46 lines
1.5 KiB
Java
46 lines
1.5 KiB
Java
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package com.engine.organization.util.page;
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import com.github.pagehelper.Page;
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import com.github.pagehelper.PageHelper;
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import org.apache.commons.collections4.CollectionUtils;
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import java.util.Collections;
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import java.util.List;
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public class PageUtil {
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public static void start(Integer pageNum, Integer pageSize) {
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pageNum = pageNum == null || pageNum <= 0 ? 1 : pageNum;
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pageSize = pageSize == null || pageSize <= 0 ? 10 : pageSize;
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PageHelper.startPage(pageNum, pageSize);
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}
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public static <T> Page<T> buildPage(Integer pageNo, Integer pageSize) {
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pageNo = pageNo == null || pageNo <= 0 ? 1 : pageNo;
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pageSize = pageSize == null || pageSize <= 0 ? 10 : pageSize;
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return new Page(pageNo, pageSize, true);
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}
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/**
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* 分页
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*
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* @param pageNo 页码（从1开始）
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* @param pageSize 每页条数
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* @param source 待分页的数据
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* @param <T> 范型制定类
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* @return
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*/
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public static <T> List<T> subList(int pageNo, int pageSize, List<T> source) {
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if (CollectionUtils.isEmpty(source)) {
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return Collections.emptyList();
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}
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int endIndex = pageNo * pageSize;
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int startIndex = (pageNo - 1) * pageSize;
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startIndex = startIndex < 0 ? 0 : startIndex;
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return source.subList(startIndex > source.size() ? source.size() : startIndex,
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endIndex > source.size() ? source.size() : endIndex);
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}
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}
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