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3 years ago
parent
949805d235
commit
e97ae4783a
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package com.hai.common.utils; |
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import com.github.pagehelper.PageInfo; |
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import java.util.List; |
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/** |
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* 分页工具 |
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*/ |
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public class PageUtil { |
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/** |
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* 初始化 |
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* @param currentPage |
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* @param total |
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* @param pageSize |
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* @param pageInfo |
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* @param <T> |
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* @return |
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*/ |
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public static <T> PageInfo<T> initPageInfoObj(int currentPage, int total, int pageSize, PageInfo<T> pageInfo) { |
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List<T> list = pageInfo.getList(); |
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int fromIndex = 0; |
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int toIndex = 0; |
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if (total / pageSize == 0 && total % pageSize > 0) { |
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fromIndex = 0; |
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toIndex = total; |
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} else { |
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if (total / pageSize >= 1 && total % pageSize >= 0) { |
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fromIndex = pageSize * (currentPage - 1); |
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if (pageSize * currentPage >= total) { |
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toIndex = total; |
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} else { |
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toIndex = pageSize * currentPage; |
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} |
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} |
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} |
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try { |
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list = list.subList(fromIndex, toIndex); |
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} catch (IndexOutOfBoundsException e) { |
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fromIndex = 0; |
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toIndex= pageSize; |
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list = list.subList(fromIndex, toIndex); |
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}catch(IllegalArgumentException e) { |
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fromIndex = total-pageSize; |
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toIndex =total; |
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list = list.subList(fromIndex, toIndex); |
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} |
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pageInfo.setList(list); |
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pageInfo.setNextPage(currentPage < ((total + pageSize - 1) / pageSize) ? currentPage + 1 : currentPage); |
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pageInfo.setTotal(total); |
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pageInfo.setPageNum(currentPage); |
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pageInfo.setPages((total + pageSize - 1) / pageSize); |
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pageInfo.setNavigateLastPage((total + pageSize - 1) / pageSize); |
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pageInfo.setPrePage(currentPage > 1 ? currentPage - 1 : currentPage); |
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pageInfo.setIsFirstPage(currentPage == 1 ? true : false); |
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pageInfo.setIsLastPage(currentPage == (total + pageSize - 1) / pageSize ? true : false); |
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pageInfo.setHasPreviousPage(currentPage == 1 ? false : true); |
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pageInfo.setHasNextPage(currentPage == (total + pageSize - 1) / pageSize ? false : true); |
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return calcNavigatepageNums(pageInfo); |
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} |
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private static <T> PageInfo<T> calcNavigatepageNums(PageInfo<T> pageInfo) { |
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// 当总页数小于或等于导航页码数时
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if (pageInfo.getPages() <= pageInfo.getNavigatePages()) { |
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pageInfo.setNavigatepageNums(new int[pageInfo.getPages()]); |
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for (int i = 0; i < pageInfo.getPages(); i++) { |
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pageInfo.getNavigatepageNums()[i] = i + 1; |
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} |
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} else { // 当总页数大于导航页码数时
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pageInfo.setNavigatepageNums(new int[pageInfo.getNavigatePages()]); |
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int startNum = pageInfo.getPageNum() - pageInfo.getNavigatePages() / 2; |
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int endNum = pageInfo.getPageNum() + pageInfo.getNavigatePages() / 2; |
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if (startNum < 1) { |
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startNum = 1; |
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// (最前navigatePages页
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for (int i = 0; i < pageInfo.getNavigatePages(); i++) { |
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pageInfo.getNavigatepageNums()[i] = startNum++; |
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} |
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} else if (endNum > pageInfo.getPages()) { |
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endNum = pageInfo.getPages(); |
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// 最后navigatePages页
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for (int i = pageInfo.getNavigatePages() - 1; i >= 0; i--) { |
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pageInfo.getNavigatepageNums()[i] = endNum--; |
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} |
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} else { |
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// 所有中间页
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for (int i = 0; i < pageInfo.getNavigatePages(); i++) { |
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pageInfo.getNavigatepageNums()[i] = startNum++; |
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} |
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} |
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} |
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return pageInfo; |
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} |
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} |
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