64 lines
1.8 KiB
Java
64 lines
1.8 KiB
Java
/*
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* Copyright 2019-2020 Zheng Jie
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package me.zhengjie.utils;
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import org.springframework.data.domain.Page;
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import java.util.*;
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/**
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* 分页工具
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* @author Zheng Jie
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* @date 2018-12-10
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*/
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public class PageUtil extends cn.hutool.core.util.PageUtil {
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/**
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* List 分页
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*/
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public static <T> List<T> paging(int page, int size , List<T> list) {
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int fromIndex = page * size;
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int toIndex = page * size + size;
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if(fromIndex > list.size()){
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return Collections.emptyList();
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} else if(toIndex >= list.size()) {
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return list.subList(fromIndex,list.size());
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} else {
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return list.subList(fromIndex,toIndex);
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}
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}
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/**
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* Page 数据处理，预防redis反序列化报错
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*/
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public static <T> PageResult<T> toPage(Page<T> page) {
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return new PageResult<>(page.getContent(), page.getTotalElements());
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}
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/**
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* 自定义分页
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*/
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public static <T> PageResult<T> toPage(List<T> list, long totalElements) {
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return new PageResult<>(list, totalElements);
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}
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/**
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* 返回空数据
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*/
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public static <T> PageResult<T> noData () {
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return new PageResult<>(null, 0);
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}
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}
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