如果源和目标相同，如何将对象映射到对象

Question

我有

public class A {
    private String id;
    private Object filter;
}

我用数据构建对象 A

{
    "id":1,
    "filter" : {
      "ids":[1,2,3],
      "type": "1"
    }
}

之后

A b = mapper.map(a, A.class)

b.filter 为空。如何解决？

Answer 1

    MapperFactory build = new 
    DefaultMapperFactory.Builder().build();
    build.classMap(A.class, A.class)
            .customize(
                    new CustomMapper<>() {
                        @Override
                        public void mapAtoB(A source, A destination, MappingContext context) {
                            b.setFilter(a.getFilter());
                        }
                    }
            )
            .byDefault()
            .register();