Java to Jackson JSON serialization Money fields

Question

Currently  I m using Jackson to send out JSON results from my Spring-based web application   The problem I m having is trying to get all money fields to output with 2 decimal places  I wasn t able to solve this problem using setScale 2   as numbers like 25 50 are truncated to 25 5 etc  Has anyone else dealt with this problem  I was thinking about making a Money class with a custom Jackson serializer    can you make a custom serializer for a field variable  You probably can    But even still  how could I get my customer serializer to add the number as a number with 2 decimal places

User · Answer

As Sahil Chhabra suggested you can use  JsonFormat with proper shape on your variable  In case you would like to apply it on every BigDecimal field you have in your Dto s you can override default format for given class    Configuration public class JacksonObjectMapperConfiguration         Autowired     public void customize ObjectMapper objectMapper             objectMapper              configOverride BigDecimal class  setFormat JsonFormat Value forShape JsonFormat Shape STRING

User · Answer

Instead of setting the  JsonSerialize on each member or getter you can configure a module that use a custome serializer for a certain type   SimpleModule module   new SimpleModule    module addSerializer BigInteger class  new ToStringSerializer     objectMapper registerModule module     In the above example  I used the to string serializer to serialize BigIntegers  since javascript can not handle such numeric values

User · Answer

You can use a custom serializer at your money field  Here s an example with a MoneyBean  The field amount gets annotated with  JsonSerialize using        public class MoneyBean                   JsonProperty  amountOfMoney        JsonSerialize using   MoneySerializer class      private BigDecimal amount         getters setters       public class MoneySerializer extends JsonSerializer lt BigDecimal gt         Override     public void serialize BigDecimal value  JsonGenerator jgen  SerializerProvider provider  throws IOException              JsonProcessingException              put your desired money style here         jgen writeString value setScale 2  BigDecimal ROUND HALF UP  toString               That s it  A BigDecimal is now printed in the right way  I used a simple testcase to show it    Test public void jsonSerializationTest   throws Exception        MoneyBean m   new MoneyBean         m setAmount new BigDecimal  20 3           ObjectMapper mapper   new ObjectMapper         assertEquals     amountOfMoney     20 30      mapper writeValueAsString m

User · Answer

You can use  JsonFormat annotation with shape as STRING on your BigDecimal variables  Refer below    import com fasterxml jackson annotation JsonFormat     class YourObjectClass           JsonFormat shape JsonFormat Shape STRING        private BigDecimal yourVariable

User · Answer

I had the same issue and i had it formatted into JSON as a String instead  Might be a bit of a hack but it s easy to implement   private BigDecimal myValue   new BigDecimal  25 50        public String getMyValue         return myValue setScale 2  BigDecimal ROUND HALF UP  toString

User · Answer

Inspired by Steve  and as the updates for Java 11  Here s how we did the BigDecimal reformatting to avoid scientific notation  public class PriceSerializer extends JsonSerializer lt BigDecimal gt         Override     public void serialize BigDecimal value  JsonGenerator jgen  SerializerProvider provider  throws IOException              Using writNumber and removing toString make sure the output is number but not String          jgen writeNumber value setScale 2  RoundingMode HALF UP

User · Answer

I m one of the maintainers of jackson-datatype-money  so take this answer with a grain of salt since I m certainly biased  The module should cover your needs and it s pretty light-weight  no additional runtime dependencies   In addition it s mentioned in the Jackson docs  Spring docs and there were even some discussions already about how to integrate it into the official ecosystem of Jackson

[java] Java to Jackson JSON serialization: Money fields

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