简单的Java分页工具

目录

1. 定义page类 

2. PageUtiL类

1. 定义page类 

import java.util.AbstractList;
import java.util.ArrayList;
import java.util.List;


public class Page extends AbstractList {
    private int totalPages;
    private long totalElements;
    private int numberOfElements;
    private int size;
    private int number;
    private List content;

    public Page() {
        this.content = new ArrayList();
    }

    public void setTotalPages(int totalPages) {
        this.totalPages = totalPages;
    }

    public void setTotalElements(long totalElements) {
        this.totalElements = totalElements;
    }

    public void setNumberOfElements(int numberOfElements) {
        this.numberOfElements = numberOfElements;
    }

    public void setSize(int size) {
        this.size = size;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public void setContent(List content) {
        this.content = content;
    }

    public int getTotalPages() {
        return totalPages;
    }

    public long getTotalElements() {
        return totalElements;
    }

    public int getNumberOfElements() {
        return numberOfElements;
    }

    public int getSize() {
        return size;
    }

    public int getNumber() {
        return number;
    }

    public List getContent() {
        return content;
    }

    @Override
    public E get(int index) {
        return this.content.get(index);
    }

    @Override
    public int size() {
        return this.content.size();
    }
}

2. PageUtiL类

import cn.hutool.db.PageResult;
import org.springframework.util.CollectionUtils;

import java.util.List;


public class PageUtil {

    public static  Page pageMethod(List list, PageResult pageRequest) {
        Page result = new Page();
        if (CollectionUtils.isEmpty(list)){
            return result;
        }
        int start = pageRequest.getPage() * pageRequest.getPageSize();
        int end = (pageRequest.getPage() + 1) * pageRequest.getPageSize();
        if (list.size() < end) {
            end = list.size();
        }

        int total = list.size();
        List subList = list.subList(start, end);
        result.setTotalElements((long) total);
        result.setSize(pageRequest.getPageSize());
        result.setNumber(pageRequest.getPage());
        result.setTotalPages((total - 1) / pageRequest.getPageSize() + 1);
        result.setNumberOfElements(subList.size());
        result.setContent(subList);
        return result;
    }
}