给各类xxxToxxx方法造的轮子

后台开发中有不少场景须要将数据库实体，Dto，Vo，Param相互转换，有的只是简单的属性拷贝，有的会在这基础上再作写其余的处理，为了不每次重复开发，使用泛型，开发了一套抽象类抽象共有逻辑

• AbstractBean

  封装泛型类对象，并提供最基本的属性拷贝方法

  class AbstractBean<T> {
    /**
     *  当前泛型真实类型的Class
     */
    private Class<T> modelClass;
  
    AbstractBean() {
        ParameterizedType pt = (ParameterizedType) this.getClass().getGenericSuperclass();
        modelClass = (Class<T>) pt.getActualTypeArguments()[0];
    }
  
    T toOtherBean(){
        try {
            T model = modelClass.newInstance();
            BeanUtils.copyProperties(this,model);
            return model;
        } catch (ReflectiveOperationException e) {
            throw new ServiceException(ResultCode.FAIL,e);
        }
    }
   }
  复制代码

• AbstractModel/AbstractDto/xxx

  基于AbstractBean父类，针对Model和Dto作特殊的泛型限制，并提供模板方法给子类作后续的特殊处理

  public abstract class AbstractParam<T extends AbstractDto> extends AbstractBean<T> {
      public T toDto(){
          return super.toOtherBean();
      }
  }
  复制代码

  public abstract class AbstractDto<T extends IModel> extends AbstractBean<T> {
      public T toModel(){
          return super.toOtherBean();
      }
  
      public T toModel(Consumer<T> consumer){
          T t = super.toOtherBean();
          consumer.accept(t);
          return t;
      }
  }
  复制代码

• 使用方法

  @Data
  public class CustomModel implements AbstractModel {
  
      private Integer id;
      private String name;
      private String idConcatName;
  }
  复制代码

  @Data
  public class CustomDto extends AbstractDto<CustomModel> {
      private Integer id;
      private String name;
  }
  复制代码

  @Data
  public class CustomParam extends AbstractParam<CustomDto> {
      private Integer id;
      private String name;
  }
  复制代码

  public class Test{
      public static void main(String[] args) {
            CustomParam customParam = new CustomParam();
            customParam.setId(1);
            customParam.setName("gwf");
            CustomDto customDto = customParam.toDto();
            System.out.println(JSON.toJSONString(customDto));  // 输出 {"id":1,"name":"gwf"}
  
            CustomModel iModel = customDto.toModel(model -> model.setIdConcatName(model.getId()+":"+model.getName()));
            System.out.println(JSON.toJSONString(iModel)); // 输出 {"id":1,"idConcatName":"1:gwf","name":"gwf"}
        }
  }
  复制代码