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puhui-go/service/src/main/java/com/hfkj/common/utils/PageUtil.java

107 lines
4.0 KiB

package com.hfkj.common.utils;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageInfo;
import java.util.List;
/**
* 分页工具
*/
public class PageUtil {
/**
* 初始化
* @param currentPage
* @param total
* @param pageSize
* @param pageInfo
* @param <T>
* @return
*/
public static <T> PageInfo<T> initPageInfoObj(int currentPage, int total, int pageSize, PageInfo<T> pageInfo) {
List<T> list = pageInfo.getList();
int fromIndex = 0;
int toIndex = 0;
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;
}
}
}
try {
list = list.subList(fromIndex, toIndex);
} catch (IndexOutOfBoundsException e) {
fromIndex = 0;
toIndex= pageSize;
list = list.subList(fromIndex, toIndex);
}catch(IllegalArgumentException e) {
fromIndex = total-pageSize;
toIndex =total;
list = list.subList(fromIndex, toIndex);
}
pageInfo.setList(list);
pageInfo.setNextPage(currentPage < ((total + pageSize - 1) / pageSize) ? currentPage + 1 : currentPage);
pageInfo.setTotal(total);
pageInfo.setPageNum(currentPage);
pageInfo.setPages((total + pageSize - 1) / pageSize);
pageInfo.setNavigateLastPage((total + pageSize - 1) / pageSize);
pageInfo.setPrePage(currentPage > 1 ? currentPage - 1 : currentPage);
pageInfo.setIsFirstPage(currentPage == 1 ? true : false);
pageInfo.setIsLastPage(currentPage == (total + pageSize - 1) / pageSize ? true : false);
pageInfo.setHasPreviousPage(currentPage == 1 ? false : true);
pageInfo.setHasNextPage(currentPage == (total + pageSize - 1) / pageSize ? false : true);
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;
}
public static <P, V> PageInfo<V> PageInfo2PageInfoVo(PageInfo<P> pageInfoPo) {
// 创建Page对象,实际上是⼀个ArrayList类型的集合
Page<V> page = new Page<>(pageInfoPo.getPageNum(), pageInfoPo.getPageSize());
page.setTotal(pageInfoPo.getTotal());
return new PageInfo<>(page);
}
}