/** * 获取列表总页数 */ public static int getListPages(List 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 List subListByPage(List 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 List subListByPosition(List 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 void sortByField(List dtoList,String fieldName,String order) { int compare=1; if ("desc".equals(order)){ compare=-1; } int finalCompare = compare; Collections.sort(dtoList, new Comparator () { @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; } }); }
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