Java -- 如何實現後臺分頁

JSONObject filterJsonObj = getPagedResult(allPortList, pageIndex,
					pageCount, searchContext);
List<NetworkDeviceInterfacePojo> portList = (List<NetworkDeviceInterfacePojo>) filterJsonObj
			.get("list");

private JSONObject getPagedResult(
		List<NetworkDeviceInterfacePojo> allPortList, int pageIndex,
		int pageCount, String searchContext) {
	List<NetworkDeviceInterfacePojo> pagedResult = new ArrayList<NetworkDeviceInterfacePojo>();
	List<NetworkDeviceInterfacePojo> searchResult = new ArrayList<NetworkDeviceInterfacePojo>();
	if (!StringUtils.isEmpty(searchContext)) {
		searchContext = searchContext.toUpperCase();
		for (NetworkDeviceInterfacePojo p : allPortList) {
			if (!StringUtils.isEmpty(p.getName())
					&& p.getName().toUpperCase().contains(searchContext)) {
				searchResult.add(p);
			}
		}
	} else {
		searchResult.addAll(allPortList);
	}

	int firstNumber = (pageIndex - 1) * pageCount;
	int lastNumber = pageIndex * pageCount;

	for (int i = 0; i < searchResult.size(); i++) {
		if (i >= firstNumber && i < lastNumber) {
			pagedResult.add(searchResult.get(i));
		}
	}

	JSONObject obj = new JSONObject();
	obj.put("list", pagedResult);
	obj.put("total", searchResult.size());
	return obj;
}