手动分页

 /**
     * pagehelper   手动分页
     * @param currentPage 当前页
     * @param pageSize
     * @param list
     * @param <T>
     * @return
     */
    public static <T> PageInfo<T> getPageInfo(int currentPage, int pageSize, List<T> list) {
        int total = list.size();
        if (total > pageSize) {
            int toIndex = pageSize * currentPage;
            if (toIndex > total) {
                toIndex = total;
            }
            list = list.subList(pageSize * (currentPage - 1), toIndex);
        }
        Page<T> page = new Page<>(currentPage, pageSize);
        page.addAll(list);
        page.setPages((total + pageSize - 1) / pageSize);
        page.setTotal(total);
        PageInfo<T> pageInfo = new PageInfo<>(page);
        return pageInfo;
    }

例子：

    @Test
    public void test1(){
        List<Integer> list = new ArrayList<>();
        for(int i=1;i<31;i++){
            list.add(i);
        }
        System.out.println(list);
        Page<Integer> pageList = getPageList(1, 15, list);
        System.out.println(pageList.getRecords());
    }