主要问题是如何在不破坏的情况下将DTO转换为实体并将实体转换为DtoSOLID原则。例如我们有这样的json:{id:1,name:"user",role:"manager"}DTO是:publicclassUserDto{privateLongid;privateStringname;privateStringroleName;}实体是:publicclassUserEntity{privateLongid;privateStringname;privateRolerole}publicclassRoleEntity{privateLongid;privateStringroleNa

比如我在UserService中有这个方法:@Override@TransactionalpublicUserDtocreate(UserDtouserDto){UserdbUser=userRepository.findOne(userDto.getId());if(dbUser!=null){thrownewAuthException(AuthException.ErrorCode.DUPLICATE_USER_EXCEPTION);}UseroneByLogin=userRepository.findOneByLogin(userDto.getLogin());if(oneByL

如果我们有如下的senario，那么处理null的最佳方式是什么//mockingfordemonstratonstudentsByCourseRoster.setUsers(null);studentsByCourseRoster.getUsers().stream().forEach(user->{finalUserDTOv2userDTO=newUserDTOv2();userDTO.populateUserDataFromUserDTO(user,groupedUsers);users.add(userDTO);}); 最佳答案