Java E/Scientific Notation在GET请求中丢失

Question

我有一个spring-boot应用程序，它返回一个包含双值(0.00010(的响应实体。由于它被映射到1.0E-4，我希望得到1.0E-4。相反，我得到0.00。GET请求的响应实体是否可能无法返回1.0E-4？

@GetMapping( path = "/ui/contract/XYZ/{contractNumber}", produces = { MediaType.APPLICATION_JSON_VALUE } )
@EndpointAuthorization( action = ViewContract.class )
public ResponseEntity<Contract> getXYZContract( @ValidContractNumber @PathVariable String contractNumber ) throws IOException {
return getContractResponseEntity( contractNumber );
}
private ResponseEntity<Contract> getContractResponseEntity( String contractNumber ) {
log.debug( "getContract( {} )", contractNumber );
var contract = contractService.getContract( restContext.getPermissionContext(), contractNumber );
if( contractService.hasAllActions( contract, Set.of( ViewContract.class, ViewCustomer.class ) ) ) {
accessLogService.saveAccessLog( restContext.getPersonId(), contract );
}
Contract mappedContract = ContractMapper.map( contract );
log.debug( "Return XYZ-Contract: {}", mappedContract );
return ResponseEntity.ok( mappedContract );
}

从HTTP获取请求我得到：

"calculateXYZPercent": 0.00,

但我希望它是：

"calculateXYZPercent": 1.0E-4,

return ResponseEntity.ok( mappedContract );行的断点表明，在那里，值仍然是1.0E-4。

提前谢谢大家！

Answer 1

问题是，自定义JsonSerializer将其映射到0.00

对于想要的领域做：

@JsonSerialize( using = TestSerializer.class)
Double test;

带有

public class TestSerializer extends JsonSerializer<Double> {
@Override
public void serialize( Double value, JsonGenerator gen, SerializerProvider serializers ) throws IOException {
gen.writeNumber( BigDecimal.valueOf( value ).setScale( 5, RoundingMode.HALF_UP ) );
}
}