内存分页-查询条件长list时的分批查询

内存分页代码实现

// pageSize
public static final int PAGE_SIZE = 1000;

public static List<Result> getResultListPaged((List<T> totalList){
	//totalPage 
	int totalPage = totalList .size() / PAGE_SIZE + (totalList .size() % PAGE_SIZE == 0 ? 0 : 1);
	
	List<Result> resultList= new ArrayList<>(totalList.size());
	for (int page = 1; page <= totalPage; page++) {
	    List<T> subList= getListByPage(totalList, page, PAGE_SIZE);
	    if (!CollectionUtils.isEmpty(subList)) {
	        List<ResultList> subResultList= resultService.getResultList(subList);
	        resultList.addAll(subResultList);
	    }
	}
	
	return resultList;
}
	
//分页方法
public static <T> List<T> getListByPage(List<T> totalList , int currentPage, int pageSize) {
	    int startIndex = (currentPage - 1) * pageSize;
	    if (startIndex > totalList .size()) {
	        return Lists.newArrayList();
	    }
	    int endIndex = startIndex + pageSize;
	    if (endIndex > totalList .size()) {
	        endIndex = totalList .size();
	    }
	    return resultList.subList(startIndex, endIndex);
}
	
	`