New file |
| | |
| | | package com.hz.his.util; |
| | | |
| | | import com.github.pagehelper.PageInfo; |
| | | |
| | | import java.util.List; |
| | | |
| | | /** |
| | | * @author fwq |
| | | * PageHelperTool |
| | | * 分页工具类:对查询结果处理后再进行分页 |
| | | */ |
| | | public class PageHelperUtil { |
| | | |
| | | public static <T> PageInfo<T> pageInfo(int currentPage, int pageSize, List list) { |
| | | |
| | | int fromIndex = 0; |
| | | int toIndex = 0; |
| | | //取出总记录数 |
| | | int total = list.size(); |
| | | //当前页码 |
| | | currentPage = (currentPage <= 0) ? 1 : currentPage; |
| | | //当前页条目数 |
| | | pageSize = (pageSize <= 0) ? 10 : (Math.min(pageSize, total)); |
| | | |
| | | if (total / pageSize == 0 && total % pageSize > 0) { |
| | | fromIndex = 0; |
| | | toIndex = total; |
| | | } else { |
| | | if (total / pageSize >= 1 && total % pageSize >= 0) { |
| | | fromIndex = pageSize * (currentPage - 1); |
| | | if (pageSize * currentPage >= total) { |
| | | toIndex = total; |
| | | } else { |
| | | toIndex = pageSize * currentPage; |
| | | } |
| | | } |
| | | } |
| | | |
| | | List pageList = list.subList(fromIndex, toIndex); |
| | | PageInfo pageInfo = new PageInfo<>(pageList); |
| | | return initPageInfoObj(currentPage, total, pageSize, pageInfo); |
| | | } |
| | | |
| | | private static <T> PageInfo<T> initPageInfoObj(int currentPage, int total, int pageSize, PageInfo<T> pageInfo) { |
| | | pageInfo.setNextPage(currentPage < ((total + pageSize - 1) / pageSize) ? currentPage + 1 : currentPage); |
| | | pageInfo.setTotal(total); |
| | | pageInfo.setPageNum(currentPage); |
| | | pageInfo.setPages((total + pageSize - 1) / pageSize); |
| | | pageInfo.setPrePage(currentPage > 1 ? currentPage - 1 : currentPage); |
| | | pageInfo.setIsFirstPage(currentPage == 1); |
| | | pageInfo.setIsLastPage(currentPage == (total + pageSize - 1) / pageSize); |
| | | pageInfo.setHasPreviousPage(currentPage != 1); |
| | | pageInfo.setHasNextPage(currentPage != (total + pageSize - 1) / pageSize); |
| | | return calcNavigatepageNums(pageInfo); |
| | | } |
| | | |
| | | private static <T> PageInfo<T> calcNavigatepageNums(PageInfo<T> pageInfo) { |
| | | //当总页数小于或等于导航页码数时 |
| | | if (pageInfo.getPages() <= pageInfo.getNavigatePages()) { |
| | | pageInfo.setNavigatepageNums(new int[pageInfo.getPages()]); |
| | | for (int i = 0; i < pageInfo.getPages(); i++) { |
| | | pageInfo.getNavigatepageNums()[i] = i + 1; |
| | | } |
| | | } else { //当总页数大于导航页码数时 |
| | | pageInfo.setNavigatepageNums(new int[pageInfo.getNavigatePages()]); |
| | | int startNum = pageInfo.getPageNum() - pageInfo.getNavigatePages() / 2; |
| | | int endNum = pageInfo.getPageNum() + pageInfo.getNavigatePages() / 2; |
| | | |
| | | if (startNum < 1) { |
| | | startNum = 1; |
| | | //(最前navigatePages页 |
| | | for (int i = 0; i < pageInfo.getNavigatePages(); i++) { |
| | | pageInfo.getNavigatepageNums()[i] = startNum++; |
| | | } |
| | | } else if (endNum > pageInfo.getPages()) { |
| | | endNum = pageInfo.getPages(); |
| | | //最后navigatePages页 |
| | | for (int i = pageInfo.getNavigatePages() - 1; i >= 0; i--) { |
| | | pageInfo.getNavigatepageNums()[i] = endNum--; |
| | | } |
| | | } else { |
| | | //所有中间页 |
| | | for (int i = 0; i < pageInfo.getNavigatePages(); i++) { |
| | | pageInfo.getNavigatepageNums()[i] = startNum++; |
| | | } |
| | | } |
| | | } |
| | | return pageInfo; |
| | | } |
| | | |
| | | |
| | | } |
| | | |