微信小程序怎么获取openid，微信小程序云开发用id获取数据

public class FaJsonUtils { private static ObjectMapper om = new ObjectMapper(); public static String objToString(Object obj) { String result = ""; try { result = om.writeValueAsString(obj); } catch (JsonProcessingException e) { e.printStackTrace(); } return result; } public static <T> T parseObj(String json, Class<T> clazz) { T t = null; if (StringUtils.isNotBlank(json)) { try { t = om.readValue(json.getBytes(), clazz); } catch (IOException e) { e.printStackTrace(); } } return t; }}

Redis 对象转字符串 和 字符串转对象辅助工具类

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由于formId默认有效时间为7天，所以我们第一次默认时间7天，以后没取一次，设置的缓存时间为有效时间的formId剩余时间，

这里存储formId的方式为 LinkedHashMap 有序的插入。

public class AppletFromIdUtil { static final String APPLET_MEMBER_FORM_ID_KEY = "APPLET_MEMBER_FORM_ID_KEY_"; static final Integer APPLET_MEMBER_FORM_ID_TIME = 604800; //缓存默认七天 static Map<String,Long> saveOrupdateFormId(String key, String formId) { Map<String,Long> fromIdMap = FaJsonUtils.parseObj(JedisClient.get(APPLET_MEMBER_FORM_ID_KEY + key), Map.class); if (fromIdMap != null) { if (fromIdMap.get(formId) == null) { fromIdMap.put(formId, System.currentTimeMillis() + APPLET_MEMBER_FORM_ID_TIME * 1000); JedisClient.set(APPLET_MEMBER_FORM_ID_KEY + key, FaJsonUtils.objToString(fromIdMap),APPLET_MEMBER_FORM_ID_TIME); } return fromIdMap; } else { Map<String, Long> map = new LinkedHashMap<>(); map.put(formId, System.currentTimeMillis()+APPLET_MEMBER_FORM_ID_TIME * 1000); JedisClient.set(APPLET_MEMBER_FORM_ID_KEY + "_${_request.memberId}", FaJsonUtils.objToString(map), APPLET_MEMBER_FORM_ID_TIME); return map; } } static String getMemberFormId(String key) { Map<String,Long> fromIdMap = FaJsonUtils.parseObj(JedisClient.get(APPLET_MEMBER_FORM_ID_KEY + key), Map.class); if (fromIdMap != null) { Iterator<Map.Entry<String, Long>> iterator = fromIdMap.entrySet().iterator(); long nowTime = System.currentTimeMillis(); Map.Entry<String, Long> tailFirst = null; List<String> removerKey = new ArrayList<>(); for(Map.Entry<String, Long> entry : iterator){ if( entry.getValue() > nowTime){ tailFirst = entry; break; }else{ removerKey.add(entry.getKey()); } } /** * 清除过期key */ for(String key:removerKey){ fromIdMap.remove(key); } Map.Entry<String, Long> tailLast = null; while (iterator.hasNext()) { tailLast = iterator.next(); } if (tailLast == null || (tailFirst != null && tailLast != null && tailFirst.getKey() == tailLast.getKey())) { JedisClient.del(APPLET_MEMBER_FORM_ID_KEY + key); } else { fromIdMap.remove(tailFirst.getKey()); long time = tailLast.getValue(); if (nowTime > time) { JedisClient.del(APPLET_MEMBER_FORM_ID_KEY + key); } else { long cacheTime = time - nowTime; JedisClient.set(APPLET_MEMBER_FORM_ID_KEY + key, FaJsonUtils.objToString(fromIdMap), (int) cacheTime); } } if (tailFirst != null && tailFirst.getValue() > nowTime) { return tailFirst.getKey(); } return null; } else { return null; } }

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注：?JedisClient 为获取Redis的工具类，这里不详细的介绍。

这里介绍了后台存储和获取formId的方式。这样可以达到变相的为无限制向用户推送模板消息

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