第一步：申请模板获取模板ID： 登录微信公众平台 -> 功能 -> 订阅消息 -> 对里面的模板进行选用或者自定义
公共模板库里面的模板分为一次性订阅 和永久订阅，这个是根据你创建小程序时选择的行业进行区分的。
https://developers./miniprogram/dev/framework/open-ability/subscribe-message.html 官方文档中有详细说明
第二步：消息订阅接口：需要在小程序端调起订阅接口，需要前端完成。官方地址：https://developers./miniprogram/dev/api/open-api/subscribe-message/wx.requestSubscribeMessage.html
第三步：服务端发送消息到服务通知，官方文档：https://developers./miniprogram/dev/api-backend/open-api/subscribe-message/subscribeMessage.send.html
我这里采用的是https的调用方式
代码实现：
核心代码
package com.minapp.management.service;import com.alibaba.fastjson.JSON;import com.fasterxml.jackson.databind.ObjectMapper;import mon.base.Strings;import com.minapp.management.config.WxProperties;import com.minapp.management.entity.dto.AppletTemplateMessageSendDTO;import com.minapp.management.utils.CacheManager;import com.minapp.management.utils.HttpClientUtil;import lombok.Synchronized;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.ponent;import java.io.IOException;import java.util.Map;@Componentpublic class WxAppletRemoteService {private Logger logger = LoggerFactory.getLogger(WxAppletRemoteService.class);private static final String WXAPPLETURl="https://api./cgi-bin";@Autowiredprivate WxProperties properties;@Autowiredprivate ObjectMapper objectMapper;/*** 获取AccessToken* @return*/@Synchronizedpublic String getAccessToken() {String appid=null;String secret=null;// 这里我是从配置文件中取得appid和appsecretappid=properties.getAppId();secret=properties.getAppSecret();//查询token是否存在String key="dowin"+appid+"_AccessToken";// 使用缓存先查询AccessToken是否存在，我这里使用的是本地缓存，如果只是存一个token，本地缓存足以，不需要使用专门缓存的服务，比如reids。String accessToken = CacheManager.getData(key);// 存在直接返回，不存在重新获取AccessTokenif (!Strings.isNullOrEmpty(accessToken)){return accessToken;}// 获取AccessToken的urlString grantType="client_credential";String url=WXAPPLETURl+"/token?grant_type="+grantType+"&appid="+appid+"&secret="+secret;// 获取到AccessTokenString token = HttpClientUtil.get(url);Map<String,Object> map = null;try {map = objectMapper.readValue(token, Map.class);} catch (IOException e) {logger.error("小程序异常通知-获取AccessToken-转化异常",e);}String access_token = String.valueOf(map.get("access_token"));// 把AccessToken存入缓存中，并设置过期时间，因为access_token的过期时间是两小时，我们缓存的时间一定要小于两小时，CacheManager.setData(key,access_token,5000);if (map.get("errcode")!=null || map.get("errmsg")!=null){String errcode = String.valueOf(map.get("errcode"));String errmsg = String.valueOf(map.get("errmsg"));if (!errcode.equals("0")){logger.error("获取token失败：code="+errcode+"msg="+errmsg);return null;}}return access_token;}/*** 同一消息发送接口* AppletTemplateMessageSendDTO 是一个传输类*/public String uniformMessageSend(AppletTemplateMessageSendDTO data) {String token = getAccessToken();// 调用发型接口String url=WXAPPLETURl+"/message/subscribe/send?access_token="+token;String returnData = HttpClientUtil.post(url,JSON.toJSONString(data));Map<String,Object> map = null;try {map = objectMapper.readValue(returnData, Map.class);} catch (IOException e) {logger.error("小程序异常通知-同一消息发送-转化异常",e);}String errcode = String.valueOf(map.get("errcode"));String errmsg = String.valueOf(map.get("errmsg"));if (!errcode.equals("0")){logger.error("消息发送失败：code="+errcode+"msg="+errmsg);}return errcode;}}
传输实体类
package com.minapp.management.entity.dto;import lombok.Data;import java.io.Serializable;//小程序模板消息发送模板@Datapublic class AppletTemplateMessageSendDTO implements Serializable {//接收者（用户）的 openidprivate String touser;//所需下发的订阅模板idprivate String template_id;//所跳转的页面private String page;//模板消息内容private Object data;}
本地缓存类
package com.minapp.management.utils;import java.util.Map;import java.util.concurrent.ConcurrentHashMap;// 本地缓存类public class CacheManager {private static Map<String, CacheData> CACHE_DATA = new ConcurrentHashMap<>();public static <T> T getData(String key, Load<T> load, int expire) {T data = getData(key);if (data == null && load != null) {data = load.load();if (data != null) {setData(key, data, expire);}}return data;}// 根据key获取数据public static <T> T getData(String key) {CacheData<T> data = CACHE_DATA.get(key);if (data != null && (data.getExpire() <= 0 || data.getSaveTime() >= System.currentTimeMillis())) {return data.getData();}return null;}// 存入数据并设置过期时间public static <T> void setData(String key, T data, int expire) {CACHE_DATA.put(key, new CacheData(data, expire));}// 根据key清除数据public static void clear(String key) {CACHE_DATA.remove(key);}// 清除所有缓存数据public static void clearAll() {CACHE_DATA.clear();}public interface Load<T> {T load();}private static class CacheData<T> {CacheData(T t, int expire) {this.data = t;this.expire = expire <= 0 ? 0 : expire * 1000;this.saveTime = System.currentTimeMillis() + this.expire;}private T data;private long saveTime; // 存活时间private long expire; // 过期时间 小于等于0标识永久存活public T getData() {return data;}public long getExpire() {return expire;}public long getSaveTime() {return saveTime;}}}
测试：
AppletTemplateMessageSendDTO appletTemplateMessageSendDTO = new AppletTemplateMessageSendDTO();appletTemplateMessageSendDTO.setTouser("openid");appletTemplateMessageSendDTO.setTemplate_id("模板id");appletTemplateMessageSendDTO.setPage("跳转的页面");Map<String,Object> map = new HashMap<>();Map<String,Object> thing6 = new HashMap<>();Map<String,Object> time8 = new HashMap<>();Map<String,Object> phone_number7 = new HashMap<>();Map<String,Object> thing10 = new HashMap<>();thing6.put("value","xqd");time8.put("value","-12-29");phone_number7.put("value", "17600026666");thing10.put("value","测试一下订阅消息");map.put("thing6",thing6);map.put("time8",time8);map.put("phone_number7",phone_number7);map.put("thing10",thing10);appletTemplateMessageSendDTO.setData(map);wxAppletRemoteService.uniformMessageSend(appletTemplateMessageSendDTO);
发送成功
