/*** 获取列表总页数*/public static <T> int getListPages(List<T> list,int pageNum,int pageSize ){if (isNull(list)){return 0;}BaseQuery baseQuery=new BaseQuery();baseQuery.setPageNum(pageNum);baseQuery.setPageSize(pageSize);//list的大小int total = list.size();baseQuery.setTotal(total);return baseQuery.getPages();}/*** 对列表进行分页,索引左边包括，右边不包括*/public static <T> List<T> subListByPage(List<T> list,int pageNum,int pageSize ){if (isNull(list)){return Collections.emptyList();}BaseQuery baseQuery=new BaseQuery();baseQuery.setPageNum(pageNum);baseQuery.setPageSize(pageSize);//list的大小int total = list.size();//对list进行截取return list.subList(baseQuery.getStartPosition(),total-baseQuery.getStartPosition()>baseQuery.getPageSize()?baseQuery.getStartPosition()+baseQuery.getPageSize():total);}/*** 对列表进行索引截取,索引左边包括，右边不包括*/public static <T> List<T> subListByPosition(List<T> list,BaseQuery baseQuery){if (isNull(list)){baseQuery.setTotal(0);return Collections.emptyList();}//设置列表总条数int total = list.size();baseQuery.setTotal(total);if ((baseQuery.getStartIndex()-1)>=total){return Collections.emptyList();}//对list进行截取return list.subList(baseQuery.getStartIndex()-1,baseQuery.getEndIndex()>total?total:baseQuery.getEndIndex());}/***对列表字段进行比较排序*/public static <T> void sortByField(List<T> dtoList,String fieldName,String order) {int compare=1;if ("desc".equals(order)){compare=-1;}int finalCompare = compare;Collections.sort(dtoList, new Comparator<T>() {@Overridepublic int compare(T o1, T o2) {PropertyDescriptor pd1 = null;PropertyDescriptor pd2 = null;Object value1 =null;Object value2 =null;try {pd1 = new PropertyDescriptor(fieldName, o1.getClass());value1 = pd1.getReadMethod().invoke(o1, null);pd2 = new PropertyDescriptor(fieldName, o2.getClass());value2 = pd2.getReadMethod().invoke(o2, null);} catch (IntrospectionException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}if (value1.getClass().equals(Double.class)){System.out.println(2);if ((Double)value1 > (Double)value2) {return finalCompare;} else if ((Double)value1 < (Double)value2) {return -finalCompare;}}else if (value1.getClass().equals(Integer.class)){System.out.println(4);if ((Integer)value1 > (Integer)value2) {return finalCompare;} else if ((Integer)value1 < (Integer)value2) {return -finalCompare;}}return 0;}});}