JSON解码错误:无法反序列化类型' java.math '的值.BigInteger ' from Object va

Question

需要将Mono<ResultSumDto>的结果反序列化为JSON，然后作为JSON发送给客户端。

控制器

@GetMapping("v1/sequence/{startRange}/{endRange}")
Mono<ResultSumDto > getSumFromRange(
@PathVariable BigInteger startRange,
@PathVariable BigInteger endRange) {
ResultSumDto resultSumDto = ...
return Mono.just(resultSumDto);
}

@Configuration
public class JacksonObjectMapperConfiguration {
@Autowired
public void serializeBigInteger(ObjectMapper objectMapper) {
JsonFormat.Value formatValue =
JsonFormat.Value.forShape(JsonFormat.Shape.STRING);
objectMapper
.configOverride(BigInteger.class)
.setFormat(formatValue);
}
}

@Data
@Builder
public class ResultSumDto {
private final BigInteger sumSeq;
private final BigInteger [] seqRange;
private final Boolean isCached;
}

private Mono<ResultSumDto> buildResult(SeqDto dto) {
Mono<BigInteger> sumSeq =
calculateSumRangeValuesFibonacciSequence(dto);
BigInteger bigInteger = null;
try {
bigInteger = sumSeq
.toFuture()
.get();
} catch (InterruptedException | ExecutionException e) {
log.error(e.getLocalizedMessage());
Thread.currentThread().interrupt();
}

BigInteger[] rangeGiven = new BigInteger[]
{dto.getStartRange(), dto.getEndRange()};
return Mono.just(ResultSumSeqDto.builder()
.sumSequence(bigInteger)
.sequenceRange(rangeGiven)
.isCached(false)
.build()
);
}

但是我有一个错误:

org.springframework.core.codec。DecodingException: JSON解码错误:不能从对象值(tokenJsonToken.START_OBJECT)中反序列化类型为java.math.BigInteger的值;嵌套异常是com.fasterxml. jacksondatabind.exc.mismatchedinputexception:无法从对象值(令牌JsonToken.START_OBJECT)中反序列化类型java.math.BigInteger的值[来源:[io.netty.buffer.ByteBufInputStream];行:1，列:1]

但是，毕竟，当我在端点中获取值时，对BigInteger类型的序列化没有问题。

谁知道为什么它不起作用以及如何修复它。分享一下你关于如何反序列化一个BigInteger数组和一个BigInteger类型的字段的知识?

Answer 1

我就是这么做的。

public class DeserializeResultCalculateSumSequence
extends StdDeserializer<ResultCalculateSumSequenceDto> {
public DeserializeResultCalculateSumSequence() {
this(null);
}
protected DeserializeResultCalculateSumSequence(Class<?> vc) {
super(vc);
}
@Override
public ResultCalculateSumSequenceDto deserialize(JsonParser jsonParser,
DeserializationContext deserializationContext)
throws IOException, JacksonException {
JsonNode node = jsonParser
.getCodec()
.readTree(jsonParser);
BigInteger sumSequence = node
.get("sumSequence")
.bigIntegerValue();
ObjectMapper mapper = new ObjectMapper();
String sequenceRangeStr = node.get("sequenceRange").toString();
BigInteger[] sequenceRange = mapper
.readValue(sequenceRangeStr, BigInteger[].class);

boolean isCached = node
.get("isCached")
.asBoolean();
return ResultCalculateSumSequenceDto
.builder()
.sumSequence(sumSequence)
.sequenceRange(sequenceRange)
.isCached(isCached)
.build();
}
}

@Data
@Builder
@JsonDeserialize(using = DeserializeResultCalculateSumSequence.class)
public class ResultCalculateSumSequenceDto {
private final BigInteger sumSequence;
private final BigInteger [] sequenceRange;
private final Boolean isCached;
}