利用java8 stream api 实现List集合分页获取工具

package com.test.paging;

import java.util.Arrays;
import java.util.List;

/**
 * @author kevin.chen
 *         Date 2017/11/9
 *         Time 18:05
 */
public class ListPagingTest {


    public static void main(String[] args) {
        List list = Arrays.asList("ab", "ce", "re", "asf", "saf", "abc", "111");

        PagingList paging = new PagingList<>(list, 2);


        while (paging.hasNext()) {
            paging.next().forEach(System.out::println);
        }


    }


}

自己利用java8 stream api 实现的List集合分页获取工具 分享给大家

 

package com.bestpay.account.core.common;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author kevin.chen
 *         Date 2017/11/9
 *         Time 18:11
 *         对数据集合进分页获取
 */
public class PagingList {

    /**
     * 总页数
     */
    private int totalPage = 0;

    /**
     * 当前是第几页
     */
    private int curPageNo = 0;

    /**
     * 每页的大小
     */
    private int pageSize = 0;

    /**
     * 每页默认大小
     */
    private static final int DEFAULT_PAGE_SIZE = 500;


    private List pageData = null;

    public PagingList(List pageResult, int pageSize) {
        this.pageSize = pageSize;
        this.pageData = pageResult;
        init(pageResult, pageSize);
    }


    public PagingList(List pageResult) {
        this(pageResult, DEFAULT_PAGE_SIZE);
    }


    private void init(List pageResult, int pageSize) {
        if (pageSize <= 0) {
            throw new IllegalArgumentException("Paging size must be greater than zero.");
        }
        if (null == pageResult) {
            throw new NullPointerException("Paging resource list must be not null.");
        }
        if (pageResult.size() % pageSize > 0) {
            this.totalPage = (pageResult.size() / pageSize) + 1;
        } else {
            this.totalPage = pageResult.size() / pageSize;
        }
    }

    /**
     * 返回当前剩余页数
     *
     * @return
     */
    private int getSurplusPage() {
        if (pageData.size() % pageSize > 0) {
            return (pageData.size() / pageSize) + 1;
        } else {
            return pageData.size() / pageSize;
        }

    }

    /**
     * 返回是否还有下一页数据
     *
     * @return
     */
    public boolean hasNext() {
        return pageData.size() > 0;
    }

    /**
     * 获取分页后，总的页数
     *
     * @return
     */
    public int getTotalPage() {
        return totalPage;
    }

    public List next() {
        List pagingData = pageData.stream().limit(pageSize).collect(Collectors.toList());
        pageData = pageData.stream().skip(pageSize).collect(Collectors.toList());
        return pagingData;
    }

    /**
     * 返回当前页数
     *
     * @return
     */
    public int getCurPageNo() {
        return totalPage - getSurplusPage();
    }
}