PageUtil.java
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package com.infoloop.tianting.utils;
import com.infoloop.tianting.model.common.OrderPageResult;
import com.infoloop.tianting.model.common.PageResult;
import com.infoloop.tianting.model.dto.OrderDbDTO.OrderCountByStatusDto;
import java.lang.reflect.InvocationTargetException;
import java.util.LinkedList;
import java.util.List;
public class PageUtil {
public static <T> PageResult<T> buildEmpty(Class<T> clazz) {
T instance;
try {
instance = clazz.getDeclaredConstructor().newInstance();
} catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
throw new RuntimeException(e);
}
return buildEmpty(instance);
}
public static <T> PageResult<T> buildEmpty(T t) {
PageResult<T> pageRet = new PageResult<>();
pageRet.setTotalCount(0);
pageRet.setDataList(List.of(t));
pageRet.setPageNo(0);
pageRet.setPageSize(0);
pageRet.setTotalPage(0);
return pageRet;
}
/**
* 自定义分页
*/
public static <T> PageResult<T> subListPage(List<T> list, int pageNo, int pageSize) {
PageResult<T> pageRet = new PageResult<T>();
//总条数
int count = list.size();
pageRet.setTotalCount(count);
int pages = count % pageSize == 0 ? count / pageSize : (count / pageSize + 1);
int fromIndex = (pageNo - 1) * pageSize;
int toIndex = Math.min(pageNo * pageSize, count);
if (pageNo > pages) {
pageRet.setDataList(new LinkedList<>());
pageRet.setPageNo(pageNo);
pageRet.setPageSize(pageSize);
pageRet.setTotalPage(pages);
return pageRet;
}
List<T> pageList = list.subList(fromIndex, toIndex);
pageRet.setDataList(pageList);
pageRet.setPageNo(pageNo);
pageRet.setPageSize(pageSize);
pageRet.setTotalPage(pages);
return pageRet;
}
public static <T> PageResult<T> from(List<T> list, long totalCount, long pages, int pageNo, int pageSize) {
PageResult<T> pageRet = new PageResult<T>();
pageRet.setTotalCount(totalCount);
pageRet.setDataList(list);
pageRet.setPageNo(pageNo);
pageRet.setPageSize(pageSize);
pageRet.setTotalPage(pages);
return pageRet;
}
public static <T> OrderPageResult<T> from(List<T> list, long totalCount, long pages, int pageNo, int pageSize, OrderCountByStatusDto countByStatus) {
OrderPageResult<T> pageRet = new OrderPageResult<T>();
pageRet.setTotalCount(totalCount);
pageRet.setDataList(list);
pageRet.setPageNo(pageNo);
pageRet.setPageSize(pageSize);
pageRet.setTotalPage(pages);
pageRet.setCountByStatus(countByStatus);
return pageRet;
}
}