/**

     * 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>() {

            @Override

            public 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;

            }

        });

    }