java - DozerBeanMapper : Ignore Null values from Source

Question

在我的 Java 项目中，我使用 org.dozer.BeanMapper 将复杂的源对象合并到具有相同类型的目标对象中:

sourceObject.valueA = null
sourceObject.valueB = B1
sourceObject.valueC = C1

destinationObject.valueA = A2
destinationObject.valueB = null
destinationObject.valueC = C2

beanMerger.map(sourceObject, destinationObject);

这会在我的destinationObject中产生这个值:

destinationObject.valueA: null
destinationObject.valueB: B1
destinationObject.valueC: C1 

我可以配置 BeanMapper 使其不覆盖具有空值的字段吗？我的预期结果应该是:

destinationObject.valueA: A2
destinationObject.valueB: B1
destinationObject.valueC: C1 

甚至更好(不要触及目标对象的设置值)

destinationObject.valueA: A2
destinationObject.valueB: B1
destinationObject.valueC: C2

Answer 1

我找到了解决方案:

beanMerger.addMapping(
  new BeanMappingBuilder() {
    protected void configure() {
       mapping(MyObjectDTO.class, MyObjectDTO.class, TypeMappingOptions.mapNull(false));
    }
  });