如何使用Jackson的布尔值的'has'方法命名约定？

Question

Jackson doesn't handle my boolean fields with a has getter method. For example animal.hasLegs() , for the legs field returns a JSON object without the legs field. It does work with the is getter method ( person.isAwesome() for the boolean field awesome ).

How can I make Jackson use the has method naming convention for boolean fields?

Answer 1

1. Annotate all needed hasXXX() methods with @JsonGetter . Otherwise Jackson doesn't use this property at all, because it doesn't start with get :

    @JsonGetter public boolean hasAwesome() { ... } 

2. Set custom PropertyNamingStrategy , which renames mapping from method name to JSON field. By default it will generate JSON field named hasXXX .

    ObjectMapper mapper = ... mapper.setPropertyNamingStrategy(new PropertyNamingStrategy() { @Override public String nameForGetterMethod(MapperConfig<?> config, AnnotatedMethod method, String defaultName) { String prefix = "has"; if (defaultName.startsWith(prefix)) { String withoutHas = defaultName.replace(prefix, ""); char firstLower = Character.toLowerCase(withoutHas.charAt(0)); return firstLower + withoutHas.substring(1); } return super.nameForGetterMethod(config, method, defaultName); } });