微信公众号开发，获取token，获取公众号粉丝，获取Unionid，发送客户消息

╰+攻爆jí腚メ 2022-05-08 00:36 226阅读 0赞

>     public class WeChatUtil {
>     
>         /**
>          * 获取token
>          */
>         private static String ACCESSTOKENURL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appId}&secret={appSecret}";
>     
>         /**
>          * 获取所有公众号的粉丝
>          */
>         private static String OPENIDLIST = "https://api.weixin.qq.com/cgi-bin/user/get?access_token={token}&next_openid=";
>     
>         /**
>          * 从页面微信授权 过来获取的Unionid
>          */
>         private static String WEBSITINFO = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={appId}&secret={appSecret}&code={code}&grant_type=authorization_code";
>     
>         /**
>          * 发送客服消息
>          */
>         private static String SENDMSG = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=";
>     
>         /**
>          * 获取登陆的token
>          *
>          * @param appId
>          * @param appSecret
>          * @return
>          * @throws Exception
>          */
>         public static String getAccessToken(String appId, String appSecret) {
>             String url = ACCESSTOKENURL.replace("{appId}", appId).replace("{appSecret}", appSecret);
>             RestTemplate restTemplate = new RestTemplate();
>             String result = restTemplate.getForObject(url, String.class);
>             if (StringUtils.isNotBlank(result)) {
>                 return JSONObject.parseObject(result).getString("access_token");
>             }
>             return null;
>         }
>     
>         /**
>          * 获取公众号所有粉丝openID
>          *
>          * @param token
>          * @return
>          */
>         public static List<String> getOpenidList(String token) {
>             String url = OPENIDLIST.replace("{token}", token);
>             RestTemplate restTemplate = new RestTemplate();
>             String result = restTemplate.getForObject(url, String.class);
>             if (StringUtils.isNotBlank(result)) {
>                 JSONObject jsonObject = JSONObject.parseObject(result).getJSONObject("data");
>                 List<String> openids = (List<String>) jsonObject.get("openid");
>                 return openids;
>             }
>             return null;
>         }
>     
>         /**
>          * 根据openid 获取Unionid
>          *
>          * @param token
>          * @param openid
>          * @return
>          */
>         public static String getUnionid(String token, String openid) {
>             String url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=" + token + "&openid=" + openid + "&lang=zh_CN";
>             RestTemplate restTemplate = new RestTemplate();
>             String result = restTemplate.getForObject(url, String.class);
>             if (StringUtils.isNotBlank(result)) {
>                 return JSONObject.parseObject(result).getString("unionid");
>             }
>             return null;
>         }
>     
>         /**
>          * 从页面微信授权 过来获取的Unionid
>          *
>          * @param appId
>          * @param appSecret
>          * @param code
>          * @return
>          */
>         public static String getPageUnionid(String appId, String appSecret, String code) {
>             String url = WEBSITINFO.replace("{appId}", appId).replace("{appSecret}", appSecret).replace("{code}", code);
>             RestTemplate restTemplate = new RestTemplate();
>             String result = restTemplate.getForObject(url, String.class);
>             if (StringUtils.isNotBlank(result)) {
>                 return JSONObject.parseObject(result).getString("unionid");
>             }
>             return null;
>         }
>     
>         public static String sendMsg(String content, String touser, String token) {
>             String url = SENDMSG + token;
>             RestTemplate restTemplate = new RestTemplate();
>             HttpHeaders headers = new HttpHeaders();
>             MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
>             headers.setContentType(type);
>             headers.add("Accept", MediaType.APPLICATION_JSON.toString());
>             StringBuilder sb = new StringBuilder();
>             sb.append("{").append("'touser'").append(":").append("'").append(touser).append("'").append(",").append("'msgtype'").append(":").append("'text'").append(",").append("'text'").append(":");
>             sb.append("{").append("'content'").append(":").append("'").append(content).append("'").append("}").append("}");
>             JSONObject jsonObj = JSONObject.parseObject(sb.toString());
>             HttpEntity<String> formEntity = new HttpEntity<String>(jsonObj.toString(), headers);
>             String result = restTemplate.postForObject(url, formEntity, String.class);
>             if (StringUtils.isNotBlank(result)) {
>                 return result;
>             }
>             return null;
>         }