解了它。这是我使用的代码（为了简化而简化）。
public static class Info { @JsonProperty("Product") public String product; // Empty in the 0d version, One entry in the 1d version, two entries in the 2d version. @JsonProperty("Dimensions") public String[] dimensions;}public static class Info0d extends Info {}public static class Info1d extends Info { @JsonProperty("Labels") public String[] labels;}public static class Info2d extends Info { @JsonProperty("Labels") public String[][] labels;}public static class InfoDeserializer extends StdDeserializer<Info> { public InfoDeserializer() { super(Info.class); } @Override public Info deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException { Class<? extends Info> variantInfoClass = null; ObjectMapper mapper = (ObjectMapper) jp.getCodec(); ObjectNode root = (ObjectNode) mapper.readTree(jp); // Inspect the `diemnsions` field to decide what to expect. JsonNode dimensions = root.get("Dimensions"); if ( dimensions == null ) { variantInfoClass = Info0d.class; } else { switch ( dimensions.size() ) { case 1: variantInfoClass = Info1d.class; break; case 2: variantInfoClass = Info2d.class; break; } } if (variantInfoClass == null) { return null; } return mapper.readValue(root, variantInfoClass); }}并将其安装在
ObjectMapper：
// Register the special deserializer.InfoDeserializer deserializer = new InfoDeserializer();SimpleModule module = new SimpleModule("PolymorphicInfoDeserializerModule", new Version(1, 0, 0, null));module.addDeserializer(Info.class, deserializer);mapper.registerModule(module);factory = new JsonFactory(mapper);
