Iterator移除元素

本是古典何须时尚 2021-12-11 21:15 415阅读 0赞

### iterator移除元素 ###

> 移除list的某些元素

### demo ###

/** * 搜索 */
    public String search(WhiteScreenSearchRequest request, AccountShort account) { 
            try { 
                String url = api_uri + "/white-screen/search";
                String cid = account.getClientId();
                request.setCid(cid);
    
                boolean wxSearch = request.isWxSearch();
                request.setSource(null);
                String context = GsonUtils.toJson(request);
                Map<String, String> headers = new HashMap<>();
                headers.put("Content-Type", CONTENT_TYPE_JSON);
                headers.put("cid", cid);
                headers.put("token", account.getClientToken());
                String responseBody = HttpRequestUtils.postResult(url, WHITE_SCREEN_API_GATEWAY_TITLE, context, CONTENT_TYPE_JSON, headers);
                if (StringUtils.hasText(responseBody)) { 
                    if (wxSearch) { 
                        /* * 微信小程序搜索 搜索条数超过100条，则只返回100条 */
                        JsonObject response = new JsonParser().parse(responseBody).getAsJsonObject();
                        JsonElement status = response.get("status");
                        if (status != null && status.getAsInt() == 0) { 
                            JsonArray recommendations = response.getAsJsonArray("recommendations");
                            logger.info("white screen search, result size: {}, source: weixin search.", recommendations == null ? 0 : recommendations.size());
                            if (recommendations != null && recommendations.size() > 100) { 
                                // 截取0-100条数据返回给前端
                                Iterator<JsonElement> iterator = recommendations.iterator();
                                int i = 0;
                                while (iterator.hasNext()) { 
                                    iterator.next();//next（）取出元素
                                    if (i >= 100) { 
                                        iterator.remove(); //remove方法会删除使用next()方法返回 的元素
                                    }
                                    i++;
                                }
                            }
                        }
                        return response.toString();
                    }
                    return responseBody;
                }
            } catch (Exception e) { 
                e.printStackTrace();
                logger.info("White screen order search exception [{}]", e);
            }
            return null;
        }