分页工具类，好用到没朋友

红太狼 2023-10-01 08:22 5阅读 0赞

## 非常好用的分页工具 ##

\#当我们做查询是经常返回一个对象列表，当列表的size比较大的时候经常要用到分页

1.引入依赖到pom文件

<dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.4</version>
        </dependency>

2.引入分页工具类

package com.creaditx.adnetworkbackend.common.utils;  
import com.github.pagehelper.PageHelper;  
import com.github.pagehelper.PageInfo;  
import java.util.LinkedList;  
import java.util.List;

/\*\*

*  自定义List分页工具
 *  
 *  @author lb  
    \*/  
    public class PageUtil \{
    
    public static PageInfo list2PageInfo(List arrayList, Integer pageNum, Integer pageSize) \{  
    //实现list分页  
    PageHelper.startPage(pageNum, pageSize);  
    int pageStart = pageNum == 1 ? 0 : (pageNum - 1) \* pageSize;  
    int pageEnd = arrayList.size() < pageSize \* pageNum ? arrayList.size() : pageSize \* pageNum;  
    List pageResult = new LinkedList();  
    if (arrayList.size() > pageStart) \{  
    pageResult = arrayList.subList(pageStart, pageEnd);  
    \}  
    PageInfo pageInfo = new PageInfo(pageResult);  
    //获取PageInfo其他参数  
    pageInfo.setTotal(arrayList.size());  
    int endRow = pageInfo.getEndRow() == 0 ? 0 : (pageNum - 1) \* pageSize + pageInfo.getEndRow() + 1;  
    pageInfo.setEndRow(endRow);  
    boolean hasNextPage = arrayList.size() <= pageSize \* pageNum ? false : true;  
    pageInfo.setHasNextPage(hasNextPage);  
    boolean hasPreviousPage = pageNum == 1 ? false : true;  
    pageInfo.setHasPreviousPage(hasPreviousPage);  
    pageInfo.setIsFirstPage(!hasPreviousPage);  
    boolean isLastPage = (arrayList.size() > pageSize \* (pageNum - 1) && arrayList.size() <= pageSize \* pageNum) ? true : false;  
    pageInfo.setIsLastPage(isLastPage);  
    int pages = arrayList.size() % pageSize == 0 ? arrayList.size() / pageSize : (arrayList.size() / pageSize) + 1;  
    pageInfo.setNavigateLastPage(pages);  
    int\[\] navigatePageNums = new int\[pages\];  
    for (int i = 1; i < pages; i++) \{  
    navigatePageNums\[i - 1\] = i;  
    \}  
    pageInfo.setNavigatepageNums(navigatePageNums);  
    int nextPage = pageNum < pages ? pageNum + 1 : 0;  
    pageInfo.setNextPage(nextPage);  
    pageInfo.setPageNum(pageNum);  
    pageInfo.setPageSize(pageSize);  
    pageInfo.setPages(pages);  
    pageInfo.setPrePage(pageNum - 1);  
    pageInfo.setSize(pageInfo.getList().size());  
    int starRow = arrayList.size() < pageSize \* pageNum ? 1 + pageSize \* (pageNum - 1) : 0;  
    pageInfo.setStartRow(starRow);  
    return pageInfo;  
    \}  
    \}

3.使用

private RestfulResult<ResponseEntity> getKeywords(KeywordReq keywordReq,Integer index, Integer pageSize) {
            RestfulResult<ResponseEntity> restfulResult = new RestfulResult<>();
            PageInfo<KeywordRes> info  = PageUtil.list2PageInfo(realTimeBoardDatacollectMapper.getKeyword(keywordReq), index, pageSize);
            List<KeywordExcel> KeywordExcels = new ArrayList<>();
            if (CollectionUtils.isNotEmpty(info.getList())) {
                for (KeywordRes keywordRes : info.getList()) {
                    KeywordExcel keywordExcel = new KeywordExcel();
                    BeanUtils.copyProperties(keywordRes, keywordExcel);
                    KeywordExcels.add(keywordExcel);
                }
            }
            ResponseEntity responseEntity = new ResponseEntity();
            responseEntity.setList(KeywordExcels);
            responseEntity.setTotal(info.getTotal());
            restfulResult.setInstall(ResCode.SUCCESS, responseEntity);
            return restfulResult;
        }

好用到没朋友。。。

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5q-P5aSp6L-b5q2l5LiA54K554K577yM5byA5b-D5bCx5Lya5aSa5LiA54K5_size_9_color_FFFFFF_t_70_g_se_x_16]

[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5q-P5aSp6L-b5q2l5LiA54K554K577yM5byA5b-D5bCx5Lya5aSa5LiA54K5_size_9_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/9f5ab254d39a4a18803aaf3c67649bf4.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5q-P5aSp6L-b5q2l5LiA54K554K577yM5byA5b-D5bCx5Lya5aSa5LiA54K5,size_9,color_FFFFFF,t_70,g_se,x_16