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从集合中取出对象的属性值形成一个新的list List<Long> signStudentIdList = signRecordDtoList.stream().map(SignRecordDto::getSignUserId).collect(Collectors.toList()); 根据属性值分组返回map Map<String, List<TeachActiv......

在工具类中需要在Static方法中引用被@AutoWired修饰的属性，被@AutoWired修饰的属性是null； @Component public class ShowInstanceUtil{ @Autowired private IDataDictWebService DictService; private static IDataDictWebService dat...