Java 自定義 List 分頁工具

PS: T可修改为对应的实体

rt com.google.common.collect.Lists;

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

/**
 * @ClassName: MyPageHelper
 * @Descripution: List<T>分頁工具
 **/
public class MyPageHelper<T> {

    public List<T> splitList(List<T> list, int page, int pageSize) {
        if (page <= 0) {
            throw new IllegalArgumentException("MyPageHelper error: page number cannot be less than or equal to zero");
        }

        if (pageSize <= 0) {
            throw new IllegalArgumentException("MyPageHelper error: page size cannot be less than or equal to zero");
        }

        int fromIndex = (page - 1) * pageSize;
        if (fromIndex >= list.size()) {
            return Collections.emptyList();
        }

        int toIndex = fromIndex + pageSize;
        if (toIndex > list.size()) {
            toIndex = list.size();
        }

        List<List<T>> partition = Lists.partition(list.subList(fromIndex, toIndex), pageSize);

        return partition.isEmpty() ? null : partition.get(0);
    }
    
    // 測試
    public static void main(String[] args) {
        // 使用方法
        MyPageHelper<Integer> paginationHelper = new MyPageHelper<>();
        List<Integer> fullList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        int page = 3; // 第二頁
        int pageSize = 4; // 每頁3條記錄
        List<Integer> pages = paginationHelper.splitList(fullList, page, pageSize);
        System.out.println(pages);
    }

设置 显示第三页数据，数据条数为4

int page = 3; // 第3頁
int pageSize = 4; // 每頁4條記錄

执行结果：

[9, 10]

END