| 提交 | 用户 | age | ||
| 812cb5 | 1 | package com.hz.his.util; |
| F | 2 | |
| 3 | import com.github.pagehelper.PageInfo; | |
| 4 | ||
| 5 | import java.util.List; | |
| 6 | ||
| 7 | /** | |
| 8 | * @author fwq | |
| 9 | * PageHelperTool | |
| 10 | * 分页工具类:对查询结果处理后再进行分页 | |
| 11 | */ | |
| 12 | public class PageHelperUtil { | |
| 13 | ||
| 2e6720 | 14 | public static <T> PageInfo<T> pageInfo(Integer currentPage, Integer pageSize, List list) { |
| 812cb5 | 15 | |
| F | 16 | int fromIndex = 0; |
| 17 | int toIndex = 0; | |
| 18 | //取出总记录数 | |
| 19 | int total = list.size(); | |
| 20 | //当前页码 | |
| 2e6720 | 21 | if (currentPage == null || currentPage <= 0) { |
| F | 22 | currentPage = 1; |
| 23 | } | |
| 812cb5 | 24 | //当前页条目数 |
| 2e6720 | 25 | if (pageSize == null || pageSize <= 0 || pageSize > 500) { |
| F | 26 | pageSize = 20; |
| 27 | } | |
| 812cb5 | 28 | |
| F | 29 | if (total / pageSize == 0 && total % pageSize > 0) { |
| 30 | fromIndex = 0; | |
| 31 | toIndex = total; | |
| 32 | } else { | |
| 33 | if (total / pageSize >= 1 && total % pageSize >= 0) { | |
| 34 | fromIndex = pageSize * (currentPage - 1); | |
| 35 | if (pageSize * currentPage >= total) { | |
| 36 | toIndex = total; | |
| 37 | } else { | |
| 38 | toIndex = pageSize * currentPage; | |
| 39 | } | |
| 40 | } | |
| 41 | } | |
| 42 | ||
| 43 | List pageList = list.subList(fromIndex, toIndex); | |
| 44 | PageInfo pageInfo = new PageInfo<>(pageList); | |
| 45 | return initPageInfoObj(currentPage, total, pageSize, pageInfo); | |
| 46 | } | |
| 47 | ||
| 48 | private static <T> PageInfo<T> initPageInfoObj(int currentPage, int total, int pageSize, PageInfo<T> pageInfo) { | |
| 49 | pageInfo.setNextPage(currentPage < ((total + pageSize - 1) / pageSize) ? currentPage + 1 : currentPage); | |
| 50 | pageInfo.setTotal(total); | |
| 51 | pageInfo.setPageNum(currentPage); | |
| 52 | pageInfo.setPages((total + pageSize - 1) / pageSize); | |
| 53 | pageInfo.setPrePage(currentPage > 1 ? currentPage - 1 : currentPage); | |
| 54 | pageInfo.setIsFirstPage(currentPage == 1); | |
| 55 | pageInfo.setIsLastPage(currentPage == (total + pageSize - 1) / pageSize); | |
| 56 | pageInfo.setHasPreviousPage(currentPage != 1); | |
| 57 | pageInfo.setHasNextPage(currentPage != (total + pageSize - 1) / pageSize); | |
| 58 | return calcNavigatepageNums(pageInfo); | |
| 59 | } | |
| 60 | ||
| 61 | private static <T> PageInfo<T> calcNavigatepageNums(PageInfo<T> pageInfo) { | |
| 62 | //当总页数小于或等于导航页码数时 | |
| 63 | if (pageInfo.getPages() <= pageInfo.getNavigatePages()) { | |
| 64 | pageInfo.setNavigatepageNums(new int[pageInfo.getPages()]); | |
| 65 | for (int i = 0; i < pageInfo.getPages(); i++) { | |
| 66 | pageInfo.getNavigatepageNums()[i] = i + 1; | |
| 67 | } | |
| 68 | } else { //当总页数大于导航页码数时 | |
| 69 | pageInfo.setNavigatepageNums(new int[pageInfo.getNavigatePages()]); | |
| 70 | int startNum = pageInfo.getPageNum() - pageInfo.getNavigatePages() / 2; | |
| 71 | int endNum = pageInfo.getPageNum() + pageInfo.getNavigatePages() / 2; | |
| 72 | ||
| 73 | if (startNum < 1) { | |
| 74 | startNum = 1; | |
| 75 | //(最前navigatePages页 | |
| 76 | for (int i = 0; i < pageInfo.getNavigatePages(); i++) { | |
| 77 | pageInfo.getNavigatepageNums()[i] = startNum++; | |
| 78 | } | |
| 79 | } else if (endNum > pageInfo.getPages()) { | |
| 80 | endNum = pageInfo.getPages(); | |
| 81 | //最后navigatePages页 | |
| 82 | for (int i = pageInfo.getNavigatePages() - 1; i >= 0; i--) { | |
| 83 | pageInfo.getNavigatepageNums()[i] = endNum--; | |
| 84 | } | |
| 85 | } else { | |
| 86 | //所有中间页 | |
| 87 | for (int i = 0; i < pageInfo.getNavigatePages(); i++) { | |
| 88 | pageInfo.getNavigatepageNums()[i] = startNum++; | |
| 89 | } | |
| 90 | } | |
| 91 | } | |
| 92 | return pageInfo; | |
| 93 | } | |
| 94 | ||
| 95 | ||
| 96 | } | |
| 97 | ||
