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107 lines
4.0 KiB
107 lines
4.0 KiB
package com.hfkj.common.utils;
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import com.github.pagehelper.Page;
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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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public static <P, V> PageInfo<V> PageInfo2PageInfoVo(PageInfo<P> pageInfoPo) {
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// 创建Page对象,实际上是⼀个ArrayList类型的集合
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Page<V> page = new Page<>(pageInfoPo.getPageNum(), pageInfoPo.getPageSize());
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page.setTotal(pageInfoPo.getTotal());
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return new PageInfo<>(page);
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}
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}
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